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RISS 인기검색어
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- 저자 : Namgyu Uh (검색결과 2 건)
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First satellite tracking of a free-ranging spotted seal (Phoca largha) from the Baengnyeongdo Island
Hyun Woo Kim,Namgyu Uh,Seulhee Lee 한국수산과학회 2023 Fisheries and Aquatic Sciences Vol.26 No.11
The spotted seal (Phoca largha) in the Yellow Sea has declined due to poaching and habitat destruction. To aid conservation efforts, Argos satellite tracking were used to monitor the movements of a free ranging spotted seal around Baengnyeongdo Island. The satellite-transmitting tag successfully attached to the seal provided 1,556 location data collected during 107 days. The seal mostly moved between two haul-out sites, Yeonbong Rock and Mulbeom Rock. From October 6th to December 12th, the seal stayed within a 7 km radius of Yeonbong Rock. However, as the signal was lost, it was not possible to identify when the seal started to migrate from Baengnyeongdo Island to winter breeding area. This study provide understanding into the habitat preferences and movement patterns of spotted seals around Baengnyeongdo Island, contributing to the conservation and management of this species. Further research with more individuals and different age groups is essential to understand their habitat preference and develop effective conservation measures for the spotted seal population in the Yellow Sea.
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항공 및 선박 목시조사에 의한 서해 중부 연안해역의 상괭이(Neophocaena asiaeorientalis) 자원량 추정
이종희 ( Jong Hee Lee ),이경리 ( Kyunglee Lee ),어남규 ( Namgyu Uh ),김민주 ( Min Ju Kim ),조유나 ( Yuna Cho ),김현우 ( Hyun Woo Kim ),박겸준 ( Kyum Joon Park ) 한국수산과학회 2023 한국수산과학회지 Vol.56 No.6
This study was conducted to estimate the abundance of narrow-ridged finless porpoises Neophocaena asiaeorientalis in the West Coast of Korea, where they predominantly inhabit. Sighting surveys were conducted in March and Novem ber 2021-2022 using vessels and aircraft during the same time periods and along the same survey transects. The aerial surveys yielded significantly more sightings than shipboard surveys, with 8.5-21.6 times the abundance and 6.3-16.9 times the number of observations. The detection rates were 0.000-0.047 and 0.0103 to 0.539 per km<sup>2</sup> for shipboard and aerial surveys, respectively. The densities were estimated to be 0.003-0.061 and 0.236-1.898 individuals per km2 in the shipboard and aerial surveys, respectively. The shipboard survey conducted in March 2022 and the aerial survey conducted in November 2021 had the highest detection rates and abundance. In the coastal waters, shipboard sighting surveys face numerous challenges due to factors such as fishing gear, islands, and shallow water depths. In contrast, aerial surveys have the advantage of a shorter survey period and are less affected by weather, fisheries, coastal lines, and other variables. Thus, they are highly suitable for studying narrow-ridged finless porpoises in the coastal areas of the West Sea.
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