A Study on the Bird Diversity of Gang-neung Watersheds Region

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Park, Jeong-mi

(2003)

 


 

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ABSTRACT

  Naturally formed lagoons around Gang-neung watersheds region, in the east coast of Korea, provide a characteristic habitats for resident and migratory birds. The bird fauna of this region, however, have not been paid much attention and not regularly studied. This study aimed to evaluate the birds diversity in the Gang-neung vicinity watersheds boundaries and to determine importance of the area as a habitats for birds.
The bird surveys were conducted twice a month, total 24 times from October 2001 to September 2002. Three major study sites: Kyoungpo lake, Yeongok river estuary and Namdae river sites were selected for the line and point census. The birds observed in this area were belonged to 14 order 37 family 127 species. The total number of maximum count was 47,617 individuals during one year length study period. The evaluation result showed that Black-tailed Gull(Larus crassirostris), Mew Gull(Larus canus), Mallard(Anas platyrhynchos) and Spot-billed Duck(Anas poecilorhyn

cha) were dominant species in the areas. For species richness by monthly account, the highest individuals, 8,232, was observed in December, whereas, the lowest, 1,143, in July. For the species diversity  by each month comparison, the most species, 60, were observed in April, and least species, 30, were observed in July. During the birds' spring and autumn migration seasons, the species diversity was higher, especially for  shorebirds, waterfowls and gulls in proportion. Dominance record compared for each study sites showed that gulls were  mostly dominant at Yeongok river estuary than shorebirds and waterfowls, and waterfowls and gulls were dominant at Kyoungpo lake, an exception of the June 2002 when a flock of Far Eastern Curlews(Mumenius madagascariensis) were temporarily staged on the way of migration. Likewise, waterfowls and gulls were dominant group at Namdae estuary site. Of all birds observed in the areas, nine species were legally protected as Natural Monument, four species were

protected as endangered species and 10 species as protection species designated by the Ministry of Environment. Eight species were Red Data species of international importance. As for gulls, a major dominant group, 30,325 individuals of 15 species were observed, marking the highest percentage(63.99%) of all the regional bird community. Another dominant group was waterfowls, 13,446 individuals of 22 species were observed, which is 28.24 percent of all. In comparison to the previous survey data, a higher diversity of birds  are regularly utilizing this region's habitats. A total 127 species, which is a large portion(29%) of Korea's bird diversity, were observed in the study area. Therefore, it suggests that the Gang-neung area's watersheds boundaries are vital habitats for migratory birds as well as resident and wintering bird communities.

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