碩士 / 國立臺灣海洋大學 / 海洋環境化學與生態研究所 / 103 / Photosynthetic picoeukaryotes (< 3μm) are the major contributors to primary productivity in various marine systems. The objectives of this study was to investigate the diel variations in abundance of different photosynthetic picoeukaryote taxonomic groups in the coastal water northeast of Taiwan. Size fractionation was applied to measure their growth rate and grazing rate. Our results indicated that photosynthetic picoeukaryotes always follow Synechococcus in fluctuation of abundance. Abundance of Synechococcus is higher in nighttime than in daytime, probably because photosynthetic picoeukaryotes grow in the daytime. After reaching maximum at night, the abundance declined due to the the top-down control by their consumers. For taxonomic composition in photosynthetic picoeukaryotes, abundance of prasinophytes on average is 21% of the total picoeukaryotes which fluctuated synchronously with Synechococcus. Abundance of haptophytes on average is 12% of the total picoeukaryotes, but does not fluctuate synchonously with Synechococcus, probably due to the mixotrohic life history of the haptophytes. Our results of size fractionation experiments show that the growth rate of prasinophytes and haptophytes are often higher than grazing mortality. Furthermore, in picoeukaryotes, the grazing mortality removes about 80% of the growth rate in the total population. But grazing mortality measured in laboratory is seldom identical with that in the field. We should develop more precise and sensitive approaches to measure grazing rate of different kinds of taxonomic among photosynthetic picoeukaryotes.
| Identifer | oai:union.ndltd.org:TW/103NTOU5282008 |
| Date | January 2015 |
| Creators | Lin, Jie-Sian, 林玠賢 |
| Contributors | Chiang, Kuo-Ping, 蔣國平 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 29 |
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