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Effects of potential predator and competitor cues and sibship on wood frog (Rana sylvatica) embryos

Effects of potential predator and competitor cues and sibship on wood frog (Rana sylvatica) embryos AbstractChemical cues emitted from predators or competitors are often important foranimals living in aquatic ecosystems as they allow potential prey to assesspredation risk and make appropriate risk-sensitive responses. In ourexperiment, we examined if wood frog (Rana sylvatica) embryos exposed topotential predator and competitor cues would alter their time to hatching,size at hatching, or survivorship. Eggs from four different sibships weresubjected to a variety of cues including dragonfly larvae (potential tadpolepredator), mosquitofish (Gambusia affinis; a non-native potential egg andtadpole predator), and overwintered tadpoles of Rana sp. (potentialcompetitors). We found no significant effects of any of the cues. However,we did find significant variation in mean time to hatching and meanhatchling size among sibships. Our results suggest that wood frog embryosmay have limited ability to respond to some cues at the embryonic stage, atleast for the concentrations and conditions used in this experiment. Ourresults do indicate genetic or parental effects can affect embryonic woodfrog development rate and hatchling size. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Amphibia-Reptilia Brill

Effects of potential predator and competitor cues and sibship on wood frog (Rana sylvatica) embryos

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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0173-5373
eISSN
1568-5381
DOI
10.1163/156853809788201144
Publisher site
See Article on Publisher Site

Abstract

AbstractChemical cues emitted from predators or competitors are often important foranimals living in aquatic ecosystems as they allow potential prey to assesspredation risk and make appropriate risk-sensitive responses. In ourexperiment, we examined if wood frog (Rana sylvatica) embryos exposed topotential predator and competitor cues would alter their time to hatching,size at hatching, or survivorship. Eggs from four different sibships weresubjected to a variety of cues including dragonfly larvae (potential tadpolepredator), mosquitofish (Gambusia affinis; a non-native potential egg andtadpole predator), and overwintered tadpoles of Rana sp. (potentialcompetitors). We found no significant effects of any of the cues. However,we did find significant variation in mean time to hatching and meanhatchling size among sibships. Our results suggest that wood frog embryosmay have limited ability to respond to some cues at the embryonic stage, atleast for the concentrations and conditions used in this experiment. Ourresults do indicate genetic or parental effects can affect embryonic woodfrog development rate and hatchling size.

Journal

Amphibia-Reptilia – Brill

Published: Jan 1, 2009

Keywords: SIBSHIPS; PLASTICITY; EGG PREDATOR; TIME TO HATCHING; TADPOLE PREDATOR; RANA SYLVATICA; HATCHLING MASS

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