description Bombus variabilis Overview
Bombus variabilis is a species of cuckoo bumblebee native to North America, placed in the subgenus Psithyrus. It is a social parasite that does not construct its own colony but instead invades the nests of other bumblebee species, relying on the host workers to rear its offspring. The species has experienced severe population declines and is now rarely recorded across much of its former range. It is of interest to entomologists and conservation biologists studying pollinator decline and parasitic bee behavior.
help Bombus variabilis FAQ
What is the defining behavior of the Bombus variabilis bee?
Bombus variabilis is a cuckoo bumblebee, meaning it does not build its own nests or collect pollen. Instead, the queen completely relies on the colonies of other bumblebee species to raise her young.
Why is Bombus variabilis considered a rare bee?
The species has experienced heavily declining populations across North America in recent decades. It is currently listed as critically imperiled or possibly extinct in many of its historical native ranges.
How does the Bombus variabilis queen take over a host colony?
The queen will invade the nest of a host bumblebee, kill the resident queen, and subdue the workers. She then lays her own eggs, forcing the host workers to feed and care for her offspring.
Where was the Bombus variabilis historically found?
This bee was historically native to various parts of North America, particularly the eastern United States. It specifically targets the nests of the American bumblebee to reproduce.
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