천연기념물 난도에서 번식하는 괭이갈매기 개체군 및 서식 환경
Breeding Population and Habitat of Black-tailed Gulls (Larus crassirostris) on Nando Island, Natural Monument
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초록
난도는 괭이갈매기 번식지 중 하나로 천연기념물로서 보호되고 있다. 본 연구에서는 난도에서 번식하는 괭이갈매기 개체군과 서식지 현황을 파악하기 위해서 2015년 7월부터 11월까지 조사하였다. 둥지 밀도를 이용하여 번식 개체군을 산정하였다. 괭이갈매기는 1 m2 당 평균 0.51쌍이 번식하고 있었으며 약 26,760 개체가 난도에 번식하고 있는 것으로 추정된다. 난도의 우점식생은 돌피와 개밀이었으며 괭이갈매기가 은신처나 둥지장소로 이용하고 있었다. 번식기간 중 괭이갈매기의 주된 먹이는 멸치 (48%)로 보인다. 그밖에 난도에서 번식하는 바닷새로는 슴새, 가마우지, 바다제비 등을 확인할 수 있었다.
Abstract
Nando Island is reported as one of the biggest breeding colonies of seabirds in South Korea, and is protected as a Natural Monument. This study was conducted between July to November 2015, to investigate the breeding population of Black-tailed gulls and their habitat on Nando Island. We estimated the breeding population of Black-tailed gulls (Larus crassirostris) using nest density. The mean nest density of Black-tailed gulls was 0.51 per 1 m2 (0.51 m-2), and the breeding population was approximately 26,760 individuals. The dominant vegetation was Echinochloa crusgalli and Agropyron tsukushiense var. transiens, which served as shelter and nest sites to Black-tailed gulls. The diet of Black-tailed gulls was mainly the fish, Japanese Anchovy Engraulis japonicas (48%). Other species which were found to breed on Nando Island were Streaked Sheawater (Calonectris leucomelas), Temminck’s Cormorant (Phalacrocorax capillatus), and Swinhoe’s storm petrels (Oceanodroma monorhis).
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