Bombus Species Comparisons

When comparing all three distribution models (each based on historical data from 2006 and earlier, aligning with the last known observation of Bombus franklini), the extreme range restriction of Franklin’s bumblebee becomes apparent. The Western bumblebee (Bombus occidentalis) also shows a relatively limited range, though its distribution is much more widespread than Franklin’s. In contrast, the Yellow-faced bumblebee (Bombus vosnesenskii) occupies a broad area of highly suitable habitat. This stark contrast further demonstrates how restricted the suitable habitat is for both Franklin’s and Western bumblebees. 

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