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基于北太平洋海洋科学组织(PICES)近年来年会的发表论文数据,利用TDA软件工具,分析PICES的发展趋向与研究热点。结果表明:尽管成立于1992年的PICES的影响范围与程度不断增加,但作为6个成员国之一的中国,对PICES的参与度还较低,影响程度有限;近年来,PICES组织年会所关注的热点基本聚焦于气候变化、气温、海洋生态系统等北太平洋海洋地区大尺度的重大国际海洋环境问题上。对中国而言,需要通过积极参与PICES组织的各项活动提高参与度。 相似文献
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The diurnal vertical migration of planktonic crustaceans may be divided into two types: Type 1, species with marked diurnal vertical migration; Type 2, species without marked diurnal vertical migration. The former may be further grouped into three patterns: Pattern 1, sinking by day and rising by night; Pattern 2, rising by dawn and evening and sinking by day and midnight; Pattern 3, rising by day and sinking by night. The latter may be further grouped into the following three patterns: Pattern 1, surface layer distribution; Pattern 2, bottom layer distribution; Pattern 3, even distribution between the surface and bottom layers. Among these patterns the two most common ones appear to be the sinking by day and rising by night' and the surface layer distribution. Most of the females are no more marked in the diurnal vertical migration than males in the Xiamen Harbour. The diurnal vertical migration of the animal become more and more conspicuous with the increase of the ages and varies markedly with season 相似文献
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