A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation.
A hump-shaped relationship between migration distance and adult pink salmon morphology suggests interactive effects of migration costs and bear predation.
复制标题
迁徙距离和成年粉红鲑鱼形态之间的驼峰关系表明迁徙成本和熊捕食之间存在相互作用。
DOI：
10.1139/cjfas-2015-0176
复制
发表时间：
2016
影响因子：
2.4
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Sahashi;G. & Yoshiyama;T.
我们研究了16个粉红鲑鱼（虹鳟gorbuscha）种群的产卵栖息地和成熟时的体形的环境因素之间的关系。在两种性别的分歧矢量（身体深度和头部大小的发展指标）显着相关，距离大海，并描述了一个驼峰形的关系。夸张的体型在离海的中距离最发达，而在离海的近距离和远距离都不太发达。观察到的熊的频率显着下降，从海上的距离，这意味着熊捕食鲑鱼是最激烈的靠近大海。因此，我们的研究结果意味着熊的形状选择性捕食会影响粉红色鲑鱼的形状在河流中的产卵栖息地是靠近大海和迁移成本抑制开发夸大的身体深度和头部的鲑鱼在河流中的产卵栖息地是远离大海的大小。
We examined the relationship between environmental factors of a spawning habitat and body shape at maturity in 16 pink salmon (Oncorhynchus gorbuscha) populations. The divergence vector (indicator of body depth and head size development) in both sexes was significantly correlated with distance from the sea and was described by a hump-shaped relationship. An exaggerated body shape was most developed at mid-distance from the sea and less developed both near and far from the sea. The observed frequency of bears decreased significantly with distance from the sea, implying that bear predation on salmon is most intense near the sea. Therefore, our results imply that shape-selective predation by bears affects the shape of pink salmon in rivers where the spawning habitat is near the sea and that migration costs inhibit development of an exaggerated body depth and head size in salmon in rivers where the spawning habitat is far from the sea.