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The impact of intraspecific variation in a fish predator on the evolution of phenotypic plasticity and investment in sex in Daphnia ambigua
Author(s) -
WALSH M. R.,
POST D. M.
Publication year - 2012
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1111/j.1420-9101.2011.02403.x
Subject(s) - biology , intraspecific competition , daphnia , phenotypic plasticity , predator , fish <actinopterygii> , variation (astronomy) , zoology , ecology , evolutionary biology , predation , crustacean , fishery , physics , astrophysics
Theory predicts that the evolution of phenotypic plasticity depends upon cues that indicate environmental change. Predators typically induce plastic responses in prey. However, variation among populations of predators alters the frequency of predation and, possibly, the evolution of plasticity. We compared responses to predator cues in Daphnia ambigua from lakes where alewife ( Alosa pseudoharengus ) either do (anadromous) or do not (landlocked) migrate between marine and freshwater. In ‘anadromous’ lakes, Daphnia are abundant each spring but eliminated by alewives in summer, whereas Daphnia are constantly under the threat of predation in ‘landlocked’ lakes. Daphnia from ‘anadromous’ lakes grew faster, matured earlier and larger, produced more offspring and invested more in sex than Daphnia from landlocked lakes. We observed several significant lake type‐by‐predator treatment interactions. These interactions, whereby the differences between lakes were greater in predator‐conditioned water, agree with theory and argue that Daphnia plasticity has been influenced by variation in alewives.