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 | Community stability in stream networks: Experimentally disentangling the roles of dispersal mode and network position | Virtual Platform

Community stability in stream networks: Experimentally disentangling the roles of dispersal mode and network position

Community assembly may vary across stream networks due to differences in environmental filtering and regional processes, such as dispersal. Stream insect dispersal varies by mode, and this variability may affect the recovery of streams at the local and network scale. To examine the effect of different dispersal modes on community assembly and stability, we conducted a field experiment using streamside flumes at Coweeta Hydrologic Lab. We built 18 flumes and divided them into four channels. Each channel received one dispersal treatment: aquatic drift only, aerial flight only, open to drift and aerial dispersal, and no drift and aerial dispersal. We completed the flumes in March 2019 and began sampling the channels in May. Following two initial sampling events, we applied a disturbance treatment across all of the flumes by raking the stream sediments and then continued to sample monthly. Preliminary data support two of our predictions: communities more central in the network are more stable than headwaters; and channels that received drift dispersal recover faster. These findings confirm community assembly and stability varies with dispersal mode and network location, which could improve restoration and management strategies in river networks.

Restoration
Stream
Stream restoration

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Presenters/Authors

Sara Cathey (), Virginia Tech, catheyse@vt.edu;