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首页> 外文期刊>Journal of oceanography >Vertical Distributions of Larvae of the Clam Ruditapes philippinarum and the Striped Horse Mussel Musculista senhousia in Eastern Ariake Bay, Southern Japan
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Vertical Distributions of Larvae of the Clam Ruditapes philippinarum and the Striped Horse Mussel Musculista senhousia in Eastern Ariake Bay, Southern Japan

机译：日本南部有明湾东部的菲律宾蛤仔幼虫和条纹贻贝Musculista senhousia幼虫的垂直分布

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摘要

We have examined the vertical distributions of planktonic bivalve larvae, particularly the clam Ruditapes philippinarum and the mussel Musculista senhousia which are common and abundant on tidal flats of eastern Ariake Bay, southern Japan. Submersible pumping gear was used to take samples at 2 stations every 2 hours during the spring tide over a whole tidal cycle and/or through daytime and nighttime. Water samples were pumped up from 3 to 5 depths from the surface to sea bottom. Regardless of tidal cycles, D-shaped larvae were concentrated near the surface, while umbo larvae were found at the surface to intermediate depths. On average, these larval densities were significantly higher at the station close to the shore than the offshore station, with no significant difference between daytime and nighttime and between flood and ebb tides at each station. The velocity and direction of water movement at both stations revealed remarkable difference between the surface and bottom waters. The larvae at the surface may quickly disperse and be transported elsewhere, while those in water close to the sea bottom may tend to be retained.
机译：我们研究了浮游性双壳类幼虫的垂直分布，特别是蛤仔菲律宾蛤仔和贻贝Musculista senhousia，它们在日本南部有明湾东部的潮滩上很常见。在整个潮汐周期和/或白天和黑夜期间，在春季潮汐期间，每2小时使用潜水泵装置在2个站点进行采样。从地表到海底，从3到5个深度抽水样。不论潮汐周期如何，D形幼虫都集中在地表附近，而在表面至中间深度发现了小飞虫。平均而言，这些近岸站的幼虫密度显着高于近海站，白天和夜晚之间以及每个站的潮汐和潮汐之间没有显着差异。两个站的水运动速度和方向揭示了地表水和底部水之间的显着差异。在表面的幼虫可能会迅速扩散并转移到其他地方，而靠近海底的水中的幼虫可能会被保留。

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