Reproductive tactics and fertilization success of mature male Miyabe charr, Salvelinus malma miyabei
Reproductive tactics and fertilization success of mature male Miyabe charr, Salvelinus malma miyabei
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成熟雄性 Miyabe charr Salvelinus malma miyabei 的繁殖策略和受精成功率
DOI：
10.1007/bf00005427
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发表时间：
1986
影响因子：
1.4
通讯作者：
H. Onozato
中科院分区：
文献类型：
--
作者：
K. Maekawa;H. Onozato
研究了自然和人工条件下溪流和湖中雄性红点红点鲑 (Salvelinus malma miyabei) 的产卵行为、受精成功率和繁殖生态学。根据堰数据估计，在日本的然别湖，两种雄性的比例约为1：1。大多数溪流中的雄性在 2 岁以上就性成熟，而湖中的雄性则在 4 岁以上开始性成熟。与在湖中与雌性配对的体型较大的雄性相比，较小的溪流雄性试图通过“裸奔”进入巢穴来使卵受精。我们通过电泳技术证明，居住在溪流中的雄性能够通过裸奔使卵子受精。在人工条件下，估计单个溪流雄性受精卵的最大比例约为 16.8 个。夏尔双重交配系统的进化稳定性可以用格罗斯的替代生活史进化理论来解释，尽管还需要进一步的测试。
Spawning behaviour, fertilization success and reproductive ecology of stream-resident and lake-run male Miyabe charr,Salvelinus malma miyabei, were studied under natural and artificial conditions. In Shikaribetsu Lake, Japan, the ratio of the two types of males is approximately 1:1, estimated by weir data. The majority of stream-resident males mature sexually at 2+years of age, while the lake-run males begin to mature at 4+. In contrast to the large-bodied lake-run males, which paired with females, the smaller stream-resident males attempted to fertilize eggs by ‘streaking’ into the nest. We demonstrated through electrophoretic techniques that stream-resident males were able to fertilize eggs by streaking. Under artificial conditions, the estimated maximum proportion of eggs fertilized by a single stream-resident male was about 16.8. The evolutionary stability of the charr's dual mating system may be explained by Gross's theory for alternative life-history evolution, although further testing is necessary.