Bombus bifarius

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Bombus bifarius
Bombus bifarius P1530265a.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Apidae
Genus: Bombus
Subgenus: Pyrobombus
Species:
B. bifarius
Binomial name
Bombus bifarius
Cresson, 1878 [2]

Bombus bifarius, the two-form bumblebee, is a species of eusocial bumblebee of the subgenus Pyrobombus. B. bifarius inhabits mountainous regions of western North America, primarily the states of Colorado and Utah. Its common name refers to a historical artifact, in that it was believed that this species had a color polymorphism, with a red-tailed nominate form and a black-tailed nearcticus form, present in the species. [1] This polymorphism has recently been shown to belong instead to a cryptic sister species, Bombus vancouverensis , that occupies almost the entirety of the range of what was formerly classified as bifarius; true bifarius only has a red form, so it is not "two-formed" at all. [3]

Contents

Taxonomy and phylogeny

Bombus bifarius was first described by Ezra Townsend Cresson in the 1878 Proceedings of the Academy of Natural Sciences of Philadelphia. [2] It is a member of the order Hymenoptera and the family Apidae, which also includes orchid bees, honey bees, and bumblebees. [1] It was long believed that B. bifarius expressed varying color patterns, with the two most observed being the nominate and nearcticus color patterns. [4] Red-tailed specimens classified as B. bifarius are found from Colorado all the way north to British Columbia, but have been found to comprise two different species (bifarius and Bombus vancouverensis ) while the nearcticus color pattern, primarily found in western Canada, Alaska, California, Oregon, Idaho, Montana, and Washington, belongs to vancouverensis and not to bifarius. [3] [5] Because of differences in genetic structuring between these populations in various geographic locations, there had been debate as early as 2013 suggesting these two major color pattern polymorphisms might represent more than one biological species. [6] [4] As of 2020, the genetic differentiation between bifarius and vancouverensis has been confirmed and characterized. [3]

Description and identification

Bombus bifarius has a relatively small body size ranging from 8 to 14 mm (0.31 to 0.55 in) for workers and 15–19 mm (0.59–0.75 in) for queens, with short, even hair covering their bodies. [5] Hair on the faces of B. bifarius individuals is usually yellow or white in color and sometimes exhibits black coloration on the top of the head. [5] In at least the lowermost third of the thorax, there is also black coloration. [5] The hindlegs and pollen baskets are brownish-orange, and the hairs on metasomal tergites 2 and 3 are red. [5]

Sexual dimorphism

Males are similar in size to female workers, ranging from 8 to 13 mm (0.31 to 0.51 in). [5] Their eyes are also similar in size and shape to those of their female counterparts. [5] Colorations on their bodies are similar to those of workers and the queens. [5]

Distribution

Bombus bifarius is found in mountainous regions of western North America, limited to northern Arizona, Colorado, northern New Mexico, Utah, and southern Wyoming; populations from all other areas formerly classified as bifarius belong instead to B. vancouverensis. [3]

Related Research Articles

Bumblebee Genus of insect

A bumblebee is any of over 250 species in the genus Bombus, part of Apidae, one of the bee families. This genus is the only extant group in the tribe Bombini, though a few extinct related genera are known from fossils. They are found primarily in higher altitudes or latitudes in the Northern Hemisphere, although they are also found in South America, where a few lowland tropical species have been identified. European bumblebees have also been introduced to New Zealand and Tasmania. Female bumblebees can sting repeatedly, but generally ignore humans and other animals.

<i>Bombus fraternus</i> Species of bee

Bombus fraternus is an endangered species of bumblebee known commonly as the Southern Plains bumblebee. It is native to the United States east of the Rocky Mountains. It is most often encountered in the southern Great Plains and along the Gulf Coastal Plain. This species has been found as far north as New Jersey and North Dakota, and as far south as Florida along the Gulf Coastal Plain into the state of Chihuahua in Mexico. This species was uncommon historically, but having faced declines in population; its estimated abundance is less than 15% of historical numbers.

<i>Bombus lapidarius</i> Species of bee

Bombus lapidarius is a species of bumblebee in the subgenus Melanobombus. Commonly known as the red-tailed bumblebee, B. lapidarius can be found throughout much of Central Europe. Known for its distinctive black and red body, this social bee is important in pollination.

<i>Bombus variabilis</i> Species of bee

Bombus variabilis is a critically endangered species of cuckoo bumblebee.

<i>Bombus suckleyi</i> Species of bee

Bombus suckleyi is a species of bumblebee known commonly as Suckley's cuckoo bumblebee, named after biologist George Suckley. Suckley's bumble bee is a generalist pollinator and represents a rare group of obligate, parasitic bumble bees. Suckley's bumble bee is a social-parasite because it invades the nests of the host bumble bees, including the western bumble bee, and relies on host species workers to provision its larvae. It is native to northwestern North America, including Alaska and parts of western and central Canada and the western United States.

<i>Bombus lucorum</i> Species of bee

Bombus lucorum, the white-tailed bumblebee, is a species of bumblebee, widespread and common throughout Europe. This name has been widely used for a range of nearly identical-looking or cryptic species of bumblebees. In 1983, Scholl and Obrecht even coined the term Bombus lucorum complex to explain the three taxa that cannot be easily differentiated from one another by their appearances. A recent review of all of these species worldwide has helped to clarify its distribution in Europe and northern Asia, almost to the Pacific. B. lucorum reaches the Barents Sea in the North. However, in southern Europe, although found in Greece it is an upland species with its distribution never quite reaching the Mediterranean.

<i>Bombus pensylvanicus</i> Species of bee

Bombus pensylvanicus, the American bumblebee, is a threatened species of bumblebee native to North America. It occurs in eastern Canada, throughout much of the Eastern United States, and much of Mexico.

Two-spotted bumble bee Species of bee

The two-spotted bumble bee is a species of social bumble bee found in the eastern half of the United States and the adjacent south-eastern part of Canada. In older literature this bee is often referred to as Bremus bimaculatus, Bremus being a synonym for Bombus. The bee's common name comes from the two yellow spots on its abdomen. Unlike many of the other species of bee in the genus Bombus,B. bimaculatus is not on the decline, but instead is very stable. They are abundant pollinators that forage at a variety of plants.

<i>Bombus vosnesenskii</i> Species of bee

Bombus vosnesenskii, the yellow-faced bumblebee, is a species of bumblebee native to the west coast of North America, where it is distributed from British Columbia to Baja California. It is the most abundant species of bee in this range, and can be found in both urban and agricultural areas. Additionally, B. vosnesenskii is utilized as an important pollinator in commercial agriculture, especially for greenhouse tomatoes. Though the species is not currently experiencing population decline, urbanization has affected its nesting densities, and early emergence of the B. vosnesenskii has been implicated in the increasing lack of bee diversity on the West coast.

<i>Bombus occidentalis</i> Species of bee

Bombus occidentalis, the western bumblebee, is one of around 30 bumblebee species present in the western United States and western Canada. A recent review of all of its close relatives worldwide appears to have confirmed its status as a separate species.

Pyrobombus Subgenus of insects

Pyrobombus is a subgenus of bumblebees, with its centres of diversity in Central Asia and north-western North America. Nearly a fifth of all Bombus species fall within Pyrobombus and its member species vary considerably in size, appearance and behaviour. it covers 43 species of bees and is the largest subgenus of bumblebees, covering almost 50% of the North American fauna. They are seen to be declined by 6%, which may be an undervalued statistic, although not as high as other groups of bees. Pyrobombus bees also face issues such as climate change, loss of habitat, urbanization, and industrial agriculture. This subgenus of bees can pollinate that helps plants fertilise and grow fruit that is essential to the biodiversity and life of the environment. Commonly, Pyrobombus bees are used for beekeeping as they are pollinators. They can be for wax, honey, venom, combs, and such which may be collected for commercial use. This subgenus may vary in their characteristics such as body size, wingspan, and tongue length for individual species, but like all bees, they possess wings, a head, thorax, and abdomen.

<i>Bombus fervidus</i> Species of bee

Bombus fervidus, the golden northern bumble bee or yellow bumblebee, is a species of bumblebee native to North America. It has a yellow-colored abdomen and thorax. Its range includes the North American continent, excluding much of the southern United States, Alaska, and the northern parts of Canada. It is common in cities and farmland, with populations concentrated in the Northeastern part of the United States. It is similar in color and range to its sibling species, Bombus californicus, though sometimes also confused with the American bumblebee or black and gold bumblebee. It has complex behavioral traits, which includes a coordinated nest defense to ward off predators. B. fervidus is an important pollinator, so recent population decline is a particular concern.

<i>Bombus magnus</i> Species of bee

Bombus magnus is a species of bumblebee. It is native to Europe. It is known by the common name northern white-tailed bumblebee.

<i>Bombus sitkensis</i> Species of bee

Bombus sitkensis, the Sitka bumblebee, is a species of bumblebee common in western North America from Alaska to California.

<i>Bombus ephippiatus</i> Species of bee

Bombus ephippiatus is a species of bumblebee native to Mexico and Central America.

<i>Bombus griseocollis</i> Species of bee

Bombus griseocollis is a species of bumblebee known commonly as the brown-belted bumblebee. It is native to much of the United States except for the Southwest, and to the southernmost regions of several of the provinces of Canada.

<i>Bombus rufocinctus</i> Species of bumblebee

Bombus rufocinctus is a species of bumblebee known commonly as the "red-belted bumblebee." It is native to North America where it has a wide distribution across Canada and the western, midwestern, and northeastern United States. It may occur in Mexico.

<i>Bombus californicus</i> Species of bee

Bombus californicus, the California bumble bee, is a species of bumble bee in the family Apidae. Bombus californicus is in the subgenus Thoracobombus. It is found in Central America and the western half of North America. Bombus californicus is classified as Vulnerable by the IUCN.

<i>Bombus vancouverensis</i> Species of bee

Bombus vancouverensis is a common species of eusocial bumblebee of the subgenus Pyrobombus. B. vancouverensis inhabits mountainous regions of western North America, where it has long been considered as a synonym of Bombus bifarius, and essentially all of the literature on bifarius refers instead to vancouverensis. B. vancouverensis has been identified as one of the two species of bumblebee observed to use pheromones in kin recognition. The other is the frigid bumblebee, Bombus frigidus.

References

  1. 1 2 3 Hatfield, R.; Jepsen, S.; Thorp, R.; Richardson, L.; Colla, S. (2014). "Bombus bifarius". IUCN Red List of Threatened Species . 2014: e.T44937707A68999754. doi: 10.2305/IUCN.UK.2014-3.RLTS.T44937707A68999754.en . Retrieved 20 November 2021.
  2. 1 2 Cresson, E.T. (1878). "Descriptions of New Species of North American Bees". Proceedings of the Academy of Natural Sciences of Philadelphia: 181–221.
  3. 1 2 3 4 Ghisbain, G., J. D. Lozier, S. R. Rahman, B. D. Ezray, L. Tian et al. (2020) Substantial genetic divergence and lack of recent gene flow support cryptic speciation in a colour polymorphic bumble bee (Bombus bifarius) species complex. Syst. Entomol. 45: 635–652. doi:10.1111/syen.12419
  4. 1 2 Lozier, J.D.; Koch, J; Strange, J.P. (2013). "Landscape heterogeneity predicts gene flow in a widespread polymorphic bumble bee, Bombus bifarius (Hymenoptera: Apidae)". Conservation Genetics. 14 (5): 1099–1100. doi:10.1007/s10592-013-0498-3.
  5. 1 2 3 4 5 6 7 8 Williams, P.H.; Thorp, R.W.; Richardson, L.L.; Colla, S.R. (2014), The Bumble Bees of North America: An Identification Guide., Princeton: Princeton University Press
  6. Lozier, J.D., Strange, J.P. & Koch, J.B. (2013) Landscape heterogeneity predicts gene flow in a widespread polymorphic bumble bee, Bombus bifarius (Hymenoptera: Apidae). Conservation Genetics, 14, 1099–1110.