항공 및 선박 목시조사에 의한 서해 중부 연안해역의 상괭이(Neophocaena asiaeorientalis) 자원량 추정
Estimated Abundance of the Narrow-ridged Finless Porpoise Neophocaena asiaeorientalis by Aerial and Shipboard Sighting Surveys in the Middle Region of the Western Coast of Korea
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초록
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 November 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 km2 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.
Abstract
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 November 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 km2 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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