2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/26/2021 | 8:30 AM - 10:30 AM | REVERBERATING EFFECTS OF RESOURCE EXCHANGES IN STREAM-RIPARIAN FOOD WEBS | Virtual Platform

REVERBERATING EFFECTS OF RESOURCE EXCHANGES IN STREAM-RIPARIAN FOOD WEBS

Fluxes of materials or organisms across ecological boundaries directly affect recipient food webs. Few studies have addressed how such direct responses in one ecosystem may, in turn, influence the fluxes to other habitats. As part of a large-scale experiment, we evaluated the hypothesis that the input of a marine-derived subsidy results in a complex array of resource exchanges between stream and riparian ecosystems as responses disperse across ecological boundaries. We found that salmon carcasses altered stream-riparian food webs by directly subsidizing multiple aquatic and terrestrial organisms (e.g., benthic insects, fish, terrestrial flies). Such responses further influenced food webs along indirect pathways, some of which spanned land and water. Subsidy-mediated feedbacks manifested when carcasses were removed to riparian habitats where they were colonized by carrion flies, some of which fell into the stream and acted as another prey subsidy for fishes. As the effects of salmon subsidies propagated through the stream-riparian food web, the sign of consumer responses was not always positive and appeared to be determined by the outcome of trophic interactions, such that localized trophic interactions within one ecosystem mediated the export of organisms to others.

Aquatic–terrestrial biodiversity
Facilitation
Meta-ecosystems

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Presenters/Authors

Scott Collins (), Texas Tech University, Scott.Collins@ttu.edu;