EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/05/2017 | 10:15 AM - 10:30 AM | HOW DOES HEMLOCK WOOLLY ADELGID INVASION AFFECT RIPARIAN CONSUMER TROPHIC DYNAMICS? | 301A
HOW DOES HEMLOCK WOOLLY ADELGID INVASION AFFECT RIPARIAN CONSUMER TROPHIC DYNAMICS?
Riparian invasive species can alter in-stream community structure and function, but their reciprocal effects across the aquatic-terrestrial boundary are less known. We investigated differences in riparian spider trophic dynamics associated with Hemlock Woolly Adelgid (HWA) in 21 Virginia (high invasion severity), West Virginia (moderate invasion), and Ohio (no invasion) headwater stream ravine systems. Isotopic signatures (?13C, ?15N) of Tetragnathidae indicated changes in trophic relationships across HWA invasion severity. Spider ?13C closely tracked emergent aquatic-insect ?13C at non-invaded sites, but this relationship was largely decoupled at sites with moderate invasion severity, suggesting a shift in riparian spider diet associated with HWA invasion. Two-source mixing models indicated that spider reliance on aquatic-derived nutritional subsidies (i.e., originating from periphyton) was slightly lower in sites with moderate to severe invasion. Spider trophic position also decreased in sites with moderate invasion. Both results imply possible shifts in basal-resource availability or changes in emergent-insect community structure following HWA invasion. Our results show that riparian invasion may have reciprocal impacts on cross-boundary energetic fluxes that influence trophic interactions of adjacent terrestrial consumers.
- C26 Invasive Species
- C25 Food Webs
- S14 Stressors in linked aquatic-terrestrial ecosystems: New developments and solutions
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Presenters/Authors
Kristen M. Diesburg
(), The Ohio State University, diesburg.1@osu.edu;
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S. Mažeika Patricio Sulliván
(), The Ohio State University, sullivan.191@osu.edu;
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David W. P. Manning
(), The Ohio State University, manning.413@osu.edu;
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