Relative importance of ocean currents and fronts in population structures of marine fish: a lesson from the cryptic lineages of the Hippocampus mohnikei complex

Autor: Fumihito Tashiro, Sang-Yun Han, Joon-Taek Yoo, Yoshiaki Kai, Jin-Koo Kim
Rok vydání: 2017
Předmět:
Zdroj: Marine Biodiversity. 49:263-275
ISSN: 1867-1624
1867-1616
DOI: 10.1007/s12526-017-0792-2
Popis: We found that Hippocampus mohnikei, the most common seahorse in East Asia, includes three clades with 2.8%–7.3% pairwise differences in their DNA cytochrome b (mtDNA cyt b) sequences, and all the clades are detected in the eastern Korea Strait (only in Geoje), Korea. Clades A and B have different demographic and divergence features via NJ-tree, TCS, mismatch, and BSP analysis from mtDNA cyt b, and the hybridization among the three clades was detected in nuclear DNA (the 1st intron RP1 of ribosomal protein S7 gene, ncDNA S7), implying a possibility of historic secondary contact or ancestral polymorphism. We also found the 1.4%-divergence-per-million-years molecular clock in mtDNA cyt b is appropriate for H. mohnikei through mismatch and BSP analysis comparison. Disconnection of each clade among the Yellow Sea, Korea Strait, and Japanese waters are related to different water masses, therefore there may exist an incomplete biogeographic barriers among them via discordant results between mtDNA and ncDNA. Therefore, a new analysis (such as microsatellite DNA or RAD-seq) must be considered to determine whether H. mohnikei constitutes a widely distributed panmictic population or several reproductively isolated populations.
Databáze: OpenAIRE
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