National Taiwan Ocean University Institutional Repository:Item 987654321/40995
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题名: Diel cycles of heterotrophic bacterioplankton abundance and production in the ocean surface waters
作者: Fuh-Kwo Shiah
贡献者: 國立臺灣海洋大學:海洋環境化學與生態研究所
关键词: Dissolved organic carbon
Bacteria
Oligotrophic
Kuroshio
Growth rate
Inorganic nutrients
日期: 1999-06
上传时间: 2017-02-08
出版者: Aquatic Microbial Ecology
摘要: 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.
關聯: 17(3)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40995
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