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Title :日本の砂浜に生息するチョウセンハマグリ集団の遺伝的多様性と集団構造
Title alternative :Genetic diversity and population structure of Meretrix lamarckii from a Japanese sandy beach
Authors :山川, 矢敷 彩子
今井, 秀行
Authors alternative :Yamakawa, Ayako Yashiki
Imai, Hideyuki
Issue Date :20-Dec-2014
Abstract :Genetic diversity at 14 allozyme loci was examined for 12 local samples of Meretrix lamarckii from mainland Japan, an adjacent island (Tanegashima), and one sample of Meretrix sp1. collected from Iriomote Island. An unweighted pair group method with arithmetic mean (UPGMA) dendrogram of Nei’s D showed three geographical clusters; the Pacific Ocean, the Sea of Japan and Tanegashima. Two warm currents, the Kuroshio and Tsushima, play an important role in the differentiation of the genetic structure between the Pacific Ocean and the Sea of Japan. M. lamarckii inhabit the surf zone on exposed sandy beaches, and frequent gene flow between localities was predicted. However, the pairwise Fst results revealed genetically significant differences among Japanese M. lamarckii populations; the Tanegashima, Wakimoto (Kagoshima Pref.), Masuda (Shimane Pref.) and Chiribama (Ishikawa Pref.) populations were genetically independent. This is due to the relatively shorter planktonic larval period (5-10 days) of M. lamarckii compared to other bivalves (2-4 weeks). No significant genetic differences were observed among the Okuragahama (Miyazaki Pref.), Katakai (Kujyukurihama), Ooarai (Kashimanada), Akasaki and Nagasuga (Miyagi Pref.) populations. These results suggest that gene flow among the four northern Honshu populations was enabled by the warm Tsugaru current flowing north to south. In contrast, genetic similarities between the Okuragahama (Miyazaki Pref.) and the four northern Honshu populations was due to accumulated seedling releases (from Kashimanada to Okuragahama), and not gene flow caused by ocean currents.
Type Local :雑誌掲載論文
ISSN :0067-8716
Publisher :日本生物地理学会
URI :http://hdl.handle.net/20.500.12000/37566
Citation :日本生物地理学会会報 = Bulletin of the Bio-geographical Society of Japan Vol.69 p.143 -160
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Science)

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