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Copepod Assemblages of the Northern South China Sea

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[We studied copepod assemblages in the northern South China Sea during October 2004. A total of 78 copepod species was identified from 24 families and 42 genera that include the four orders Calanoida, Cyclopoida, Harpacticoida, and Poecilostomatoida. The high copepod diversity in the study area may mainly be caused by both the year-round Kuroshio Current intrusion and the SW monsoon, prevailing in the South China Sea during summer. Water currents in the region transport marine planktonic fauna, that comprises predominantly Copepoda from subtropical and tropical water masses. Calanus sinicus did not appear, indicating that there was no cold water mass intrusion in that area during October 2004. Clausocalanus furcatus and C. arcuicornis were most dominant, occurring in 27 of a total of 28 samples (occurrence rate (OR): 96.43%). Thirteen copepod species were found once in all samples. The three most dominant copepods considering all samples were Clausocalanus furcatus (RA: 15.32%), C. arcuicornis (RA 13.52%), and Paracalanus nanus (RA: 9.28%). Most species of copepods performed a common diel vertical migration, descending during daytime and ascending at night at different rates to different depth zones. There were smaller numbers of species and lower diversity indices in surface waters (1-2 m depth) as compared to depths below 50 m. Copepoden Gemeinschaften des nördlichen Südchinesischen Meeres waren Gegenstand einer Untersuchung im Oktober 2004. Insgesamt 78 Copepodenarten aus 24 Familien und 42 Gattungen und vier Ordnungen (Calanoida, Cyclopoida, Harpacticoida und Poecilostomatoida) konnten dort bestimmt werden. Die hohe Diversität im Untersuchungsgebiet wird massgeblich auf den ganzjährigen Einfluss eines westlichen Zweiges der Kuroshio Strömung und den im Sommer im Süchinesischen Meer vorherrschenden Südwestmonsoon zurückgeführt. So erzeugte Strömungen bringen marines Plankton in die Region, das von den Copepoda aus subtropischen und tropischen Wassermassen dominiert wird. Calanus sinicus konnte nicht gefunden werden was einen Kaltwasser-masseneinfluss in der Region im Oktober 2004 ausschliesst. Clausocalanus furcatus und C. arcuicornis waren dominant, und in 27 von 28 Proben vertreten (Präsenz (OR): 96,43%). Dreizehn Copepodenarten konnten in allen Proben nachgewiesen werden. Die drei in allen Proben vorherrschenden Copepodenarten waren Clausocalanus furcatus (RA: 15,32%), C. arcuicornis (RA: 13,52%), und Paracalanus nanus (RA: 9,28%). Die meisten Copepodenarten zeigten tägliche Vertikalwanderungen, mit einer Wanderung in die Tiefe tagsüber und einer gegenläufigen Wanderung nachts, aber artspezifischen Trends. Im Oberflächenwasser (1-2 m Tiefe) konnten geringere Diversitäten (Arten-zahlen und Diversitätsindizes), We studied copepod assemblages in the northern South China Sea during October 2004. A total of 78 copepod species was identified from 24 families and 42 genera that include the four orders Calanoida, Cyclopoida, Harpacticoida, and Poecilostomatoida. The high copepod diversity in the study area may mainly be caused by both the year-round Kuroshio Current intrusion and the SW monsoon, prevailing in the South China Sea during summer. Water currents in the region transport marine planktonic fauna, that comprises predominantly Copepoda from subtropical and tropical water masses. Calanus sinicus did not appear, indicating that there was no cold water mass intrusion in that area during October 2004. Clausocalanus furcatus and C. arcuicornis were most dominant, occurring in 27 of a total of 28 samples (occurrence rate (OR): 96.43%). Thirteen copepod species were found once in all samples. The three most dominant copepods considering all samples were Clausocalanus furcatus (RA: 15.32%), C. arcuicornis (RA 13.52%), and Paracalanus nanus (RA: 9.28%). Most species of copepods performed a common diel vertical migration, descending during daytime and ascending at night at different rates to different depth zones. There were smaller numbers of species and lower diversity indices in surface waters (1-2 m depth) as compared to depths below 50 m. Copepoden Gemeinschaften des nördlichen Südchinesischen Meeres waren Gegenstand einer Untersuchung im Oktober 2004. Insgesamt 78 Copepodenarten aus 24 Familien und 42 Gattungen und vier Ordnungen (Calanoida, Cyclopoida, Harpacticoida und Poecilostomatoida) konnten dort bestimmt werden. Die hohe Diversität im Untersuchungsgebiet wird massgeblich auf den ganzjährigen Einfluss eines westlichen Zweiges der Kuroshio Strömung und den im Sommer im Süchinesischen Meer vorherrschenden Südwestmonsoon zurückgeführt. So erzeugte Strömungen bringen marines Plankton in die Region, das von den Copepoda aus subtropischen und tropischen Wassermassen dominiert wird. Calanus sinicus konnte nicht gefunden werden was einen Kaltwasser-masseneinfluss in der Region im Oktober 2004 ausschliesst. Clausocalanus furcatus und C. arcuicornis waren dominant, und in 27 von 28 Proben vertreten (Präsenz (OR): 96,43%). Dreizehn Copepodenarten konnten in allen Proben nachgewiesen werden. Die drei in allen Proben vorherrschenden Copepodenarten waren Clausocalanus furcatus (RA: 15,32%), C. arcuicornis (RA: 13,52%), und Paracalanus nanus (RA: 9,28%). Die meisten Copepodenarten zeigten tägliche Vertikalwanderungen, mit einer Wanderung in die Tiefe tagsüber und einer gegenläufigen Wanderung nachts, aber artspezifischen Trends. Im Oberflächenwasser (1-2 m Tiefe) konnten geringere Diversitäten (Arten-zahlen und Diversitätsindizes)]

Affiliations: 1: Institute of Marine Biology, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan; 2: South China Sea Institute of Oceanography, Chinese Academy of Sciences, Guangzhou, China; 3: Institute of Marine Biology, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan;, Email: jshwang@mail.ntou.edu.tw

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/content/journals/10.1163/156854008783244753
2008-01-01
2016-12-05

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