Maturation of Newfoundland American Plaice (Hippoglosoides platessoides): Long-term Trends in Maturation Reaction Norms despite Low Fishing Mortality?

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IR-05-015.pdf

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IR-05-015.pdf

http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/5174 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/5174 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/5174 archive 351 disk0/00/00/78/20 2016-01-15 02:18:53 2021-08-27 17:19:20 2016-01-15 02:18:53 monograph show 3 Barot S. 1739 Heino M. 7602 0000-0003-2928-3940 Morgan M.J. Dieckmann U. 1668 0000-0001-7089-0393 Maturation of Newfoundland American Plaice (Hippoglosoides platessoides): Long-term Trends in Maturation Reaction Norms despite Low Fishing Mortality? pub iis_ecl prog_adn American plaice; Logistic regression; Maturation dynamics; Maturity ogive; Probability of maturing; Reaction norm To interpret long-term trends in age and size at maturation, new statistical methods have recently been devised for estimating probabilistic maturation reaction norms based on data collected for the management of fisheries. Here we apply these methods to three Newfoundland stocks of American plaice (NAFO Divisions 2J3K, 3LNO, 3Ps) and report a clear long-term shift in the maturation reaction norms of these stocks towards maturation at younger age and smaller size. Theory predicts such trends could result from fishing acting as a selective force, inducing evolutionary changes in the life histories of exploited populations. Matching long-term trends in maturation reaction norms have already been documented for several stocks that have experienced high fishing pressures (Gulf of Maine and Georges Bank cod, Northeast Arctic cod, North Sea plaice). Our results add a new dimension to these earlier findings: since fishing pressures for two stocks of Newfoundland plaice (2J3K and 3Ps) have been relatively low, our results imply that fishing is likely to result in the evolution of life histories even when fishing mortality is low, or that natural mortality has played an important role in determining selective pressures in these populations. Both options suggest that conditions for rapid life-history evolution in exploited stocks are less restrictive than previously appreciated. 2005-03 published IR-05-015 IR-05-015 1141 122 66 public interim_report IIASA, Laxenburg, Austria 24 FALSE info:eu-repo/semantics/book