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pp.120-126
This study was conducted to survey the habitat selection by the Eastern Bean Goose Anser fabalis in the Upo wetland, Changnyeong gun. South Korea from October 2004 to March 2005. The mean number of Eastern Bean Geese was 2,104 individuals during the study period. The minimum number of about 100 individuals was observed in October 2004, and the maximum number of about 3,000 individuals was observed in November 2004 and January 2005. Fourteen sites were classified with respect to water depth and dominant food plant types, and the number of geese using the 14 sites was recorded every week. The sites that were mainly used were S-2 in Sajipo and Z-1 in Jjokjibeol in October, S-2 and S-4 in November, sites U-2 in Upo and Z-1 in December, sites U-2 and S-4 in January and February, and sites U-2 and Z-1 in March. Three aquatic plants, Scirpus fluviatillis, Trapa japonica, and Zizania latifolia were the main food for geese in the Upo wetland. We determined the monthly habitat selection indexes (Jacob’s index) for the three habitat types, which were classified according to three aquatic plant species. The habitat selection index of the area where Zizania latifolia predominated from October to February had the highest score of 0.40~0.47 among the three habitat types. This indicated that Bean Geese strongly preferred the habitat where Zizania latifolia predominated from October to February. By contrast, the habitat where Scirpus fluviatillis predominated was selected mainly in March. Faecal samples were collected randomly at the six sites mainly used by the geese each month. Zizania latifolia predominated in faeces from October to November, but the proportion of Scirpus fluviatillis and Trapa japonica in faeces increased from December to February.
