Upper thermal limits on the oceanic distribution of Pacific salmon (Oncorhynchus spp.) in the spring
Upper thermal limits on the oceanic distribution of Pacific salmon (Oncorhynchus spp.) in the spring
复制标题
春季太平洋鲑鱼（Oncorhynchus spp.）海洋分布的温度上限
DOI：
10.1139/f95-050
复制
发表时间：
1995
影响因子：
2.4
通讯作者：
Y. Ishida
中科院分区：
文献类型：
--
作者：
D. Welch;A. Chigirinsky;Y. Ishida
太平洋鲑鱼通常被认为分布在整个亚北极太平洋，在那里它们形成了占主导地位的鱼类区系。我们使用了一系列的广义加性模型表明，鲑鱼表现出尖锐的阶跃函数响应温度在海洋北太平洋东部在春季。定义南部边界的临界温度因物种而异：粉红鲑鱼和鲑鱼为10.4 °C，银鲑为9.4 °C，红鲑为8.9 °C。这些热极限发生在过渡带南部边界以北，在亚北极域内广泛分离的地理位置，温度远低于每个物种的致死上限。丰度随温度的急剧下降，以及响应发生时的显着低温，表明热屏障在春季形成了对鲑鱼近海分布的有效限制，并可以将太平洋鲑鱼的分布限制在Subarc相对较小的区域。
Pacific salmon are normally thought to be distributed throughout the Subarctic Pacific, an area where they form the dominant fish fauna. We use a series of generalized additive models to show that salmon exhibit a sharp step-function response to temperature in the oceanic eastern north Pacific in spring. The critical temperature defining the southern boundary varied by species: 10.4 °C for pink and chum salmon, 9.4 °C for coho salmon, and 8.9 °C for sockeye salmon. These thermal limits occur well to the north of the southern boundary of the Transition Zone, at widely separated geographic positions within the Subarctic Domain, and at temperatures much lower than the lethal upper limit for each species. The sharp decline in abundance with temperature, and the remarkably low temperatures at which the response occurs, suggests that thermal barriers form an effective limit to the offshore distribution of salmon in spring, and can limit the distribution of Pacific salmon to a relatively small area of the Subarc...