碩士 / 國立臺灣大學 / 農藝學研究所 / 99 / This study was using three cluster analyses, Hierarchical Clustering, Partitioning Around Medoids, Self-Organizing Maps and Temporal Maps to find out the temporal changes of marine fish community based on the impingement data collected at the first and the Second Nuclear Power Plant in Taiwan from September 2000 to August 2010. The species Alectis ciliaris, Lobotes surinamensis, Sardinella gibbosa, Sardinella hualiensis, Trachurus japonicus, and Tylosurus acus melanotus, etc. have been decreasing in individual number in recent years from the results of cluster analysis. Those decreasing species were mainly with higher economic values, so the result might reflect the declination in our fishery resources due to overfishing.
Most of the decreasing species belonged to the group of species that mostly appeared in warm months from the results of cluster analysis. Also, from the results of temporal maps, there were groups disappeared in recent years. Those disappeared groups contained mainly the species that mostly appeared in warm months. The reasons why the species that mostly appeared in warm months have been decreasing in recent years need to be found out.
| Identifer | oai:union.ndltd.org:TW/099NTU05417025 |
| Date | January 2011 |
| Creators | Hung-Yen Chen, 陳虹諺 |
| Contributors | , 劉力瑜, 彭雲明 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 51 |
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