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Bumblebee (?) identification

Bumblebee (?) identification



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These bumblebees live on my balcony, in ventilation holes in doors and windows. I'm trying to find the exact name of the species, but I can't find any that look exactly like this. Their top segment is completely black and the bottom one is completely orange. I'm not 100% sure that these are bumblebees, but they behave like bumblebees, I mean, they fly horizontally and like nectar.

The location is in the southern part of Germany (Bavaria). The insects are ~20mm long, similar to the size of a honey bee.

The closest match is probably Bombus lapidarius, but Bombus lapidarius only have orange "tails", most of their bottom half is black.

It looks very similar or even identical to Bombus alpinus, but the problem here is that Bombus alpinus usually live in the mountains (and I'm in 300km from the closest mountains) and they are considered to be almost extinct in Germany.

Do you have any idea what they are called?


The animal in the photos is actually a female of Osmia cornuta. The horns are quite visible, which makes us exclude Osmia bicolor, and the thorax is entirely covered with black hair, which makes us exclude Osmia bicornis.


Your pictures are quite blurry, but I think this is an Osmia, ie a Mason bee (and not a bumble bee). I think you can see a tendency of the “horns” that female Osmia bicornis (red mason bee) have on their heads on your pictures, so this is my guess. Females are much larger and generally darker than males on the thorax and head, and often quite black there while overall red on the abdomen. Another option is O. bicolour, where females lack the “horns”of bicornis.

See eg this picture:

Head picture of female O. bicornis, to see the “horns” clearly (if it is indeed this species):
(Pictures from artportalen.se)

Another possible species in the same genus is Osmia bicolor (two-coloured mason-bee), which is more clearly divided in black-orange, see e.g.:

This species has an interesting biology, in that it is specialized on using snail shells for egglaying and preparing larval cells stored with food.


Genome sequencing reveals a new species of bumblebee

The newly discovered Bombus incognitus looks identical to another species, Bombus sylvicola. It is impossible to say which one of the two is seen in this photo. Credit: Jennifer Geib

While studying genetic diversity in bumblebees in the Rocky Mountains, U.S., researchers from Uppsala University discovered a new species. They named it Bombus incognitus and present their findings in the journal Molecular Biology and Evolution.

Bumblebees are vital for agriculture and the natural world due to their role in plant pollination. There are more than 250 species of bumblebee, and they are found mainly in northern temperate regions of the planet. Alarmingly, many species are declining due to the effects of climate change, and those with alpine and arctic habitats are particularly threatened. However, the full diversity of bumblebee species in these environments is still unknown.

The newly discovered Bombus incognitus looks identical to another species, Bombus sylvicola. It is impossible to say which one of the two is seen in this photo. Credit: Jennifer Geib

Matthew Webster's research group at Uppsala University, together with colleagues in the U.S., studied genetic diversity in bumblebees in the Rocky Mountains, Colorado by collecting hundreds of samples and sequencing their genomes. Surprisingly, the data revealed the presence of a new species, which was indistinguishable in appearance to the species Bombus sylvicola, but clearly distinct at the genetic level. The authors named this species Bombus incognitus.

By comparing the genomes of Bombus sylvicola and Bombus incognitus, the team were able to learn about how this new species formed. They found signals consistent with gene flow between the species during their evolution. They also identified parts of chromosomes that are incompatible between species, which act as genetic barriers to gene flow and were likely important in causing the species to separate.

The newly discovered Bombus incognitus looks identical to another species, Bombus sylvicola. It is impossible to say which one of the two is seen in this photo. Credit: Jennifer Geib

These results indicate that the number of bumblebee species in arctic and alpine environments may be larger than previously thought. It is possible that mountainous terrain is conducive to speciation. Cold-adapted populations could become isolated at high altitudes during periods of warming in their evolutionary history, leading to the formation of new species. It is also possible that additional genome sequencing of bumblebees will reveal even more cryptic species that have so far gone undetected.


Bumble Bees Identification and Biology

Behavior

Bumble bees are social insects and live in nests or colonies with other bumble bees. You may have noticed them in large numbers during the late summer months especially, when they are busy collecting pollen. In their nests, bumble bees produce both wax and honey (this honey is not considered edible like that of the honey bee). Bumble bees will naturally die off or disappear underground to overwinter (or hibernate) when colder weather arrives.


Habitat

Some common locations of bumble bee nests are: vacant rodent burrows under piles of debris such as stones, leaves, logs, or grass clippings and occasionally above ground in a shed, wall, attic, or crawl space. A mature bumble bee nest contains about 50 to 400 adult bees.


Damage

Bumblebees are relatively harmless when left alone and are naturally beneficial in the pollination of flowering plants. If disturbed, the bumble bee will likely sting, and may do so more than once. Bumble bees nesting too close to a home or recreational area should be removed or controlled, especially when children or people sensitive to bee venom are present.


Basic Bumble Bee Control Methods

1.) Prevent nest establishment by filling animal holes or burrows with dirt

2.) Keep bees outside of structures by repairing any holes in the exterior wall and making sure that all vents and windows have tight-fitting screens.

3.) Try to locate the nest by watching bees during the day and taking note of where they disappear into the landscape or structure. Then at night, wearing a bee veil and other protective clothing, apply D-Force HPX aerosol directly to the nest.

4.) Delta Dust Insecticide also works well and provides excellent coverage when applied in and around the nest. Delta Dust lasts 4 to 6 months and will result in a quick kill. Apply dust liberally using a hand duster (for easier application) and repeat in 3 to 4 months to control for newly hatched bees.

5.) Nests located inside the structure are best treated with Delta Dust. Be sure to leave the entrance open until the beginning of fall when hatching is sure to be completed. Then the entrance may be sealed to prevent further nest establishment.

View all Bee Control Products

For more detailed information on Bumble Bee prevention and control, see How To Get Rid of Bumble Bees.


Nest Locations

Bumble bees are known as “cavity” nesting bees – a sort of catch all category for nesting habits that encompasses areas like tussocky grass, cavities in rock/talus, and even rodent borrows. Truthfully, we still do not know much about the nesting habits of many bumble bee species, including the criteria they use to select their nests, where they tend to be located, and the success rate of founding queens.

Occasionally, we find nests near woodland edges where there also tends to be a lot of fallen timber and rodent borrows. When the first bumble bees emerge in the late spring, you can observe nest searching behavior of new queens. Look for them flying low over the ground, stopping occasionally to explore cavities and borrows. Occasionally, they’ll disappear underground for several minutes only to resurface having decided the caverns below were unsuitable for their nest.


Bumblebees

They differ from carpenter bees, which have a solid black, shiny and hairless abdomen.

How Did I Get Bumblebees?

Bumblebee queens overwinter in the ground and when spring arrives, they emerge to begin forming new nest sites. Favored locations for nests are empty animal burrows and mouse nests near sources of food. Bumblebees depend on nectar and pollen, so they thrive in yards and gardens with plenty of flowers and other nectar producing plants.

How Serious Are Bumblebees?

Bumblebees are not as aggressive and likely to sting as are hornets and yellowjackets. Males cannot sting, and females only do so when they feel threatened. Their stings, however, are painful and could be dangerous to those with allergies. In addition, unlike honeybees, bumblebees are capable of stinging multiple times.

How Do I Get Rid of Bumblebees?

There may be times when it is necessary to use measures to control bumblebees. If so, control basically involves both proactive, preventive measures as well as the use of insecticides as the last resort. Some prevention and control measures that work well include:

  • An inspection and management plan prepared by your pest management professional. Always seek out the advice and assistance of your pest management professional before deciding to destroy a bumblebee nest. If control is necessary, your pest management professional will have the proper safety and control equipment to get the job done effectively and efficiently.
  • Sealing holes, cracks and gaps in structures so bumblebees are not able to build a nest in voids or other structure related locations. Sometimes, but not often, a new queen will use an old nest site to begin her new nest. Simply sealing the opening to the old nest will help prevent reuse.
  • Taking precautions to avoid locations that are close to the nest.
  • Using insecticide dusts or liquid sprays. Dust formulations applied at the nest entrance typically work best. While the nest opening should be sealed, wait until you do not see any bumblebees entering or exiting the nest.

The Orkin Man™ is trained to help manage bees of all kinds. Since every home or property is different, the Orkin technician will design a unique program for your situation.

Signs of Bumblebees

The presence of bumblebees usually involves actually seeing adults foraging for pollen and nectar among flowering plants on the property. Also, one might see bumblebee workers coming and going around the entrance into the nest site while sometimes gardeners who are working in the soil in late winter or very early spring may uncover overwintering queens.

Behavior, Diet & Habits

While various bumblebee species may choose different nest sites, they usually build their nest in dry, protected and hidden cavities either below ground, on the ground or close to the ground level. Typical places for bumblebee nests are abandoned rodent tunnels, behind structure siding where gaps and cracks allow entrance, under piles of wood on the ground, under piles of dead leaves and compost piles or even abandoned birds’ nests. The bumblebee queen that has overwintered in a protected location constructs the nest in the early spring and begins the new bumblebee colony.

Nests Bumblebee nests typically contain far fewer members than honeybee nests and usually number from 50 to about 400 individuals. The population size varies by the bumblebee species and environmental conditions. Bumblebee workers only live for about a month and spend most of their time foraging for plant nectar and pollen – their main source of food and the source of nutrition for immature members of the nest. Unlike carpenter bees, a species that property owners often confuse with bumblebees, they do not damage wood or other structural components.

Reproduction & Life Cycle

The bumblebee goes through a complete metamorphosis and includes eggs, larvae (grub), pupae and adults. A fertile female queen that has successfully survived the cold weather months in a protected location starts a new nest in the early spring months. Only the fertile queens that mated the previous year survive and thus bumblebee nests are begun anew each year. The queens begin the new nest by locating a suitable nest location, constructing the nest and laying eggs that will mature into adults that become the first generation of offspring. Also, the queen leaves the nest to gather pollen and nectar that she uses to feed to the larval (grub) stage members of her nest.

As the first generation completes their development into winged adults, these nest members called workers will assume the duties of nest maintenance, construction and collecting pollen and nectar to feed the nest members. At this stage the queen’s role is to continue producing and laying eggs since she is no longer responsible for food gathering and nest enlargement. As the size of the nest increases, toward the mid- to late-summer months the queen will also lay eggs that will become reproductive males and females rather than infertile workers.

The next major event in the life of the nest is when reproductive males and females mate and the fertile females then depart to find a suitable overwintering site where they will live prior to beginning a new nest the following spring. Bumblebees do not swarm like honeybees, but adult, male bumblebees may hover outside a nest as they wait for the reproductive females to emerge, so they can mate.

More Information

Some people report seeing "black bumblebees." However, black bumblebee is not a common name that is approved and registered by the Entomological Society of America. Black bumblebee is likely a colloquial name that is incorrectly used to describe carpenter bees, black wasps or perhaps the black-tailed bumble bee (Bombus melanopygus) that occurs in the humid areas of the Pacific Northwest.

Bumblebees, unlike yellow jackets and hornets, are not overly aggressive stinging insects. In fact, bumblebees rarely sting unless touched or their nest is threatened or disturbed. Therefore, if a bumblebee nest is discovered on your property, just leave it alone unless there is a good chance that your activities will take place near the nest. Foraging bumblebees will almost never take the time out of their busy day to intentionally sting someone or their pets. A few other reasons to accommodate a bumblebee nest is the their huge value as pollinators, the small size of their nest and short life when compared to other stinging insects such as yellow jackets and hornets.


Contents

The word "bumblebee" is a compound of "bumble" and "bee"—'bumble' meaning to hum, buzz, drone, or move ineptly or flounderingly. [1] The generic name Bombus, assigned by Pierre André Latreille in 1802, is derived from the Latin word for a buzzing or humming sound, borrowed from Ancient Greek βόμβος (bómbos). [2]

According to the Oxford English Dictionary (OED), the term "bumblebee" was first recorded as having been used in the English language in the 1530 work Lesclarcissement by John Palsgrave, "I bomme, as a bombyll bee dothe." [3] However the OED also states that the term "humblebee" predates it, having first been used in 1450 in Fysshynge wyth Angle, "In Juyll the greshop & the humbylbee in the medow." [4] The latter term was used in A Midsummer Night's Dream (c. 1600 ) by William Shakespeare, "The honie-bags steale from the humble Bees." [5] Similar terms are used in other Germanic languages, such as the German Hummel (Old High German humbala), [6] Dutch hommel or Swedish humla.

An old provincial name, "dumbledor", also denoted a buzzing insect such as a bumblebee or cockchafer, "dumble" probably imitating the sound of these insects, while "dor" meant "beetle". [7]

In On the Origin of Species (1859), Charles Darwin speculated about "humble-bees" and their interactions with other species: [8]

I have [. ] reason to believe that humble-bees are indispensable to the fertilisation of the heartsease (Viola tricolor), for other bees do not visit this flower. From experiments which I have tried, I have found that the visits of bees, if not indispensable, are at least highly beneficial to the fertilisation of our clovers but humble-bees alone visit the common red clover (Trifolium pratense), as other bees cannot reach the nectar.

However, "bumblebee" remained in use, for example in The Tale of Mrs. Tittlemouse (1910) by Beatrix Potter, "Suddenly round a corner, she met Babbitty Bumble--"Zizz, Bizz, Bizzz!" said the bumble bee." Since World War II "humblebee" has fallen into near-total disuse. [9]

The bumblebee tribe Bombini is one of four groups of corbiculate bees (those with pollen baskets) in the Apidae, the others being the Apini (honey bees), Euglossini (orchid bees), and Meliponini (stingless bees). The corbiculate bees are a monophyletic group. Advanced eusocial behaviour appears to have evolved twice in the group, giving rise to controversy, now largely settled, as to the phylogenetic origins of the four tribes it had been supposed that eusocial behaviour had evolved only once, requiring the Apini to be close to the Meliponini, which they do not resemble. It is now thought that the Apini (with advanced societies) and Euglossini are closely related, while the primitively eusocial Bombini are close to the Meliponini, which have somewhat more advanced eusocial behaviour. Sophie Cardinal and Bryan Danforth comment that "While remarkable, a hypothesis of dual origins of advanced eusociality is congruent with early studies on corbiculate morphology and social behavior." [10] Their analysis, combining molecular, morphological and behavioural data, gives the following cladogram: [10]

On this hypothesis, the molecular data suggest that the Bombini are 25 to 40 million years old, while the Meliponini (and thus the clade that includes the Bombini and Meliponini) are 81 to 96 million years old, about the same age as the corbiculate group. [10]

However, a more recent phylogeny using transcriptome data from 3,647 genes of ten corbiculate bee species supports the single origin of eusociality hypothesis in the corbiculate bees. [11] They find that Bombini is in fact sister to Meliponini, corroborating that previous finding from Sophie Cardinal and Bryan Danforth (2011). However, Romiguier et al. (2015) shows that Bombini, Meliponini, and Apini form a monophyletic group, where Apini shares a most recent common ancestor with the Bombini and Meliponini clade, while Euglossini is most distantly related to all three, since it does not share the same most recent common ancestor as Bombini, Meliponini, and Apini. Thus, their analysis supports the single origin of eusociality hypothesis within the corbiculate bees, where eusociality evolved in the common ancestor of Bombini, Apini, and Meliponini.

The fossil record for bees is incomplete. Around 11 specimens that might possibly be Bombini, some poorly documented, had been described by 2011 some (such as Calyptapis florissantensis from Florissant, USA, and Oligoapis beskonakensis from Beskonak, Turkey) dated from the Oligocene. [12] In 2012 a fossil bumblebee, Bombus (Bombus) randeckensis was described from the Miocene Randeck Maar in southwestern Germany and confidently placed in the subgenus Bombus. [12] In 2014, another species, Bombus cerdanyensis, was described from Late Miocene lacustrine beds of La Cerdanya, Spain, but not placed into any subgenus, [13] while a new genus and species, Oligobombus cuspidatus was described from the late Eocene Bembridge Marls of the Isle of Wight. [14] [15] The species Bombus trophonius was described in October 2017 and placed in Bombus subgenus Cullumanobombus. [16]

The genus Bombus, the only one extant genus in the tribe Bombini, comprises over 250 species [17] for an overview of the differences between bumblebees and other bees and wasps, see characteristics of common wasps and bees. The genus has been divided variously into up to 49 subgenera, a degree of complexity criticised by Williams (2008). [18] The cuckoo bumblebees Psithyrus have sometimes been treated as a separate genus but are now considered to be part of Bombus, in one or more subgenera. [18]

Bumblebees vary in appearance, but are generally plump and densely furry. They are larger, broader and stouter-bodied than honeybees, and their abdomen tip is more rounded. Many species have broad bands of colour, the patterns helping to distinguish different species. Whereas honeybees have short tongues and therefore mainly pollinate open flowers, some bumblebee species have long tongues and collect nectar from flowers that are closed into a tube. [19] Bumblebees have fewer stripes (or none), and usually have part of the body covered in black fur, while honeybees have many stripes including several grey stripes on the abdomen. [20] Sizes are very variable even within species the largest British species, B. terrestris, has queens up to 22 mm (0.9 in) long, males up to 16 mm (0.6 in) long, and workers between 11 and 17 mm (0.4–0.7 in) long. [21] The largest bumblebee species in the world is B. dahlbomii of Chile, up to about 40 mm (1.6 in) long, and described as "flying mice" and "a monstrous fluffy ginger beast". [22]

Bumblebees are typically found in temperate climates, and are often found at higher latitudes and altitudes than other bees, although a few lowland tropical species exist. [23] A few species (B. polaris and B. alpinus) range into very cold climates where other bees might not be found B. polaris occurs in northern Ellesmere Island in the high Arctic, along with another bumblebee B. hyperboreus, which parasitises its nest. This is the northernmost occurrence of any eusocial insect. [24] One reason for their presence in cold places is that bumblebees can regulate their body temperature, via solar radiation, internal mechanisms of "shivering" and radiative cooling from the abdomen (called heterothermy). Other bees have similar physiology, but the mechanisms seem best developed and have been most studied in bumblebees. [25] They adapt to higher elevations by extending their wing stroke amplitude. [26] Bumblebees have a largely cosmopolitan distribution but are absent from Australia (apart from Tasmania where they have been introduced) and are found in Africa only north of the Sahara. [27] More than a hundred years ago they were also introduced to New Zealand, where they play an important role as efficient pollinators. [ citation needed ]

Feeding

The bumblebee tongue (the proboscis) is a long, hairy structure that extends from a sheath-like modified maxilla. The primary action of the tongue is lapping, that is, repeated dipping of the tongue into liquid. [28] The tip of the tongue probably acts as a suction cup and during lapping, nectar may be drawn up the proboscis by capillary action. When at rest or flying, the proboscis is kept folded under the head. The longer the tongue, the deeper the bumblebee can probe into a flower and bees probably learn from experience which flower source is best-suited to their tongue length. [29] Bees with shorter proboscides, like Bombus bifarius, have a more difficult time foraging nectar relative to other bumblebees with longer proboscides to overcome this disadvantage, B. bifarius workers were observed to lick the back of spurs on the nectar duct, which resulted in a small reward. [30]

Wax production

The exoskeleton of the abdomen is divided into plates called dorsal tergites and ventral sternites. Wax is secreted from glands on the abdomen and extruded between the sternites where it resembles flakes of dandruff. It is secreted by the queen when she starts a nest and by young workers. It is scraped from the abdomen by the legs, moulded until malleable and used in the construction of honeypots, to cover the eggs, to line empty cocoons for use as storage containers and sometimes to cover the exterior of the nest. [31]

Coloration

The brightly coloured pile of the bumblebee is an aposematic (warning) signal, given that females can inflict a painful sting. Depending on the species and morph, the warning colours range from entirely black, to bright yellow, red, orange, white, and pink. [32] Dipteran flies in the families Syrphidae (hoverflies), Asilidae (robber flies), Tabanidae (horseflies), Oestridae (bot or warble flies) and Bombyliidae (bee flies, such as Bombylius major) all include Batesian mimics of bumblebees, resembling them closely enough to deceive at least some predators. [33]

Many species of Bombus, including the group sometimes called Psithyrus (cuckoo bumblebees), have evolved Müllerian mimicry, where the different bumblebees in a region resemble each other, so that a young predator need only learn to avoid any of them once. For example, in California a group of bumblebees consists of largely black species including B. californicus, B. caliginosus, B. vandykei, B. vosnesenskii, B. insularis and B. fernaldae. Other bees in California include a group of species all banded black and yellow. In each case, Müllerian mimicry provides the bees in the group with a selective advantage. [33] In addition, parasitic (cuckoo) bumblebees resemble their hosts more closely than would be expected by chance, at least in areas like Europe where parasite-host co-speciation is common but this too may be explained as Müllerian mimicry, rather than requiring the parasite's coloration to deceive the host (aggressive mimicry). [34]

Temperature control

Bumblebees are active under conditions during which honeybees stay at home, and can readily absorb heat from even weak sunshine. [35] The thick pile created by long setae (bristles) acts as insulation to keep bumblebees warm in cold weather species from cold climates have longer setae (and thus thicker insulation) than those from the tropics. [36] The temperature of the flight muscles, which occupy much of the thorax, needs to be at least 30 °C (86 °F) before flight can take place. The muscle temperature can be raised by shivering. It takes about five minutes for the muscles to reach this temperature at an air temperature of 13 °C (55 °F). [37]

Chill-coma temperature

The chill-coma temperature in relation to flying insects is the temperature at which flight muscles cannot be activated. Compared to honey bees and carpenter bees, bumblebees have the lowest chill-coma temperature. Of the bumblebees Bombus bimaculatus has the lowest at 7 °C (45 °F). However, bumblebees have been seen to fly in colder ambient temperatures. This discrepancy is likely because the chill-coma temperature was determined by tests done in a laboratory setting. However, bumblebees live in insulated shelters and can shiver to warm up before venturing into the cold. [38]

Communication and social learning

Bumblebees do not have ears, and it is not known whether or how well they can hear. However, they are sensitive to the vibrations made by sound travelling through wood or other materials. [31]

Bumblebees do not exhibit the "bee dances" used by honeybees to tell other workers the locations of food sources. Instead, when they return from a successful foraging expedition, they run excitedly around in the nest for several minutes before going out to forage once more. These bees may be offering some form of communication based on the buzzing sounds made by their wings, which may stimulate other bees to start foraging. [39] Another stimulant to foraging activity is the level of food reserves in the colony. Bees monitor the amount of honey in the honeypots, and when little is left or when high quality food is added, they are more likely to go out to forage. [40]

Bumblebees have been observed to partake in social learning. In a 2017 study involving Bombus terrestris, bees were taught to complete an unnatural task of moving large objects to obtain a reward. Bees that first observed another bee complete the task were significantly more successful in learning the task than bees that observed the same action performed by a magnet, indicating the importance of social information. The bees did not copy each other exactly: in fact, the study suggested that the bees were instead attempting to emulate each other's goals. [41] [42]

Reproduction and nesting

Nest size depends on species of bumblebee. Most form colonies of between 50 and 400 individuals, [43] but colonies have been documented as small as

20 individuals and as large as 1700. [44] These nests are small compared to honeybee hives, which hold about 50,000 bees. Many species nest underground, choosing old rodent burrows or sheltered places, and avoiding places that receive direct sunlight that could result in overheating. Other species make nests above ground, whether in thick grass or in holes in trees. A bumblebee nest is not organised into hexagonal combs like that of a honeybee the cells are instead clustered together untidily. The workers remove dead bees or larvae from the nest and deposit them outside the nest entrance, helping to prevent disease. Nests in temperate regions last only for a single season and do not survive the winter. [43]

In the early spring, the queen comes out of diapause and finds a suitable place to create her colony. Then she builds wax cells in which to lay her eggs which were fertilised the previous year. The eggs that hatch develop into female workers, and in time, the queen populates the colony, with workers feeding the young and performing other duties similar to honeybee workers. In temperate zones, young queens (gynes) leave the nest in the autumn and mate, often more than once, with males (drones) that are forcibly driven out of the colony. [45] The drones and workers die as the weather turns colder the young queens feed intensively to build up stores of fat for the winter. They survive in a resting state (diapause), generally below ground, until the weather warms up in the spring with the early bumblebee being the species that is among the first to emerge. [45] [46] [47] Many species of bumblebee follow this general trend within the year. Bombus pensylvanicus is a species that follows this type of colony cycle. [48] For this species the cycle begins in February, reproduction starts in July or August, and ends in the winter months. The queen remains in hibernation until spring of the following year in order to optimize conditions to search for a nest. [49]

In fertilised queens, the ovaries only become active when the queen starts to lay. An egg passes along the oviduct to the vagina where there is a chamber called the spermatheca, in which the sperm from the mating is stored. Depending on need, she may allow her egg to be fertilised. Unfertilised eggs become haploid males fertilised eggs grow into diploid females and queens. [51] The hormones that stimulate the development of the ovaries are suppressed in female worker bees, while the queen remains dominant. [45]

To develop, the larvae must be fed both nectar for carbohydrates and pollen for protein. Bumblebees feed nectar to the larvae by chewing a small hole in the brood cell into which they regurgitate nectar. Larvae are fed pollen in one of two ways, depending on the bumblebee species. Pocket-making bumblebees create pockets of pollen at the base of the brood-cell clump from which the larvae feed themselves. Pollen-storing bumblebees keep pollen in separate wax pots and feed it to the larvae. [52]

After the emergence of the first or second group of offspring, workers take over the task of foraging and the queen spends most of her time laying eggs and caring for larvae. The colony grows progressively larger and eventually begins to produce males and new queens. [45] Bumblebee workers can lay unfertilised haploid eggs (with only a single set of chromosomes) that develop into viable male bumblebees. Only fertilised queens can lay diploid eggs (one set of chromosomes from a drone, one from the queen) that mature into workers and new queens. [53]

In a young colony, the queen minimises reproductive competition from workers by suppressing their egg-laying through physical aggression and pheromones. [54] Worker policing leads to nearly all eggs laid by workers being eaten. [55] Thus, the queen is usually the mother of all of the first males laid. Workers eventually begin to lay male eggs later in the season when the queen's ability to suppress their reproduction diminishes. [56] Because of the reproductive competition between workers and the queen, bumblebees are considered "primitively eusocial". [10] [55]

Although a large majority of bumblebees follow such monogynous colony cycles that only involve one queen, some select Bombus species (such as Bombus atratus) will spend part of their life cycle in a polygynous phase (have multiple queens in one nest during these periods of polygyny). [57]

Foraging behaviour

Bumblebees generally visit flowers that exhibit the bee pollination syndrome and these patches of flowers may be up to 1–2 km from their colony. [58] They tend to visit the same patches of flowers every day, as long as they continue to find nectar and pollen there, [59] a habit known as pollinator or flower constancy. While foraging, bumblebees can reach ground speeds of up to 15 m/s (54 km/h). [60]

Bumblebees use a combination of colour and spatial relationships to learn which flowers to forage from. [61] They can also detect both the presence and the pattern of electric fields on flowers, which occur due to atmospheric electricity, and take a while to leak away into the ground. They use this information to find out if a flower has been recently visited by another bee. [62] Bumblebees can detect the temperature of flowers, [63] as well as which parts of the flower are hotter or cooler [64] and use this information to recognise flowers. After arriving at a flower, they extract nectar using their long tongues ("glossae") and store it in their crops. Many species of bumblebees also exhibit "nectar robbing": instead of inserting the mouthparts into the flower in the normal way, these bees bite directly through the base of the corolla to extract nectar, avoiding pollen transfer. [65]

Pollen is removed from flowers deliberately or incidentally by bumblebees. Incidental removal occurs when bumblebees come in contact with the anthers of a flower while collecting nectar. When it enters a flower, the bumblebee's body hairs receive a dusting of pollen from the anthers. In queens and workers this is then groomed into the corbiculae (pollen baskets) on the hind legs where it can be seen as bulging masses that may contain as many as a million pollen grains. Male bumblebees do not have corbiculae and do not purposively collect pollen. [66] Bumblebees are also capable of buzz pollination, in which they dislodge pollen from the anthers by creating a resonant vibration with their flight muscles. [67]

In at least some species, once a bumblebee has visited a flower, it leaves a scent mark on it. This scent mark deters bumblebees from visiting that flower until the scent degrades. [68] This scent mark is a general chemical bouquet that bumblebees leave behind in different locations (e.g. nest, neutral, and food sites), [69] and they learn to use this bouquet to identify both rewarding and unrewarding flowers, [70] and may be able to identify who else has visited a flower. [71] Bumblebees rely on this chemical bouquet more when the flower has a high handling time, that is, where it takes a longer time for the bee to find the nectar once inside the flower. [72]

Once they have collected nectar and pollen, female workers return to the nest and deposit the harvest into brood cells, or into wax cells for storage. Unlike honeybees, bumblebees only store a few days' worth of food, so are much more vulnerable to food shortages. [73] Male bumblebees collect only nectar and do so to feed themselves. They may visit quite different flowers from the workers because of their different nutritional needs. [74]

Asynchronous flight muscles

Bees beat their wings about 200 times a second. Their thorax muscles do not contract on each nerve firing, but rather vibrate like a plucked rubber band. This is efficient, since it lets the system consisting of muscle and wing operate at its resonant frequency, leading to low energy consumption. Further, it is necessary, since insect motor nerves generally cannot fire 200 times per second. [75] These types of muscles are called asynchronous muscles [76] and are found in the insect wing systems in families such as Hymenoptera, Diptera, Coleoptera, and Hemiptera. [75] Bumblebees must warm up their bodies considerably to get airborne at low ambient temperatures. Bumblebees can reach an internal thoracic temperature of 30 °C (86 °F) using this method. [25] [77]

Cuckoo bumblebees

Bumblebees of the subgenus Psithyrus (known as 'cuckoo bumblebees', and formerly considered a separate genus) are brood parasites, [78] sometimes called kleptoparasites, [79] in the colonies of other bumblebees, and have lost the ability to collect pollen. Before finding and invading a host colony, a Psithyrus female, such as that of the Psithyrus species of B. sylvestris, [80] feeds directly from flowers. Once she has infiltrated a host colony, the Psithyrus female kills or subdues the queen of that colony, and uses pheromones and physical attacks to force the workers of that colony to feed her and her young. [81] Usually, cuckoo bumblebees can be described as queen-intolerant inquilines, since the host queen is often killed to enable the parasite to produce more offspring, [78] though some species, such as B. bohemicus, actually enjoy increased success when they leave the host queen alive. [82]

The female Psithyrus has a number of morphological adaptations for combat, such as larger mandibles, a tough cuticle and a larger venom sac that increase her chances of taking over a nest. [83] Upon emerging from their cocoons, the Psithyrus males and females disperse and mate. The males do not survive the winter but, like nonparasitic bumblebee queens, Psithyrus females find suitable locations to spend the winter and enter diapause after mating. They usually emerge from hibernation later than their host species. Each species of cuckoo bee has a specific host species, which it may physically resemble. [84] In the case of the parasitism of B. terrestris by B. (Psithyrus) vestalis, genetic analysis of individuals captured in the wild showed that about 42% of the host species' nests at a single location [a] had "[lost] their fight against their parasite". [78]

Sting

Queen and worker bumblebees can sting. Unlike in honeybees, a bumblebee's stinger lacks barbs, so the bee can sting repeatedly without injuring itself by the same token, the stinger is not left in the wound. [85] [86] Bumblebee species are not normally aggressive, but may sting in defence of their nest, or if harmed. Female cuckoo bumblebees aggressively attack host colony members, and sting the host queen, but ignore other animals unless disturbed. [87]

The sting is painful to humans, and not medically significant in most cases, although it may trigger an allergic reaction in susceptible individuals. [ citation needed ]

Bumblebees, despite their ability to sting, are eaten by certain predators. Nests may be dug up by badgers and eaten whole, including any adults present. [88] Adults are preyed upon by robber flies and beewolves in North America. [89] In Europe, birds including bee-eaters and shrikes capture adult bumblebees on the wing smaller birds such as great tits also occasionally learn to take bumblebees, while camouflaged crab spiders catch them as they visit flowers. [90]

The great grey shrike is able to detect flying bumblebees up to 100 m (330 ft) away once captured, the sting is removed by repeatedly squeezing the insect with the mandibles and wiping the abdomen on a branch. [91] The European honey buzzard follows flying bees back to their nest, digs out the nest with its feet, and eats larvae, pupae and adults as it finds them. [92]

Bumblebees are parasitised by tracheal mites, Locustacarus buchneri protozoans including Crithidia bombi and Apicystis bombi and microsporidians including Nosema bombi and Nosema ceranae. The tree bumblebee B. hypnorum has spread into the United Kingdom despite hosting high levels of a nematode that normally interferes with queen bees' attempts to establish colonies. [93] Deformed wing virus has been found to affect 11% of bumblebees in Great Britain. [94]

Female bee moths (Aphomia sociella) prefer to lay their eggs in bumblebee nests. The A. sociella larvae will then feed on the eggs, larvae, and pupae left unprotected by the bumblebees, sometimes destroying large parts of the nest. [95]

Agricultural use

Bumblebees are important pollinators of both crops and wildflowers. [96] Because bumblebees do not overwinter the entire colony, they do not stockpile honey, and therefore are not useful as honey producers. Bumblebees are increasingly cultured for agricultural use as pollinators, among other reasons because they can pollinate plants such as tomato in greenhouses by buzz pollination whereas other pollinators cannot. [97] Commercial production began in 1987, when Roland De Jonghe founded the Biobest company in 1988 they produced enough nests to pollinate 40 hectares of tomatoes. The industry grew quickly, starting with other companies in the Netherlands. Bumblebee nests, mainly of buff-tailed bumblebees, are produced in at least 30 factories around the world over a million nests are grown annually in Europe Turkey is a major producer. [98]

Bumblebees are Northern Hemisphere animals. When red clover was introduced as a crop to New Zealand in the nineteenth century, it was found to have no local pollinators, and clover seed had accordingly to be imported each year. Four species of bumblebee from the United Kingdom were therefore imported as pollinators. In 1885 and 1886 the Canterbury Acclimatization Society brought in 442 queens, of which 93 survived and quickly multiplied. As planned, red clover was soon being produced from locally-grown seed. [35] Bumblebees are also reared commercially to pollinate tomatoes grown in greenhouses. [51] The New Zealand population of buff-tailed bumblebees began colonising Tasmania, 1,500 miles (2,400 km) away, after being introduced there in 1992 under unclear circumstances. [99]

Some concerns exist about the impact of the international trade in mass-produced bumblebee colonies. Evidence from Japan [100] and South America [101] indicates bumblebees can escape and naturalise in new environments, causing damage to native pollinators. Greater use of native pollinators, such as Bombus ignitus in China and Japan, has occurred as a result. [102] In addition, mounting evidence indicates mass-produced bumblebees may also carry diseases, harmful to wild bumblebees [103] [104] and honeybees. [104]

In Canada and Sweden it has been shown that growing a mosaic of different crops encourages bumblebees and provides higher yields than does a monoculture of oilseed rape, despite the fact that the bees were attracted to the crop. [105]

Population decline

Bumblebee species are declining in Europe, North America, and Asia due to a number of factors, including land-use change that reduces their food plants. In North America, pathogens are possibly having a stronger negative effect especially for the subgenus Bombus. [106] A major impact on bumblebees was caused by the mechanisation of agriculture, accelerated by the urgent need to increase food production during the Second World War. Small farms depended on horses to pull implements and carts. The horses were fed on clover and hay, both of which were permanently grown on a typical farm. Little artificial fertiliser was used. Farms thus provided flowering clover and flower-rich meadows, favouring bumblebees. Mechanisation removed the need for horses and most of the clover artificial fertilisers encouraged the growth of taller grasses, outcompeting the meadow flowers. Most of the flowers, and the bumblebees that fed on them, disappeared from Britain by the early 1980s. The last native British short-haired bumblebee was captured near Dungeness in 1988. [107] This significant increase in pesticide and fertilizer use associated with the industrialization of agriculture has had adverse effects on the genus Bombus. The bees are directly exposed to the chemicals in two ways: by consuming nectar that has been directly treated with pesticide, or through physical contact with treated plants and flowers. The species Bombus hortorum in particular has been found to be impacted by the pesticides their brood development has been reduced and their memory has been negatively affected. Additionally, pesticide use negatively impacts colony development and size. [108]

Bumblebees are in danger in many developed countries due to habitat destruction and collateral pesticide damage. The European Food Safety Authority ruled that three neonicotinoid pesticides (clothianidin, imidacloprid, and thiamethoxam) presented a high risk for bees. [109] While most work on neonicotinoid toxicity has looked at honeybees, a study on B. terrestris showed that "field-realistic" levels of imidacloprid significantly reduced growth rate and cut production of new queens by 85%, implying a "considerable negative effect" on wild bumblebee populations throughout the developed world. [110] However, in another study, following chronic exposure to field-realistic levels of the neonicotinoid pesticide thiamethoxam, colony weight gain was not affected, nor were the number or mass of sexuals produced. [111] Low levels of neonicotinoids can reduce the number of bumblebees in a colony by as much as 55%, and cause dysfunction in the bumblebees' brains. The Bumblebee Conservation Trust considers this evidence of reduced brain function "particularly alarming given that bumblebees rely upon their intelligence to go about their daily tasks." [112] A study on B. terrestris had results that suggests that use of neonicotinoid pesticides can affect how well bumblebees are able to forage and pollinate. Bee colonies that had been affected by the pesticide released more foragers and collected more pollen than bees who had not been dosed with neonicotinoid. [113] Although the bees affected by the pesticide were able to collect more pollen, they took a longer amount of time doing so. [114]

Of 19 species of native nestmaking bumblebees and six species of cuckoo bumblebees formerly widespread in Britain, [115] three have been extirpated, [116] [117] eight are in serious decline, and only six remain widespread. [118] Similar declines have been reported in Ireland, with four species designated endangered, and another two considered vulnerable to extinction. [119] A decline in bumblebee numbers could cause large-scale changes to the countryside, resulting from inadequate pollination of certain plants. [120]

Some bumblebees native to North America are also vanishing, such as Bombus balteatus, [121] Bombus terricola, [122] Bombus affinis, [123] [124] and Bombus occidentalis, and one, Bombus franklini, may be extinct. [125] In South America, Bombus bellicosus was extirpated in the northern limit of its distribution range, probably due to intense land use and climate change effects. [126]

Conservation efforts

In 2006 the bumblebee researcher Dave Goulson founded a registered charity, the Bumblebee Conservation Trust, to prevent the extinction "of any of the UK's bumblebees." [127] [128] In 2009 and 2010, the Trust attempted to reintroduce the short-haired bumblebee, Bombus subterraneus, which had become extinct in Britain, from the British-derived populations surviving in New Zealand from their introduction there a century earlier. [129] From 2011 the Trust, in partnership with Natural England, Hymettus and the RSPB, has reintroduced short-haired bumblebee queens from Skåne in southern Sweden to restored flower-rich meadows at Dungeness in Kent. The queens were checked for mites and American foulbrood disease. Agri-environment schemes spread across the neighbouring area of Romney Marsh have been set up to provide over 800 hectares of additional flower-rich habitat for the bees. By the summer of 2013, workers of the species were found near the release zone, proving that nests had been established. The restored habitat has produced a revival in at least five "Schedule 41 priority" species: the ruderal bumblebee, Bombus ruderatus the red-shanked carder bee, Bombus ruderarius the shrill carder bee, Bombus sylvarum the brown-banded carder bee, Bombus humilis and the moss carder bee, Bombus muscorum. [130]

The world's first bumblebee sanctuary was established at Vane Farm in the Loch Leven National Nature Reserve in Scotland in 2008. [120] In 2011, London's Natural History Museum led the establishment of an International Union for the Conservation of Nature Bumblebee Specialist Group, chaired by Dr. Paul H. Williams, [131] to assess the threat status of bumblebee species worldwide using Red List criteria. [132]

Bumblebee conservation is in its infancy in many parts of the world, but with the realization of the important part they play in pollination of crops, efforts are being made to manage farmland better. Enhancing the wild bee population can be done by the planting of wildflower strips, and in New Zealand, bee nesting boxes have achieved some success, perhaps because there are few burrowing mammals to provide potential nesting sites in that country. [105]

Misconception about flight

According to 20th-century folklore, the laws of aerodynamics prove the bumblebee should be incapable of flight, as it does not have the capacity (in terms of wing size or beats per second) to achieve flight with the degree of wing loading necessary. [134]

'Supposedly someone did a back of the envelope calculation, taking the weight of a bumblebee and its wing area into account, and worked out that if it only flies at a couple of metres per second, the wings wouldn't produce enough lift to hold the bee up,' explains Charlie Ellington, Professor of Animal Mechanics at Cambridge University. [134]

The origin of this claim has been difficult to pin down with any certainty. John H. McMasters recounted an anecdote about an unnamed Swiss aerodynamicist at a dinner party who performed some rough calculations and concluded, presumably in jest, that according to the equations, bumblebees cannot fly. [135] In later years, McMasters backed away from this origin, suggesting there could be multiple sources, and the earliest he has found was a reference in the 1934 book Le Vol des Insectes by French entomologist Antoine Magnan (1881–1938) they had applied the equations of air resistance to insects and found their flight was impossible, but "One shouldn't be surprised that the results of the calculations don't square with reality". [136]

The following passage appears in the introduction to Le Vol des Insectes: [137]

Tout d'abord poussé par ce qui se fait en aviation, j'ai appliqué aux insectes les lois de la résistance de l'air, et je suis arrivé avec M. Sainte-Laguë à cette conclusion que leur vol est impossible.

First prompted by what is done in aviation, I applied the laws of air resistance to insects, and I arrived, with Mr. Sainte-Laguë, at this conclusion that their flight is impossible.

Magnan refers to his assistant André Sainte-Laguë. [138] Some credit physicist Ludwig Prandtl (1875–1953) of the University of Göttingen in Germany with popularizing the idea. Others say Swiss gas dynamicist Jakob Ackeret (1898–1981) did the calculations. [139]

The calculations that purported to show that bumblebees cannot fly are based upon a simplified linear treatment of oscillating aerofoils. The method assumes small amplitude oscillations without flow separation. This ignores the effect of dynamic stall (an airflow separation inducing a large vortex above the wing), which briefly produces several times the lift of the aerofoil in regular flight. More sophisticated aerodynamic analysis shows the bumblebee can fly because its wings encounter dynamic stall in every oscillation cycle. [140]

Additionally, John Maynard Smith, a noted biologist with a strong background in aeronautics, has pointed out that bumblebees would not be expected to sustain flight, as they would need to generate too much power given their tiny wing area. However, in aerodynamics experiments with other insects, he found that viscosity at the scale of small insects meant even their small wings can move a very large volume of air relative to their size, and this reduces the power required to sustain flight by an order of magnitude. [141]

In music and literature

The orchestral interlude Flight of the Bumblebee was composed (c. 1900) by Nikolai Rimsky-Korsakov. It represents the turning of Prince Guidon into a bumblebee so he can fly away to visit his father, Tsar Saltan, in the opera The Tale of Tsar Saltan, [142] although the music may reflect the flight of a bluebottle rather than a bumblebee. [143] The music inspired Walt Disney to feature a bumblebee in his 1940 animated musical Fantasia and have it sound as if it were flying in all parts of the theater. This early attempt at "surround sound" was unsuccessful, and the music was excluded from the film's release. [144]

In 1599, during the reign of Queen Elizabeth I, someone, possibly Tailboys Dymoke, published Caltha Poetarum: Or The Bumble Bee, under the pseudonym "T. Cutwode". [145] This was one of nine books censored under the Bishop's Ban issued by the Archbishop of Canterbury John Whitgift and the Bishop of London Richard Bancroft. [146]

Emily Dickinson made a bumblebee the subject of her parody of Isaac Watts's well-known poem about honeybees, How Doth the Little Busy Bee (1715). Where Watts wrote "How skilfully she builds her cell! How neat she spreads the wax!", [147] Dickinson's poem, "The Bumble-Bee's Religion" (1881) begins "His little Hearse-like Figure / Unto itself a Dirge / To a delusive Lilac / The vanity divulge / Of Industry and Morals / And every righteous thing / For the divine Perdition / of Idleness and Spring." The letter was said to have enclosed a dead bee. [148] [149]

The entomologist Otto Plath wrote Bumblebees and Their Ways in 1934. [150] His daughter, the poet Sylvia Plath, wrote a group of poems about bees late in 1962, within four months of her suicide, [151] transforming her father's interest into her poetry. [152]

The scientist and illustrator Moses Harris (1731–1785) painted accurate watercolour drawings of bumblebees in his An Exposition of English Insects Including the Several Classes of Neuroptera, Hymenoptera, & Diptera, or Bees, Flies, & Libellulae (1776–80). [153]

Bumblebees appear as characters, often eponymously, in children's books. The surname Dumbledore in the Harry Potter series (1997–2007) is an old name for bumblebee. [7] J. K. Rowling said the name "seemed to suit the headmaster, because one of his passions is music and I imagined him walking around humming to himself". [154] J. R. R. Tolkien, in his poem Errantry, also used the name Dumbledor, but for a large bee-like creature.

Among the many books for younger children are Bumble the Bee by Yvon Douran and Tony Neal (2014) Bertie Bumble Bee by K. I. Al-Ghani (2012) Ben the Bumble Bee: How do bees make honey? by Romessa Awadalla (2015) Bumble Bee Bob Has a Big Butt by Papa Campbell (2012) Buzz, Buzz, Buzz! Went Bumble-bee by Colin West (1997) Bumble Bee by Margaret Wise Brown (2000) How the Bumble Came to Bee by Paul and Ella Quarry (2012) The Adventures of Professor Bumble and the Bumble Bees by Stephen Brailovsky (2010). Among Beatrix Potter's "little books", Babbity Bumble and other members of her nest appear in The Tale of Mrs. Tittlemouse (1910).

Military

The United States Naval Construction Battalions adopted the bumblebee as their insignia in 1942. [ citation needed ]

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Bumblebee (?) identification - Biology

Most bumble bees are large, social bees which produce annual colonies. Mated queens overwinter in the soil and emerge from hibernation in early spring when they feed on spring flowers and search for a suitable location, such as a former rodent burrow in the soil, to begin their colonies. These are beneficial insects that pollinate many native and ornamental plants. They can sting severely, so problem nests near human dwellings should be removed by experienced pest control operators.

Figure 1. Adult bumble bee, Bombus sp. Photograph by Clemson University www.insectimages.org.

Distribution (Back to Top)

All of the social bumble bee species found in Florida range as far north as Canada (Laverty and Harder 1988). Bumble bees are less common in southern Florida. None are known from the Florida Keys. Two species, Bombus griseocollis and Bombus pensylvanicus, are known from Collier County whereas a third species, Bombus impatiens, has been collected in West Palm County.

Description (Back to Top)

Bumble bees are easily recognized by the corbicula (pollen basket) on the hind tibiae in the females. Honey bees are the only other bees in Florida with this structure, but are easily recognized by their smaller size, hairy eyes, and lack of hind tibial spurs. Large carpenter bees are often misidentified as bumble bees, but these are readily distinguished from bumble bees primarily due to the absence of pubescence on the dorsum of the carpenter bee abdomen, which is somewhat glossy.

Figure 2. A bumble bee, Bombus sp., with full pollen basket. Photograph by Tony Wills, en.wikipedia.org.

The five species of bumble bees found in Florida are usually separated by the pattern of the black and yellow pubescence.

A number of non-social Bombus species lost their social behavior and the ability to collect pollen, and are now cleptoparasites on colonies of pollen-collecting Bombus species. These cleptoparasitic species were previously listed as being in the genus Psithyrus (ITIS 2011), and are now sometimes listed as a sub-genus. The parasitic species are easily distinguished by the lack of the corbicula. The most common of this group found in Florida is Bombus variabilis.

Biology and Life Cycle (Back to Top)

Once a nest site is found, the social, bumble bee queen collects pollen and lays her first brood of worker eggs. Workers emerge about 21 days after the eggs are laid and take over the duties of pollen and nectar collection as well as colony defense. The size of the workers increases with each new brood. A third caste of bumble bees, the males, is usually produced in midsummer.

Figure 3. A bumble bee emerging backwards from her nest. Photograph by 'Pahazzard,' en.wikipedia.org.

List of Social Species in Florida (Back to Top)

Bombus bimaculatus Cresson 1863, the twospotted bumble bee. Its range extends from Ontario to Maine, south to Florida, and west to Illinois, Kansas, Oklahoma and Mississippi. Florida county records include: Alachua, Clay, Franklin, Highlands, Lake, Levy, Marion, Okaloosa, and Orange.

Figure 4. Adult female two-spotted bumble bee, Bombus bimaculatus Cresson. Photograph by John Baker, en.wikipedia.org.

Bombus fraternus (Smith) 1854, the southern plains bumble bee. Its range extends from New Jersey to Florida, and west to North and South Dakota, Nebraska, Colorado and New Mexico. Florida county records include: Alachua, Franklin, Gadsden, Levy, Liberty, Orange, and St. Johns.

Figure 5. Adult female southern plains bumble bee, Bombus fraternus (Smith). Photograph by Johnny N. Dell, www.insectimages.org.

Bombus griseocollis (DeGeer) 1773, the brown-belted bumble bee. Its range extends from Quebec and Maine to Florida, and throughout the American West (DL 21011). Florida county records include Alachua, Clay, Collier, Highlands, Marion, and Osceola.

Figure 6. Adult female brownbelted bumble bee, Bombus griseocollis (DeGeer). Photograph by Charles Schurch Lewallen.

Bombus impatiens Cresson 1863, the common eastern bumble bee. This species is native from Ontario to Maine and south to Florida and was introduced in California and in British Columbia, Canada (EOL 2011). Florida county records include Alachua, Bradford, Calhoun, Escambia, Franklin, Jackson, Gadsden, Highlands, Levy, Liberty, Okaloosa, Orange, Palm Beach, Polk,and Santa Rosa.

Figure 7. Adult female common eastern bumble bee, Bombus impatiens Cresson. Photograph by David Cappaert, Michigan State University www.insectimages.org.

Bombus pensylvanicus (DeGeer) 1773, the American bumble bee. Its range extends from Quebec and Ontario, Maryland south to Florida, then west to Minnesota, South Dakota, Nebraska, Colorado, New Mexico and Mexico (Anonymous 2011). Florida county records include: Alachua, Bradford, Collier, Escambia, Flagler, Highlands, Lake, Lee, Levy, Marion, Orange, Putnam, Sarasota, Santa Rosa.

Figure 8. Adult female American bumble bee, Bombus pensylvanicus (DeGeer). Photograph by 'Skoch3', Wikipedia.

Bombus terricola Kirby 1837, the yellow-banded bumble bee. Originally, this species extended from Nova Scotia to Florida, west to British Columbia, Montana and South Dakota. While once common, its has declined dramatically since 1990 (Anonymous 2011). No specimens seen from Florida, but recorded from Florida by Mitchell (1962).

Figure 9. Adult female yellow-banded bumble bee, Bombus terricola Kirby. Photograph by Mardon Erbland.

Key to the Bumble Bees in Florida (Back to Top)

Figure 10. Figures of Florida Bombus spp. 1. Bombus fraternus, 2. Bombus pensylvanicus, 3. Bombus impatiens, 4. Bombus griseocollis, 5. Bombus bimaculatus, 6. Bombus griseocollis, 7. Bombus bimaculatus. Photograph by Division of Plant Industry.

1. Antenna with 12 segments abdomen with six visible terga tip of abdomen pointed, with stinger corbiculae on hind tibiae (not Psithyrus) active all summer females (queens and workers) . . . . . 2
1'. Antenna with 13 segments abdomen with seven visible terga tip of abdomen round, no stinger hind tibia lack corbiculae active from middle of summer till winter males . . . . . 7

2. Hind tibia relatively slender, without corbiculae cleptoparasitic forms . . . . . Bombus variabilis
2'. Hind tibia with well-developed corbiculae (pollen-collecting Bombus spp.) . . . . . 3

3. Posterior half of scutum and all of scutellum with black pubescence (No. 2) . . . . . Bombus pensylvanicus
3'. Posterior half of scutum and scutellum with some yellow pubescence . . . . . 4

4. Dorsum of thorax with a conspicuous, transverse band of black pubescence between wing bases (No. 1) . . . . . Bombus fraternus
4'. Dorsum of thorax without transverse black band between wing bases . . . . . 5

6. Lateral ocellus distinctly below supraorbital line (No. 6) . . . . . Bombus griseocollis
6'. Lateral ocellus at level of supraorbital line (No. 7) . . . . . Bombus bimaculatus

7. Hind tibia convex, densely pubescent on outer surface gonostylus much exceeding apex of gonocoxites cleptoparasitic forms . . . . . Bombus variabilis
7'. Hind tibia somewhat flattened, sparsely pubescent on outer surface gonostylus not much exceeding apex of gonocoxite (pollen-collecting Bombus spp.) . . . . . 8

8. Eyes usually converging above, lateral ocelli nearer margins of eyes than to each other malar space no more than 1/4 basal width of mandible . . . . . 9
8'. Eyes about parallel, lateral ocelli closer to each other than to eye margins malar space about as long as basal width of mandible . . . . . 10

9. Malar space nearly obliterated eye nearly touching base of mandible . . . . . Bombus fraternus
9'. Malar space distinct eye somewhat removed from base of mandible . . . . . Bombus griseocollis

10. Dorsum of thorax with a median band of black pubescence . . . . . Bombus pensylvanicus
10'. Dorsum of thorax entirely yellow pubescent or with median patch of black hairs that do not reach tegulae . . . . . 11

11. Segment two of abdomen entirely black pubescent . . . . . Bombus impatiens
11'. Segment two of abdomen with at least some yellow pubescence . . . . . Bombus bimaculatus

Selected References (Back to Top)

  • Anonymous. (2011). North American bumblebees. Bumblebee.org. (2 March 2021)
  • DL. (2011). Bombus griseocollis (DeGeer, 1773). Discover Life. (January 2018).
  • EOL. (October 2011). Bombus impatiens, Common Eastern Bumble Bee. Encyclopedia of Life. (January 2018).
  • ITIS. (2011). Psithyrus variabilis (Cresson, 1872). Integrated Taxonomic Information System. (January 2018).
  • Mitchell TB. 1962. Bees of the Eastern United States. Volume II. Technical Bulletin No. 152, North Carolina Agricultural Experiment Station, pp. 1-557.
  • Laverty TM, Harder LD. 1988. The bumble bees of Eastern Canada. Canadian Entomologist 120: 965-987.
  • Morse DH. 1982. Behavior and ecology of bumble bees, pp. 245-322 . In Hermann, H.R. (Ed.) Social Insects, Vol. 3. Academic Press, New York & London.

Web Design: Don Wasik, Jane Medley
Publication Number: EENY-50
Publication Date: August 1998. Revised: December 2014. Reviewed: January 2018. Latest revision: April 2021.


Bumble Bee

Characteristics
Bumble bees are similar to their close relatives, the honey bees, in that their colonies are headed by a queen, who is the main egg-layer, and many workers, who are the daughters of the queen, and in that drones (males) are produced during the mating season. However, the colonies of bumble bees, unlike those of honey bees, only survive during the warm season new queens hibernate alone to begin another colony the following spring. In addition, there are usually fewer individuals in a bumble-bee colony than in a honey-bee colony, and bumble bees do not use a dance to communicate the location of food to other members of the colony, as honey bees do. Also, although bumble bees collect nectar and store it as honey, they do not hoard large amounts of it, as do honey bees.

Because bumble bees are conspicuous and important in nature, their biology has been well studied. They are among the few insects that can control their body temperature. In cold weather, queens and workers can shiver their flight muscles to warm themselves, allowing them to fly and work at lower temperatures than most other insects. Their large size and heat-conserving hairy coats also help them stay warm. These features enable them to live in northern latitudes and alpine altitudes. Bumble bees are sensitive to habitat disturbance. In England, several species are thought to have become extinct in past decades due to land clearing and agricultural practices.

Life of the Colony
The bumble-bee nest consists of a spherical chamber with a single exit. The queen chooses a preexisting cavity, such as an abandoned mouse nest, in which to begin her family. Most species nest in the ground. The queen forms a small mound of pollen paste in the middle of the nest, lays several eggs in it, and seals it with a small dome of wax. She also constructs a hemispherical wax cup, called a honeypot, in the entranceway floor and fills it with nectar. The queen feeds on this nectar while she incubates the eggs. The newly hatched larvae partially consume the paste in their cells. Later they are fed by the queen through a small opening in the cell wall. When the larvae are fully grown, they spin cocoons in which they metamorphose, eventually emerging as the first workers of the new colony. Subsequent larvae are reared by these workers in individual cells, much as honey-bee larvae are however, the bumble-bee nest is not organized into flat, vertical combs like that of honey bees but grows instead into a mound of capsule like cells. Toward the end of summer, the queen begins to lay unfertilized eggs that develop into drones. Female offspring produced at this time become new queens, and mating takes place soon afterward. The drones and workers then die, and the new, mated queens fly off in search of safe places to hibernate.

Some species of bumble bees, known as cuckoo bumble bees, are parasitic on the nests of nonparasitic bumble bees. They invade the nest, kill the resident queen, and force the workers to raise the young parasitic bees along with the brood of the host colony. Occasionally, the invaders permit only their own young to survive. Cuckoo bumble bees lack pollen baskets because they do not forage for pollen.

Pollination
Bumble bees are important pollinators of many plants. Both queens and workers collect pollen and transport it back to the colony in pollen baskets on their hind legs. Workers are small if born early in the year, and large if born later in the year. Also, some species of bumble bees are larger than others. Differences in body size, and especially in tongue length, are important in determining which flower species a bumble bee will visit for nectar and may determine which flowers it can pollinate.

Bumble bees have long been recognized as vital to the production of certain seed crops. In recent years, bee scientists have developed a means to cause queens to skip their winter hibernation and produce colonies year-round. This has made certain species of bumble bees available for use in pollinating crops they did not before. Bumble-bee colonies are now used extensively in greenhouse pollination of crops such as tomatoes and strawberries.

Scientific classification: Bumble bees belong to the genus Bombus of the family Apidae, order Hymenoptera.


  • What bumblebees are usually doing right after hibernation
  • What gives the bumblebees their color
  • How to identify the most common types of bumblebees in Western Oregon
  • What is Mullerian mimicry and how it affects how similar some bumblebees look
  • Why certain visual traits are localized to certain areas
  • What the “standard hybrid zone” is and how it affects the coloring of bumblebee species
  • What Briana is trying to accomplish in researching these coloring complexities
  • How Briana was able to study the evolution of the bee coloring
  • When a bee would avoid Mullerian mimicry to stand out from other species

“Oregon is one of those places that has a lot of species [of bumblebee] that look like each other.“ – Briana Ezray


Conservation status

Many bumblebees are listed as endangered, vulnerable or near threatened by the International Union for Conservation of Nature and Natural Resource's Red List of Threatened Species.

The variable cuckoo bumblebee is listed as critically endangered by the IUCN and is considered one of the rarest species in North American. The rusty patched bumblebee is also listed as critically endangered, and in early 2017 it became the first wild bee in the continental United States to get federal protection under the Endangered Species Act, according to Scientific American.

There is a lot of discussion as to why the overall be population is declining. Some scientists think that there may be a sickness killing off the bees. Others think pollution, global warming or lack of native flowers may be to blame.


Watch the video: Bumblebee 2018 - Official Teaser Trailer - Paramount Pictures (August 2022).