2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/07/2017 | 9:15 AM - 9:30 AM | GEOMORPHOLOGIC DRIVERS OF MACROINVERTEBRATE COMMUNITY STRUCTURE AND PRODUCTION IN TWO CONTRASTING LARGE RIVERSCAPES | 302B
GEOMORPHOLOGIC DRIVERS OF MACROINVERTEBRATE COMMUNITY STRUCTURE AND PRODUCTION IN TWO CONTRASTING LARGE RIVERSCAPES
Understanding the interaction between geomorphology and ecosystem processes is a central theme in ecology. Although there is a rich history of linking variation in habitat features to biota in small streams, these connections are poorly understood in large riverscapes. Recent studies suggest that both in-channel and external habitat-forming processes are important in large rivers. However, research is needed to (a) understand how these processes differentially generate patterns of benthic habitat, and (b) scale to influence macroinvertebrate productivity. We combined benthic habitat maps, aerial photography, and benthic sampling to explore linkages between geomorphology and secondary production at multiple scales in the Missouri (regulated) and Yellowstone (largely free-flowing) rivers in Montana, USA. We found that interactions between the river and surrounding landforms generate a mosaic of stable habitat patches that positively influence macroinvertebrate diversity and production. Further, impoundment led to a reduction in downstream off-channel habitats and larger sediment size through channel degradation, resulting in a highly productive, species-poor community. Elucidating connections between geomorphology and ecological processes will help predict how habitat alteration will influence productivity in large rivers.
- C06 Large River Ecology
- C03 Invertebrates
- C32 Primary and Secondary Production
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Presenters/Authors
Eric Scholl
(), Montana State University, escholl86@gmail.com ;
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Wyatt Cross
(), Montana State University, wyatt.cross@montana.edu ;
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Addie Dutton
(), Montana Cooperative Fishery Research Unit, Montana State University , adeline.dutton@msu.montana.edu;
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Christopher Guy
(), U.S. Geological Survey, Montana Cooperative Fishery Research Unit, Montana State University, cguy@montana.edu;
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