English  |  正體中文  |  简体中文  |  Items with full text/Total items : 27248/39091
Visitors : 2416462      Online Users : 49
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/987654321/25612

Title: Potential Impacts of N2-fixing Trichodesmium on Heterotrophic Bacterioplankton Turnover Rates and Organic Carbon Transfer Efficiency in the Subtropical Oligotrophic Ocean System
Authors: Yu-Fang Tseng;Fei-Jen Lin;Kuo-Ping Chiang;Shuh-Ji Kao;Fuh-Kwo Shiah
Contributors: NTOU:Department of Environmental Biology and Fisheries Science
國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: Ammonium;Bacterial production;Iron;Inorganic nutrient;Kuroshio;Primary production
Date: 2005
Issue Date: 2011-10-20T08:24:43Z
Publisher: TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
Abstract: abstract:Bacterial production (BP), primary production (PP) and N-2-fixing cyanobacteria, Trichodesmium spp. abundance (i.e., [Tricho#]) were measured in the N. Pacific west-boundary Kuroshio Current in summer and autumn, 2001. The warm (28 - 29 degrees C) upper water column (0 - 30 m) in summer was low in nitrate (NO3; 0.08 +/- 0.08 mu M) with Trichodesmium spp. (192 - 2,115 trichomes L-1) observed at all sampling stations. Averaged NO3 in the upper 30 m were higher (0.39 0.27 mu M) in autumn but with no Dichodesmium observed except 1 station with an abundance of 962 trichomes 1:1 in surface waters. PP (21 +/- 7 mu g C L-1 d(-1)) and phytoplankton turnover rate (P mu; 0.48 +/- 0.19 d(-1)) in summer were at least 1.5-fold higher than those recorded in autumn. BP (summer, 2.5 +/- 0.6 mu g C L-1 d(-1); autumn, 2.4 +/- 0.3 mu gC L-1 d(-1)) showed no seasonal difference, but bacterial turnover rate (B mu; 0.11 +/- 0.03 d(-1)) was 57 % higher in summer. The negative trend of [Tricho#] vs. NO3 and higher transmittance in summer indicate that NO3 depletion and better light availability might trigger the development of N2-fixing cyanobacteria. By changed positively with [Tricho#] suggesting that bacterial growth might be enhanced by the supply of "new" inorganic (i.e., NH4) and/or dissolved organic nitrogen from N2-fixing cyanobacterium. From the negative relationship of BP : PP ratio (7 - 21 %) vs. [Tricho#], we deduce that the occurrence of high Trichodesmium abundance might potentially reduce the magnitude of NH4 competition between algae and bacteria. In the open ocean, organic carbon transfer efficiency, either to higher trophic levels or to system exportation, can be greatly enhanced at low BP : PP ratio driven by the proliferation of N-2-fixing cyanobacterium.
Relation: 16(2), pp.361-376
URI: http://ntour.ntou.edu.tw/handle/987654321/25612
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

Files in This Item:

File Description SizeFormat
index.html0KbHTML219View/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