11/16/2023 0 Comments Bumbled bee![]() ![]() The IUCN Red List Category and Criteria rank for American Bumble Bee is Vulnerable. The NatureServe global conservation status rank is G3G4 (Vulnerable to Apparently Secure). There are no laws in Canada that specifically protect the American Bumble Bee, its nest sites, or habitat. American Bumble Bee also appears to have low genetic diversity, which likely contributes to its decline and increases the production of sterile males. The American Bumble Bees are susceptible to pesticide use, land use activities that reduce floral resources and/or nesting site availability, and pathogens. The specific causes of decline for American Bumble Bee are unknown, although it is likely due to a combination of factors. Overall trends suggest this species is becoming rarer throughout North America, though it continues to persist throughout its historical range in Canada. In some areas where it was once seemingly more common than it is at present it has not been detected, although this may be a reflection of sampling intensity. However, it appears to be declining in abundance in recent decades throughout its range, including Ontario where it represented <1% of all bumble bees collected in the last three decades. Historically, the American Bumble Bee is not considered a common species in Canada and represents 3 to 10% of bumble bee specimens collected in southern Ontario, likely because this represents the northern edge of its range. Mated queens subsequently enter hibernation while all other castes, including the old queen, perish by autumn. These reproductive individuals leave the colony to mate. In late summer, males and new queens are produced. Workers emerge and take over nest care, defence, and foraging. Once a nest site is chosen, the queen forages for pollen and nectar, returns to the nest site and lays eggs to produce a brood of workers. Mated queens (the colony founders) emerge from wintering sites in the spring, feed, and search for potential nest sites. Like all bumble bees, the American Bumble Bee has an annual life cycle. Like all bumble bees, American Bumble Bee queens overwinter underground and in decomposing organic material such as rotting logs and compost. It predominantly nests above ground in dense mats of long grass, but is also known to opportunistically nest in abandoned rodent burrows and abandoned bird nests well above the ground surface. It has been recorded foraging on flowers for pollen and nectar from a variety of plant genera. The American Bumble Bee occurs in a range of open habitats including farmlands, meadows and grasslands. Ontario and Québec represent the northern edge of its distribution, and approximately 7.1% of its global range for the subspecies pensylvanicus 2.3% for the species. The American Bumble Bee occurs throughout much of southern North America from southern Canada, throughout the United States to Mexico. The American Bumble Bee is an important pollinator of a variety of plant species. Males have longer antennae than females, with a predominantly yellow abdomen with an orange tip. The distinctive dark wings and characteristic yellow and black abdominal banding pattern of females are diagnostic, and consistent throughout its Canadian range. The American Bumble Bee ( Bombus pensylvanicus) is a medium-sized bumble bee with a relatively long head and tongue length compared to many other bumble bee species in Canada. Wildlife species description and significance Également disponible en français sous le titre Évaluation et Rapport de situation du COSEPAC Bourdon américain sur le ( Bombus pensylvanicus) au Canada.Ĭover illustration/photo: American Bumble Bee provided by Thom Wilson of Baltimore City, MD, USA.ĬOSEWIC executive summary American Bumble Bee Paul Grant, COSEWIC Arthropods Specialist Subcommittee Co-chair. This report was overseen and edited by Dr. Production note: COSEWIC would like to acknowledge Cory Sheffield for writing the status report on American Bumble Bee, Bombus pensylvanicus, prepared under contract with Environment and Climate Change Canada. Committee on the Status of Endangered Wildlife in Canada. COSEWIC assessment and status report on the American Bumble Bee Bombus pensylvanicus in Canada. This report may be cited as follows:ĬOSEWIC. COSEWIC status reports are working documents used in assigning the status of wildlife species suspected of being at risk. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |