2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2019 | 12:15 PM - 12:30 PM | URBAN STREAM GEOMORPHIC CHARACTERISTICS STRONGLY INFLUENCE AQUATIC-TO-TERRESTRIAL SUBSIDIES AND FOOD-WEB STRUCTURE | 250 DE
URBAN STREAM GEOMORPHIC CHARACTERISTICS STRONGLY INFLUENCE AQUATIC-TO-TERRESTRIAL SUBSIDIES AND FOOD-WEB STRUCTURE
Aquatic-to-terrestrial fluxes of emergent aquatic insects provide quantitatively important nutritional subsidies to a suite of riparian terrestrial consumers. However, understanding of the mechanisms and controls underlying variability in these subsidies in altered ecosystems remains in the early stages. We investigated the effects of physical habitat (i.e., hydrogeomorphic) alteration on aquatic-terrestrial subsidies in 22 urban streams in the Columbus Metropolitan Area, Ohio, USA. We found that multiple stream hydromorphic features were associated with both fluxes of emergent insects and trophic dynamics of orb-weaving riparian spiders of the family Tetragnathidae. For example, diversity (H’) of emergent insects increased in higher gradient, higher power streams, presumably owing to the more heterogeneous habitat maintained by diverse flow regimes. Tetragnathid spiders were less reliant on aquatically-derived energy (i.e., energetic pathways derived from benthic algae) in incised streams, where stream channels were physically disconnected from their adjacent riparian zones. Further, spiders occupied lower trophic positions in larger streams with finer substrate. These results contribute to the growing body of literature linking stream geomorphic and ecological processes, and to a better understanding of mechanisms underlying aquatic-terrestrial food-webs in urban watersheds.
- Geomorphology
- Urban
- Subsidy
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Presenters/Authors
Leslie O. Rieck
(), The Ohio State University, rieck.6@osu.edu;
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S. Mažeika Patricio Sulliván
(), The Ohio State University, sullivan.191@osu.edu;
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