| Summary: | 碩士 === 國立臺灣海洋大學 === 海洋生物研究所 === 95 === Abstract
The forth Nuclear Power Plant built at Gungliao,Taipei county. may pose potential environmental threats to the nearby Yenliao Bay coastal ecosystem due to the thermal discharge, impingement and entrainment in the water of outlet and intake areas after the plant starting to operate in the 2009. Therefore, collecting ecological data in Yenliao Bay before the operation of the 4th Nuclear Power Plant and use it as the baseline information is important for the assessment and monitoring programs for the environmental impact of the 4th Nuclear Power Plant.
The purposes of this research are: 1) to demonstrate spatial and a temporal variation of fish community in Yenliao bay; 2) to assemble feeding guilds of dominate fish species using their gut contents; and 3) to construct trophic model of Yenliao bay coastal ecosystem using ECOPATH with ECOSIM.
Results showed that species richness, total biomass, and abundance are all larger in the outlet station than the station near intake area. It may be due to the ecotone effect which resulted from the mixed sand and reef seabed near the outlet area and has an isolated reef located nearby.
According to stomach contents examined, there were five feeding guilds: 1) benthic feeding fish; 2) piscivorous fish; 3) herbivorous fish; 4) zooplanktivorous fish; 5) polyp-feeding fish in the Yenliao Bay. Among them, benthic feeding fish account for the largest proportion (81.3%). The reef dominant species are almost belonging to the zooplanktivores.
The ratio of total primary production to total respiratory is 1.0 which indicates the Yenliao bay was an autotrophic system. It was comprised of 4 trophic levels(4.03). The geometric mean of the trophic transfer efficiencies was 11.1%. The most prominent biological group in terms of biomass and energy flow in the bay was herbivorous zooplankton, its consumption was 983gWW m-2yr-1. Manipulations of the biomass of detritus and benthic feeding fish would have a distinct impact on most compartments. Trophic transfer efficiencies among the 4 trophic levels were 10.7%, 19.3%, and 6.6% respectively. Comparing cycling and ecosystem properties with other coastal ecosystems, it appeared that overall biomass of Yenliao Bay was lower than ones in Chiku and Topony lagoon ecosystems and was equivalent to Kuosheng Bay in the north coast. It is an autotrophic system and has phytoplankton-based food sources, low proportion of the recycled flow, and short food chain. In conclusion, Yenliao Bay is a developing ecosystem which was suffered from disturbances continuously.
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