ウグイ地域集団間の遺伝的距離
| Autor: | Matsuoka, Norimasa, Yanagino, Yoshiyuki |
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| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | 弘前大学農学生命科学部学術報告. (9):1-7 |
| ISSN: | 1344-8897 |
| Popis: | Tribolodon hakonensis is one of common cyprinid fish species in Japan and widely distributed in eastern Asian Continent. The local populations of the species in Japan show remarkable variation in morphological and ecological characters. In particular, population from Lake Biwa in Shiga Pref. in middle part of Japan is characteristic at morphological viewpoint: The population has the projecting lower jaw and slender body which are not observed in other local popultions. We examined the extent of genetic differentiation between two local populations of T. hakonensis from Lake Biwa and the river in Aomori Pref. of northern Japan by allozyme analysis. The out group was Phoxinus lagowskii steindachneri of the same family Cyprinidae. Twelve genetic loci were detected by electrophoresis of eight different enzymes. From allele frequencies data in 12 genetic loci scored, genetic identity（I） and genetic distance（D）were calculated by the method of Nei（1972）. The allozyme study indicated the followings:（1）The genetic identity（I=0.985）between two local populations was much high value and comparable to I values between conspecific local populations in many other animals, but was not equivalent with the I values observed between sibling species or very closely related species.（2）The statistically significant differences of allele frequencies between two populations were not found in any loci.（3）The diagnostic loci which show the difference of allele composition were not observed.（4）The I value between T. hakonensis and P. lagowskii steindachneri was I=0.518 and equivalent with those between congeners in many other animals. These allozyme results demonstrated that two populations of T. hakonensis are little genetically differentiated, and that two cyprinid fish, T. hakonensis and P. lagowskii steindachneri might be classified as congeners at molecular level. The present study also suggested that fish might have faster evolutionary rate than other animals at morphological level, though the molecular evolutionary rate is constant. 弘前大学農学生命科学部学術報告. 9, 2006, p.1-7 |
| Databáze: | OpenAIRE |
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