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首页> 外文期刊>ICES Journal of Marine Science >Ocean thermal conditions in the post-smolt nursery of North American Atlantic salmon
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Ocean thermal conditions in the post-smolt nursery of North American Atlantic salmon

机译：北美大西洋鲑鱼熏制后苗圃的海洋热条件

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The effect of climate on the post-smolt survival of North American Atlantic salmon is obscure owing to the difficulty in interpreting the only relationships thus far observed between the abundance of these stocks and climate, which focuses on winter conditions. Placing significance on winter post-smolt survival is contrary to conventional thinking that the spring period is more important, because that is when the post-smolts migrate to sea and transition to ocean life takes place. The pre-fishery abundance for North American stocks was compared to thermal conditions in potential post-smolt nursery areas during the period 1982-1999. Pre-fishery abundance was modeled as a reconstruction of one-sea-winter (1SW) and two-sea-winter (2SW) age salmon populations. Cohort abundance was compared to mean temperature and thermal habitat (sea surface area within a given temperature range) in five index areas. Stock size was negatively correlated with mean sea surface temperature during June. Correlations were comparatively stronger between stock abundance and thermal habitat, further asserting that June conditions - the first month at sea for most stocks in the region - may be pivotal to survival. These correlations suggest that post-smolt survival is negatively affected by the early arrival of warm ocean conditions in the nursery area. Hypotheses related to post-smolt migration, predation, and the availability of suitable prey are discussed.
机译：由于难以解释迄今观察到的这些种群的丰富度与气候之间的唯一关系，而气候主要集中在冬季条件，因此气候对北美大西洋鲑鱼鲑鱼后生存的影响是模糊的。将重要意义放在冬季后软体动物的生存上与传统的认为春季更重要的想法相反，因为那是在后软体动物向海洋迁移并向海洋生物过渡的时候。在1982-1999年期间，将北美种群的捕捞前丰度与潜在的熏后苗圃地区的热条件进行了比较。捕捞前的丰度被建模为一海冬（1SW）和两海冬（2SW）年龄鲑鱼种群的重建。在五个指标区域中，将同类人群的丰度与平均温度和热栖息地（给定温度范围内的海表面积）进行比较。 6月份的种群数量与平均海面温度呈负相关。种群数量与热栖息地之间的相关性相对较强，进一步断言，6月的条件（该区域大多数种群在海上的第一个月）可能对生存至关重要。这些相关性表明，温暖的海洋条件早日到达苗圃地区，对熏鲑后的生存造成负面影响。讨论了与蜕皮后迁移，捕食和合适猎物的可获得性有关的假设。

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