2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 9:00 AM - 9:15 AM | RIPARIAN CANOPY HERBIVORY STIMULATES BIOFILM AUTOTROPHY AND HETEROTROPHY IN LIGHT-LIMITED STREAMS | 301A
RIPARIAN CANOPY HERBIVORY STIMULATES BIOFILM AUTOTROPHY AND HETEROTROPHY IN LIGHT-LIMITED STREAMS
Western spruce budworms, the dominant defoliator of coniferous forests in western North America, subsidize forest canopy organic matter contributions to stream food webs. These subsidies leach compounds that contribute nutrients and/or dissolved organic matter for biofilm metabolism. We studied differences in biofilm activity in response to litter and frass leachate amendments under ambient and experimentally reduced light conditions. Regardless of light availability, heterotrophic respiration increased with frass leachate amendments expressed on an areal basis (P<<0.001), but respiration with frass and litter leachate inputs did not differ when expressed per unit biomass. Autotrophic production was higher under ambient light when expressed on an areal basis (P<<0.001), but frass or litter had no effect, suggesting that inorganic nutrients from leachates did not stimulate production. Leachates suppressed production on a biomass basis (P<<0.001), suggesting allelopathy from conifers and the possibility that leached coniferous organic matter could moderate increased autotrophy resulting from greater light availability through canopy thinning by herbivory. Results suggest that organic matter inputs to streams via budworm herbivory could alter trophic basis of production by stimulating respiratory activity in forested streams.
- C31 Organic Matter Processing
- C10 Biogeochemistry
- C28 Land-Water Interfaces & C29 Life Histories
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Presenters/Authors
Clay Arango
(), Central Washington University, arangoc@cwu.edu;
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Sally Entrekin
(), Virginia Tech, sallye@vt.edu;
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Jennifer Lipton
(), Central Washington University, liptonj@cwu.edu;
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