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首页> 外文期刊>Estuarine Coastal and Shelf Science >Assessment of growth patterns of amphidromous fish larvae in alternative estuarine nursery habitats along a developed coast
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Assessment of growth patterns of amphidromous fish larvae in alternative estuarine nursery habitats along a developed coast

机译：沿发达的海岸替代河口苗圃栖息地中Amphidroomous鱼类幼虫生长模式的评估

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摘要

The placement of artificial structures in coastal areas can adversely impact the life histories of larval and juvenile fish by reducing suitable nursery areas. However, little is known about the responses of them to such habitat loss. The ayu Plecoglossus altivelis altivelis is an amphidromous fish that spends its early ontogenetic stages in suitable nurseries, the surf zone, within 2 km from river mouths. To evaluate the possible impact of habitat loss on larval and juvenile ayu, we collected 50 juveniles from the Takahashi River, Okayama, Japan, on 19 April 2018, where more than 95% of the coastal outlet area is covered with artificial structures. Otolith Sr/Ca- and increment analyses were conducted to examine the habitat use and growth rates of each individual. We also collected nine larvae on 27 December 2018 from a semi-natural surf zone, which is located 5 km from the Takahashi River mouth, in order to evaluate their growth rate. The 50 juveniles spent approximately one-third of their marine life stage in estuaries with brackish water, suggesting that the estuaries are the only nursery grounds remaining in this area. Among the 50 juveniles, specimens that experienced lower salinities showed higher growth rates and larger body sizes in the larval stage (1-80 days old). However, a large variation in growth rates was also observed among the specimens that grew in estuaries, probably owing to environmental instability in the area. While the difference was not statistically significant, the nine larvae from the semi-natural surf zone showed higher growth rates than the 50 juveniles from the Takahashi River. Our results indicate that the estuaries can be an alternative habitat, but that they might not be a better habitat than the regular surf zone habitat.
机译：通过减少合适的苗圃区域，在沿海地区的人工结构在沿海地区的安置可能会对幼虫和少年鱼的生活历史产生不利影响。然而，关于他们对这种栖息地损失的反应很少。 Ayu Plecoglossus Altivelis Altivelis是一个AmphidroMous鱼类，将其早期的苗圃，海浪区的育苗阶段花在河口2公里内。为了评估栖息地损失在幼虫和少年艾湖的可能影响，我们从2018年4月19日收集了日本高山河，冈山的50名青少年，其中超过95％的沿海出口区被人工结构覆盖。进行了欧特里斯SR / CA-和增量分析，以检查每个人的栖息地使用和增长率。我们还于2018年12月27日从半自然冲浪区收集了九九八年的幼虫，距离Takahashi河口有5公里，以评估其增长率。 50名青少年在河水中花费了大约三分之一的海洋生命阶段，带有咸淡的水，这表明河口是该领域唯一留下的苗圃场地。在50例幼儿中，经历较低的盐度的标本显示出幼虫阶段的增长率较高，体积较大（1-80天）。然而，在河口增长的标本中也观察到增长率的大变化，这可能是由于该地区的环境不稳定。虽然差异没有统计学意义，但来自半天然冲浪区的九个幼虫表现出比Takahashi河的50岁的少年更高的增长率。我们的结果表明，河口可以是替代栖息地，但它们可能不是常规冲浪区栖息地更好的栖息地。

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