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http://dx.doi.org/10.17663/JWR.2017.19.2.223

Temporal variation of wintering bird population and environmental factors in Donglim reservoir  

Park, Jongchul (Division of Ecological Survey Research, National Institute of Ecology)
Kim, Woo-Yuel (Division of Ecological Survey Research, National Institute of Ecology)
Publication Information
Journal of Wetlands Research / v.19, no.2, 2017 , pp. 223-229 More about this Journal
Abstract
This study analyzed the relationship between environmental factors and the temporal changes of the bird populations during the every January from 1999 to 2016 (18 years) in Donglim reservoir. 'Winter Waterbird Census of Korea' data by National Institute of Biological Resources were used for the bird population data, and principal component analysis and cluster analysis were used to analyze the changes of annual population. The average temperature of January and the average storage rate of the reservoir were used as environmental factors. According to the results of the study, the population changes in the study area can be explained by the increase and decrease of two water bird groups and a mountain bird group. The average temperature of the years when the population of water bird groups increased was more than $1.4^{\circ}C$ in comparison with the year when mountain birds increased. On the other hand, the influence of the water content was not clear. The visiting of Baikal Teal affected by temperature was a factor affecting the other group of water bird and a mountain bird group. The results of this study suggest that the temperature change affects the global spatial distribution of birds and the migration of large population species such as Baikal Teal affects species composition and populations of birds at local scale. Therefore, understanding of environmental changes at large scale and spatial distribution of species and flock contributes to understand the temporal variation of the bird population at regional or local scales.
Keywords
Baikal Teal; Mountain bird; Population; Storage rate; Temperature; Water bird;
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