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Research on the Size, Formation and Tendency to Evade the Road of the Feeding Flocks of Crane Species - Centering on the Effect of Road vs. Traffic Condition -  

Yoo, Seung-Hwa (Korea Institute of Environmental Ecology)
Lee, Ki-Sup (Korea Institute of Environmental Ecology)
Kim, In-Kyu (Korea Institute of Environmental Ecology)
Kang, Tae-Han (Korea Institute of Environmental Ecology)
Lee, Han-Soo (Korea Institute of Environmental Ecology)
Publication Information
Korean Journal of Environment and Ecology / v.23, no.1, 2009 , pp. 41-49 More about this Journal
Abstract
This research conducted a survey on the feeding crane's size, formation and distribution distance subsequent to road pattern and feeding flock's size during the wintering season eight times at the Cheolwon basin in Korea from December 2005 until February 2006. The survey results are as follows: First, the feeding flocks of the Red-crowned and White-naped Crane were found to mainly consist of two to four individuals. Mono-specific feeding flocks were more identified than hetero-specific feeding flocks in both Red-crowned and White-naped Cranes. There existed a significant difference in the ratio by size between the feeding Red-crowned and White-naped Cranes. The crane's average distribution distance from the paved road was much farther than from the unpaved road, paved farm road and unpaved farm road. In case of the white-naped crane, there was a difference in its distance length from between the road and farm road and there existed a significant difference only in the paved road in the distance length by road pattern between these two bird species[Red-crowned and White-naped Crane]. Such a result indicates that crane species don't prefer the road with frequent vehicular traffic to the road with low vehicular traffic. 5 or more individuals of feeding flocks of the Red-crowned Crane were located at a farther distance length from the paved road comparing to less than 5 individuals of the whole feeding flocks and less than 5 individual feeding flocks. 5 or more individuals of feeding flocks of the White-naped Crane were located at a farther distance length from the paved road, paved farm road and unpaved farm road than less than 5 individuals of feeding flocks of the White-naped Crane; however, there existed no difference in distance length subsequent to their group size. Conclusively, it was found out that the flocks with a larger size were more greatly affected by interrupting factors. Considering such results, there seems to be a more relation to the fact that larger size feeding flocks of crane species have a higher efficiency in the lookout for their surroundings.
Keywords
FEEDING FLOCK SIZE; ROAD EFFECT; TRAFFIC EFFECT; DISTURBANCE FACTOR; DETACHED DISTANCE;
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