2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2021 | 2:00 PM - 3:30 PM | The influence of terrestrial trophic cascades on stream temperature regimes | Virtual Platform

The influence of terrestrial trophic cascades on stream temperature regimes

Temperature is a fundamental control on ecological processes, and factors that alter thermal regimes can shift species interactions and ecosystem function. We compared thermal regimes of streams in Yellowstone National Park with contrasting degrees of ungulate browse, and, therefore, different amounts of woody riparian vegetation. Low vegetation density sites experience heavy riparian browse by bison (Bison bison), which are not currently limited by large carnivores. High vegetation density sites experience lower riparian browse by ungulates, partly due to restoration of large carnivores. We explored four aspects of summer temperature regime across five streams: daily-mean, daily-maximum, daily-range, and normalized daily temperature variation. Mean daily temperatures were not significantly correlated with streamside vegetation status. Two of three low vegetation streams had higher maximum temperatures than high-vegetation sites. Daily stream temperature range and normalized daily temperature variation, were significantly different between low- and high-vegetation sites. Daily ranges and normalized daily temperature variation were nearly twice as high in low vegetation sites as in high vegetation sites. Thus, preliminary results indicate terrestrial factors, including trophic cascades from predators, may alter stream temperature regimes, a key element controlling stream processes.

Stream
Monitoring
Ecohydrology

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Presenters/Authors

Keeley MacNeill (), Oregon State University, keeleymacneill@gmail.com;