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Intraspecific variation in a predator affects community structure and cascading trophic interactions.

dc.contributor.author Post, DM
dc.contributor.author Palkovacs, EP
dc.contributor.author Schielke, EG
dc.contributor.author Dodson, SI
dc.coverage.spatial United States
dc.date.accessioned 2013-04-16T16:51:34Z
dc.date.issued 2008-07
dc.identifier https://www.ncbi.nlm.nih.gov/pubmed/18705387
dc.identifier.issn 0012-9658
dc.identifier.uri https://hdl.handle.net/10161/6541
dc.description.abstract Intraspecific phenotypic variation in ecologically important traits is widespread and important for evolutionary processes, but its effects on community and ecosystem processes are poorly understood. We use life history differences among populations of alewives, Alosa pseudoharengus, to test the effects of intraspecific phenotypic variation in a predator on pelagic zooplankton community structure and the strength of cascading trophic interactions. We focus on the effects of differences in (1) the duration of residence in fresh water (either seasonal or year-round) and (2) differences in foraging morphology, both of which may strongly influence interactions between alewives and their prey. We measured zooplankton community structure, algal biomass, and spring total phosphorus in lakes that contained landlocked, anadromous, or no alewives. Both the duration of residence and the intraspecific variation in foraging morphology strongly influenced zooplankton community structure. Lakes with landlocked alewives had small-bodied zooplankton year-round, and lakes with no alewives had large-bodied zooplankton year-round. In contrast, zooplankton communities in lakes with anadromous alewives cycled between large-bodied zooplankton in the winter and spring and small-bodied zooplankton in the summer. In summer, differences in feeding morphology of alewives caused zooplankton biomass to be lower and body size to be smaller in lakes with anadromous alewives than in lakes with landlocked alewives. Furthermore, intraspecific variation altered the strength of the trophic cascade caused by alewives. Our results demonstrate that intraspecific phenotypic variation of predators can regulate community structure and ecosystem processes by modifying the form and strength of complex trophic interactions.
dc.language eng
dc.publisher Wiley
dc.relation.ispartof Ecology
dc.subject Animals
dc.subject Connecticut
dc.subject Fishes
dc.subject Food Chain
dc.subject Fresh Water
dc.subject Predatory Behavior
dc.subject Seawater
dc.subject Zooplankton
dc.title Intraspecific variation in a predator affects community structure and cascading trophic interactions.
dc.type Journal article
duke.contributor.id Palkovacs, EP|0513338
pubs.author-url https://www.ncbi.nlm.nih.gov/pubmed/18705387
pubs.begin-page 2019
pubs.end-page 2032
pubs.issue 7
pubs.organisational-group Duke
pubs.organisational-group Marine Science and Conservation
pubs.organisational-group Nicholas School of the Environment
pubs.publication-status Published
pubs.volume 89


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