碩士 / 長榮大學 / 職業安全與衛生學系碩士班 / 95 / Only few attempts have so far been made at the bioaccumulation of environmental toxicants in water birds. The present study investigated the risk of mercury exposure of black-winged stilt, Himantopus himantopus, in the Sihcao Wildlife Reservation Area and its vicinities during the breeding season of the bird. The past releases of pentachlorophenol, dioxin, and mercury during pesticide manufacturing period from 1964 to 1982 by Taiwan Alkali Corporation An-Shun Plant, which adjacent to the Sihcao Wildlife Reservation Area, might pose an ecological risk to the wildlife. Mercury contents in egg, muscle, liver, and feather of black-winged stilt were estimated to assess the levels of exposure. Biological samples taken from Beimen wetland, a related pristine area without the historical contamination, were served for comparison. Five major preys of black-winged stilt (Hydrophilidae, Thiaridae, Gobiidae, Poeciliidae, and Cichilidae) as well as sediments from Sihcao and Beimen were analyzed for their mercury contents to estimate the influence of trophic transfer and contaminated site to the bioaccumulation of mercury in Himantopus himantopus.
Mercury concentrations in eggs of black-winged stilts from Sihcao and Beimen were 0.227±0.137 ppm and 0.188±0.068 ppm, respectively. Statistical analysis showed an insignificant difference among the two (P＝0.206). There were also insignificant differences in mercury contents of Hydrophilidae, Thiaridae, and Gobiidae among the two locations (P＝0.284, 0.191, and 0.09, respectively). Poeciliidae and Cichilidae caught in Sihaco, however, showed significantly higher in mercury contents than those from Beimen (P<0.05). Mercury concentrations in sediments from Sihcao (1.455±1.668 ppm) were significantly higher than those from Beimen (0.010±0.011 ppm)(P＜0.05). Further analyses of mercury concentrations in muscles, feathers, and livers of black-winged stilts showed a better correlation between muscular mercury and liver mercury (r= 0.95) and a generally age-dependent tendency with higher mercury contents in samples of adult birds than those of juvenile ones.
The possibilities of mercury intakes of black-winged stilts from individual food sources were estimated by Monte Carlo simulations of mercury contents, body weights, and ingested ratio of the five major preys. The result indicated a higher possibility of mercury exposure of the water birds through trophic transfer upon preying at Sihcao Wildlife Reservation Area. However, probably due to the long migratory distances and large predatory territory of the water birds, the eggs from Shicao and Beimen had the same level of mercury content.
| Identifer | oai:union.ndltd.org:TW/093CJU00590003 |
| Date | January 2007 |
| Creators | Ying-Ni Ho, 何英妮 |
| Contributors | Ching-Yi Horng, 洪慶宜 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 55 |
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