2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 11:00 AM - 11:15 AM | THE INFLUENCE OF RIVER ALTERATION ON SALMONFLY EMERGENCE PHENOLOGY | 320
THE INFLUENCE OF RIVER ALTERATION ON SALMONFLY EMERGENCE PHENOLOGY
River alteration through impoundment, land-use changes, and development modifies water temperature regimes, which can in turn alter the duration, magnitude, and spatial patterning of resource pulses. We examine how human alteration and corresponding changes in thermal regime influence the emergence phenology of a large aquatic insect, the salmonfly (Pteronarcys californica), on two rivers of contrasting human activity in southwest Montana. On the Madison River, which is impounded and flows through an agricultural valley, water temperatures transition gradually along a gradient from cool upstream to warm downstream sites. In response, emergence moves in a predictable wave propagating downstream to upstream (Peak emergence ~ River mile: R2=0.96). In contrast, water temperature is discontinuous along a downstream-upstream gradient on the free-flowing, forested Gallatin River. The resultant emergence occurs less sequentially, with emergence at certain upstream sites occurring simultaneously or previous to emergence at downstream sites (Peak emergence ~ River mile: R2=0.35). Emergence duration also differed, lasting 30% longer on the Gallatin River. Future work will investigate how variations in salmonfly emergence duration and spatial patterning influence mobile and immobile consumers’ ability to utilize and track this resource pulse over space and time.
- Temperature
- Spatial
- Disturbance
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Presenters/Authors
Heidi Anderson
(), Montana State University, heidieliseanderson@gmail.com;
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Lindsey Albertson
(), Montana State University, lalbertson@stroudcenter.org;
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