Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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First Report of Annual Habitat Ranges in Black-tailed Gulls (Larus crassirostris) Breeding on Dokdo Island

독도에서 번식하는 괭이갈매기의 연간 서식 범위 첫 보고

  • Hong, Mijin (Department of Biology, College of Science, Kyung Hee University) ;
  • Kim, Miran (Korea National Park Research Institute, Korea National Park Service) ;
  • Lee, Ho (Korea National Park Research Institute, Korea National Park Service) ;
  • Cho, Sang-moon (Behavioral Science Laboratory, Sahmyook University)
  • 홍미진 (경희대학교 이과대학 생물학과) ;
  • 김미란 (국립공원공단 국립공원연구원) ;
  • 이호 (국립공원공단 국립공원연구원) ;
  • 조상문 (삼육대학교 행동과학연구소)
  • Received : 2019.06.10
  • Accepted : 2019.06.24
  • Published : 2019.06.30
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Abstract

Black-tailed gulls, Larus crassirostris, have been known as resident birds in Korea, but their wintering and breeding habitat ranges were little known about. We investigated the habitat ranges of Blacktailed gulls breeding on Dokdo Island - which is the eastern end of their breeding colonies in Korea. Three adult Black-tailed gulls were fitted with Global Positioning System data loggers in May 2018 and their positions were tracked for 9 days, 245 days and 365 days each respectively. Black-tailed gulls stayed on Dokdo Island until June for breeding purposes and moved down to the southern part of Japan for wintering. The following year, a Black-tailed gull started to move northward in February and returned to Dokdo Island in April. They traveled a total of $207,334-229,507km^2$ (MCP) throughout a whole year. Based on location density categories accounting for 50% of locations, they used 3,618 to $3,803km^2$ in area. Black-tailed gulls breeding on Dokdo Island used smaller habitat ranges during the wintering period than the other periods. This is the first report on the habitat ranges of Black-tailed gulls breeding on Dokdo Island.

Keywords

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Fig. 1. Location of Dokdo Island

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Fig. 2. Habitat ranges of Black-tailed gulls (ID. A114, A115, A116) on Dokdo Island (Black line: habitat range estimated by MCP; red line: habitat range estimated by KDE 50%; green line: habitat range estimated by KDE 95%). Location data of A114, A115 and A116 were collected for 245 days, 9 days and 365 days in respectively

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Fig. 3. Habitat ranges of ID. A114 from May 2018 to Jan 2019 (except Dec 2018) estimated by Kernel Density and MCP analysis

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Fig. 4. Habitat range of ID. A116 from May 2018 to May 2019 estimated by Kernel Density and MCP analysis

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Fig. 5. Habitat area of a Black-tailed gull (ID. A116) estimated by MCP from May 2018 to May 2019

Table 1. Location data of three Black-tailed Gulls on Dokdo Island

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Table 2. Habitat range of Black-tailed gulls breeding on Dokdo Island

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