The importance of sperm competition risk and nest appearance for male behavior and female choice in the sand goby, Pomatoschistus minutus
The importance of sperm competition risk and nest appearance for male behavior and female choice in the sand goby, Pomatoschistus minutus
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精子竞争风险和巢外观对沙虾虎鱼雄性行为和雌性选择的重要性，Pomatoschistus minutus
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
C. Kvarnemo
中科院分区：
文献类型：
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作者：
O. Svensson;C. Kvarnemo
为了测试精子竞争风险的增加是否会影响雄性行为和两性的交配决定，我们使用沙虾虎鱼（Pomatoschistus minutus）进行了两个实验，这是一种具有独家父亲照顾的筑巢鱼。在我们的第一个实验中，一个筑巢的男性，与一个封闭的女性，依次暴露于一个小瓶与运动鞋男性或一个空小瓶。虽然男性求偶，筑巢，位移扇，巢外的时间不受影响，个别男性表现出较高的粘液准备努力巢内的运动鞋男性的存在比单独时。我们发现这种粘液含有精子，因此清楚地表明在精子竞争中的重要性。在我们的第二个实验中，一只雌性可以自由地与两只不同的雄性产卵，其中一只雄性暴露在一只被限制的运动鞋雄性面前。男性交配成功率不受运动鞋男性的存在。然而，砂的体积男性已经把他的巢正相关的女性产卵决策，而巢开口宽度没有。在偏相关的五个特征被认为是吸引女性（巢开口宽度，砂量，男性求偶显示，位移扇，和男性的大小），男性扇好，也建立大巢或显示激烈，但不是两者兼而有之。这表明，男性个体并不是多面手，而是专注于吸引女性的一部分特征。版权所有2005年。
To test if an increased sperm competition risk affects male behavior and mating decisions of both sexes, we performed two experiments using the sand goby, Pomatoschistus minutus, a nest-building fish with exclusive paternal care. In our first experiment, a nest-holding male, with a confined female, was sequentially exposed to a vial with a sneaker male or an empty vial. While male courtship, nest building, displacement fanning, and time outside the nest were unaffected, individual males showed a higher mucus preparation effort inside the nest in the presence of a sneaker male than when alone. We found such mucus to contain sperm, thus clearly suggesting an importance in sperm competition. In our second experiment, a female was free to spawn with two different males, one of which was exposed to a confined sneaker male. Male mating success was not affected by the presence of a sneaker male. However, the volume of sand the male had put on his nest was positively associated with female spawning decision, while nest-opening width was not. In a partial correlation of five traits thought to attract females (nest-opening width, sand volume, male courtship display, displacement fanning, and male size), males that fanned well were found to also build large nests or display intensely, but not both. This indicates that rather than being jacks-of-all-trades, individual males focus on a subset of traits for attracting females. Copyright 2005.