강화도 논에서 저어새(Platalea minor)의 섭식행동 = Feeding Behavior of Black-faced Spoonbills Platalea minor on Rice Paddy in Gangwha Island, Korea

다국어 초록 (Multilingual Abstract)

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.

국문 초록 (Abstract)

본 연구는 번식기에 논을 이용하는 저어새의 섭식행동에 논의 다양한 환경요소가 어떤 영향을 주는지 알아보고자실시되었다. 2017년 4월부터 6월, 2018년 4월부터 6월까지 한 달에 3회씩 강화도 논을 대상으로 저어새의 개체수를조사하였다. 저어새가 영향을 받을 것으로 예상되는 환경요소로 수심, 경작에 따른 논의 구조적 형태, 잠재먹이원의생물량을 선정하여 측정하였고, 논의 환경에 따른 저어새의 섭식행동의 차이를 알아보기 위하여 관찰된 섭식행동을촬영하였다. 조사결과 저어새는 번식기간 중 4월 말부터 5월 말까지 논에 가장 많은 수가 도래했다. 총 308마리의개체 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 않은논의 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 부리를젓는 횟수는 섭식효율 및 섭식성공률과 상관관계가 없었고, 논의 구조적 형태와도 관련이 없었다.

참고문헌 (Reference)

• 1 김인철, "한국에서 저어새(Platalea minor)의 번식현황과 섭식생태에 관한 연구" 한국교원대학교 대학원 2006
• 2 김수경, "충남 예산군 예당저수지 수변 농경지의 어류와 양서류 분포특성" 한국환경생태학회 30 (30): 48-57, 2016
• 3 최승혜, "봄철 논습지에 도래하는 도요⋅물떼새의 서식지 이용과 개체군 변동" 한국환경농학회 33 (33): 334-343, 2014
• 4 남형규, "봄철 논습지를 이용하는 도요물떼새류의 먹이자원에 관한 연구" 한국환경생물학회 35 (35): 452-460, 2017
• 5 정미라, "논에 사는 미꾸리류의 서식 환경 특성" 한국교원대학교 대학원 2010
• 6 남형규, "논습지에 도래하는 수조류의 서식지 이용과 개체군 특성" 한국환경농학회 31 (31): 359-367, 2012
• 7 김재옥, "논 중간 낙수기에 미꾸라지 피난처로서 둠벙의 기능 평가" 한국환경농학회 30 (30): 37-42, 2011
• 8 한민수, "논 생태계에서 영농방법에 따른 미꾸라지개체군의 변동 요인 분석" 한국환경농학회 32 (32): 24-34, 2013
• 9 Lee, P. F., "Wintering habitat characteristics of Black-faced Spoonbill (Platalea minor) at Chi-Ku Taiwan" 6 (6): 67-78, 1995
• 10 Noh, S. A., "Wintering Ecology of the Black-faced Spoonbill (Platalea minor) in Seongsanpo, Jeju Province, South Korea" Kyung Hee University 2015
• 11 Choi, C. Y., "Wintering Ecology and Management of the Black-faced Spoonbill (Platalea minor) in Seonganpo, Jeju Province, Korea" Seoul National University 2004
• 12 Elphick, C. S., "Why study birds in rice fields?" 33 (33): 1-7, 2010
• 13 Minagawa, A., "Water management in unimproved paddy fields connected with dual-purpose-channel and those state of use by fishes. Transactions of the Japanese Society of Irrigation" 74 (74): 65-72, 2006
• 14 Fujioka, M., "Value of fallow farmlands as summer habitats for waterbirds in a Japanese rural area" 16 (16): 555-567, 2001
• 15 BirdLife International, "Threatened birds of Asia: the BirdLife International Red Data Book" BirdLife International 2001
• 16 Lane, S.J., "The impact of changes in irrigation practices on the distribution of foraging egrets and herons (Ardeidae) in the rice fields of central Japan" 83 (83): 221-230, 1998
• 17 van Wetten, J.C., "The food ecology of the Spoonbill. Platalea leucorodia" 49 (49): 1-59, 1986
• 18 Jeong, M. S., "Temporal and Spatial Changes in the Diets of Young Black-faced Spoonbill (Platalea minor) revealed by Stable Isotope Analysis" Seoul National University 2014
• 19 Kim, J. K., "Researches on the habitat status and characteristics of Black-faced Spoonbill(Platalea minor) during breeding season in Ganghwa province" Korea National Open University 2018
• 20 R Core Team, "R: A Language and Environment for Statistical Computing"
• 21 BirdLife International, "Platalea minor. The IUCN Red List of Threatened Species 2017: e.T22697568A119347801"
• 22 Angermeier, P.L., "Karr(1984)Relationships between woody debris and fish habitat in a small warmwater stream" 113 (113): 716-726, 1984
• 23 Yu, Y. T., "International Black-faced Spoonbill Census 2017" Black-faced Spoonbill Research Group, The Hong Kong Bird Watching Society 2018
• 24 Yu, Y. T., "Habitat use of the Black-faced Spoonbill" 27 (27): 129-134, 2004
• 25 Swennen, C., "Food and feeding behavior of the Black-faced Spoonbill" 28 (28): 19-27, 2005
• 26 Yu, Y.T., "Feeding of wintering black-faced spoonbills in Hong Kong: when and how long?" 27 (27): 135-140, 2004
• 27 Erwin, R. M., "Differences in the feeding behavior of little egrets (Egretta garzetta) in two habitats in the Camargue, France" 97 (97): 534-538, 1985
• 28 Chong, J. R., "Conservation and research of Black-faced Spoonbills and their habitats" Wild Bird Society of Japan 47-53, 2000
• 29 Kwon, I. K., "Breeding and Conservation Biology of the Black-faced Spoonbill Platalea minor in Korea" Kyung Hee University 2017
• 30 Stafford, J. D., "Avian foods, foraging and habitat conservation in world rice fields" 33 (33): 133-150, 2010
• 31 Yeung, C. L., "Assessment of the historical population size of an endangered bird, the black‐faced spoonbill (Platalea minor) by analysis of mitochondrial DNA diversity" 9 (9): 1-10, 2006
• 32 Song, J. G., "A study of behavioral ecology of Eurasian Spoonbill(Platalea leucorodia) wintering in Goheung bay, Jeollanam-do, Korea" Chosun University 2012