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- W2028331489 abstract "More than 3000 prey representing 108 species of bees and wasps were identified from exoskeletal remains taken from nests of the beewolf Philanthus sanbornii at a site in eastern Massachusetts over a period of five years. Quantitative reference samples totalling more than 4000 items were collected from flowers at the same site over a period of four years. These data give a uniquely detailed view of the way in which a generalist predator exploits a diverse prey community. Most species show striking year-to-year variation in relative abundance, in both the prey and reference collections, but the overall abundances of species tend to be similar in the two collections, as do their sex ratios. This shows: (i) that P. sanbornii takes virtually every bee and wasp species found at flowers during its flight season (except for the relatively small number of species too large to handle); (ii) that prey are taken at rates roughly proportional to their local abundances (with a few exceptions); and (iii) that the local bee and wasp communities have lively dynamics (at least on spatial scales equivalent to the flight ranges of P. sanbornii females). Prey species are non-randomly distributed among nests of individual females within years, and among cells within nests, in a pattern suggesting that females often return repeatedly to hunting sites at which they have had success; the pattern does not suggest that individual females develop preferences for particular prey taxa. The size-abundance distributions of female bees appear to be trimodal at both the individual and species levels, most strongly so when cleptoparasitic species are removed from the sample. Such patterns are seen weakly or not at all in the size-abundance distributions of male bees, male wasps, and female wasps. Bees and wasps of both sexes visit flowers for nectar, but only non-parasitic female bees harvest pollen; this suggests that the multimodality may be caused by aspects of pollen collection that tend to scale with size. The seven Philanthus species of eastern North America vary greatly in size, but they share a common set of relatively small prey species. As in other parts of North America, larger species of Philanthus tend to have relatively broad diets because they also take larger prey that are not available to their smaller congeners. However, long-tongued bees appear to be under-represented in the diets of most North American Philanthus outside the zebratus species group." @default.
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- W2028331489 date "1993-03-29" @default.
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- W2028331489 title "Temporal, spatial, sex-ratio and body-size heterogeneity of prey species taken by the beewolf<i>Philanthus sanbornii</i>(Hymenoptera: Sphecidae)" @default.
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- W2028331489 doi "https://doi.org/10.1098/rstb.1993.0039" @default.
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