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논문 기본 정보

자료유형
학술저널
저자정보
Hae-Ni Kim (Kyung Hee University) Jin-Won Lee (Kyung Hee University) Jeong-Chil Yoo (Kyung Hee University)
저널정보
한국조류학회 한국조류학회지 한국조류학회지 第24卷 第2號
발행연도
2017.12
수록면
25 - 40 (16page)
DOI
10.30980/KJO.2017.12.24.2.25

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초록· 키워드

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Understanding the fluctuation of population size plays a key role in the study of avian ecology and conservation biology. For recent several years, the number of great cormorants (Phalacrocorax carbo) wintering in Hangang river has considerably increased. However, the origin of these birds and the impact of them on the local environments is poorly known. Using the data from the bird census for winter migratory birds implemented by the National Institute of Biological Resources, we analyzed 17-year distribution data for cormorants acquired from over the country in order to infer the origin of Hangang population. Population size fluctuation for common mergansers (Mergus merganser) that have a similar foraging strategy to cormorants and northern shovelers (Anas clypeata) that have a different foraging strategy from cormorants were also analyzed to further understand the cause and effect of population size fluctuation of cormorants in Hangang. We found that the population size of cormorants appeared to increase not only in Hangang but also over the country, indicating that the growth of Hangang population may not be related to the population fluctuation of other sites in Korea. Similarly, the number of wintering mergansers and shovelers tended to increase across the country. In Hangang, however, the population size of mergansers has sharply decreased since 2009 while shoveler population tended to be stable, implying that possible physical changes of Hangang such as change in water depth may not directly affect the population size fluctuation of three species in this area. Rather, it is likely that the decreasing number of mergansers in Hangang may directly or indirectly be associated with the growth of cormorant population, although habitat use of cormorants and mergansers is not severely overlapped in temporal scale during wintering season. Further studies clarifying these species interaction, determining the impact of cormorant population on urban ecosystem and monitoring change of wintering bird community structure will be worthwhile.

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