한국환경생태학회지 (Korean Journal of Environment and Ecology)

  • 제33권2호
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  • Pages.168-177
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  • 2019
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  • 1229-3857(pISSN)
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  • 2288-131X(eISSN)
한국환경생태학회 (Korean Society of Environment and Ecology)
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강화도 논에서 저어새(Platalea minor)의 섭식행동

Feeding Behavior of Black-faced Spoonbills Platalea minor on Rice Paddy in Gangwha Island, Korea

  • 유성연 (경희대학교 생물학과) ;
  • 권인기 (국립생태원 멸종위기종복원센터) ;
  • 유정칠 (경희대학교 생물학과)
  • Yoo, Sung-Yeon (Department of Biology, Kyung Hee University) ;
  • Kwon, In-Ki (Research Center for Endangered Species, National Institute of Ecology) ;
  • Yoo, Jeong-Chil (Department of Biology, Kyung Hee University)
  • 투고 : 2019.01.07
  • 심사 : 2019.04.03
  • 발행 : 2019.04.30
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⟨ 이전 논문 다음 논문 ⟩

초록

본 연구는 번식기에 논을 이용하는 저어새의 섭식행동에 논의 다양한 환경요소가 어떤 영향을 주는지 알아보고자 실시되었다. 2017년 4월부터 6월, 2018년 4월부터 6월까지 한 달에 3회씩 강화도 논을 대상으로 저어새의 개체수를 조사하였다. 저어새가 영향을 받을 것으로 예상되는 환경요소로 수심, 경작에 따른 논의 구조적 형태, 잠재먹이원의 생물량을 선정하여 측정하였고, 논의 환경에 따른 저어새의 섭식행동의 차이를 알아보기 위하여 관찰된 섭식행동을 촬영하였다. 조사결과 저어새는 번식기간 중 4월 말부터 5월 말까지 논에 가장 많은 수가 도래했다. 총 308마리의 개체 중 86.4%(n=266)가 섭식행동을 하고 있었고 90.6%(n=279)가 성조였으며, 물이 없는 논에서는 발견되지 않았다. 강화도 논의 생물량은 어류의 산란기가 시작되는 5월부터 크게 증가하였으며 저어새가 관찰된 논과 관찰되지 않은 논의 생물량은 유의한 차이가 나타났다. 저어새의 섭식행동 분석 결과 논에 생물량이 많아지는 시기에 저어새의 섭식효율과 섭식성공률이 크게 증가하였고, 저어새의 분당 발걸음 수는 모내기를 한 논에서 크게 증가하였다. 분당 부리를 젓는 횟수는 섭식효율 및 섭식성공률과 상관관계가 없었고, 논의 구조적 형태와도 관련이 없었다.

This study was conducted to examine the impact of various environmental factors on the feeding behavior of black-faced spoonbills Platalea minor known to use rice fields during the breeding season. We surveyed the rice fields three times a month from April to June 2017 and from April to June 2018. We counted the number of black-faced spoonbills and measured the environmental factors such as the water depth, paddy type by cultivation stage, and biomass of potential prey that are expected to affect black-faced spoonbills. We also filmed the feeding behavior of black-faced spoonbills to examine differences in feeding behavior by environmental factors. The survey showed that the number of black-faced spoonbills reached its peak from late April to late May which was the breeding period. Among a total of 308 black-faced spoonbills observed, 86.4% (n=266) were observed feeding on rice paddies, 90.6% (n=279) were adults, and none was observed on dry paddies. The biomass of rice paddy increased significantly since May when fish started hatching, and there was a significant difference in the amount of biomass between the rice paddies where black-faced spoonbills were observed and other rice paddies. The analysis of the feeding behavior of black-faced spoonbills showed that the feeding efficiency and feeding success rate of black-faced spoonbills increased significantly when the amount of biomass soared and that the number of steps of black-faced spoonbills per minute increased greatly after rice planting was completed. The number of bill sweeping was not related to the feeding efficiency, feeding success rate, and paddy type by cultivation stage.

키워드

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