Life‐history variation in relation to nest site abundance in males of the freshwater goby Tridentiger brevispinis
Life‐history variation in relation to nest site abundance in males of the freshwater goby Tridentiger brevispinis
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淡水虾虎鱼 Tridentiger brevispinis 雄性生活史变异与巢穴丰度的关系
DOI：
10.1111/j.1600-0633.2007.00260.x
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发表时间：
2008
影响因子：
1.8
通讯作者：
D. Takahashi
中科院分区：
文献类型：
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作者：
D. Takahashi
– 在日本琵琶湖的两个种群中对淡水虾虎鱼 Tridentiger brevispinis 的雄性成熟年龄进行了调查，这两个种群的巢穴丰度存在显着差异。在筑巢地点稀缺的近江舞妓，大多数雄性在 3 岁时成熟，在巢中守卫卵的雄性的平均体型大于种群中随机抽样的雄性（包括守卫和非守卫的雄性）。相反，在筑巢地点丰富的南滨，许多雄性在一岁时就成熟了，而且守卫雄性和随机收集的雄性之间的体型大小没有差异。近江舞妓的守卫雄性体型与其巢中卵数量之间的回归线斜率大于南滨。这些结果表明，巢穴的短缺提高了体型较大的雄性的繁殖成功率，这可能是通过雄性之间对巢穴的竞争以及雌性对体型较大的雄性的择偶选择来实现的。我的结论是，在巢产卵者中，巢穴地点的可用性应该通过性选择强烈影响雄性的生活史特征。
– Age at maturity in males of the freshwater goby Tridentiger brevispinis, a species with exclusive paternal care, was investigated in two populations in Lake Biwa, Japan, that differed markedly in nest site abundance. At Ohmi-maiko, where nest sites were scarce, most males matured at age 3, and mean body size of males guarding eggs in nests was larger than that of males sampled randomly (including both guarding and nonguarding males) in the population. Conversely, at Minamihama, where nest sites were abundant, many males matured at age 1, and there was no difference in body size between guarding males and males collected randomly. The slope of regression lines between body size of the guarding male and the number of eggs in his nest was greater in Ohmi-maiko than in Minamihama. These results suggest that the shortage of nest sites enhances reproductive success in larger males, probably through male–male competition for nest sites and female mate choice for larger males. I conclude that in nest spawners, the availability of nest sites should strongly affect life-history traits of males through sexual selection.
通过 PCR-RFLP 分析琵琶湖水系中两种淡水虾虎鱼 Rhinogobius 的遗传变异估计
DOI：
--
发表时间：
2004
期刊：
Ichthyological Research 51
影响因子：
--
作者：
Takahashi D;Ohara K
通讯作者：
Ohara K