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It is widely agreed that in many parts of the world some bumblebee (Bombus) species have declined, and that this has often been driven by land-use changes that cause reductions in the abundance of food plants. There is much less agreement about how changes in food plants affect some bumblebee species more than others. We sought to identify which species'(More)
The phenology of many ecological processes is modulated by temperature, making them potentially sensitive to climate change. Mutualistic interactions may be especially vulnerable because of the potential for phenological mismatching if the species involved do not respond similarly to changes in temperature. Here we present an analysis of climate-associated(More)
For many species, geographical ranges are expanding toward the poles in response to climate change, while remaining stable along range edges nearest the equator. Using long-term observations across Europe and North America over 110 years, we tested for climate change-related range shifts in bumblebee species across the full extents of their latitudinal and(More)
14-41 Long-or square-cheeked bees with a rounded angle on the midleg 42-61 Short-cheeked bees with a rounded angle on the midleg 62-77 Long-cheeked bees with a sharp angle on the midleg 78-97 Bees with hindleg outer tibial surface convex and uniformly hairy (cuckoo bumble bees) Home bookshelves, school libraries, nature centers, and museum gift shops are(More)
Bumble bees are an important group of wild pollinators in North America and considerable concern has been expressed over declines in their populations. However, before causes for declines can be assessed, it is essential that the geographical and chronological patterns of decline be discovered. Hitherto a lack of assessment of historical data has hindered(More)
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