Which species is frequently cited as a major host for Bombus fernaldii in the northeastern United States?
Answer
*Bombus impatiens*
The success of *B. fernaldii* is heavily dependent on the availability of specific host species. Among the most commonly recorded hosts are the Common Eastern Bumblebee, designated as *Bombus impatiens*, and the Two-spotted Bumblebee (*Bombus bimaculatus*). Specifically within the northeastern United States, the presence and reproductive success of *B. fernaldii* populations are almost invariably linked to the existing populations and available nests of *Bombus impatiens*, highlighting a tight ecological dependency.
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