The temporal-spatial variation of bacterioplankton in the upwelling region, East China Sea
Date Issued
2005
Date
2005
Author(s)
Hsu, Ting-Yuan
DOI
zh-TW
Abstract
Primary productivity (97~1614 mg C m-2 d-1), bacterial biomass (2.54~17.5mgC m-3),bacterial productivity (0.34~22.9 mgC m-3 d-1), bacterial turn-over rate (=BP/BB; 0.03~2.66d-1), and physical-chemical hydrography in the upwelling region, southern of East China seawere examined for their temporal-spatial variation based on observations during October,2003~November, 2004. Strengthened upwelling was dominant during the winter and earlyspring (January ~April) with lower temperature value (21~25℃), highnitrogen conc.(maximum:12.8 µM) and phosphate conc. （maximum:1.00 µM） in the euphotic zone. During the Kuroshio intrusion (May and August~ October), the upwelling current was un-dominantwith low nutrient concentration. The NP ration was 5.7 in this studying region. It implied that the upwelling region was an N-limitation environment for phytoplankton. Nitrogen
concentration in the upwelling region was shown associated with bacterial productivity and turn-over rate that implied bacterial activity was controlled by the nitrogen supply. Especially,there was the decoupling appearance between primary productivity and bacterial activity in
the upwelling region. This is, the primary productivity was high during June ~July, but bacterial activity during January ~April. and in Sep. There was a suitable for bacteria with low illumination, high nutrient conc., more optimal temperature (>20℃) in the winter and early spring when bacteria had the advantage over phytoplankton. In the summer and autumn when there was a low nutrient conc. and high illumination, the phytoplankton took more advantage over the bacteria by transferring their community composition to smaller size and better oligotrophic enduring-ability. Further more, this study discussed the relationship between this decoupling appearance and phytoplankton-bacteria paradox from pre-researches.
It is possible that this study is the first reporter about the decoupling appearance between phytoplankton-bacteria in the nutrient-laden upwelling region.
Subjects
初級生產力
細菌生產力
湧升流
primary productivity
bacterial productivity
upwelling
Type
thesis
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