Species composition and distribution of polycystine radiolarians (Protozoa) in the plankton from the northwestern South China Sea

WANG Jin-bao; LI Xin-zheng; TAN Zhi-yuan

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WANG Jin-bao, LI Xin-zheng, TAN Zhi-yuan. Species composition and distribution of polycystine radiolarians (Protozoa) in the plankton from the northwestern South China Sea[J]. Haiyang Xuebao, 2005, 27(6): 100-106.

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Species composition and distribution of polycystine radiolarians (Protozoa) in the plankton from the northwestern South China Sea

Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2004-11-03
Rev Recd Date: 2005-07-05

Abstract

Abstract

The species composition and distribution of polycystine radiolarians in the plankton from the northern South China Sea are analyzed based on the samples collected with Judy net by the natioanl comprehensive oceanographic survey of China in 1959 from 128 stations.Two hundred and twelve species belonging to the orders Spumellaria and Nassellaria are identified,in which,145 species (68%) are members of Spumellaria,and 67 species (32%) belong to Nassellaria,and most of them are warm-water species.The species and individual number of Spum ellaria are much more than those of Nassellaria in the area.Four species,i.e.,Spongosphaera strep tacantha Haeckel,Pterocorys camp anula Haeckel,Ommatartus tetrathalamus tetrathalamus Haeckel,and Triastrum aurivillii Cleve,are considered as dominant species,by their ranges and the individual proportion in the total individual number (more than 3%).The results show the variation of radiolarian distribution pattern seaso nally.The individual density and distribution range of radiolarians are the lowest and the narrowest in January and Febr uary;the abundance increases from March,the density reaches the highest in A pril and remains in May and June,and f orms several high density cent res;the density decreases f rom July and August to December.That is to say,radiolarians breed largely and are abundant in late spring and summer,then the populations of species reduce in autumn and become down to the lowest in winter.The results also imply that the abundance and species diversity of poly cystine radiolarians enhance from coast to open sea gradually.This distribution pattern is affected by the water currents,temperature,salinity,and depth.
- Radiolaria,
- Polycystinea,
- South China Sea,
- distribution

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References(21)

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