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A local replacement of Bombus ternarius by Bombus terricola in northern Wisconsin (Hymenoptera: Apidae)


, : A local replacement of Bombus ternarius by Bombus terricola in northern Wisconsin (Hymenoptera: Apidae). Great Lakes Entomologist, 112: 101-103

During hawkweed (Hieracium aurantiacum and H. florentinum) pollination studies in Vilas County, northern Wisconsin, USA, it was observed that B. ternarius decreased over the years, while B. terricola became more abundant. From 1973 to 1976 numbers of B. ternarius caught annually on hawkweed were 29, 22, 16, 1; numbers of B. terricola were 61, 42, 80, 70.

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