Coccolithophore assemblages and morphotypes of Emiliania huxleyi in the boundary zone between the cold Oyashio and warm Kuroshio currents off the coast of Japan
Coccolithophore assemblages and morphotypes of Emiliania huxleyi in the boundary zone between the cold Oyashio and warm Kuroshio currents off the coast of Japan
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DOI：
10.1016/j.marmicro.2005.02.002
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发表时间：
2005-04-01
影响因子：
1.9
通讯作者：
Matsuoka, H
中科院分区：
文献类型：
--
作者：
Hagino, K;Okada, H;Matsuoka, H
生活颗石藻组合进行了研究，在日本海岸之间的边界带冷Oyashio和温暖的黑潮电流以及在邻近的水团。共鉴定出64个颗石藻类群。10个类群，包括超过10%的至少一个样品被指定为主要类群。通过形态观察和形态测量，将该藻划分为A型、B型、B/C型和B/C-2型4个形态型。根据主要类群和形态型的组成，将该藻划分为4个颗石藻组合，分别对应于不同的水团：御潮海流、津轻暖流、黑潮海流和西北太平洋中央水。在Oyashio电流政权，现存量的颗石藻是高的，虽然多样性低。区系组成以E. huxleyi B型，并始终含有海球孢菌亚种（Coccolithus pelagicus ssp.）pelagicus HOL、尾状Calciopappus caudatus和圆形Syracosphaera orbiculus。在津轻暖流区系中，植物群以E. huxleyi B/C-2型和Gephyrocapsa oceanica以及相对常见的毕氏布拉球腔菌（Braarudosphaera bigelowii）。在黑潮区，E. huxleyi Type A、Gephyrocapsa ericsonii或G.海洋生物非常丰富。西北太平洋沿岸颗石植物植物群以丰富的E. huxleyi A型、Discosphaera tubifera和Umbellosphaera tenuis IV型。赫胥黎一直
Living coccolithophore assemblages were studied off the Japanese coast in the boundary zone between the cold Oyashio and the warm Kuroshio Currents as well as in adjacent water masses. A total of 64 coccolithophore taxa were identified. Ten taxa that comprised more than 10% of at least one sample were designated major taxa. Morphological observations and morphometric measurements enabled us to sub-divide the Emiliania huxleyi into four morphotypes: Type A, Type B, Type B/C, and Type B/C-2.Based on the composition of major taxa and morphotypes of Emiliania huxleyi, four coccolithophore assemblages were recognized, corresponding to distinct water masses: Oyashio Current, Tsugaru Warm Current, Kuroshio Current, and Western North Pacific Central Water (WNPCW). In the Oyashio Current regime, the standing crop of coccolithophores was high, although diversity was low. The floral assemblage was dominated by E. huxleyi Type B and consistently contained Coccolithus pelagicus ssp. pelagicus HOL, Calciopappus caudatus, and Syracosphaera orbiculus. In the Tsugaru Warm Current regime, the flora was characterized by abundant E. huxleyi Type B/C-2 and Gephyrocapsa oceanica as well as by relatively common Braarudosphaera bigelowii. In the Kuroshio Current regime, E. huxleyi Type A, Gephyrocapsa ericsonii, or G. oceanica were abundant. The coccolithophore flora in the WNPCW was characterized by abundant E. huxleyi Type A, Discosphaera tubifera, and Umbellosphaera tenuis Type IV.Large Emiliania huxleyi specimens (>= 4.2 mu m in length) only occurred north of the Oyashio Front, while to the south, E. huxleyi were consistently