Journal
MOLECULAR ECOLOGY
Volume 23, Issue 21, Pages 5366-5377Publisher
WILEY
DOI: 10.1111/mec.12927
Keywords
foraging; Perca flavescens; recruitment; stomach content DNA; survival; turbidity
Funding
- Great Lakes Fishery Commission's Fisheries Research Program
- Ontario Ministry of Natural Resources
- Natural Sciences and Engineering Research Council of Canada
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Turbidity associated with river plumes is known to affect the search ability of visual predators and thus can drive top-down' impacts on prey populations in complex ecosystems; however, traditional quantification of predator-prey relationships (i.e. stomach content analysis) often fails with larval fish due to rapid digestion rates. Herein, we use novel molecular genetic methods to quantify larval yellow perch (YP) in predator stomachs in western Lake Erie to test the hypothesis that turbidity drives variation in larval predation. We characterize predator stomach content DNA to first identify YP DNA (single nucleotide polymorphism) and then quantify larval YP predation (microsatellite allele counting) in two river plumes differing in turbidity. Our results showed elevated larval YP predation in the less turbid river plume, consistent with a top-down impact of turbidity on larval survival. Our analyses highlight novel ecological hypothesis testing using the power of innovative molecular genetic approaches.
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