Vertical distribution of zooplankton in the continental slope southwest of Nansha Islands, South China Sea

Du Feiyan; Wang Xuehui; Gu Yangguang; Yu Jie; Wang Lianggen; Ning Jiajia; Lin Qin; Jia Xiaoping; Yang Shengyun

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Article Navigation > Haiyang Xuebao > 2014 > 36(6): 94-103

Du Feiyan, Wang Xuehui, Gu Yangguang, Yu Jie, Wang Lianggen, Ning Jiajia, Lin Qin, Jia Xiaoping, Yang Shengyun. Vertical distribution of zooplankton in the continental slope southwest of Nansha Islands, South China Sea[J]. Haiyang Xuebao, 2014, 36(6): 94-103.

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Vertical distribution of zooplankton in the continental slope southwest of Nansha Islands, South China Sea

1.
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510300, China;Key Laboratory of Fishery Ecology and Environment, Guangdong Province, Scientific Observing and Experimental Station of South China Sea Fishery Resources & Environments, Ministry of Agriculture, Guangzhou 510300, China;Post-doctor Research Station, Ocean College, Xiamen University, Xiamen 361005, China
2.
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510300, China;Key Laboratory of Fishery Ecology and Environment, Guangdong Province, Scientific Observing and Experimental Station of South China Sea Fishery Resources & Environments, Ministry of Agriculture, Guangzhou 510300, China
3.
Post-doctor Research Station, Ocean College, Xiamen University, Xiamen 361005, China

Received Date: 2013-07-11

Abstract

Abstract

As dietary organisms of fish stocks, zooplankton is a key link of mass and energy transformation in the marine ecosystem. There are vertical changes in the species compositions and abundances of zooplankton in the water column. Based on 90 samples from 18 stations collected in April 2011, the vertical distribution of zooplankton in the continental slope to the southwest of Nansha Islands, South China Sea was studied. It was found that the continental slope waters are rich in zooplankton species, with a total number of 580 species belonging to 18 taxa being recorded. There are obvious vertical variations in the zooplankton species compositions. The numbers of zooplankton species occurring in a specific deep group could take up 43.6% of the total number of species, while the number of species occurring in all deep groups made up only 15.8% of the total number of species. There was no obvious dominant species and the dominancy of any single species was low. The overall mean density and wet biomass of zooplankton were 206.27 ind/m³ and 94.03 mg/m³ respectively. The higher density and biomass were found in the deep groups of 0-2 m and 30-75 m and the vertical distribution showed a pattern of double-humped curve. Thermocline was an important factor in the vertical distribution of zooplankton. The abundances of zooplankton in the thermocline layer were higher than those in the upper mixed layer and the water layers bellow the thermocline. Compared to the other regions in the South China Sea, zooplankton abundances were the highest in the continental slope southwest off Nansha Islands, suggesting potentials for fishery development in the region.
- Nansha Islands,
- southwestern continental slope,
- zooplankton,
- vertical distribution

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References(27)

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