Impact of Environmental Covariation in Growth and Mortality on Evolving Maturation Reaction Norms

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IR-11-008.pdf

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IR-11-008.pdf

http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/13537 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/13537 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/13537 archive 351 disk0/00/00/98/26 2016-01-15 08:46:19 2021-08-27 17:22:19 2016-01-15 08:46:19 monograph show 3 Marty L. 8483 Dieckmann U. 1668 0000-0001-7089-0393 Rochet M-J. Ernande B. 7797 Impact of Environmental Covariation in Growth and Mortality on Evolving Maturation Reaction Norms pub iis_ecl prog_eep Maturation age and size have important fitness consequences through their effects on survival probabilities and body sizes. The evolution of maturation reaction norms in response to environmental covariation in growth and mortality is therefore a key subject of life-history theory. The eco-evolutionary model we present and analyze here incorporates critical features earlier studies of evolving maturation reaction norms have often neglected: the tradeoff between growth and reproduction, source-sink population structure, and population regulation through density-dependent growth and fecundity. We report the following findings. First, the evolutionarily optimal age at maturation can be decomposed into the sum of a density-dependent and a density-independent component. These components measure, respectively, the hypothetical negative age at which an individual's length would be zero and the delay in maturation relative to this offset. Second, along any growth trajectory, individuals mature earlier when mortality is higher. This allows us to deduce, third, how the shapes of evolutionarily optimal maturation reaction norms depend on the covariation between growth and mortality (positive or negative, linear or curvilinear, and deterministic or probabilistic). Providing eco-evolutionary explanations for many alternative reaction-norm shapes, our results appear to be in good agreement with current empirical knowledge on maturation dynamics. 2011-07 published IR-11-008 IR-11-008 1435 66 1238 public interim_report IIASA, Laxenburg, Austria 50 FALSE info:eu-repo/semantics/book