Secondary sexual characters and sperm traits in coho salmon Oncorhynchus kisutch.
Secondary sexual characters and sperm traits in coho salmon Oncorhynchus kisutch.
复制标题
银大麻哈鱼 Oncorhynchus kisutch 的第二性征和精子特征。
作者：
T. Pitcher;S. Doucet;Jean;D. Hanley
进行了一项研究，以检查第二性征（产卵的颜色和整体身体大小）在一个替代生殖策略的银鲑Oncorhynchus kisutch精子指标：大鹰钩鼻男性产卵的优势为基础的层次结构。男性不太强烈的红色产卵着色有较高的精子速度比男性较深的红色产卵着色。男性体型和精子指标之间没有关系。这些结果表明，在一个替代的生殖策略，精子竞争强度的变化可能会选择性着色和精子质量的投资之间的权衡。
A study was undertaken to examine secondary sexual characters (spawning colouration and overall body size) in relation to sperm metrics in one alternative reproductive tactic of coho salmon Oncorhynchus kisutch: large hooknose males that spawn in dominance-based hierarchies. Males with less intense red spawning colouration had higher sperm velocities than males with darker red spawning colouration. There was no relationship between male body size and sperm metrics. These results suggest that within an alternative reproductive tactic, variation in sperm competition intensity may select for a trade-off between investment in sexual colouration and sperm quality.