Sex-biased mortality and adult body size in an anadromous salmon : investigation from the viewpoint of evolutionary ecology

为了更好地了解动物生活史中性别差异的进化原因和过程，我们从进化生态学的角度研究了雌性马苏鲑（Oncorhynchus masou）性别偏倚死亡率与成年体型之间的关系。在两个测试人群中，正如预测的那样，女性偏倚死亡率和性别大小二态性同时发生。在这里发现的这种性别偏见特征的共同出现可能是由于性别特定的喂养策略，这是由于在成年体型的繁殖选择上的性别差异。

Relationships between sex-biased mortality and adult body size were evolutionary-ecologically examined in anadromous masu salmon(Oncorhynchus masou) to better understand evolutionary causes and processes of sex-differences in animal life histories. In two tested populations, as predicted, female-biased mortality and sexual size dimorphism co-occurred. Such a co-occurrence of sex-biased traits found here might result from sex-specific feeding strategy that is due to sex-differences in breeding selection on adult body size.