Effects of timing of nest entry and body size on the fertilization success of alternative male reproductive phenotypes of masu salmon (Oncorhynchus masou)
Effects of timing of nest entry and body size on the fertilization success of alternative male reproductive phenotypes of masu salmon (Oncorhynchus masou)
复制标题
入巢时间和体型对马苏鲑鱼（Oncorhynchus masou）替代雄性生殖表型受精成功率的影响
DOI：
10.1139/z08-093
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发表时间：
2008
影响因子：
1.4
通讯作者：
K. Maekawa
中科院分区：
文献类型：
--
作者：
M. Watanabe;S. Takamura;K. Maekawa
以日本北海道柴里别秀湖自然种群马苏鲑鱼(Oncorhynchus Masou(Brevoort，1856))为研究对象，采用行为观察和亲子关系分析相结合的方法，探讨了不同交配策略(大型迁徙雄鱼与小成年雄鱼偷渡)受精成功率的影响因素。体型较大的雄性优先接近雌性；迁徙雄性通过在筑巢的雌性附近守卫来做到这一点，而成熟的雄性Parr通过采取运动鞋行为和参加产卵小组来做到这一点。成年雄性PARR的状态与入巢成功率有关，而与入巢时机无关，但入巢时机影响运动鞋受精成功率，运动鞋受精需要射精与配对产卵同时进行。每只与雌性成功产卵的雄性个体的相对大小也可能决定其受精卵的比例，因为体型较大的雄性具有更大的受精卵比例。
Using a natural population of masu salmon (Oncorhynchus masou (Brevoort, 1856)) in a stream of Shikaribetsu Lake, Hokkaido, Japan, we combined behavioural observations with genetic parentage analysis to explore the factors affecting fertilization success achieved by alternative mating tactics (fighting by large migratory males and sneaking by small mature male parr). Larger males gained priority access to females; migrant males do this by holding a guarding position near the nesting female and mature male parr do this by adopting sneaker behaviour and attending spawning groups. Status of mature male parr was related to success of nest entry but not to timing of nest entry, although the timing of nest entry influenced fertilization success of sneakers and ejaculation simultaneous with pair spawning was needed for fertilization by sneakers. The relative body size of each male who successfully spawned with a female is also likely to determine the proportion of eggs he fertilized because larger males have lar...