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Title: Effects of river inputs on nutrient and organic-carbon conditions and net ecosystem metabolism in the Kaoping (Taiwan) coastal sea
Authors: Hung, J.-J.
Ho, C.-M.
Shiah, F.-K.
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: river discharge
autotrophic condition
community respiration
gross primary production
heterotrophic condition
Date: 2014-01
Issue Date: 2017-02-08T08:51:56Z
Publisher: Marine and Freshwater Research
Abstract: Abstract: This study aims to understand the variability of net ecosystem metabolism in a tropical sea. The contrasting pattern of metabolic state between wet and dry seasons was caused by the pronounced difference of river exports in the Kaoping coastal sea. The depth-integrated gross primary production (IGPP) through the euphotic zone ranged from 2451 to 16230mgCm-2day-1 in summer, and from 844 to 5549mgCm-2day-1 in winter, and was apparently regulated by oceanic temperature, nutrients and organic carbon. The depth-integrated dark community respiration (IDCR), attributed largely to bacterial respiration (BR, ~69%), ranged from 861 to 12418mgCm-2day-1 in summer, and from 997 to 5781mgCm-2day-1 in winter. GPP and DCR correlated inversely with salinity but positively with nutrients, Chlorophyll a, dissolved organic carbon (DOC) and particulate organic carbon (POC). The autotrophic state (IGPP:IDCR>1) prevailed in most stations in summer, whereas the heterotrophic state (IGPP:IDCR<1) occurred in all but Station B1 in winter. Bacterial production (BP) and bacterial respiration (BR) also correlated inversely with salinity but positively with nutrients and DOC. Bacterial carbon demand (BCD) was 0.15 GPP in summer and 0.64 GPP in winter, supporting the autotrophic and heterotrophic conditions in summer and winter, respectively. The metabolic state is apparently determined by seasonal variation of temperature and river exports.
Relation: 65(8)
Appears in Collections:[Institute of Marine Environment and Ecology] Periodical Articles

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