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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41019

Title: A Case Study of System and Planktonic Responses in a Subtropical Warm Plume Receiving Thermal Effluents from a Power Plant
Authors: Fuh-Kwo Shiah
Yueh-Yuan Tu
Hsien-Shiow Tsai
Shuh-Ji Kao
Sen Jan
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: Q10
Primary production
Community respiration
Date: 2005-06
Issue Date: 2017-02-08T02:10:47Z
Publisher: Terrestrial, Atmospheric and Oceanic Sciences
Abstract: Abstract: To explore planktonic and ecosystem responses to thermal effluents of a power plant, three transect surveys were conducted in Nov-01¡¦, May-02¡¦ and Jun-02¡¦ at the bay adjacent to the outlet of Taiwan Nuclear Power Plant II. At the given station, seasonal trends were evident with most maximal measurements observed in Jun-02¡¦. Physical mixing between background seawater and thermal effluents played an important role in determining planktonic biomass since chlorophyll (Chl, < 0.15 - 1.27 mgChl m−3 ) and bacterial biomass (BB, 11 - 48 mgC m −3 ) increased almost linearly seaward. Temperature (20 - 45¢XC) manipulation experiments suggested that phytoplankton were more vulnerable than heterotrophs to thermal stress. Differential temperature responses of auto- and heterotrophs result in primary production (PP, < 1 - 100 mgC m d −3 −1 ) increasing seaward, while community respiration (CR, 15 - 68 mgC m d −3 −1 ) and bacterial growth rate (BGR, 0.03 - 0.9 d −1 ) showed opposite trends. The plume system was heterotrophic (PP/CR ratio < 1) in areas with bottom depths ca. < 10 m, and then switched to autotrophic status (PP/CR ratio > 1 - 3.7) in deeper regions. High observed dissolved organic carbon (DOC) anomaly (23 ¡V 34 gC m −3 ) implied that heterotrophic metabolism was seldom limited by bottom- up control processes. Short-term manipulation experiments showing that BGR and CR increased with rising temperature up to ca. 37¢XC, which was ~12¢XC higher than frequently reported values from most coastal and estuarine ecosystems. We ascribed this to the effects of temperature-substrate interaction. The results of organic carbon (zooplankton extract) ad dition experiments suggested a certain fraction of the in situ DOC was as labile as animal tissue since the increasing trends of BGR in the enriched and control treatments behaved similarly. From a carbon cycling perspective, the positive temperature responses of heterotrophic activities imply that in coastal systems with a high loading of anthropogenic DOC, the biogenic emission rate of CO2 might increase exponentially as global temperatures rise.
Relation: 16(2)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41019
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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