碩士 / 國立臺灣大學 / 海洋研究所 / 99 / Artificial reefs (ARs) have been deployed in the coastal waters of Taiwan for fisheries enhancement since the 1970s. Information on fish communities around ARs has been available for many AR sites. However, we still don’t have enough knowledge on mechanisms accounting for the resource enhancement and the limitations of the AR application. In a natural environment, fish communities are opted to be affected by both biological and non-biological environmental factors. And the trophic composition of the organisms basically implies the supply of energy and its transfer in an ecosystem. Stemmed from these perceptions, the present study has launched a wide spectrum of analysis on fish communities. Data of fish assemblages collected during 2008-2010 from 135 AR sites by scuba divers in waters around Taiwan, along with data of epibenthic cover and environmental factors, were used for analyses on community characteristics, fish abundance and fish biomass. Dendrograms from cluster analysis showed 4 clear clusters of fish assemblages, which could be attributed to geographical areas. In contrast, the effect of AR types was less evident. BIO-ENV and ordination analysis revealed that the structure of overall fish communities were affected more by latitude, water transparency, substratum type, sedimentation, algal coverage and total live cover. Non-biological factors apparently predominated over biotic factors. Trophic analysis showed that invertebrate feeders were common at most AR sites. Besides, in southwestern waters, with the abundant cardinal fishes and damselfishes, a higher proportion of carnivores and piscivores occurred. At offshore islands, planktivores predominated. In both southeastern waters and offshore islands, higher biomasses of herbivores occurred in parallel to higher algal coverages in these regions. Using biomass as an indicator, Parapristipoma trilineatum, Epinephelus lanceolatus and Oplegnathus fasciatus were regarded as the major fishery resource for the AR sites in northern waters; Lutjanus argentimaculatus, L. monostigma and Plectorhinchus cinctus in southwestern waters; Prionurus scalprum and Pomadasys quadrilineatus in southeastern waters; and Platax teira and Naso hexacanthus at offshore islands. Overall, ARs deployed in northern and southwestern waters were more effective in terms of enhancing the production of economically important fishes when compared with those in other waters, despite that the fish assemblages there were less diverse.
| Identifer | oai:union.ndltd.org:TW/099NTU05279030 |
| Date | January 2011 |
| Creators | Chi-Ying Lin, 林其穎 |
| Contributors | 詹榮桂 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 61 |
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