Genetic Differences in Spatially and Temporally Isolated Populations: Winter and Spring Populations of Pelagic Mollusk Clione (Mollusk: Gymnosomata), Southern Okhotsk Sea, Japan
Genetic Differences in Spatially and Temporally Isolated Populations: Winter and Spring Populations of Pelagic Mollusk Clione (Mollusk: Gymnosomata), Southern Okhotsk Sea, Japan
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空间和时间上孤立种群的遗传差异：日本南鄂霍次克海中上层软体动物 Clione（软体动物：Gymnosomata）的冬季和春季种群
DOI：
10.1007/s41208-018-0092-z
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Kunio T. Takahashi
中科院分区：
文献类型：
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作者：
Tomoyasu Yamazaki;Takashi Kuwahara;Kunio T. Takahashi
中上层软体动物脊椎动物是分布在日本鄂霍次克海南部的一种裸露的翼足类动物，由形态和遗传上的差异组成。优雅的组织和C。冬季沿海种群(WCP，1-3月，10-20 mm)和春季近海种群(SOP，4-7月，最大可达30 mm)的体长存在差异。这种个体大小的差异和种群的时空分离表明，SOP要么是一个神秘的物种，要么是ORC。产自亚北冰洋或种间种间的大西洋。由于生殖隔离而产生的优雅组织。我们利用形态和遗传分析研究了这两个种群的分类地位，并鉴定了这两个种群。优雅的动物具有很高的遗传相似性。我们用鄂霍次克海的水团动力学解释了时空孤立种群的发生。通过大豆海峡进入日本鄂霍次克海南部的暖水分为大豆暖水(SWW：6月至11月)和SWW的前驱(FSWW：3月至5月)；进入日本鄂霍次克海的冷水(Sakhalin岛以东)分为东库页岛流水(ESCW：11月至4月)。冷水带(CWB)经常在夏季和秋季在西南偏南海域形成，由来自库页岛附近日本海次表层水或鄂霍次克海底层水的上升冷水组成。我们根据SWW、FSWW、ESCW和CWB动力学给出了WCP和SOP的时空隔离机制。
The pelagic molluskClioneis a naked pteropod with a sympatric two-species distribution in the southern Okhotsk Sea, Japan, consisting of the morphologically and genetically distinctC. elegantissimaandC. okhotensis.Clione elegantissimaappears in both winter and spring, and body length differs between the winter coastal population (WCP, January to March, 10–20 mm) and the spring offshore population (SOP, April to July; up to 30 mm). This body size difference and temporal-spatial separation of the populations suggests that the SOP is either a cryptic species orC. limacinedrifted from the Subarctic Atlantic Ocean or an interspecies ofC. elegantissimaresulting from reproductive isolation. We investigated the taxonomic positions of both populations using morphological and genetic analyses and identified both asC. elegantissimawith very high genetic similarity. We explain the occurrence of spatio-temporal isolated populations using the water mass dynamics in the Okhotsk Sea. Warm water entering the southern Okhotsk Sea around Japan through the Soya Straits is divided into the Soya Warm Water (SWW: June to November) and the Forerunner of the SWW (FSWW: March to May); cold water entering the Okhotsk Sea around Japan, east of Sakhalin Island, is divided into the East Sakhalin Current Water (ESCW: November to April). The Cold Water Belt (CWB) is frequently formed off the SWW during summer and autumn and comprises upwelling cold water originating from either subsurface water of the Japan Sea off Sakhalin or Okhotsk Sea bottom water. We present the temporal-spatial isolation mechanism of WCP and SOP per the SWW, FSWW, ESCW, and CWB dynamics.