2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/22/2018 | 3:15 PM - 3:30 PM | RIVERS IN FLUX: HYDROPSYCHE (TRICHOPTERA: HYDROPSYCHIDAE) DISTRIBUTION ALONG A LARGE RIVER DISCONTINUUM | 310 A

RIVERS IN FLUX: HYDROPSYCHE (TRICHOPTERA: HYDROPSYCHIDAE) DISTRIBUTION ALONG A LARGE RIVER DISCONTINUUM

Dams that are managed for maximizing hydroelectric yields release fluctuating downstream flows that produce freshwater “intertidal zones” along river corridors, creating unfavorable habitat for aquatic invertebrates that lay eggs along river banks. We predicted that net-spinning caddisflies (Trichoptera: Hydropsychidae: Hydropsyche) would be minimally affected by fluctuating flows because adult females have been observed to oviposit at depths of 4 m. We collaborated with citizen scientists for two years to sample for caddisflies using light traps along six large rivers in the Colorado River Basin in the southwestern United States, and identified and described the distribution of 17,266 Hydropsyche individuals across six species. We used a multi-model approach to describe the occupancy, abundance, and morphological swimming adaptations of the three dominant species relative to mean daily change in stage height and other environmental variables. Contrary to our expectations, we found no correlation between individual morphology and stage change and that Hydropsyche populations were indeed vulnerable to stage change fluctuations. Our results provide insight into the unique roles of hydrology, temperature, and life history in determining species-specific distributions on a river network scale.

Hydropower
Invertebrate
Flow

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Presenters/Authors

Anya Metcalfe (), USGS, ametcalfe@usgs.gov;