Endogenous biomarkers reveal diet partitioning among three sympatric species of swallows

Kaelyn Bumelis, Michael Cadman & Keith Hobson
Since the early 1990s, aerial insectivorous birds have shown serious population declines in North America, but it is not clear if factors common to all species within this guild account for these declines. Among sympatric swallows, population trends differ, and this may be due to differences in ecology operating throughout the annual cycle. Although these species all feed on aerial insects, prey taxa can differ tremendously in their “aeroecology” and use by swallows. We examined...
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