アサリの形態変異とその遺伝的特徴
1998 年 57 巻 2 号 p. 121-132
詳細
1998 年 57 巻 2 号 p. 121-132
A Japanese common clam Ruditapes philippinarum population (Awazu population) which shows specialized appearance was morphologically and genetically compared with a normal type (Yashima population). Morphologically, proportions of shell height with shell width and the shell weight index in the Awazu population showed considerably larger than those of the Yashima population, that is, the Awazu population had significantly more globular shell shape. Since fitness for Hardy-Weinberg equilibrium by chi-square tests indicated no significance at any polymorphic loci detected by isozyme analysis in both the populations, they were both regarded as simple Mendelian populations. Values to indicate genetic features in both the populations were all close each other. Although significant differences were recognized in allelic frequencies between the two populations at the GPI^*, LAP^* and PGDH^* loci, the genetic distance (D value) between the two populations resulted in 0.0054, being a figure within inter-local populations reported for this species. The results suggested that the Awazu population is not genetically diverged in particular, the morphological peculiarity of the population might have been caused by environmental factors.
