Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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Egg Retrieval as a Source of Nests with Supernormal and Mixed Egg Clutch in Little Terns Sterna albifrons

쇠제비갈매기 Sterna albifrons의 과산란 및 이종 알 혼합 둥지 생성 원인으로서 알 회수 행동

  • Kim, Jeong-Hoon (Korea Institute of Ornithology and Department of Biology, Kyung Hee University) ;
  • Nam Hyung-Kyu (Korea Institute of Ornithology and Department of Biology, Kyung Hee University) ;
  • Fulton Graham R. (School of Natural Sciences, Centre for Ecosystem Management, Edith Cowan University) ;
  • Yoo Jeong-Chil (Korea Institute of Ornithology and Department of Biology, Kyung Hee University)
  • 김정훈 (경희대학교 한국조류연구소.생물학과) ;
  • 남형규 (경희대학교 한국조류연구소.생물학과) ;
  • ;
  • 유정칠 (경희대학교 한국조류연구소.생물학과)
  • Published : 2006.12.31
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Abstract

Ten supernormal clutches of little terns Sterna albifrons and seven clutches having mixed eggs by little terns and kentish plovers Charadrius alexandrinus were recorded during the breeding seasons of 2003$\sim$2005 at Ganwol lake, Hongsung-gun, Chungcheongnam-do, Korea. The frequency of egg retrieval by Little Terns was higher after the second egg laying regardless of the clutch size and incubation stage. The frequency of egg retrieval was high at all incubation stage. When experimental eggs were placed within 15 cm from the nests, the percentage of egg retrieval was highest (almost 100%). However the percentage dropped rapidly over 35$\sim$55 cm range and finally to zero at 60 cm distance. Little terns retrieved all kinds of eggs set near their nests regardless of its kind or size. This study suggests that egg retrieval by little terns may be a source of the nest with supernormal and mixed egg clutch observed in this species.

2003$\sim$2005년의 쇠제비갈매기 Sterna albifrons의 번식기 동안 충남 홍성군 간월호의 번식군집에서 총 10개의 과산란수의 둥지(nest with supernormal clutch)와 7개의 이종 알 혼합 둥지(nests with mixed species clutch, 쇠제비갈매기와 흰물떼새의 알이 혼합된 둥지)가 관찰되었다. 쇠제비갈매기의 알 회수 행동은 한 배 산란수와 관계없이 두 번째 알 산란 이후 높은 빈도를 보였다. 알 회수 행동은 모든 포란 단계에서 매우 높은 빈도로 나타났다. 쇠제비갈매기는 둥지에서 약 15 cm 떨어진 알에 대하여 높은 알 회수 행동 비율을 보였으나 35$\sim$55 cm의 거리에서 급격히 감소하였고 60 cm 거리에서는 알 회수 행동이 나타나지 않았다. 쇠제비갈매기는 알의 종류 및 크기와 관계없이 둥지 인근에 배치된 알들을 자신의 둥지로 편입시키는 행동을 보였다. 본 조사 결과는 쇠제비갈매기의 알 회수 행동이 과산란수의 둥지 및 이종 혼합 둥지를 생성할 가능성이 있음을 시사한다.

Keywords

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