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사수도에 번식하는 슴새의 둥지 사용률의 변화 및 집쥐의 포식률

Variation in Breeding Burrows of Streaked Shearwaters Breeding in Sasu Island, and Predation Rates by Norway Rats

  • 남기백 (경희대학교 이과대학 생물학과.한국조류연구소) ;
  • 이경규 (전라남도 신안군청 해양수산과) ;
  • 황재웅 (경희대학교 이과대학 생물학과.한국조류연구소) ;
  • 유정칠 (경희대학교 이과대학 생물학과.한국조류연구소)
  • Nam, Ki-Baek (The Korea Institute of Ornithology, Department of Biology, College of Sciences, Kyung Hee University) ;
  • Lee, Kyung-Gyu (Maritime Affairs and Fisheries Division, Shinan-gun Office) ;
  • Hwang, Jae-Woong (The Korea Institute of Ornithology, Department of Biology, College of Sciences, Kyung Hee University) ;
  • Yoo, Jeong-Chil (The Korea Institute of Ornithology, Department of Biology, College of Sciences, Kyung Hee University)
  • 투고 : 2014.01.08
  • 심사 : 2014.03.12
  • 발행 : 2014.03.30

초록

The seabird plays an important role as one of the indicator species for the status of and changes within marine ecosystems. Therefore, the conservation of seabirds and their habitats is important for maintaining the structure and function of marine ecosystems. Biological invasions affect most ecosystems on oceanic islands. In particular, Rattus spp. is the invasive species with the greatest impact on the seabird population. Introduced predators, like rats, severely affect seabirds and endanger them worldwide. The breeding population of Streaked Shearwaters Calonectris leucomelas in Sasu Island is one of biggest seabird colonies in Korea, and the Norway Rat Rattus norvegicus is known as an alien predator in this island. In this study we investigated rates of burrow occupancy and breeding success of Streaked Shearwaters for 7 years, and the impact of Norway Rats on the breeding success of Streaked Shearwaters breeding in Sasu Island for 4 years. Our results show that the percentage of breeding burrows decreased according to breeding stage during several years in the monitoring period, and that predation by the Norway Rat was the main cause in hatching failures. Consequently, although our results indicate that their breeding population is not likely to decline, Norway Rats have been affecting the breeding status of Streaked Shearwaters on Sasu Island during the last decade.

키워드

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