2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 2:45 PM - 3:00 PM | SPATIAL AND TEMPORAL DRIVERS OF VARIATION IN FEEDING RATES OF A STREAM PREDATOR | 310 B
SPATIAL AND TEMPORAL DRIVERS OF VARIATION IN FEEDING RATES OF A STREAM PREDATOR
Species interaction strengths are recognized as being dynamic in time and space, yet few studies have quantified this variation or its drivers. We used an observational approach to estimate the prey-specific feeding rates of reticulate sculpin (Cottus perplexus) at nine stream sites over three seasons in western Oregon. Feeding rates varied across prey taxa by three orders of magnitude, varying less across seasons and sites for a given taxon than between prey taxa within a season or site. Of the 25 most common prey recovered from sculpin stomachs, feeding rates on seven taxa were best predicted by a model including site identity and season. The top model for seven other prey included only site, and for eleven taxa it included only season. Variation within prey taxa in feeding rates was driven by variation in both prey density and prey body sizes, with 19 of 25 taxa showing a positive power law (log-log) relationship between feeding rate and prey density. Our results highlight how spatial and temporal variation in prey demographics drive variation in the feeding rates of generalist predators.
- Population
- Diet
- Predator-prey
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Presenters/Authors
Dan Preston
(), Oregon State University, daniel.preston@oregonstate.edu;
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Landon Falke
(), Oregon State University, falkel@oregonstate.edu;
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Jeremy Henderson
(), Oregon State University, hendejer@onid.orst.edu;
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Mark Novak
(), Oregon State University, Mark.novak@oregonstate.edu;
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