2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | MACROINVERTEBRATE COMMUNITY STRUCTURE, SUBSTRATE COMPOSITION, AND GRAVEL AUGMENTATION IN AN IMPOUNDED OZARK STREAM | Virtual Platform
MACROINVERTEBRATE COMMUNITY STRUCTURE, SUBSTRATE COMPOSITION, AND GRAVEL AUGMENTATION IN AN IMPOUNDED OZARK STREAM
Aquatic macroinvertebrates are crucial components of stream food webs and links between aquatic and terrestrial systems. In stream ecosystems, macroinvertebrate community structure is shaped by physical conditions including discharge, temperature, and substrate. Dams normally impose disruptions to all three of these conditions, making it difficult to separate the effects of any one of them on macroinvertebrates. Downstream of a reservoir on Missouri’s East Fork Black River, however, only substrate conditions dramatically differ between upstream and downstream reaches. Here we examine macroinvertebrate community structure and physical conditions at five riffles four sampling seasons. Sampling occurred in Fall 2017, Spring and Fall 2018, and Spring 2019. Substrate composition, flow velocity, and water depth show clear longitudinal trends. Preliminary results suggest macroinvertebrate abundance has a similar relationship, and there are clear seasonal and longitudinal differences in abundance among certain taxa. Substrate augmentation projects are aimed at providing conditions for desired macroinvertebrate and/or fish communities. The East Fork is a site for previous and future substrate augmentations; this study will inform what ratios of substrate sizes may be most beneficial for desired macroinvertebrate community structures and at what time of year to deliver them.
- Ecosystem
- Habitat
- Restoration
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Presenters/Authors
Garrett Frandson
(), University of Missouri, gfdh4@umsystem.edu;
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Brett Landwer
(), Missouri Department of Conservation, brett.landwer@mdc.mo.gov;
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Alba Argerich
(), School of Natural Resources, University of Missouri, argericha@missouri.edu;
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