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
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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
S. Hinch
中科院分区:
农林科学2区
文献类型:
--
作者:
S. Cox;S. Hinch

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被引文献

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与其他加拿大太平洋鲑鱼(Oncorhynchus spp.)不同,弗雷泽河鲑鱼(O.Nerka)成熟时体型长期下降的情况在过去的研究中没有报道。使用10个弗雷泽河红眼种群的特定数据,我们证明在过去42年中,所有种群中的雌性种群和8个种群中的雄性种群的成熟时体型普遍下降。不考虑这一时间趋势,我们发现,在海洋表面温度相对较高的年份,所有种群中的两性在成熟时的大小都较小。在较温暖的年份,增长放缓可能是由代谢需求增加直接造成的,也可能是由影响食物获取的海洋变化间接造成的。我们推测,如果海洋表面温度上升,鲑鱼丰度保持在目前的水平附近,弗雷泽河红眼鱼的适宜性将在未来降低。简历:‡Diautres saumons du Pacifique(Oncorhynchus spp.)加拿大人,在一种新的交通方式下,他们的生活方式是:Oclin‡Long Terme de la Tail‡Matrurito du saumon Sockeye(O.Nerka)du Fleuve Fraser.诺斯·阿凡斯
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