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Anadoromous migration of ayu, Plecoglossus altivelis, in the Sagami River

机译：Ayu，Pleecoglossus Altivelis的无婚姻迁移，在Sagami河

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摘要

From 1993 to 1996, we investigated the population ecology of ayu, Plecoglossus altivelis, in the Sagami River running through the central Kanagawa Prefecture, laying emphasis on thier anadoromous migration. Generally, peak migration occurred in April, and the movement of anadromous population during the season seemed to be related to the phases of the moon. Nearly every year, the dominant migratory activity was observed corresponding to the half moon i.e the first or the last quarter of the moon. Another interesting result was an apparent correlation (r- 0.824) between catches of marine-life juveniles and anadromous population size in the same year. A higher correlation (r = 0.971) was obtained except the years with poor water inflow (less than 10 t/s in average) during the months from February to April. It also suggests a strong relationship between anadromous activity and water inflow of the Sagami River. Regarding catadromous population, the size of this larval population during a given year could be correlative to both the catches of marine-life juveniles (r >0.651) and anadromous population size r = 0.668) in the next year, even if no high correlation was indicated (p <0.1).
机译：从1993年到1996年，我们调查了通过卡上川中心县的Sagami河流河畔河口河畔河口河畔河口的人口生态学，并强调了围体迁移。一般来说，峰值迁移发生在4月份，并且在本赛季中的芳族群体的运动似乎与月亮的阶段有关。几乎每年都有占主导地位的迁移活动，对应于半月，即月亮的第一个或最后一季度。另一个有趣的结果是同年海洋生命少年和阿腹种群大小之间的表观相关性（R- 0.824）。在2月至4月的几个月内，除了水流入不良（平均不到10吨/秒）之外，将获得更高的相关性（R = 0.971）。它还表明了Sagami河的阿基罗对活动与水流量之间的良好关系。关于多发性人群，在明年的给定年份的这种幼虫人群的规模可能是在明年内与海洋生命青少年（R> 0.651）和阿腹群体大小r = 0.668的r = 0.668的相关性。即使没有高相关是表示（P <0.1）。

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