| SHANG Xu,WANG Guizhong,LI Shaojing,GUO Donghui. 2007. Preliminary study of the retention mechanism of planktonic copepods in the Jiulong Estuary in China. Acta Oceanologica Sinica, (4):156－163 |
| Preliminary study of the retention mechanism of planktonic copepods in the Jiulong Estuary in China |
| Preliminary study of the retention mechanism of planktonic copepods in the Jiulong Estuary in China |
| Received:March 01, 2006 Revised:July 26, 2006 |
| DOI： |
| Key words:estuary copepod retention mechanism tidal vertical migration |
| 中文关键词: estuary copepod retention mechanism tidal vertical migration |
| 基金项目: |
| Author Name | Affiliation | E-mail | | SHANG Xu | Department of Oceanography, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China | | | WANG Guizhong | Department of Oceanography, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | gzwang@xmu.edu.cn | | LI Shaojing | Department of Oceanography, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | GUO Donghui | Department of Oceanography, State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | |
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| Abstract: |
| The horizontal and vertical distribution patterns of five planktonic copepods,Calanus sinicus, Acartia pacifica, Tortanus derjugini, Acartiella sinensis and Pseudodiaptomus poplesia, predominant in the Jiulong Estuary, were investigated from May 2003 to April 2004. The results showed that the distribution of these copepods was related to the tidal period but that each species had its own specific pattern. C. sinicus showed no tidal vertical migration behavior and was thought to be a non-resident species in this estuary. Among Acartia pacifica,T. derjugini,Acartiella sinensis, more individuals occurred in the surface than in the bottom waters during flood tide, and the pattern was reversed during ebb tide. The epibenthic copepod P. poplesia usually remained in the bottom waters in the upstream part of the estuary, but it displayed strong tidally-oriented vertical migration in the middle reaches of the estuary.Taking into account the hydrographic characteristics of the Jiulong Estuary,it was hypothesized that the planktonic copepods in this estuary had more or less adopted the mechanism of vertically migrating to the surface waters during flood tide in order to make use of the inflowing tide, and then sinking to the bottom during ebb tide to avoid being carried out of the estuary by net outflow. |
| 中文摘要: |
| The horizontal and vertical distribution patterns of five planktonic copepods,Calanus sinicus, Acartia pacifica, Tortanus derjugini, Acartiella sinensis and Pseudodiaptomus poplesia, predominant in the Jiulong Estuary, were investigated from May 2003 to April 2004. The results showed that the distribution of these copepods was related to the tidal period but that each species had its own specific pattern. C. sinicus showed no tidal vertical migration behavior and was thought to be a non-resident species in this estuary. Among Acartia pacifica,T. derjugini,Acartiella sinensis, more individuals occurred in the surface than in the bottom waters during flood tide, and the pattern was reversed during ebb tide. The epibenthic copepod P. poplesia usually remained in the bottom waters in the upstream part of the estuary, but it displayed strong tidally-oriented vertical migration in the middle reaches of the estuary.Taking into account the hydrographic characteristics of the Jiulong Estuary,it was hypothesized that the planktonic copepods in this estuary had more or less adopted the mechanism of vertically migrating to the surface waters during flood tide in order to make use of the inflowing tide, and then sinking to the bottom during ebb tide to avoid being carried out of the estuary by net outflow. |
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