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首页> 外文期刊>Transactions of the American Fisheries Society >Temperature during incubation as one factor affecting the distribution of Snake River Fall Chinook salmon spawning areas
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Temperature during incubation as one factor affecting the distribution of Snake River Fall Chinook salmon spawning areas

机译：孵化期间的温度是影响Snake River Fall奇努克鲑鱼产卵区分布的因素之一

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摘要

Spawning areas of ocean-type fall Chinook salmon Oncorhynchus tshawytscha in the Pacific Northwest are largely restricted to relatively warm coastal rivers. Fall Chinook salmon spawners in the Snake River basin clearly favor the main-stem Snake River and the relatively warm lower reaches of its tributaries. In this note, we describe how mean temperature during incubation affects fry emergence date and influences the distribution of fall Chinook salmon spawning areas in the Snake River basin. Using laboratory results and field data, we estimated fry emergence dates for three brood years of fish in seven areas that are consistently used by spawners and in five areas that are rarely used by spawners. Mean incubation temperature was significantly (P < 0.0001) higher in consistently used areas (5.6 +/- 0.1degreesC) than in rarely used areas (4.5 +/- 0.1degreesC). The mean estimated emergence date for the consistently used areas was 12 May (+/- 20 d), compared with 26 June (+/- 20 d) for rarely used areas. A logistic discriminant rule fitted from the mean incubation temperatures of the 12 areas discriminated between consistently and rarely used areas with 97%. accuracy. We conclude that temperature is one factor that influences the distribution of fall Chinook salmon spawning areas in the Snake River basin.
机译：西北太平洋地区的海洋型秋努努克鲑鱼Oncorhynchus tshawytscha的产卵区域主要限于相对温暖的沿海河流。斯内克河流域的秋季奇努克鲑鱼产卵场明显偏爱主干斯内克河及其支流相对温暖的下游。在本文中，我们描述了孵化过程中的平均温度如何影响鱼苗的出苗日期以及如何影响蛇河流域秋季奇努克鲑鱼产卵区的分布。利用实验室结果和现场数据，我们估计了在产卵者一直使用的七个区域和在产卵者很少使用的五个区域中三年育成鱼的鱼苗出苗日期。在持续使用的区域（5.6 +/- 0.1℃）中，平均孵育温度显着（P <0.0001）比在很少使用的区域（4.5 +/- 0.1℃）高。经常使用区域的平均估计出土日期为5月12日（+/- 20 d），而很少使用区域的平均出土日期为6月26日（+/- 20 d）。通过对12个区域的平均孵化温度进行拟合的逻辑判别规则，将持续性和极少使用的区域（97％）区分开。准确性。我们得出结论，温度是影响蛇河流域秋季奇努克鲑鱼产卵区分布的因素之一。

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