Rapid Divergence of Predator Functional Traits Affects Prey Composition in Aquatic Communities

Schmid, Dominik W.; Mc Gee, Matthew David; Best, Rebecca J.; Seehausen, Ole; Matthews, Blake (2019). Rapid Divergence of Predator Functional Traits Affects Prey Composition in Aquatic Communities. The American naturalist, 193(3), pp. 331-345. University of Chicago Press 10.1086/701784

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Identifying traits that underlie variation in individual performance of consumers (i.e., trait utility) can help reveal the ecological causes of population divergence and the subsequent consequences for species interactions and community structure. Here, we document a case of rapid divergence (over the past 100 generations, or ∼150 years) in foraging traits and feeding efficiency between a lake and stream population pair of threespine stickleback. Building on predictions from functional trait models of fish feeding, we analyzed foraging experiments with a Bayesian path analysis and elucidated the traits explaining variation in foraging performance and the species composition of ingested prey. Despite extensive previous research on the divergence of foraging traits among populations and ecotypes of stickleback, our results provide novel experimental evidence of trait utility for jaw protrusion, gill raker length, and gill raker spacing when foraging on a natural zooplankton assemblage. Furthermore, we discuss how these traits might contribute to the differential effects of lake and stream stickleback on their prey communities, observed in both laboratory and mesocosm conditions. More generally, our results illustrate how the rapid divergence of functional foraging traits of consumers can impact the biomass, species composition, and trophic structure of prey communities.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)

UniBE Contributor:

Mc Gee, Matthew David and Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

0003-0147

Publisher:

University of Chicago Press

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

02 Jul 2019 07:38

Last Modified:

29 Oct 2019 15:10

Publisher DOI:

10.1086/701784

PubMed ID:

30794448

BORIS DOI:

10.7892/boris.130296

URI:

https://boris.unibe.ch/id/eprint/130296

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