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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41253

Title: Seasonal variation and cross-shelf distribution of the nitrogen-fixing cyanobacterium, Trichodesium, in southern East China Sea
Authors: Jeng Chang
Kuo-Ping Chiang
Gwo-Ching Gong
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: Trichodesmium abundance
Cyanobacterium
East China Sea
Nitrogen fixation
Date: 2000-03
Issue Date: 2017-02-10T08:40:04Z
Publisher: Continental Shelf Research
Abstract: Abstract: The abundance of a nitrogen-fixing cyanobacterium, Trichodesmium, in the southern East China Sea was surveyed along a cross-shelf transect from 1993 to 1996. Trichodesmium existed mostly in surface water between 0 and 50 m depth, with population densities ranging from 0 to 600 trichomes l−1. A clear seasonal cycle was observed in Trichodesmium standing crop which reached more than 107 trichomes m−2 in summer and became undetectable in winter. The cross-shelf distribution showed a spring-type pattern with higher abundance in the Kuroshio current and low abundance in the coastal zone. In fall months, a reversed distribution pattern appeared with high abundance in the coastal zone and decreasing concentrations toward the shelf break. These distribution patterns were difficult to be explained by temperature alone, and a coastal substance may be important in determining Trichodesmium distribution in shelf seas. The calculated nitrogen fixation rate of Trichodesmium ranged from 0.1 to 59 μmol N m−2 d−1 in the upwelling zone and Kuroshio under non-bloom conditions. This result suggested that Trichodesmium is one of the major contributors to new production in Kuroshio waters.
Relation: 20(4)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41253
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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