碩士 / 國立中興大學 / 生命科學系所 / 97 / To understand the fish communities and their niches of tropical seagrass beds in Taiwan, we surveyed transects through two species of seagrass beds (Thalassia hemprichii and Halodule uninervis) of Dakwan bay, southern Taiwan. From January to December, 2008, we recorded species, number and size of fish and the microhabitat for each individual. We also recorded stomach content of some dominant species in seagrass bed. Our results showed that most fish living in seagrass beds were juvenile coral reef fish. Both fish species and individual numbers were significantly more than sandy area. We found that shallow depth and reef substrate causing more small-size species and reef associated species like Labridae and Pomacentridae in Thalassia area. On the other hand, more bigger-size species like Lethrinidae and Mullidae were found in Halodule area and had more species and individual numbers than Thalassia area. Fish communities were changed significantly by season. School of juvenile coral reef fish appeared in seagrass bed between June and August causing greatest number of species and individual numbers in a year, especially Halodule area. Those numbers then declined by the temperature change in fall. Stomach content analyses show that most juvenile fish in seageass beds were small-crustacean feeders. Only three herbivorous fish were recorded and fed mostly on epiphytic algae or filamentous macroalgae. Leptoscarus vaigiensis was the only species that fed seagrass leaves. Finally, only two piscivorous fish were found in this seagrass beds. Our results demonstrate the functioning of small area seagrass beds still as shelters for settling areas and feeding grounds for some juvenile fish.
| Identifer | oai:union.ndltd.org:TW/097NCHU5105032 |
| Creators | Chen-Lu Lee, 李承錄 |
| Contributors | 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 | 93 |
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