碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 103 / This study is aimed to investigate seasonal fluctuations of larval fish assemblages in the Hoping estuary, Hualien. Data were collected within five hundred meters of Hoping estuary from February 2013 to November 2014. Push net of traditional larval fisheries and CTD were used in every season to collect the larval fish and hydrographic data. Cluster analysis and Diversity Index analysis were conducted in this study in order to investigate the species composition of larval fish, temporal and spatial distribution, and its relationship with the marine environmental factors.
Based on the hydrographic data, as the season progressed, the marine environment of the area changed accordingly. The average water temperature in winter was from 21.90℃ to 27.02℃. The salinity was from 33.06 to 34.60 psu. In spring, the water temperature was in the range from 18.97℃ to 25.72℃, and the salinity was in between 33.64 and 34.61 psu. In summer, the water temperature was in the range from 25.60℃ to 30.27℃, and the salinity was in between 28.95 and 34.18 psu. In fall, the water temperature was in between 19.04℃ and 25.42℃, and the salinity was in between 33.11 and 34.62 psu.
There were 60,481 larval fishes been collected in this study, and 200 taxa contributing to 83 families. This indicated this area had very high fish species richness, however, the abundance and distribution of the fish differed from seasons. According to data analysis, Harpadon spp. and Encrasicholina puncture were first two dominant species. The most dominant species in each season were listed as follows: Harpadon spp. took 63.95% in spring, Encrasicholina heteroloba took 54.60% in summer, and in full and winter, Encrasicholina puncture had the largest quantity which took 62.60% and 67.92%.
In aspect of the abundances of larval fish, the average in winter was 0.271 ± 0.185 inds./m3, the average in spring was 1.089 ±0.711 inds./m3, the average in summer was 0.213 ± 0.029 inds./m3, and the average in fall was 0.481 ± 0.264 inds./m3. Spring time had the most abundance versus summer time had the least. In terms of the diversity index, it was 3.22 ± 1.05 in winter, 4.91 ± 0.1 in spring, 4.57 ± 2.89 in summer, and 2.86 ± 0.72 in fall. Spring was the highest and fall was the lowest. As for the evenness index, it showed 0.86 ± 0.65 in winter, 0.84 ± 0.09 in spring, 0.78 ± 0.53 in summer, and 0.49 ± 0.07 in fall. Winter was the highest and fall was the lowest. Regarding to the dominance index, it represented 0.92 ± 0.37 in winter, 0.67 ± 0.03 in spring, 0.82 ± 0.72 in summer, and 1.22 ± 0.21 in fall. According to analysis, the dominance index was opposite to diversity index with the results of the highest in fall and the lowest in spring. The outcome of cluster analysis displayed that for seasonal grouping, spring and summer is one group and fall and winter is another.
| Identifer | oai:union.ndltd.org:TW/103NTOU5451005 |
| Date | January 2015 |
| Creators | Hu, Ching-Jung, 胡景榕 |
| Contributors | Lee, Ming-An, 李明安 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 71 |
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