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Title: Heterotrophic bacterial and Synechococcus spp. Growth and mortality along the inshore-offshore in the East China Sea in summer
Authors: An-Yi Tsai;Gwo-Ching Gong;Robert W. Sanders;Kuo-Ping Chiang;Chien-Fu Chao
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: Dilution experiments;East China Sea;Changjiang River;Heterotrophic bacteria
Date: 2012-02
Issue Date: 2017-02-07T08:29:35Z
Publisher: Journal of Oceanography
Abstract: Abstract:This study used the dilution method to examine growth and grazing rates of heterotrophic bacteria and an autotrophic picoplankton, Synechococcus spp., from 1 to 11 July 2007 in the East China Sea. The main influence of oceanographic conditions in this aquatic system was the introduction of fresh, high-nutrient water from Changjiang River and the extremely nutrient-poor, high-salinity waters of Kuroshio Water. In these experiments, deviation from linearity in the relationship between dilution factor and net growth rate was significant in a large number of cases. Growth rates for heterotrophic bacteria ranged from 0.024 to 0.24, and for Synechococcus spp. from 0.03 to 0.21 h−1. Grazing rates ranged from 0.02 to 0.19 and 0.01 to 0.13 h−1, respectively. The spatial variations of Synechococcus spp. production to the primary production ratio (SP/PP) were low (<5%) in high Chl a environments and increased exponentially in low Chl a environments, indicating that Synechococcus spp. contributes to a large extent to the photosynthetic biomass in the open sea, especially in the more oligotrophic Kuroshio Water. Furthermore, the results of our dilution experiments suggest that nanoflagellates largely depend on heterotrophic bacteria as an important energy source. On average, heterotrophic bacteria contributes to 76 and 59% of carbon consumed by nanoflagellates within the plume (salinity <31) and outside of it (salinity >31).
Relation: 68(1), pp.151–162
Appears in Collections:[Institute of Marine Environment and Ecology] Periodical Articles

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