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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/5164 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/5164 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/5164 archive 351 disk0/00/00/78/14 2016-01-15 02:18:49 2021-08-27 17:19:19 2016-01-15 02:18:49 monograph show 3 Olsen E.M. 1772 Lilly G.R. Heino M. 7602 0000-0003-2928-3940 Morgan M.J. Brattey J. Dieckmann U. 1668 0000-0001-7089-0393 pub iis_ecl prog_adn By estimating probabilistic reaction norms for age and size at maturation, we show that maturation schedules of Atlantic cod (Gadus morhua) off Labrador and Newfoundland shifted toward earlier ages and smaller sizes during the late 1980s and early 1990s, when these populations underwent a severe collapse in biomass and subsequently were closed for directed commercial fishing. We also demonstrate that this trend towards maturation at younger ages and smaller sizes is halted and even shows signs of reversal during the closure of the fisheries. In addition, our analysis reveals that males tend to mature earlier and at a smaller size than females, and that maturation age and size decreases with increasing latitude. Importantly, the maturation reaction norms presented here are robust to variation in survival and growth (through phenotypic pasticity), and are thus strongly indicative of rapid evolutionary changes in cod maturation, as well as of spatial and sex- specific genetic variation. We therefore suggest that maturation reaction norms can provide helpful reference points for managing harvested populations with evolving life-histories. 2005-03 published IR-05-021 IR-05-021 1490 122 66 public interim_report IIASA, Laxenburg, Austria 47 FALSE info:eu-repo/semantics/book