A systematic overview of harvesting-induced maturation evolution in predator-prey systems with three different life-history tradeoffs

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IR-12-022.pdf

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IR-12-022.pdf

http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/13645 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/13645 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/13645 archive 351 disk0/00/01/02/53 2016-01-15 08:48:13 2021-08-27 17:23:00 2016-01-15 08:48:13 monograph show 3 Bodin M. 1881 Brännström Å. 8085 Dieckmann U. 1668 0000-0001-7089-0393 A systematic overview of harvesting-induced maturation evolution in predator-prey systems with three different life-history tradeoffs pub iis_ecl prog_eep There are concerns that anthropogenic harvesting may cause phenotypic adaptive changes in exploited wild populations, in particular maturation at smaller size and younger age. In this paper, we study the evolutionarily stable size-at- maturation of prey subjected to size-selective harvesting in a simple predator-prey model, taking into account three recognized life-history costs of early maturation, namely reduced fecundity, reduced growth, and increased mortality. Our analysis shows that harvesting large individuals favors maturation at smaller size compared to the unharvested system, independent of life-history tradeoff and the predator.s prey-size preference. In general, however, the evolutionarily stable maturation size can either increase or decrease relative to the unharvested system, depending on the harvesting regime, the life-history tradeoff, and the predator's preferred size of prey. Furthermore, we examine how the predator population size changes in response to adaptive change in size-at-maturation of the prey. Surprisingly, in some situations we find that the evolutionarily stable maturation size under harvesting is associated with an increased predator population size. This occurs, in particular, when early maturation trades off with growth rate. In total, we determine the evolutionarily stable size-at-maturation and associated predator population size for a total of forty-five different combinations of tradeoff, harvest regime, and predated size class. 2012 published IR-12-022 IR-12-022 1161 39 66 public interim_report IIASA, Laxenburg, Austria 22 FALSE info:eu-repo/semantics/book