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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/29384

Title: Seasonal variations in trophic dynamics of nanoflagellates and picoplankton in coastal waters of the western subtropical Pacific Ocean
Authors: An-Yi Tsai;Kuo-Ping Chiang;Jeng Chang;Gwo-Ching Gong
Contributors: NTOU:Institute of Marine Biology
Keywords: Synechococcus spp;Picoplankton;Nanoflagellate;Microbial loop
Date: 2008
Issue Date: 2011-10-21T03:05:36Z
Publisher: Aquatic Microbial Ecology
Abstract: Abstract:This investigation was undertaken between August 2002 and July 2003 at a coastal station on the southern edge of the East China Sea. We found a 2-phase (warm season, >25°C [June to October] and cold season, <25°C [November to May]) seasonal cycle with a 10-fold variation in the growth of bacteria (heterotrophic bacteria only) and picophytoplankton, primarily coccoid cyanobacteria (Synechococcus spp.), and nanoflagellate grazing rates upon them. Growth rate in bacteria and Synechococcus spp. appeared to be affected by changes in temperature, and the nanoflagellate grazing rate was controlled by concentrations of bacteria and Synechococcus spp. The seasonal cycles of abundance in bacteria and Synechococcus spp. were a reflection of their changing net growth rates (i.e. picoplankton growth rates – nanoflagellate grazing rates), which were highest at the beginning of the warm season. During the warm season, nanoflagellates consumed an equal amount of bacteria and Synechococcus spp.; therefore, growth in both groups was affected equally by grazing in the warm season. However, during the cold season, bacteria contributed more to nanoflagellate carbon consumed than did Synechococcus spp. because the growth rate of Synechococcus spp. was low. We conclude that during the warm season a significant part of bacteria and Synechococcus spp. carbon is channeled through the microbial loop, possibly making it an important link between primary production and higher trophic levels.
Relation: 51(3), pp.263-274
URI: http://ntour.ntou.edu.tw/handle/987654321/29384
Appears in Collections:[環境生物與漁業科學學系] 期刊論文
[海洋環境與生態研究所] 期刊論文
[海洋生物研究所] 期刊論文

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