碩士 / 國立臺灣海洋大學 / 海洋生物研究所 / 107 / Abstract
The purpose of this thesis is to compare the nearshore macrobenthic communities off the first nuclear power plant to the fourth nuclear power plant in Taiwan from 2005 to 2012. It is to determine if the different sedimentary environment of the two plants is due mainly to the operation of the power plants,thus resulted in different microbenthic communities.
The nuclear plant# 1 locates on a relatively open sea. Thus, under the impact of coastal currents, the the sediment environment among inlet,outlet and the background stations were similar and have similar trend of changes. The size of the sediment changes from gravel to fine sand. The distribution of sand particles becomes more uniform, and the organic matter is decreased due to the spreading of organic matter offshore. In terms of biological aspects, due to the significant changes in sediments, the habitat and decrease in organic matter, thespecies richness, density, abundance, and dominance of the three stations were all reduced. The high mobility and environmentally tolerant amphipods and nematodes (Chromadora nudicapitata), Idunella chilkensis, have become the dominant species in this nuclear plant.
The northward flow is around the forth nuclear plant, resulted in the sediment distribution in the outlet and the background station becomes more uniform, and the sediments are mainly composed of coarse sand. Due to the un-operation, the change of the particle type is less than the the first nuclear plant. lt is a more stable sediment environment. Due to the influence of river improvement project in the upper reaches of Shuangxi, the sand carrying downstream was greatly reduced, and resulted in the decrease of sediment near this power plant.The fine mud content in the inlet, outlet and background stations were also significant reduced. The reduction of fine mud can increase the habitat diversity. The stable environment allow inhabited many species with different life characteristics, and the organic matter content in the environment is high, resulted in many benthic animals inhabited here. The dominant species includes high environmental tolerance. nematode (Chromadora nudicapitata), and low-tolerance polychaete splenolae (Syllis sclerolaema) and Syllis ramosa, Aega dofleini, amphipod (Robertgurneya rostrata) and harpacticoida (Pontogeneia rostrata).
The difference in sediment environment between the two power plants showed that the particle distribution of the forth power plant is more uniform than that of the first power plant, and the forth plant has lower fine mud content while more total organic matter,allows the sedimentary environment of the forth plant provide more habitats. This differencee and food sources resulted in the fourth power plant becomes more inhabitable, The change of sediment size is not as large as that of the first nuclear plant. It becomes a stable environment for benthic animals.
The long-term ecological survey,found that， the benthic communities of commercial operating nuclear plant is different from the sealed nuclear storage plant. The different operation modes affect the environmental conditions and stability of the sediments, The adaptive ability of macrobenthic species will also be different. The characteristics and diversity of the macrobenthic communities structure around the two nuclear power plants thus are different.
| Identifer | oai:union.ndltd.org:TW/107NTOU5270006 |
| Date | January 2019 |
| Creators | Chang, Yi-Ling, 張翊玲 |
| Contributors | Cheng, I-Jiunn, 程一駿 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 73 |
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