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首页> 外文期刊>Canadian Journal of Zoology >The timing of spawning migration: implications of environmental variation, life history, and sex
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The timing of spawning migration: implications of environmental variation, life history, and sex

机译：产卵移徙的时间：环境变化，生活史和性别的影响

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摘要

During 1960-2002, the arrival times of all spawning male and female Atlantic salmon (Salmo salar L., 1758) and brown trout (Salmo trutta L., 1758) entering Dalalven River were recorded. To study the role of environmental variation in spawning migration timing, we used long-term temperature (river and sea) and river discharge data. For salmon, the spawning migration peak was strongly correlated with mean monthly sea and river temperatures during spring: salmon arrived earlier when temperatures were higher and later when temperatures were lower. River discharge explained little of the variation in migration timing. Female salmon migration showed a stronger correlation with temperature than male salmon migration, and female salmon arrived =18 days earlier than males. Trout showed a larger variation in their spawning migration, but river and sea temperatures and river discharge explained little of the variation. Trout females arrived =7 days earlier than males. The sea and river temperatures were highly correlated during the spawning migration, indicating that large climate processes determine the temperature regimes in the Baltic Sea and its tributaries. Time of arrival at the river was not correlated with ovulation date; a female salmon or brown trout arriving late could ovulate almost immediately, whereas a female arriving early could wait to ovulate.
机译：在1960-2002年期间，记录了所有产卵的雄性和雌性大西洋鲑（Salmo salar L.，1758）和褐鳟（Salmo trutta L.，1758）进入Dalalven河的时间。为了研究环境变化在产卵迁移时间中的作用，我们使用了长期温度（河流和海洋）和河流流量数据。对于鲑鱼，产卵迁移高峰与春季春季平均每月海河温度密切相关：温度较高时鲑鱼到达较早，而温度较低时则到达较晚。河流流量几乎不能解释迁移时间的变化。雌性鲑鱼迁徙与温度的相关性比雄性鲑鱼迁徙更强，雌性鲑鱼的到来比雄性鲑鱼早了18天。鳟鱼的产卵迁移表现出较大的变化，但是河流和海洋温度以及河流流量几乎没有解释这种变化。鳟鱼的雌性比雄性提前了7天到达。在产卵移徙过程中，海洋温度与河流温度高度相关，这表明大型气候过程决定了波罗的海及其支流的温度状况。到达河流的时间与排卵日期无关。到达较晚的雌性鲑鱼或褐鳟几乎可以立即排卵，而较早到达的雌性鲑鱼可以等待排卵。

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