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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第62巻 第2号 >

函館市近郊に生息するニホンザリガニにおける繁殖形質の個体群間比較

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Title: 函館市近郊に生息するニホンザリガニにおける繁殖形質の個体群間比較
Other Titles: Comparison of reproductive traits among local populations of the freshwater crayfish Cambaroides japonicus near Hakodate
Authors: 阿部, 峻太1 Browse this author
田代, 慧2 Browse this author
竹下, 文雄3 Browse this author
和田, 哲4 Browse this author →KAKEN DB
Authors(alt): Abe, Shunta1
Tashiro, Satoshi2
Takeshita, Fumio3
Wada, Satoshi4
Keywords: Japanese crayfish
Cambaroides japonicus
Egg size
Clutch size
Conservation ecology
Reproduction
Issue Date: 8-Aug-2012
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Journal Title(alt): Bulletin of Fisheries Sciences, Hokkaido University
Volume: 62
Issue: 2
Start Page: 29
End Page: 41
Abstract: Cambaroides japonicusis a freshwater crayfish endemic to Japan that occurs in northern Tohoku and Hokkaido. Its populations are known to be decreasing in site, but there have been few studies describing its lifehistory, especially in southern Hokkaido. In the present study, life history characters of C. japonicus in southern Hokkaido are described and compared among local populations. Contrasting differences were found in body size of males, females and youngsat sites named A, B, and Ca-Cd. Males were larger at sites Ca, Cb, and Cd than at sites A and B, and females were larger at sites Ca and Cb than at sites A, but juveniles were smaller at sites Ca, Cb, Cd than at sites A and B.Clutch size was smaller at site B than at site C, and egg size was larger at site B than at sites A and C. The spawning season and length of breeding period both appeared to differ among research sites.This study demonstrates that the life history of C. japonicus differs among populations. The local populationsare known to vary genetically, so the phenotypic variations in life history characters may be caused by genetic differences.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/49836
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第62巻 第2号

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