2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | EVALUATING ECOTONE-ASSOCIATED SHIFTS IN FOREST TYPE AND IN-STREAM HABITAT ON MACROINVERTEBRATE FUNCTIONAL FEEDING GROUPS | Virtual Platform
EVALUATING ECOTONE-ASSOCIATED SHIFTS IN FOREST TYPE AND IN-STREAM HABITAT ON MACROINVERTEBRATE FUNCTIONAL FEEDING GROUPS
Physiographic ecotones are associated with shifts in geology, forest type, and anthropogenic land use, which may facilitate shifts in macroinvertebrate functional feeding groups (FFGs) in streams that traverse these boundaries. Although the ecology of these groups is well-studied in non-ecotonal regions, little is known of how these communities respond to changes in forest type, in-stream habitat, and biogeochemical processes associated with ecotones. Within a multi-model framework, we evaluated the effects of these variables on the relative abundance of shredder, collector, and scraper FFGs along a southeastern USA Piedmont-Sandhills ecotone representing a shift in deciduous to coniferous forest and change in hydrology. We found that shredder composition was best predicted by forest type, while collector and scraper composition was best predicted by in-stream habitat. Shredders responded negatively to increasing mixed deciduous and coniferous forest, while collectors responded positively to increasing dissolved oxygen and riffle velocity and negatively to decreasing physical habitat score. Scrapers, alternatively, responded positively to both increasing riffle velocity and pH. Our results indicate that ecotones are important filters of macroinvertebrate functional diversity between physiographic provinces, which has important implications for energy flow and trophic relationships in stream habitats.
- Land use
- Ecosystem functioning
- Energy flows
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Presenters/Authors
Matthew Green
(), Clemson University , mwgreen@g.clemson.edu;
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John C. Morse
(), Clemson University, jmorse@clemson.edu;
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Nathan Arey
(), Louisiana State University, narey1@lsu.edu;
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Cathy Jachowski
(), Clemson University, cjachow@clemson.edu;
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