Hae-Jin Cho

Movements and Home-range of Mallards by GPS-Mobile based Telementary (WT-200) in Korea 1a

청둥오리는 대표적인 한국내 월동 수조류로 넓은 농경지를 월동지로 이용한다. 한국의 중부지역에 위치한 만경강 하류지역에서 청둥오리 월동 행동권 및 월동지에서 이동거리를 파악하고자 하였다. 2011-2013년 월동기에 Cannon-net 을 이용하여 포획된 청둥오리 7개체에 GPS-이동통신 시스템을 기반으로 하는 야생동물위치추적장치(WT-200)를 부착 하였다. 청둥오리 행동권 분석은 GIS용 SHP 파일과 ArcGIS 9.0 Animal Movement Extension을 이용하였으며, 커널밀 도측정법(Kernel Density Estimation : KDE)과 최소볼록다각형법(Minimum Convex Polygon Method : MCP)을 이용 하여 분석하였다. 청둥오리 행동권은 최소볼록다각형법(MCP)에 의해서 118.8 km2(SD=70.1, n=7) 이었으며, 커널밀도 측정법(KDE)으로는 60.0km2(KDE 90%), 23.0km2(KDE 70%) and 11.6km2(KDE 50%)이었다. 야생동물위치추적장치 (WT-200) 부착지점으로부터 이동거리는 평균 19.4km이었으며, 최대이동거리는 33.2km, 최소이동거리는 9.4km이었다. GPS좌표가 획득된 정점간 거리는 평균 0.8km이었으며, 정점간 이동거리는 최소 6.5km에서 최대 19.7km이었다. 청둥오 리는 월동기 동안 매우 짧은 거리를 이동하였으며, 월동지에서 수계 의존성이 매우 높은 경향을 보였다.

Analysis of the Summer Season Home Range of Domestic Feral Cats (Felis catus) - Focused on the Surroundings of Rural and Suburban Areas -

Abstract In order to analyze the home range of feral cats residing in the surroundings of rural and suburban areas, we collected coordination information data from five feral cats. As a result of such research, 100% MCP was defined as minimum 31,500 and maximum 351,900, and 95% KR was defined as minimum 9,400 and maximum 502,800, 75% KR was defined as minimum 3,600 and maximum 126,900, and 50% MCP was defined as minimum 1,800 and maximum 51,700. The home range of feral cats was also analyzed during daytime and nighttime, and all five individuals showed a wider home range during the nighttime than daytime. The analysis of gender shows that the average home range of female feral cats is larger than the average of males. Meanwhile, the results of information data with wide-open areas such as farm land and terrace land on the river showed that the analyzed value was increased generally, and showed variable values depending on the gender and size of each individual feral cat.

Avifauna at Spring season in Yubudo island, Korea

This study was conducted between March and July of 2010 in the area of Yubudo (Is.) in order to assess its avian fauna. A total of 39,121 counts of 37 species were observed over 5 sessions. Important dominant species included the dunlin (Calidris alpine) (48.0%), followed by the bar-tailed godwit (Limosa lapponica) (26.2%), far eastern curlew (Numenius madagascariensis) (5.2%) and the great knot (Calidris tenuirostris) (5.1%). Among the dominant species, the dunlin and the bar-tailed godwit showed significant increase in count, while the great knot showed a decrease. The far eastern curlew, eastern oystercatcher (Haematopus ostralegus) and the Indian curlew (Numenius arquata) did not show any significant difference when compared to previous studies, in terms of both migratory bird count and migratory pattern. Such migratory pattern of dominant species seems to be the result of large scale environmental changes.