English  |  正體中文  |  简体中文  |  Items with full text/Total items : 26988/38789
Visitors : 2353440      Online Users : 23
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40995

Title: Diel cycles of heterotrophic bacterioplankton abundance and production in the ocean surface waters
Authors: Fuh-Kwo Shiah
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: Dissolved organic carbon
Bacteria
Oligotrophic
Kuroshio
Growth rate
Inorganic nutrients
Date: 1999-06
Issue Date: 2017-02-08
Publisher: Aquatic Microbial Ecology
Abstract: Abstract: To examine the magnitude of phytoplankton-bacterial coupling in low productivity areas, diel changes of bacterial abundance and production as well as primary production (PP) in the oligotrophic Kuroshio surface waters were investigated by on deck carboy incubation and consecutive hydrocast sampling. Both methods yielded similar results. Cell counts varied <13% in 1 diel cycle, while thymidine (TdR) incorporation rates and TdR incorporation per cell (TdR cell-1) varied 2- to 5-fold with higher values appearing at night. Such opposing trends between the bacterial rate parameters and PP were consistent over different locations and months. When incubated under an artificial light source, the TdR cell-1 in whole water samples were negatively correlated with light intensity and PP. In nutrient enrichment experiments, the addition of labile organic carbon (glucose) had no effect on bacterial growth in noon and midnight samples. Values of the TdR cell-1 in midnight samples increased about 70% when the inorganic nutrient mixture (NH4+ and PO4-3) was added; however, such addition did not enhance the TdR cell-1 in noon samples. This study demonstrates that the diel pattern of bacterial growth in the ocean surface water is opposite to that of phytoplankton. UV radiation is not required in driving such a variation since UV was excluded in the experimental set-up. There seems to be no simple explanation for the phenomenon reported by this study. Other potential factors, such as inorganic nutrient, organic substrate supply rates and bacterivory, all might play roles in affecting the bacterial diel cycle.
Relation: 17(3)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40995
Appears in Collections:[海洋環境與生態研究所] 期刊論文

Files in This Item:

File Description SizeFormat
index.html0KbHTML41View/Open


All items in NTOUR are protected by copyright, with all rights reserved.

 


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback