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Predator‐induced phenotypic plasticity in Daphnia pulex: Life history and morphological responses to Notonecta and Chaoborus
Author(s) -
Black A. Ross
Publication year - 1993
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1993.38.5.0986
Subject(s) - daphnia pulex , biology , daphnia , phenotypic plasticity , pulex , predator , ecology , zoology , predation , branchiopoda , microcosm , cladocera , population , zooplankton , demography , sociology
Results from a laboratory life‐table study show Daphnia pulex has a unique set of rapidly induced responses to waterborne chemicals from each of two predator species. Additionally, Daphnia exhibits a unique set of induced responses when simultaneously exposed to both predators. Daphnids possessed neck teeth and experienced delayed maturity when exposed to waterborne chemicals released from larvae of the phantom midge Chaoborus americanus. Possessing the Chaoborus ‐induced phenotypic plasticity was not associated with a lower population growth rate relative to that in the control treatment. When exposed to waterborne chemicals released from the backswimmer Notonecta undulata , D. pulex exhibited an unexpected assemblage of responses. The Notonecta ‐induced phenotypic plasticity included rapid juvenile growth to a large size at first reproduction, little growth beyond maturity, and high reproductive output. Simultaneous exposure to chemical cues from Notonecta and Chaoborus resulted in a life history and morphologies that agreed with predicted life history and morphological responses of Daphnia that had been simultaneously exposed to large‐ and small‐size selective predators.