Effects of coastal current and upwelling on the distributions of <em>Calanus sinicus</em> on the northwest continental shelf of the South China Sea

YIN Jianqiang; HUANG Liangmin; LI Kaizhi; LIAN Shumin; LI Chaolun; ZHANG Jianlin

doi:10.3969/j.issn.0253 4193.2013.02.015

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YIN Jianqiang, HUANG Liangmin, LI Kaizhi, LIAN Shumin, LI Chaolun, ZHANG Jianlin. Effects of coastal current and upwelling on the distributions of Calanus sinicus on the northwest continental shelf of the South China Sea[J]. Haiyang Xuebao, 2013, 35(2): 143-153. doi: 10.3969/j.issn.0253 4193.2013.02.015

Citation:

YIN Jianqiang, HUANG Liangmin, LI Kaizhi, LIAN Shumin, LI Chaolun, ZHANG Jianlin. Effects of coastal current and upwelling on the distributions of Calanus sinicus on the northwest continental shelf of the South China Sea[J]. Haiyang Xuebao, 2013, 35(2): 143-153. doi: 10.3969/j.issn.0253 4193.2013.02.015

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Effects of coastal current and upwelling on the distributions of Calanus sinicus on the northwest continental shelf of the South China Sea

doi: 10.3969/j.issn.0253 4193.2013.02.015

1.
Key Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
3.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2012-03-29
Rev Recd Date: 2012-08-13

Abstract

Abstract

Calanus sinicus is a planktonic copepod with wide geographical distribution on the continental shelf of the northwest Pacific.It plays an important role in marine system.Four cruises were conducted from July 2006 to October 2007 in order to understand the seasonal and horizontal variations with the influences of monsoon, ocean current and temperature on its distributions on the northwest continental shelf of the South China Sea.The diel vertical migration (DVM) of C.sinicus was studied at one station located in the southeast of Hainan Island during summer.The results showed that the distribution of C.sinicus abundance varied seasonally and regionally.The mean of C.sinicus abundance was high with 23.30±77.78 ind./m³ in spring, and decreased to 13.74±45.10 ind./m³ in summer.It disappeared in autumn and did not enter into the study area during the investigated period in winter.The surveyed area was divided into three sub-regions in order to further analyze the regional difference, including the east inshore waters of Leizhou Peninsula, the east inshore waters of Hainan Island and and the offshore waters from Leizhou Peninsula to Hainan Island.The average abundance of C.sinicus within the inshore waters of Leizhou Peninsula was reached to be 115.63 (±145.93) and 68.12 (±84.00) ind/m³ in spring and summer, respectively, which was higher than those of the inshore Hainan Island and the offshore from Leizhou Peninsula to Hainan Island.The behavior of C.sinicus DVM was not found in the upwelling area in summer. C.sinicus seemed to be mostly habited in the bottom layer in order to avoid the damage of high temperature in the surface layer.The study area is the seasonal distribution zone of C.sinicus.Our findings suggested that C.sinicus was transported from the East China Sea to the northwest continental shelf of South China Sea by the Guangdong Coastal Current, which was driven by the northeast monsoon in winter and spring.The presence of a cold eddy, in addition to coastal upwelling driven by the southwest monsoon, provided suitable survival conditions for C.sinicus in summer.This species disappeared in autumn due to high temperatures (>27℃) and did not begin to enter into the northwest continental shelf of South China Sea from the East China Sea during the period of investigation in winter.C.sinicus could be considered as an indicator species for China Coastal Current driven by the northeasterly monsoon, and coastal upwelling by the southwesterly monsoon in the northern South China Sea.
- Calanus sinicus,
- northern South China Sea,
- distribution,
- monsoon,
- ocean current,
- indicator species

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