碩士 / 國立臺灣大學 / 環境工程學研究所 / 105 / Cyanobacterial blooms have been reported in freshwater environments world-wide. Some of these algae lead to serious environmental problems, such as producing toxins and foul odors. Microcystis, one of the most common species occuring during cyanobacterial blooms, is able to form aggregates. Colony formation may be crucial to the dominance of blooms of Microcystis. Forming large colonies are helpful to their vertical migration, nutrient storage, and to defend themselves against grazing pressure. But there is negative relationship between colony size and the specific growth rate. The previous study in this laboratory also found that the particle size of Microcystis in Hsin-Shan Reservoir is not uniform, but in a specific distribution.
In this study we hypothesized that colony growth and disaggregation can lead Microcystis to a specific particle size distribution. Experiments were conducted with Microcystis colonies collected from Hsin-Shan Reservoir. To understand the mechanism of colony disaggregation we need to select colonies in different size ranges and analyze the relationship between colony size and probability of colony disaggregation. The results indicated that particle size distribution of Microcystis extended from original distribution to larger or smaller sizes after incubation. We developed a model considering the specific growth rate and the probability of colony disaggregation relationship with colony size. The results of the simulation indicate that Microcystis can maintain a specific size distribution. That is to say, Microcystis may preserve a dynamic equilibrium of colonial size distribution by following growth and the colony disaggregation pattern we proposed.
| Identifer | oai:union.ndltd.org:TW/105NTU05515035 |
| Date | January 2017 |
| Creators | Pin-Tseng Li, 李品增 |
| Contributors | Shian-Chee Wu, 吳先琪 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 72 |
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