Harvest-induced maturation evolution under different life-history trade-offs and harvesting regimes

Poos JJ, Brannstrom A, & Dieckmann U (2011). Harvest-induced maturation evolution under different life-history trade-offs and harvesting regimes. Journal of Theoretical Biology 279 (1): 102-112. DOI:10.1016/j.jtbi.2011.03.001.

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Abstract

The potential of harvesting to induce adaptive changes in exploited populations is now increasingly recognized. While early studies predicted that elevated mortalities among larger individuals select for reduced maturation size, recent theoretical studies have shown conditions under which other, more complex evolutionary responses to size-selective mortality are expected. These new predictions are based on the assumption that, owing to the trade-off between growth and reproduction, earlier maturation implies reduced growth. Here we extend these findings by analyzing a model of a harvested size-structured population in continuous time, and by systematically exploring maturation evolution under all three traditionally acknowledged costs of early maturation: reduced fecundity, reduced growth, and/or increased natural mortality. We further extend this analysis to the two main types of harvest selectivity, with an individual's chance of getting harvested depending on its size and/or maturity stage. Surprisingly, we find that harvesting mature individuals not only favors late maturation when the costs of early maturation are low, but promotes early maturation when the costs of early maturation are high. To our knowledge, this study therefore is the first to show that harvesting mature individuals can induce early maturation.

Item Type: Article
Uncontrolled Keywords: Fisheries-induced evolution; Adaptive dynamics; Size structure; Harvesting; Life-history trade-offs
Research Programs: Evolution and Ecology (EEP)
Bibliographic Reference: Journal of Theoretical Biology; 279(1):102-112 (21 June 2011) (Published online 8 March 2011)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:45
Last Modified: 24 Feb 2016 15:15
URI: http://pure.iiasa.ac.at/9624

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