This study conducted the morphological character analysis and DNA analysis of two Misgurnus species which live in Korean peninsula such as M. mizolepis and M. anguillicaudatus. I have compared them with the populations farmed in the Korean peninsula after being imported from China for taxonomic re-c...
This study conducted the morphological character analysis and DNA analysis of two Misgurnus species which live in Korean peninsula such as M. mizolepis and M. anguillicaudatus. I have compared them with the populations farmed in the Korean peninsula after being imported from China for taxonomic re-classification.
As a result of comparing the meristic characters of five natural groups, the cultured ones, and the conserved one from the National Institute of Fisheries Science, it was revealed that most of them overlapped and no significant difference has been identified among them. However, there was a significant difference in the number of lateral line scales between the cultured M. mizolepis and the natural one collected in Seogwipo-si and Seongmo-do. Meanwhile, the meristic characters of M. anguillicaudatus were almost similar in the domestic groups, but the number of lateral scales (139-150) in some of the Gangneung-si populations was less than other natural populations (174-185). This difference may play an important role in differentiating two Misgurns species, exhibiting a significant difference (P<0.05).
In particular, the caudal peduncle depth/caudal peduncle length (%) in M. anguillicaudatus exhibited regional difference: average 2.00±0.23 times for the Namhae-gun group, average 2.04±0.34 times for the Jinan-gun group, and average 1.83±0.31 times for Gangneung-si group. Unlike this work, the previous study has been just 1.6 times lower.
For the two species, the number of the pharyngeal teeth was clearly different, M. anguillicaudatus with 17-17 and M. mizolepis with 5-15. However, a significant difference by population of the both two species was not found. In addition, a clear difference in the lamina circularis was observed: M. mizolepis has a long rod shape with a saw-toothed at its end and M. anguillicaudatus has round shape. Moreover, the shape of the neurocranium bone basioccipital in all populations of M. mizolepis populations including the farmed population exhibited a fused structure, a single bone, that embraces the abdominal aorta together, whereas M. anguillicaudatus population showed a bifurcated structure being separated into two bones.
The analysis of the nucleotide sequence of the cytochrome b area of mitochondrial DNA showed inter-specific differences in M. mizolepis and M. anguillicaudatus. But for M. mizolepis, it shows no difference between the farmed and the natural groups as well as even in regional populations. On the contrast, M. anguillicaudatus exhibited showed regional differences such as in Boseong-gun, Sinan-gun, Jinan-gun, Gangneung-si, and Taean-gun.
As a result, this study revealed a prominent inter-specific difference between M. mizolepis and M. anguillicaudatus from the analyses of morphological characters and genetic perspectives. In the case of the M. mizolepis, however, the taxonomic characteristics from all the natural groups and domestically farmed group after being imported from China were almost identical to Paramisgurs dabryanus. As the use of the scientific name of M. mizolepis for the Korean population remains still confused, further discussions will be necessary.
This study conducted the morphological character analysis and DNA analysis of two Misgurnus species which live in Korean peninsula such as M. mizolepis and M. anguillicaudatus. I have compared them with the populations farmed in the Korean peninsula after being imported from China for taxonomic re-classification.
As a result of comparing the meristic characters of five natural groups, the cultured ones, and the conserved one from the National Institute of Fisheries Science, it was revealed that most of them overlapped and no significant difference has been identified among them. However, there was a significant difference in the number of lateral line scales between the cultured M. mizolepis and the natural one collected in Seogwipo-si and Seongmo-do. Meanwhile, the meristic characters of M. anguillicaudatus were almost similar in the domestic groups, but the number of lateral scales (139-150) in some of the Gangneung-si populations was less than other natural populations (174-185). This difference may play an important role in differentiating two Misgurns species, exhibiting a significant difference (P<0.05).
In particular, the caudal peduncle depth/caudal peduncle length (%) in M. anguillicaudatus exhibited regional difference: average 2.00±0.23 times for the Namhae-gun group, average 2.04±0.34 times for the Jinan-gun group, and average 1.83±0.31 times for Gangneung-si group. Unlike this work, the previous study has been just 1.6 times lower.
For the two species, the number of the pharyngeal teeth was clearly different, M. anguillicaudatus with 17-17 and M. mizolepis with 5-15. However, a significant difference by population of the both two species was not found. In addition, a clear difference in the lamina circularis was observed: M. mizolepis has a long rod shape with a saw-toothed at its end and M. anguillicaudatus has round shape. Moreover, the shape of the neurocranium bone basioccipital in all populations of M. mizolepis populations including the farmed population exhibited a fused structure, a single bone, that embraces the abdominal aorta together, whereas M. anguillicaudatus population showed a bifurcated structure being separated into two bones.
The analysis of the nucleotide sequence of the cytochrome b area of mitochondrial DNA showed inter-specific differences in M. mizolepis and M. anguillicaudatus. But for M. mizolepis, it shows no difference between the farmed and the natural groups as well as even in regional populations. On the contrast, M. anguillicaudatus exhibited showed regional differences such as in Boseong-gun, Sinan-gun, Jinan-gun, Gangneung-si, and Taean-gun.
As a result, this study revealed a prominent inter-specific difference between M. mizolepis and M. anguillicaudatus from the analyses of morphological characters and genetic perspectives. In the case of the M. mizolepis, however, the taxonomic characteristics from all the natural groups and domestically farmed group after being imported from China were almost identical to Paramisgurs dabryanus. As the use of the scientific name of M. mizolepis for the Korean population remains still confused, further discussions will be necessary.
주제어
#Misgurnus mizolepis Morphological characters Misgurnus anguillicaudatus cytochrome b Basioccipital bone Lamina circularis
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