碩士 / 國立中興大學 / 植物學系 / 90 / The biomass, production and yield of fish in estuaries are often higher than those in other aquatic ecosystems. In order to understand the food and relative contribution of each primary producer to detritivorous fish, I collected the sources of estuarine organic matter, including vascular plants, periphyton, and seston, from Tapong Bay and Kuandu wetlands, respectively. I used detritivorous fish (Liza macrolepis) as a model fish to examine its stomach contents by evaluating the percentage of weighted point value and to trace its food sources by analyzing stable carbon and nitrogen isotopes ratio. The results from the examination of stomach contents revealed that more than 50% of the contents is detritus, which can not be identified its sources. In addition to the detritus, the stomach contents of L. macrolepis in Kuandu were dominated by vascular plants. In contrast, macroalgae and benthos or microalgae have replaced vascular plants in stomach contents of L. macrolepis in Tapong Bay. The results of stable isotope analysis showed that the contribution of microalgae to the food of the fish is more important than vascular plants in Kuandu. The contribution of microalgae and macroalgae is more important than vascular plants in Tapong Bay. In the size range of L. macrolepis, the organic carbon sources do not shift with size, but the ratio of food changes with environment and season. However, the nitrogen source is different changed in the fish whose size is less than 40mm. As a result, the contribution of periphyton to detritivorous fish is more important than vascular plants. These results were different from the paradigm that mangroves and salt marsh plants are the major food source for estuarine detritivorous fish.
| Identifer | oai:union.ndltd.org:TW/090NCHU0366020 |
| Date | January 2002 |
| Creators | YaTing Wang, 王雃亭 |
| Contributors | Lin Hsing-Juh, 林幸助 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 82 |
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