2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/26/2021 | 8:30 AM - 10:30 AM | ACCELERATING THE RECOVERY OF STREAM INSECTS IN RESTORED STREAMS BY ENHANCING THE EGG-LAYING HABITAT FOR ADULT STREAM INSECTS | Virtual Platform
ACCELERATING THE RECOVERY OF STREAM INSECTS IN RESTORED STREAMS BY ENHANCING THE EGG-LAYING HABITAT FOR ADULT STREAM INSECTS
Physical habitats for larval insects are improved by stream restoration, however, habitats for adult aquatic insects are often overlooked in restoration designs. We hypothesized that limited availability of suitable rocks for egg-laying restricts egg recruitment of aquatic insects in restored streams, thus contributing to the lag in their recovery. In 2019, we quantified the abundance of rocks suitable for egg-laying and the number of egg masses attached to rocks in multiple restored and reference streams in western North Carolina. Rocks were 90 % more abundant in reference than restored streams. Surprisingly, rocks that rolled or were unrecoverable was 91 % higher in restored than reference streams. Egg masses were more aggregated on rocks in restored than reference streams. In 2020, we added rocks to five restored sites and did not manipulate five other restored streams. Adding rocks increased the average number of rocks by 193% and egg mass abundance by 106% compared to untreated restored streams These results suggest that the availability and stability of egg-laying substrates are limiting insect recruitment and that including egg-laying substrates in project designs could be an approach to accelerate insect recovery in restored streams.
- Stream restoration
- Geomorphology
- Habitat
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Presenters/Authors
Samantha Jordt
(), North Carolina State University , samanthajordt@gmail.com;
ASHA DISCLOSURE:
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Brad Taylor
(), North Carolina State University Dept. of Applied Ecology; Rocky Mountain Biological Laboratory, bwtaylo3@ncsu.edu ;
ASHA DISCLOSURE:
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Nonfinancial -