백령도 점박이물범(Phoca largha)의 개체수 변동에 관한 연구
Seasonal and Annual Variations in the Occurrence of the Spotted Seal Phoca largha, on Baengnyeongdo Island
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The spotted seal Phoca largha a primary marine mammal found along the Korean coast, exhibits a seasonal migration pattern between breeding and feeding areas. In this study, population fluctuations of spotted seals were analyzed around Baengnyeongdo Island, Korea, from 2016 to 2021. Field surveys were conducted at two major haulout sites, Mulbeom rocks and Yeonbong rocks, during low tide between April and November of each year. The results indicate that the highest number of spotted seals was observed in summer, particularly in August or September. Mulbeom rocks consistently accommodated more spotted seals than Yeonbong rocks, suggesting that it is a more suitable haulout site for the spotted seals. The recorded population was approximately 200 spotted seals, showing a slight decrease when compared with previous surveys conducted in 2000–2002 and 2006–2008. This decline could be attributed to overhunting and habitat degradation. Fluctuations in the number of spotted seals could also be influenced by short-term factors such as weather conditions. Further research incorporating drone surveys and photo-identification will improve our understanding of population dynamics and support conservation measures for spotted seals in this region.
Abstract
The spotted seal Phoca largha a primary marine mammal found along the Korean coast, exhibits a seasonal migration pattern between breeding and feeding areas. In this study, population fluctuations of spotted seals were analyzed around Baengnyeongdo Island, Korea, from 2016 to 2021. Field surveys were conducted at two major haulout sites, Mulbeom rocks and Yeonbong rocks, during low tide between April and November of each year. The results indicate that the highest number of spotted seals was observed in summer, particularly in August or September. Mulbeom rocks consistently accommodated more spotted seals than Yeonbong rocks, suggesting that it is a more suitable haulout site for the spotted seals. The recorded population was approximately 200 spotted seals, showing a slight decrease when compared with previous surveys conducted in 2000–2002 and 2006–2008. This decline could be attributed to overhunting and habitat degradation. Fluctuations in the number of spotted seals could also be influenced by short-term factors such as weather conditions. Further research incorporating drone surveys and photo-identification will improve our understanding of population dynamics and support conservation measures for spotted seals in this region.
참고문헌 (20)
- Altukhov AV, "A comparison of different methods to estimate walrus (Odobenus rosmarus) abundance on haulout sites", Proceedings of Marine Mammals of the Holarctic, pp.24~32 (2020)
- Status review of the spotted seal (Phoca largha), "Boveng PL", National Technical Information Service, 1~153, pp.NOAA Technical Memorandum NMFS-SWFSC-200 (2009)
- "Natural Monument" (2024)[URL]
- Dong JH, "Estimates of historical population size of harbour seal(Phoca largha)in Liaodong Bay", Mar Sci, 3, pp.26~31 (1991)
- Estes JA, "Exploitation of marine mammals : r-selection of K-strategists?", J Fish Res Board Can, 36, pp.1009~1017 (1979)[DOI]
- Frost KJ, "Encyclopedia of Marine Mammals", pp.928~931 (2018), Academic Press
- Jefferson TA, "Marine Mammals of the World: A Comprehensive Guide to their Identification", pp.592~ (2015), Academic Press
- Katona S, "Are cetacea ecologically important?", Oceanogr Mar Biol Annu Rev, 26, pp.553~568 (1988)
- Kim HW, "Validity of photo-identification method for spotted seals on Baekryongdo, Korea", Korean J Fish Aqua Sci, 43, pp.340~344 (2010)[DOI]
- Kim HW, "A review on the status of Pinnipeds in Korea", Korean J Fish Aqua Sci, 54, pp.231~239 (2021)[DOI]
- Kim HW, "First satellite tracking of a free-ranging spotted seal(Phoca largha)from the Baengnyeongdo Island", Fish Aqua Sci, 26, pp.669~677 (2023)[DOI]
- "National Species List" (2024)[URL]
- "Marine Protected Species" (2024)[URL]
- Park TG, "Distribution of the spotted seal, Phoca largha, along the Coast of Baekryongdo", Korean J Fish Aqua Sci, 43, pp.659~664 (2010)[DOI]
- Shibuya M, "Use of haul-out sites by spotted seals(Phoca largha)on Rebun and Todojima Islands in the Japan Sea from 2008 to 2009", Mammal Study, 39, pp.173~179 (2014)[DOI]
- Wang PL, "Distribution, ecology and resource conservation of the spotted seal in the Huanghae and Bohae Seas", Acta Oceanologica Sinica, 5, pp.126~133 (1986)[DOI]
- Wang PL, "Survey on the distribution of spotted seal in the Bohai Sea", Oceanol Limnol Sin, 7, pp.7~11 (1988)
- Won C, "Abundance, seasonal haul-out patterns and conservation of spotted seals Phoca largha along the coast of Bak-ryoung Island, South Korea", Oryx, 38, pp.109~112 (2004)[DOI]
- Yan HK, "Abundance, habitat conditions, and conservation of the largha seal(Phoca largha)during the past half century in the Bohai Sea, China", Mammal Study, 43, pp.1~9 (2018)[DOI]
- Zhaobin P, "Legal analysis on the protection and development of the spotted seal population from a multi-dimensional perspective", Arch Community Med Public Health, 9, pp.11~15 (2023)[DOI]