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首页> 外文期刊>Marine ecology progress series >Plasticity of European flounder life history patterns discloses alternatives to catadromy
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Plasticity of European flounder life history patterns discloses alternatives to catadromy

机译：欧洲比目鱼生活史模式的可塑性揭示了大灭绝的替代方法

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ABSTRACT: European flounder Platichthys flesus life history patterns were investigated in 3 basins along a latitudinal gradient (Minho, N Portugal; Gironde, SW France; Seine, N France). We used coupled Sr:Ca and Ba:Ca otolith signatures and microstructure to retrospectively determine habitats occupied by flounder during their life, including early larval ontogeny. Flounder exhibited high life history plasticity among and even within basins, apparent by the diversity of habitats used during larval ontogeny and throughout their lives, and by the age at which flounder migrated to freshwater. Egg signatures probably had a strong maternal influence, and our interpretation suggests that flounder spawned and/or hatched predominantly in brackish waters in the Minho, while in the Gironde and Seine, flounder spawned and/or hatched either in coastal, brackish or freshwater environments. The freshwater egg signature was most frequent in the Seine. These interpretations contradict the current general assumption that flounder spawn exclusively in coastal waters. During pre-metamorphosis and metamorphosis, flounder were predominantly in brackish waters in the Minho, while in the Gironde and Seine, they were mainly in coastal and freshwater environments, respectively. The diversity of flounder life histories (LH) (i.e. sequence of habitat residence: freshwater, brackish or coastal) after metamorphosis was similar between the Minho (LH = 13), Gironde (LH = 13) and Seine (LH = 14) basins. The age at which flounder migrated to freshwater also varied among sites, at an earlier age in the Minho and Gironde (0.5 yr old) than in the Seine, where flounder migrating from the coast into freshwater reached maximum frequencies at age 1.3 yr old. Thus, catadromy in European flounder may be facultative, and the factors influencing flounder high LH plasticity deserve thorough research.
机译：摘要：研究了欧洲比目鱼（Platichthys flesus）的生活史模式，该物种在三个盆地上沿纬度梯度（葡萄牙北部的Minho;法国西南部的吉伦特;法国北部的塞纳河）进行了调查。我们使用耦合的Sr：Ca和Ba：Ca耳石特征和微观结构来追溯确定比目鱼一生所占据的栖息地，包括早期的幼虫个体发育。比目鱼表现出较高的生活史可塑性，在流域之间甚至盆地内都表现出明显的可比性，这在幼虫个体发育过程中以及整个生命过程中所使用的栖息地的多样性以及比目鱼迁移到淡水的年龄中就可以看出。卵的特征可能对母体有很强的影响，我们的解释表明，比目鱼主要在Minho的微咸水中产卵和/或孵化，而在吉伦特和塞纳河，比目鱼在沿海，咸淡或淡水环境中产卵和/或孵化。淡水鸡蛋签名在塞纳河最常见。这些解释与当前的一般假设相矛盾，即比目鱼仅在沿海水域产卵。在变质前和变质期间，比目鱼主要发生在米尼奥的咸淡水域中，而吉伦特和塞纳河则分别在沿海和淡水环境中。 Minho（LH = 13），Gironde（LH = 13）和塞纳河（LH = 14）盆地变质后的比目鱼生活史（LH）（即栖息地居住顺序：淡水，微咸或沿海）的多样性相似。比目鱼迁移到淡水的年龄也有所不同，Minho和吉伦特省（<0.5岁）的年龄比塞纳河早，塞纳河的比目鱼从海岸迁移到淡水的年龄达到1.3岁的最大频率。因此，欧洲比目鱼的大灾变可能是兼收并蓄的，影响比目鱼高LH可塑性的因素值得深入研究。

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