Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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A Case Study on Foraging Behavior of Oriental White Storks (Ciconia boyciana) in the Variation of Prey Density and Water Depth

먹이 밀도와 수심에 따른 황새(Ciconia boyciana)의 섭식 행동에 대한 사례연구

  • Sung, Ha-Cheol (Department of Biology Education, Korean National University of Education) ;
  • Kim, Jung-Hee (Department of Biology Education, Korean National University of Education) ;
  • Cheong, Seok-Wan (National Ecological Institute, Ministry of Environment) ;
  • Kim, Su-Kyung (Department of Biology Education, Korean National University of Education) ;
  • Jo, Jee-Yeon (Department of Biology Education, Korean National University of Education) ;
  • Cheong, Mi-Ra (Department of Biology Education, Korean National University of Education) ;
  • Choi, Yu-Seong (Department of Biology Education, Korean National University of Education) ;
  • Park, Shi-Ryong (Department of Biology Education, Korean National University of Education)
  • 성하철 (한국교원대학교 생물교육과) ;
  • 김정희 (한국교원대학교 생물교육과) ;
  • 정석환 (환경부 국립생태원건립추진기획단) ;
  • 김수경 (한국교원대학교 생물교육과) ;
  • 조지연 (한국교원대학교 생물교육과) ;
  • 정미라 (한국교원대학교 생물교육과) ;
  • 최유성 (한국교원대학교 생물교육과) ;
  • 박시룡 (한국교원대학교 생물교육과)
  • Received : 2009.02.04
  • Accepted : 2009.03.24
  • Published : 2009.05.31
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Abstract

The Oriental white stork (Ciconia boyciana) is an endangered species in Korea as well as in the world. In order to provide information on foraging habitats for releasing storks to the wild, we studied the foraging behavior of the species according to different food densities and water levels. We released two individuals, male and female, after enclosing a study site with a fence and cutting out a part of two or three primary feathers. Research was conducted from 20 June to 16 August 2008 at Whawon-ri, Mewon-myung, Chungcheongbuk-do, South Korea. We investigated habitat patch usage, foraging efficiency, and foraging methods of the feeding individuals in the different food densities and water levels. The storks invested more for foraging time and trials, and they captured more food in a habitat of high food density than others. The female invested more time and captured food most in a habitat of lowest water depth while the male in a habitat of middle water depth. However, foraging efficiency did not differ significantly among habitats of food density and water depth, and only differed between male and female by ways of foraging method. From this study we suggest that the storks select foraging habitats and foraging methods under different conditions of food density and water depth.

멸종위기종 황새의 야생 방사를 위한 먹이 서식지 조성 시 필요한 정보를 제공하고 야생 황새의 먹이 서식지 보호와 보존을 위한 기초 자료를 제공하고자 연구를 시작하였다. 이를 위하여 충북 청원군 미원면 화원리에 있는 산지형 습지 일부에 울타리를 치고 황새 암수의 한 쪽 날개의 첫째날개깃 일부를 잘라 방사하여, 6월 20일부터 8월 16일까지 서식지 먹이 밀도와 수심 변화에 따른 서식지 이용률 및 섭식행동 특성을 파악하였다. 황새는 밀도가 높은 서식지에서 오랫동안 머물며 섭식시도와 섭식량을 증가시켰으며 수심에 따라 암컷은 수심이 얕은 서식지에서 그리고 수컷은 중간 깊이의 서식지에서 섭식시간과 섭식량을 증가시켰다. 그러나 섭식효율성은 밀도와 수심과 관련없이 의미있는 차이가 없었다. 단지 암수 간의 섭식효율성이 밀도에 따라 그리고 수심이 다른 서식지에서 섭식행동에 따라 다르게 나타났다. 따라서 본 연구를 통하여 반자연적 환경에 방사된 황새가 먹이 밀도에 따라 섭식 지역을 선택할 수 있음을 보여주었고 섭식효율성은 개체에 따라 혹은 섭식 방법에 따라 다르게 나타날 수 있음을 보여주었다.

Keywords

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