Predator-Induced Defense: Variation for Inducibility in an Intertidal Barnacle
2000; Wiley; Volume: 81; Issue: 5 Linguagem: Inglês
10.2307/177204
ISSN1939-9170
AutoresCurtis M. Lively, Wade N. Hazel, Melissa J. Schellenberger, Kristen S. Michelson,
Tópico(s)Marine and coastal plant biology
ResumoEcologyVolume 81, Issue 5 p. 1240-1247 Article PREDATOR-INDUCED DEFENSE: VARIATION FOR INDUCIBILITY IN AN INTERTIDAL BARNACLE Curtis M. Lively, Curtis M. Lively Department of Biology, Indiana University, Bloomington, Indiana 47405, USA E-mail: [email protected] Order determined by rock–paper–scissors game.Search for more papers by this authorWade N. Hazel, Wade N. Hazel Department of Biological Sciences, DePauw University, Greencastle, Indiana 46135, USA Order determined by rock–paper–scissors game.Search for more papers by this authorMelissa J. Schellenberger, Melissa J. Schellenberger Department of Biological Sciences, DePauw University, Greencastle, Indiana 46135, USASearch for more papers by this authorKristen S. Michelson, Kristen S. Michelson Department of Biology, Indiana University, Bloomington, Indiana 47405, USASearch for more papers by this author Curtis M. Lively, Curtis M. Lively Department of Biology, Indiana University, Bloomington, Indiana 47405, USA E-mail: [email protected] Order determined by rock–paper–scissors game.Search for more papers by this authorWade N. Hazel, Wade N. Hazel Department of Biological Sciences, DePauw University, Greencastle, Indiana 46135, USA Order determined by rock–paper–scissors game.Search for more papers by this authorMelissa J. Schellenberger, Melissa J. Schellenberger Department of Biological Sciences, DePauw University, Greencastle, Indiana 46135, USASearch for more papers by this authorKristen S. Michelson, Kristen S. Michelson Department of Biology, Indiana University, Bloomington, Indiana 47405, USASearch for more papers by this author First published: 01 May 2000 https://doi.org/10.1890/0012-9658(2000)081[1240:PIDVFI]2.0.CO;2Citations: 50 E-mail: [email protected] Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Phenotypic plasticity is a widespread and often adaptive feature of organisms living in heterogeneous environments. The advantages of plasticity seem particularly clear in organisms that show environmentally cued switches between alternative morphs. Information concerning the presence and nature of variation underlying the induction of these morphs, especially under field conditions, would be valuable. Here we examined the basis for variation underlying a predator-induced defense in an intertidal barnacle (Chthamalus anisopoma). In a previous experiment, juvenile barnacles were exposed to a predatory gastropod (Acanthina angelica). Some of these individuals were induced to develop as a predation-resistant form, but other individuals developed as the default, undefended morph. Here we tested two alternative explanations for this observation. One, the "continuous-sensitivity" model, holds that there is normally distributed genetic variation for sensitivity to the cue. This model predicts that, given sufficient exposure to the predator, all individuals would develop as the induced form; it suggests that the previous findings resulted from an insufficient dose of the cue. The second model, the "discontinuous-sensitivity" model, asserts that there is a genetic polymorphism for inducibility such that some individuals are not able to respond to the cue. This model suggests that, with repeated exposures to the predator, the resulting dose–response curve would reach an asymptote at <100%. We conducted a dose–response experiment in order to contrast these two alternatives, and to examine an expectation generated by life-history theory, namely, that repeated exposure to the predator would induce maturity at a younger age. 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