Radiolarian biogeography in surface sediments of the Northwest Pacific marginal seas
Radiolarian biogeography in surface sediments of the Northwest Pacific marginal seas
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西北太平洋边缘海表层沉积物中的放射虫生物地理学
DOI：
10.1007/s11430-016-5179-4
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发表时间：
2017-03-01
影响因子：
5.7
通讯作者：
Xiang Rong
中科院分区：
文献类型：
--
作者：
Liu Ling;Zhang Qiang;Xiang Rong
通过对南中国海、东中国海、日本海、鄂霍次克海、白令海、菲律宾海和北太平洋西边界流区表层沉积物样品中放射虫的总体丰度和物种组成进行分析，以了解西北太平洋放射虫的生物地理分布及其与主要环境因子和北太平洋环流的关系。结果表明，西北太平洋表层沉积物中的放射虫可分为A类和B类，A类以暖水种为主，主要分布在热带和亚热带海域，放射虫丰度和多样性较高；B类以冷水种为主，主要分布在丰度和多样性较低的北极和亚北极海域。A群进一步分为5个亚群A1至A5，分别对应于东中国海、菲律宾海、南中国海、日本海和黑潮洋流，B群又分为3个亚群B1至B3，分别对应于鄂霍次克海、白令海和亚北极环流区。根据不同生物地理省的放射虫动物群与主要环境参数的关系，我们认为海表面温度(SST)和海面盐度(SSS)是影响西北太平洋地区放射虫动物群的生产力、组成和分布格局的主要因素，而水深可能是各边缘海放射虫动物群的区域差异的原因。此外，根据不同地区常见放射虫种类的分布和丰度格局，我们确定了5种特殊的放射虫组合，可作为指示黑潮主流、黑潮-东中国海支、黑潮-南中国海支、对马流和大西洋流水团的标志。
Overall abundance and species composition of radiolarian faunas were analyzed in surface sediment samples from representative areas of South China Sea, East China Sea, Sea of Japan, Sea of Okhotsk, Bering Sea, Philippine Sea, and the western boundary current regions of the North Pacific, in order to understand the biogeographic distribution of radiolarians in the Northwest Pacific and explore its relationship with the main environmental factors and the North Pacific circulation. The results showed that radiolarians in the Northwest Pacific surface sediments can be divided into two large biogeographic provinces—cluster A and cluster B. Cluster A is characterized by the dominance of warm-water species and distributed primarily in tropical and subtropical seas with high radiolarian abundance and diversity; whereas cluster B is predominated by cold water species and distributed mainly in the Arctic and subarctic seas with comparably low abundance and diversity. Cluster A is further divided into five subclusters, A1 to A5, which correspond to East China Sea, Philippine Sea, South China Sea, Sea of Japan, and Kuroshio Current, respectively; cluster B is divided into three subclusters, B1 to B3, which correspond to Sea of Okhotsk, Bering Sea, and subarctic gyre area, respectively. Based on the relationships between radiolarian faunas and major environment parameters in different biogeographic provinces, we suggest that the sea surface temperature (SST) and sea surface salinity (SSS) are primary factors that influence productivity, composition, and distribution pattern of the radiolarian fauna in the Northwest Pacific regions, while water depth is likely responsible for regional differences in the radiolarian fauna in each marginal sea. In addition, according to the distribution and abundance patterns of common radiolarian species in different areas, we identified five special radiolarian assemblages, which may be used as indicators for main Kuroshio Current, Kuroshio-East China Sea Branch, Kuroshio-South China Sea Branch, Tsushima Current, and Oyashio Current water masses.