2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 9:30 AM - 9:45 AM | DECLINES IN AERIAL INSECTIVOROUS BIRDS LINKED TO NATIONAL TRENDS IN WATER QUALITY | 330 B
DECLINES IN AERIAL INSECTIVOROUS BIRDS LINKED TO NATIONAL TRENDS IN WATER QUALITY
Changes in flying insect prey have been implicated in population declines of North American aerial insectivorous birds. Emergent aquatic insects can be an important prey resource for many species within this guild, and might be expected to be strongly impacted by deteriorating water quality. We synthesized trends in water quality, land use and climate, and benthic-macroinvertebrate data and related these to aerial insectivorous bird populations (1970-2011) across the United States. We found negative effects of road density, % sand and fines, and total phosphorus on the proportion of the macroinvertebrate community with an emerging adult life stage. Further, the odds that a given individual macroinvertebrate was from a non-emergent taxon increased 3.5× as a function of pollution tolerance values. Multiple aerial insectivorous bird species showed positive trends with the relative abundance of emergent macroinvertebrates, particularly riparian species such as Purple Martin (Progne subis), Willow Flycatcher (Empidonax traillii), and Northern Rough-Winged Swallow (Stelgidopteryx serripennis), and these relationships tended to be stronger east of the Rocky Mountains. Our findings suggest that the effects of water quality can extend into terrestrial ecosystems, influencing terrestrial consumer populations of significant conservation concern.
- Aquatic-terrestrial Linkage
- Landscape
- Invertebrate
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Presenters/Authors
David W. P. Manning
(), The Ohio State University, manning.413@osu.edu;
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S. Mažeika Patricio Sulliván
(), The Ohio State University, sullivan.191@osu.edu;
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