碩士 / 國立臺灣海洋大學 / 海洋環境與生態研究所 / 106 / Synechococcus spp. may contribute substantially differ to total phytoplankton production in the East China Sea (ECS), especially in oligotrophic waters where they can dominate productivity. So far, there are still only a few data published about the dynamics of Synechococcus spp. growth rates in different water mass in the ECS. For this purpose, we assess the use of the modified dilution approach to estimate the growth of Synechococcus spp. during daytime and research was conducted aboard the R/V Ocean Research I in the ECS in summer, 2017. The variability of temperature and salinity observed in the hydrological conditions reflected distinct water mass within ECS region over the study period. During the study period, the variation of temperature as well as salinity is lower in regions influenced by the Changjiang River, but higher on the offshore regions influenced by the Kuroshio. In this study, a good linearity with negative slope was found in both dilution series at Station 18 and 19A, however, in most of our growth incubation experiments, the positive relationships were observed between dilution factor and net growth rates of Synechococcus spp. when the assumptions of the method are not met. In this situation, Synechococcus spp. growth rates were clearly lower in treatments in which the viral and nanoflagellate abundance was reduced at daytime. Furthermore, the instantaneous growth rate of Synechococcus spp. ranged from 0.01 h-1 to 0.39 h-1 in this study, and the highest value of Synechococcus spp. growth rate and production appeared around environment of 31 psu. In other waters which > 31 psu, its growth rates were decreased with increasing the salinity. Our results also showed that instantaneous growth rates of Synechococcus spp. was related to the value of Index of virus-supported, this implied that significant rates of viral mediated nutrient regeneration in oligotrophic environments and support Synechococcus spp. growth.
| Identifer | oai:union.ndltd.org:TW/106NTOU528A001 |
| Date | January 2018 |
| Creators | Huang, I-Ting, 黃怡婷 |
| Contributors | Tsai, An-Yi, 蔡安益 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 48 |
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