著者

向井 貴彦 西田 睦

出版者

The Ichthyological Society of Japan

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

vol.52, no.2, pp.133-140, 2005-11-25 (Released:2010-06-28)

参考文献数

28

被引用文献数

4

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The geographical distributions of mitochondrial DNA (mtDNA) haplo-types in non-indigenous populations of a freshwater goby, Tridentiger brevispinis, were investigated. Although 26 mtDNA haplotypes were obtained from 168 individuals (including a closely-related species, T. obscurus) representing 36 indigenous populations, only two haplotypes (I-Al and III-B1) were found in 59 individuals of T.brevispinis from 12 non-indigenous populations. Many of the latter had the I-Al haplotype, thepopulations being located near indigenous populations having the same haplotype. A non-indigenous population in Lake Biwa had the III-B1 haplotype, the lake being close to the natural distribution area of that haplo-type. Thus, the non-indigenous populations of T. brevispinis may have become es-tablished following artificial transplantations from nearby populations. The III-B 1 haplotype, however, was also scattered throughout geographically-distant, non-in-digenous populations, its dispersal possibly having been a consequence of trans-plantation of Ayu (Plecoglossus altivelis), from Lake Biwa, accompanied by T. brevispinis. However, the primary cause of the expansion of non-indigenous goby populations retains unclear.