Changes in size at maturity of Fraser River sockeye salmon ( Oncorhynchus nerka ) (1952–1993) and associations with temperature
Changes in size at maturity of Fraser River sockeye salmon ( Oncorhynchus nerka ) (1952–1993) and associations with temperature
复制标题
弗雷泽河红鲑鱼(Oncorhynchus nerka)成熟时大小的变化(1952-1993)以及与温度的关系
DOI:
10.1139/f97-009
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发表时间:
1997
影响因子:
2.4
通讯作者:
S. Hinch
中科院分区:
文献类型:
--
作者:
S. Cox;S. Hinch
Unlike other Canadian Pacific salmon (Oncorhynchus spp.), long-term declines in the size at maturity of Fraser River sockeye salmon (O. nerka) have not been reported in past studies. Using data specific for 10 Fraser River sockeye stocks, we demonstrate that size at maturity has generally declined over the past 42 yr for females in all stocks and for males from eight stocks. Independent of this temporal trend, we found that size at maturity of both sexes in all stocks was smaller in years when sea surface temperatures were relatively warm. Slower growth in warmer years may be caused directly by increased metabolic demand, or indirectly by oceanic changes that influence food acquisition. We speculate that fitness of Fraser River sockeye will be reduced in the future if sea surface temperature increases and salmon abundance remains near present levels. Resume : Contrairement ‡ diautres saumons du Pacifique (Oncorhynchus spp.) canadiens, on nia pas signalO dans les Otudes antOrieures de dOclin ‡ long terme de la taille ‡ maturitO du saumon sockeye (O. nerka) du fleuve Fraser. Nous avons