Geographic variations of the mottled skate, Beringraja pulchra
작성일 : 2017-07-03
작성자 : 김진구
In order to prove the fisheries-related
hypothesis of the presence of two local populations
of the mottled skate, Beringraja pulchra in the Yellow Sea (Sensu Jo et al., 2011),
the geographic variations of 90 individuals (in molecule) and 129 individuals (in morphology)
were investigated. The skates were collected from the middle Yellow Sea
(Daechungdo), southern Yellow Sea (Heuksando), and the middle East Sea (Ulleungdo)
using gill nets, bottom trawls and longlines. Comparing 471 base pairs of mitochondrial
DNA cytochrome c oxidase subunit I (mtDNA COI) sequences, only three haplotypes
(BR1–BR3) were found. The Daechungdo and Heuksando individuals displayed all
three haplotypes, whereas the Ulleungdo individuals displayed a single haplotype
(BR3). Pairwise fixation indices (FST) showed that the Daechungdo and Heuksando
individuals were not genetically distinguishable (with a value of −0.0344), whereas the
Ulleungdo individuals were clearly distinct from both the Daechungdo and Heuksando
individuals (with values of 0.6875 and 0.6871, respectively). Similar to the molecular
result, a canonical discriminant analysis based on seven morphometric characters
showed that the Ulleungdo individuals had positive values on the first axis, whereas
those from the other two locations had negative values, slightly differentiating the two
populations (East Sea population vs Yellow Sea population). This study is the first to
identify two populations of mottled skate in the northwest Pacific.
파일 : Beringraja-pulchra.pdf