日本海と周辺における好冷性介形虫類(甲殻亜門介形虫綱)の分布と海洋環境
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This paper overviews water temperature and salinity ranges for living relict species of cryophilic ostracods (Crustacea: Ostracoda) in and around the Japan Sea (=Sea of Japan). Fourteen representatives of cryophilic species belonging to the families Hemicytheridae, Cytheruridae and Eucytheridae are used for geographical analysis. These results provide new information on the ecology (living water temperature and salinity) of the cryophilic ostracod fauna from Japan and their survival through the Pleistocene environmental fluctuations. By the summer temperature and salinity habitat requirements, these species could be divided into three groups: (a) Japan/open sea-inner bay (0-20℃, 30-34‰) species group; (b) Japan-Alaska/open sea (around 5℃, 31-34‰) species group; (c) Japan/open sea (0-20℃, around 34‰) species group. The winter temperature and salinity of areas inhabited by these three species groups falls in a single range of 0-5℃ and 30-34‰. The ability of all these species to tolerate a winter low temperature of less than 5℃ is considered critical for their survival. Based on their geographical distribution of modern and fossil records, these species are interpreted to have survived the cyclic environmental changes between glacial and interglacial periods in the Pleistocene by expansion or contraction of their geographical ranges. Their wide temperature and salinity tolerance is considered to be the most advantageous factor for survival through the Pleistocene environmental fluctuations in the Japan Sea, linked with the glacio-eustatic sea-level changes.
- 日本動物分類学会の論文
- 2006-02-20
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関連論文
- 日本海の好冷性介形虫相の変遷と海洋環境(日本海の生物相の変遷と環境変動-過去,現在そして未来へ向けて)
- 日本海と周辺における好冷性介形虫類(甲殻亜門介形虫綱)の分布と海洋環境
- P-168 大桑-万願寺型介形虫の分布水塊環境 : 現生種および日本海の更新世の絶滅種について(23. 新生代古生物(液晶有),ポスター発表,一般講演)