4.7 Article

Novel molecular approach demonstrates that turbid river plumes reduce predation mortality on larval fish

期刊

MOLECULAR ECOLOGY
卷 23, 期 21, 页码 5366-5377

出版社

WILEY
DOI: 10.1111/mec.12927

关键词

foraging; Perca flavescens; recruitment; stomach content DNA; survival; turbidity

资金

  1. Great Lakes Fishery Commission's Fisheries Research Program
  2. Ontario Ministry of Natural Resources
  3. 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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