碩士 / 國立臺灣師範大學 / 生命科學研究所 / 97 / The purpose of this study is to understand (a) the spatial (i.e., vertically) and temporal variations and (b) the potential regulatory factors that effected on species composition of bacterioplankton in the oligotrophic Kuroshio Water. Samples were collected on board R/V Ocean Research I and II at station (123°10’ °E；25° 5’ °N) in the Kuroshio Water in March, April and July, 2008. Results showed that the N:P molar ratio ranged within 3.52~6.02, and it suggested that growth of bacterioplankton was N-limited during study period. As for bacterioplankton composition, it was dominated by Pantoea and following by Pelagibacter, either in temporal (spring vs. summer) and spatial (surface vs. 50 m) scales. Seasonally, the indexes of Shannon (H' : 1.87~3.11), Evenness (E : 0.32~0.72), haplotype diversity (Hd : 0.67~0.95), and nucleotide diversity (π：0.20~0.70) were however higher in spring than that in summer with exception of Simpson (D : 0.14~0.34). The results indicated that both species abundance and genetic diversity of bacterioplankton were higher in spring, but it was mostly dominated by Pantoea in summer. Further analyses suggested that higher species abundance of bacterioplankton in spring might be due to relaxation of growth competition in water column with higher nutrient concentration, e.g., DIN, caused by physical disturbance. In opposite, the species abundance of bacterioplankton was low when inorganic nutrient was depleted in summer. It, however, may favor the growth of Pantoea, the dominant species, with the ability of nitrogen-fixation and higher optimum growth temperature in warm summer.
| Identifer | oai:union.ndltd.org:TW/097NTNU5105028 |
| Date | January 2009 |
| Creators | Huai-Zhen Xie, 謝懷貞 |
| Contributors | Chung-Chi Chen, 陳仲吉 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
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