摘要:
根据国家海洋局1977年12月份至1978年11月份在黄海南部和东海(28°~34°N,120°30'~127°00'E)广大海域进行周年逐月份的12航次综合调查资料,对该海域毛颚类数量变动、时空分布及其与环境因子的关系进行了分析.结果表明,本调查区毛颚类的数量以6~9月份较高,7月份为年最高值.1~4月份为年低值期,尤以4月份为最低谷.其中在数量上取主导作用的种类是肥胖箭虫(Sagitta enflata)、强壮箭虫(S.crassa)拿卡箭虫(S.nagae)和百陶箭虫(S.bedoti)等种类.在平面分布上,长江口以北毛颚类数量一般高于长江口以南的海域,在南黄海,除夏季外,其他季节均有出现高值.在东海高密集区一般出现在不同水系交汇区,尤其在长江冲淡水、沿岸水和外海高温高盐水交汇的锋面最为密集.这对于不同水系在研究区内运动和消长有一定的指示意义.
关键词:
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毛颚类 /
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数量分布 /
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南黄海 /
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东海
Abstract:
On the basis of investigation data of 12 cruises from December 1977 to November 1978 in waters of southern Huanghai Sea and East China Sea(28~34°N,120°30'~127°00'E).Dynamics of the temporal and spacious quantitative distribution of Chaetognatha and their relations to the environmental factors were analyzed.As results,higher density of Chaetognatha occurs from June to September and the highest in July,and it was low from January to April,especialy the lowest in April in this region,in which Sagitta enflata,S.crassa,S.nagae and S.bedoti were dominant species.The Chaetognatg a density in the northern Changjiang Riverestuary was higher than in the southern Chang jiang River estuary.High density occurred in all seasons except for summer in southern Huanghai Sea,when it generally occurred in mixing waters from various sources,especially in the front of Chang jiang River brackish water,coastal currents,high temperature and high salinity Kuroshio and Taiwan warm water currents and these species gave a certain indication of the wax and wan movement of different water systems in the study area.
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