Maturation trends indicative of rapid evolution preceded the collapse of northern cod

被引:636
作者
Olsen, EM
Heino, M
Lilly, GR
Morgan, MJ
Brattey, J
Ernande, B
Dieckmann, U
机构
[1] Int Inst Appl Syst Anal, Adapt Dynam Network, A-2361 Laxenburg, Austria
[2] Inst Marine Res, N-5817 Bergen, Norway
[3] Fisheries & Oceans Canada, Dept Fisheries & Oceans, St John, NF A1C 5X1, Canada
基金
奥地利科学基金会;
关键词
D O I
10.1038/nature02430
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Northern cod, comprising populations of Atlantic cod ( Gadus morhua) off southern Labrador and eastern Newfoundland, supported major fisheries for hundreds of years(1). But in the late 1980s and early 1990s, northern cod underwent one of the worst collapses in the history of fisheries(2-4). The Canadian government closed the directed fishing for northern cod in July 1992, but even after a decade-long offshore moratorium, population sizes remain historically low(4). Here we show that, up until the moratorium, the life history of northern cod continually shifted towards maturation at earlier ages and smaller sizes. Because confounding effects of mortality changes and growth-mediated phenotypic plasticity are accounted for in our analyses, this finding strongly suggests fisheries-induced evolution of maturation patterns in the direction predicted by theory(5,6). We propose that fisheries managers could use the method described here as a tool to provide warning signals about changes in life history before more overt evidence of population decline becomes manifest.
引用
收藏
页码:932 / 935
页数:4
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