The Effects of Nutrient Composition on the Growth and Relative Dominance of Ultra-Phytoplankton

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Project title

Code/計畫編號

NSC90-2611-M019-002-OP3

Translated Name/計畫中文名

東海長期觀測與研究(I)控制碳通量之環境因子---子計畫II：營養鹽組成、超微浮游植物生長與相對優勢之研究

Project Coordinator/計畫主持人

Jeng Chang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Marine Biology

Website

https://www.grb.gov.tw/search/planDetail?id=641323

Year

2001

Start date/計畫起

01-08-2001

Expected Completion/計畫迄

01-07-2002

Bugetid/研究經費

803千元

ResearchField/研究領域

海洋科學
生物科學

本研究為三年期長期計劃之第二年，長程目標在界定那一種營養鹽會控制超微浮游植物與大型浮游植物間的相對優勢，並進而影響東海海域有機碳的流向及食物鍊的結構。本年中雖曾進行培養實驗，但主要工作為繼續前一年的工作，測試流式細胞儀鑑別超微浮游植物的能力與準確度，以便順利處理培養實驗的樣本。我們以流式細胞儀計數東海及南海的水樣後，發現目前的儀器設定可以清楚的辨識聚球藻、原核綠藻、與微微真核藻等超微浮游生物。另外在2002年5月22日基隆嶼測站的水樣中測得超微浮游植物的垂直分佈，其中聚球藻、原核綠藻、與微微真核藻的最高細胞數分別為 6.5¥104、1.7¥104、與 0.24¥104 cells ml-1。此為國內首次在東海測得原核綠藻的豐富程度。This study is the second phase of a 3-year research project. The long term goal is to identify the critical nutrient species that controls the relative dominance between ultraphytoplankton and phytoplankton of larger sizes, and to examine how this change in dominancy affects the carbon cycling and food chain structure in the East China Sea. Although a number of nutrient enrichment experiments has been performed in this year, previous works on testing a newly purchased flow cytometer to evaluate its performance in identifying ultraphytoplankton and in cell counting precision were continued in this year. When the flow cytometer was used to analyze water samples from the South China Sea and the East China Sea, we found that the improved parameter settings could easily identify Synechococcus, Prochlorococcus, and picoeukaryotes based on cell size and pigment content. In addition, using samples collected at the Keelung Island Station on May 22, 2002, the vertical profiles of these ultraphytoplankton was established. The highest cell concentrations were 6.5¥104 , 1.7¥104 , and 0.24¥104 cells ml-1 for Syn-echococcus, Prochlorococcus, and pico-eukaryotes, respectively. This is the first time that the concentration of Prochlorococcus is measured in Taiwan

Keyword(s)

東海
營養鹽
超微浮游植物
優勢
碳通量
East China Sea
Nutrient
Ultra-phytoplakton
Dominance
Carbon flux

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The Effects of Nutrient Composition on the Growth and Relative Dominance of Ultra-Phytoplankton

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