博士 / 國立中興大學 / 生命科學系所 / 103 / Estuaries are open systems, linking together terrestrial, aquatic, and marine ecosystems. We studied the ichthyofauna between two habitats at the Kaomei wetland, which was a protected estuarine wetland covering the largest bulrush marsh grass bed in central Taiwan. The marsh grass sites are dominated by tuberous bulrush grass Bolboschoenus planiculmis with a significant seasonal change in aboveground biomass and the sandy sites represented the sandy flat without vegetation throughout the year. Fish assemblage structures differed markedly between the marsh grass bed and sand flat, whereas the variations of marsh growing and non-growing seasons were less evident in terms of community structures. Although Fish abundance and biomass on marsh grass sites were usually higher than that on sandy flat sites in the whole year. We suggested that the predator pressure was not always effective to affect the changes of fish assemblage. Because few of predators (piscivores) were found on both season and habitats. Due to this results, the refuge hypothesis was accepted in Kaomei wetland, nevertheless, the numbers of predators were too small to compare the function of structural complexity of the two habitats between growing season and non-growing season. Fish assemblages in Kaomei wetland were dominated by marine-estuarine transient species. Based on the results of stable isotope analysis (δ13C and δ15N), fish species were combined into several trophic groups. Several detritivorous fish (Mugilids) dominated in winter, and high trophic level consumers (carnivores) dominated in summer. C3 plants and inshore POM were the most depleted primary food sources for δ13C, but only little fish species depended only on these sources for carbon. C4 plants and epiphytes had higher δ13C values, while about half of the fish species analyzed had similar δ13C values, indicating they depended at least partly for their food on C4 plants and epiphytes material either directly or indirectly through the food web. This study highlighted the importance of enriched potential food sources for supporting estuarine fish, and the feeding hypothesis was accepted due to C4 plants provided main carbon source for estuarine fish.
| Identifer | oai:union.ndltd.org:TW/103NCHU5105074 |
| Date | January 2015 |
| Creators | Chun-hsin Tsai, 蔡俊興 |
| Contributors | Sheng-Hai Wu, 吳聲海 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 94 |
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