南海北部和西菲律宾海颗石藻种群特征及差异  

COMMUNITY STRUCTURES OF THE LIVING COCCOLITHOPHORES IN THE NORTHERN SOUTH CHINA SEA AND THE WESTERN PHILIPPINES SEA

作　　者：梁文 Priyadarshani Nilanthi 冉莉华[1,2] 杨志[1] 邹杨浩 陈建芳[1,2] 

机构地区：[1]国家海洋局海洋生态系统与生物地球化学重点实验室,杭州310012 [2]卫星海洋环境动力学国家重点实验室,杭州310012 [3]南京大学地球科学与工程学院表生地球化学教育部重点实验室,南京210046

出　　处：《微体古生物学报》2017年第3期279-290,共12页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(批准号:91128212;41006034;41406091);国家海洋局第二海洋研究所基本科研业务专项资金项目(批准号:JT1401)和国家海洋局"全球变化与海气相互作用"专项(批准号:GASI-03-01-03-03;GASI-03-01-02-02)共同资助~~

摘　　要：本文对南海北部SCS-N站(116°E,18°30′N,2016年5月)和菲律宾海西部PAC-ST02-34站(129°59.7′E,17°29.7′N,2016年1月)真光层中颗石藻种群结构进行了对比。总体而言,南海北部真光层颗石藻丰度高于西菲律宾海,而物种多样性指数低于西菲律宾海,这与南海北部真光层中营养盐浓度高于同纬度西菲律宾海有关;两个海域颗石藻丰度极大值都出现在次表层,但在南海北部出现的深度要浅于西菲律宾海,这是由于南海北部真光层营养盐、温、盐跃层较西菲律宾海更浅。Florosphera profunda是两个海域颗石藻种群的主要优势种,南海北部次级优势种为Emiliania huxleyi和Gephyrocapsa oceanica,而西菲律宾海次级优势种则为Umbellosphaera irregularis。颗石藻属种的垂直分布构成在两个海域具有相似的特征,其中F.profunda主要分布在真光层中深层(>80m);G.oceanica和Gladiolithus flabellatus也主要出现在真光层中深层;Umbellosphaera irregularis,Syracosphaera pulchra,Helicosphaera carteri和Discosphaera tubifera等则主要分布在100m以浅;E.huxleyi和Calcidiscus leptoporus在南海北部主要分布在100m以浅,但在西菲律宾海则出现在深层(150m附近)。Community structures of living coccolithophores （LCs） in the euphotic zone at SCS-N station （116° E, 18°30＇ N, May 2016） in the northern South China Sea （NSCS） and PAC-ST02-34 station （129° 59.7＇ E, 17°29.7＇ N, January 2016） in the western Philippines Sea （WPS） were compared in detail in present work. Overall, the abundance of LCs was shown higher in the NSCS than that in the WPS, due to the higher concentration of nutri- ents in the euphotic zone in the NSCS . LCs abundance maximum appeared in the subsurface layer both in the NSCS and WPS, but it was shallower in the NSCS as a result of shallower nutricline, thermocline and halocline. Floro- sphera profunda was the predominant species in both areas, and Emiliania huxleyi and Gephyrocapsa oceanica were the secondary dominant species in the NSCS, while Umbellosphaera irregularis was the second dominant species in the WPS. Shannon-Wiener index of LCs in the NSCS was lower than that in the WPS, indicating relatively higher di- versity of LCs species in the more oligotrophic WPS. Similarities of vertical distribution of LCs species was shown in the NSCS and WPS= F. profunda, as a typical deep-water species, was mainly distributed at depth of 〉 80 m, and the same as G. oceanica and Gladiolithus flabellatus. Umbellosphaera irregularis, Syracosphaera pulchra, Heli cosphaera carteri and Discosphaera tubifera were mainly found at depth of 〈 100 m. E. huxleyi and Calcidiscus leptoporus were more abundant at depth of 〈100 m in the NSCS, however more common in the deep WPS （-150 m）.

关 键 词：颗石藻 真光层 南海北部 西菲律宾海 

分 类 号：Q914.5[天文地球—古生物学与地层学]