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http://dx.doi.org/10.35399/ISK.34.1.5

Distribution Status and Extinction Threat Evaluation of Ladislabia taczanowskii (Cypriniformes, Cyprinidae), a Cold Water Fish in Korea  

Choi, Kwang-Seek (Kosoo Ecology Institute)
Bae, Yang-Seop (Division of Life Sciences, Incheon National University)
Ko, Myeong-Hun (Kosoo Ecology Institute)
Publication Information
Korean Journal of Ichthyology / v.34, no.1, 2022 , pp. 34-43 More about this Journal
Abstract
A distribution survey was conducted from March to August 2021 to evaluate the distribution status, habitat characteristics, and threat of extinction of the Korean cold-water fish Ladislabia taczanowskii Dybowski (Cypriniformes, Cyprinidae). Historical distribution reports were divided into 1997~2005, 2006~2012, 2013~2019, and distribution surveyed 169 sampling sites, and 1,040 individuals were collected from 72 sites. Areas where the habitat was confirmed were Namhan River (27 stations), Han River (17 stations), Bukhan River (16 stations), Samcheok Osipcheon (4 stations), Yeongokcheon (3 stations), Gangneung Namdaecheon (2 stations), Jeoncheon (1 station), Chucheon (2 stations). The main habitat of L. taczanowskii was upstream of the river with a high altitude of more than 300 m, 2~30 m water flow width, 0.3~1.5 m water depth, and high ratio (50~90%) boulder bottoms. The main reasons for the decline in population size were assumed as river works, construction of reservoirs and bridges, discharge of contaminated water into the river, the inflow of summer vacationers, and weir. Compared to our results there exists evidence that states a 36.1% reduction in occupancy within 10 years, in a small appearance range (7,820 km2) and occupancy area (288 km2), number of disconnected locations (19 locations), and a decline in habitat quality. Therefore, L. taczanowskii is now considered as Vulnerable (VU) based on the results (VU A2ac, Near meets B1b (i, ii, iii)+B2b (i, ii, iii)) of IUCN Red List categories and criteria. Lastly, the conservation plan of Ladislabia taczanowskii was discussed.
Keywords
Ladislabia taczanowskii; cold-water fish; distribution; extinction threat evaluation;
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