Nippon Suisan Gakkaishi 72 (5), 905-910 (2006)

Genetic population structure of the spear squid Loligo bleekeri based on mitochondrial DNA

KINGO ITO,1* TAKASHI YANAGIMOTO,2 YOKO IWATA,3
HIROYUKI MUNEHARA4 AND YASUNORI SAKURAI3

1Aomori Prefectural Fisheries Research Center, Ajigasawa, Aomori 038-2761, 2Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Kushiro, Hokkaido 085-0802, 3Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611, 4Field Science Center for Northern Biosphere, Hokkaido University, Hakodate, Hokkaido 041-1613, Japan

The sequence of the mitochondrial DNA noncoding region 4 (mtDNA NC4) was analyzed to investigate the genetic population structure of the spear squid Loligo bleekeri using 545 individiduals captured at six sites around Japan. MtDNA NC4 sequences of 506-528 bp were determined. A total of 55 variable nucleotide sites were detected, defining 48 haplotypes. The average haplotype diversity (0.670) and average nucleotide diversity (0.003) indicated a low level of genetic diversity in the spear squid. Analysis of molecular variation (AMOVA) indicated that most of the genetic variation was distributed within populations. The analysis of haplotype frequency distribution and FST values showed no significant difference among the six sampling sites. These data indicate no genetic structuring of spear squid population around Japan.


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