ミナミメダカ琉球型個体群における他個体群の放流による遺伝的撹乱の初事例

資料種別:
論文(リポジトリ)
責任表示:
今井, 秀行 ; 米沢, 俊彦 ; 立原, 一憲 ; Imai, Hideyuki ; Yonezawa, Toshihiko ; Tachihara, Katsunori
言語:
日本語
出版情報:
日本生物地理学会 — The Biogeographical Society of Japan, 2017-01-20
著者名:
今井, 秀行
米沢, 俊彦
立原, 一憲
Imai, Hideyuki
Yonezawa, Toshihiko
Tachihara, Katsunori
続きを見る
掲載情報:
日本生物地理学会会報 = Bulletin of the Bio-geographical Society of Japan
ISSN:
0067-8716  CiNii Articles  Webcat Plus  JAIRO
巻:
71
開始ページ:
121
終了ページ:
129
バージョン:
publisher
概要:
The current study examined the distribution of minami-medaka (Oryzias latipes) across the Ryukyu Archipelago in Japan to assess if the Ryukyu subpopulation as described by Sakaizumi et al. (1983) may be significantly divergent. Between 2003 and 2010, O. latipes were sampled from across Japan and populations compared using two genetic markers, an allozyme locus (aspartate aminotransferase; Aat) originally screened by Sakaizumi et al. (1983) and a new PCR-RFLP mtDNA marker based on the ND1 region. Laboratory trials showed that the Ryukyu subpopulation of O. latipes crossed with the Eastern subpopulation produced viable hybrids possessing both alleles Aatb and Aatc confirming that this marker will be effective for distinguishing natural hybrids between the Ryukyu subpopulation and other subpopulations. Populations distributed from the Amamioshima Islands to the Okinawa Islands all conformed to Ryukyu subpopulation genotypes and were fixed for allele Aatc. In addition, Okinawa islands populations were discriminated for the first time successfully from other subpopulations based on haplotype 5 (PCR-RFLP marker). A population at Chinen on Okinawajima Island possessed different genotypes to other Ryukyu subpopulations suggesting that it may have resulted from an introduction from a non-native source. Genetic introgression from other non-native subpopulations of O. latipes is the first case found in the Ryukyu Archipelago. It will be important in the future therefore, to apply the genetic markers used here to periodically monitor the Ryukyu subpopulation to conserve unique regional genetic diversity. 続きを見る
URL:
http://hdl.handle.net/20.500.12000/37568
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