博士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 103 / ABSTRACT
This study investigated the seasonal dynamics of planktonic ciliates, including their cyst production, in a eutrophic coastal ecosystem in the subtropical western Pacific from March 2008 to July 2009. The abundance of planktonic ciliates ranged from 0.2 to 13 x 102 cells L-1 and cyst production ranged from 0 to 3 x 104 cysts m-2 d-1during the study period. The dominant cyst types in this study were Type I and Type II which are similar to Strombidium conicum and Strombidium capitatum, respectively. Cyst abundance changed with inter-day variations in salinity during the warm season ( > 24℃), leading us to conclude that environmental change in the form of freshwater input contributed greatly to the encystment of ciliate populations and might be the primary factor controlling encystment production.
We designed three culture experiments to observe if ciliate is stimulated to form cyst in low salinity circumstance by added in different volume of distilled water. We observed that a large number of cysts appeared in low salinity. On the other hand, it seems that ciliate adapted the low salinity in the last culture stage and started to grow when salinity decline slowly.
We observed in situ or culture experiments a significantly diel dynamics in ciliate, abundance and growth rate greater at night then daytime. The growth rate negative grow in daytime and reach a high level of 0.25 h-1(6 d-1) at night. The significance diel difference in the growth phase indicates the need to consider the diel dynamics when conducting growth rate measurements in ciliates.
| Identifer | oai:union.ndltd.org:TW/103NTOU5451004 |
| Date | January 2015 |
| Creators | Chao, Chien-Fu, 趙健復 |
| 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 | 58 |
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