西海岸의 江華島와 永宗島에 渡來하는 涉禽類의 生態 = Ecology of the waders migrating go Kanghwa and Youngjong islands on the west coast of Korea

다국어 초록 (Multilingual Abstract)

Seasonal fluctuations of wader population, biomasses of potential benthic invertebrates, and the roosting and foraging behaviour of waders migrating to Kanghwa island and Yongjong island on the west coast of Korea were studied from April 1991 to September 1992.
1. On Kanghwa island, the maximum fluctuation of the total individuals was 240 to 17,176, and the number of species was 3 to 26. The density and biomass of the potential food organisms of wader, in spring, were 992 nㆍm^(-2) and 79.2g ADW m^(-2). In fall, the density was 2,510nㆍm^(-2) and biomass was 47.5g ADWㆍmm^(-2).
2. On the Unnam-ri mudflat of Yongjong island, the maximum fluctuation of the total individuals was 5,836 to 6,691, and the number of species was 19 to 22. The density and biomass of the potential food organisms of wader, in spring, were 185 nㆍm^(-2) and 168.5g ADWㆍm^(-2): In fall, the density was 95nㆍm^(-2) and the biomass was 12.4g ADWㆍm^(-2).
3. On the Sammok-ri mudflat of Yongjong island, the maximum fluctuation of the total individuals was 4,101 to 23,063 and the number of species was 17 to 24. The density and biomass of the potential food organisms of wader, in spring, were 257 nㆍm^(-2) and 287.5g ADWㆍm^(-2): In fall, the density was 74 nㆍm^(-2) and the biomass was 50g ADWㆍm^(-2).
4. The length of time spent by waders roosting at various high tide heights on the Yeocha-ri mudflat, when height of tide was over 8m, was average 322 minutes(SD=35.3).
5. The average number of steps and peckings(or probing) of some dominant species were as follows: 158 steps(SD=15.0) and 30.4 peckings(SD=4.5) for the Kentish Plover; 122.6steps(SD=12.7) and 20.3 peckings(SD=3.0) for the Mongolian Plover; 96.0 steps(SD=12.7) and 10.2 peckings(SD=3.3) for the Grey Plover; 150.3 steps(SD=9.5) and 31.3 peckings(SD=2.5) for the Dunlin; 76.3 steps(SD=23.5)and 15.8 probings(SD=4.9) for the Eastern Curlew. The main prey items of large waders were crabs Macrophothalmus japonicus and those of small and middle-size waders were polychaeta on the Yeocha-ri mudflat.