멸종위기어류 다묵장어 Lethenteron reissneri (Petromyzontiformes: Petromyzontidae)의 분포 및 서식지 특성 = Distribution Status and Habitat Characteristics of the Endangered Species, Lethenteron reissnerl (Petromyzontlformes: Petromyzontldae) In Korea

다국어 초록 (Multilingual Abstract)

The distribution status and habitat characteristics of the endangered species, Lethen-teron reissneri were investigated in 2011~2012 in Korea. During the study period, L. reissneri were collected 60 stations among 755 sampling stations investigated. The total numbers of ammocoetes and adults were 208 and 435, respectively from eight stations of the Han River drainage system, four stations of Geum River drainage system, 32 stations of Seomjin and Yeongsan River drainage systems, and 16 stations of Nakdong River drainage system. The Han and Geum river drainage systems, the Sapkyo Stream and independent streams running toward the East Sea were estimated to have suffered sudden reductions of population density, whereas the Seomjin River drainage system show-ed increased population density compared with historic occurrence records. L. reissneri inhabited the middle-upper stream of clean water with well-developed rapids and lots of aquatic organisms. Accord-ing to IUCN Red List categories and criteria L. reissneri was assessed to be vulnerable (VU) [B2ab (ii,iii,iv,v);D1] because of the rapid reduction of the occupying areas and the small number of mature individuals. Besides the distribution status and habitat characteristics we discussed the conservation strategies of L. reissneri.

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