著者
北西 滋 向井 貴彦 山本 俊昭 田子 泰彦 尾田 昌紀
出版者
公益社団法人 日本水産学会
雑誌
日本水産学会誌 (ISSN:00215392)
巻号頁・発行日
vol.83, no.3, pp.400-402, 2017 (Released:2017-05-22)
参考文献数
17
被引用文献数
1

サクラマス自然分布域におけるサツキマスによる遺伝的撹乱の有無を調べるため,両亜種の在来分布域4道県(サクラマス:北海道,富山県,岐阜県,鳥取県;サツキマス:岐阜県)の個体を対象に,マイクロサテライトDNA解析をおこなった。帰属性解析をおこなった結果,神通川水系上流域(岐阜県)と,甲川および陸上川(鳥取県)において遺伝的撹乱が認められた。
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.50, no.1, pp.71-76, 2003-05-23 (Released:2010-06-28)
参考文献数
24
被引用文献数
1

Phylogenetic relationships among 4 major geographic population groups (San-in-Biwa-Ise, East Seto, West Seto and West Kyushu) of Japanese freshwater goby Odontobutis obscura (Perciformes: Gobioidei: Odontobutidae) and related species O. hikimius were inferred from partial nucleotide sequences of the mitochondrial 12S and 16S rRNA genes. The resultant mitochondrial DNA (mtDNA) phylogeny was consistent with that based on the previous allozyme analysis. This phylogeny showed that specimens from the Sagami River system in Kanagawa Prefecture, Kanto District, were extremely close to fish from the West Seto group, suggesting the formers to have been descended from individuals artifi-cially introduced from the range of the latters. Judging from the fact that about 40 individuals of the goby were easily collected by a person in 2 hrs, the Kanto popu-lation did not seem to be small, and thus might be disturbing the native fauna in the river system.
著者
新田 恭大 向井 貴彦 淀 太我 吉岡 基 NITTA Yasutomo MUKAI Takahiko YODO Taiga YOSHIOKA Motoi
出版者
三重大学大学院生物資源学研究科
雑誌
三重大学大学院生物資源学研究科紀要
巻号頁・発行日
vol.40, pp.45-64, 2014-03-01

The fish fauna of the Ano River in Mie Prefecture, central Japan, was surveyed between May 2013 and August 2013. A total of 1242 individuals of 38 species belonging to 15 families were collected from 13 stations and 3 species belonging to 3 families were visually confirmed. Six species, Dasyatis akajei, Opsariichthys uncirostris uncirostris, Microphis(Oostethus)brachyurus brachyurus, Plectorhinchus cinctus, Kuhlia marginata, Rhinogobius sp. BF, Rhinogobiussp. OM were newly added to the fish fauna of the Ano River. Six alien species were collected and seven species of threatened fishes in red list of Ministry of Environment Japan or in red databook of Mie Prefecture, such as Cottus reinii were collected. Two of these alien species, Micropterus salmoides and Lepomis macrochirus macrochirus were designated “Invasive Alien Species” by Invasive Alien Species Act (Law of Japan). Other four species, Acheilognathus rhombeus, Opsariichthys uncirostris uncirostris, Rhinogobius sp. OM, and Tachysurus nudiceps were domestic alien speceies and the former three species were evidently introduced from Lake Biwa basin. It seemed that a dam(1.8m in hight) which constructed in the middle leach of the river disturb diadromous migration. Control of alien species and improvement of the fish way on the dam are necessary to conserve fish biodiversity in the Ano River.
著者
向井 貴彦
出版者
日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.48, no.1, pp.1-18, 2001-05-25 (Released:2011-07-04)
参考文献数
130
被引用文献数
1

Hybridization and introgression have been considered important aspects in the speciation process and evolution of reproductive barriers. Although most hybrid zones of animals have been consideredas ‘tension zones, ’ maintained by dispersal/selection balance of hybrids, many of the hybrid zones of freshwater fishes may lead to hybrid swarm. On the other hand, some of the hybrid zones of diadromous, brackishwater and maritime fishes may, infact, be ‘tensionzones’ and widespread introgression of genes. These differences may be dependent upondispersal abilities, because migration from ‘pure’ populations to a hybrid zone (and vise versa) can be expected in widely dispersible species, but not in drainage-restricted freshwater fishes. Although many of the examples of fish hybrid zones may have originated fbllowing secondary contact of geographically-isolated populations, reinfbrcement of reproductive barriers have not appeared. In particular, hybrid swarms of freshwater fishes have often emerged as hybrid-origin species. In some cases in brackishwater species, mtDNA trees have suggested long term hybridization, there being no evidence for reinfbrcement. One of the reasons fbr the continuing existence of hybrid zones (and genetic differences among populations) may be environmental selective pressures in ecotones, because ‘tensionzones’ of fishes originally fbrmed in a transitional zone between different environments.
著者
佐藤 千夏 向井 貴彦 淀 太我 佐久間 徹 中井 克樹
出版者
日本魚類学会
雑誌
魚類学雑誌 (ISSN:00215090)
巻号頁・発行日
vol.54, no.2, pp.225-230, 2007-11-26 (Released:2011-12-02)
参考文献数
18
被引用文献数
1

The geographical distribution of mtDNA haplotypes of non-indigenous smallmouth bass (Micropterus dolomieu) populations in Japan were examined utilizing nucleotide sequences of the mtDNA control region from 208 individuals collected from 20 localities. A total of three haplotypes (n, o and p), distinguished by a nucleotide substitution or an insertion/deletion of 294bp, were found in Japanese freshwater systems. In eastern Japan, most M. dolomieu populations had two haplotypes (n and p), the frequencies being similar among localities. On the other hand, haplotype n or p was fixed (or nearly fixed) in lakes and ponds in western Japan. These results suggested that the non-indigenous populations of smallmouth bass in Japan were initially established by an introduction into eastern Japan, the western Japanese populations being subsequently founded by relatively small num-bers of individuals.