Analysis of factors crucial to the invasion success of an alien sunfish, Lepomis macrochirus, in Japan by evolutionary approaches

为了阐明遗传因素对日本蓝鳃太阳鱼入侵成功的关键作用，进行了形态和遗传分析，以及饲养实验中的Qst-Fst分析。种群分析表明，日本许多种群的入侵成功主要是由于其在琵琶湖的创始种群的高遗传多样性。Qst-Fst分析表明，种群间适应性性状的差异是由自然选择引起的，而不是遗传漂变。维持适应性性状的高遗传多样性被认为是蓝鳃金龟在日本成功入侵的重要因素。

To elucidate the role of genetic factors crucial to the invasion success of bluegill sunfish in Japan, morphological and genetic analyses were performed, together with Qst-Fst analysis in rearing experiments. Population analysis suggested that invasion success in many populations of Japan was mainly due to high genetic diversity of their founder population in Lake Biwa. Qst-Fst analysis revealed that difference in adaptive characters among populations was caused by natural selection, rather than genetic drift. Sustenance of high genetic diversity in adaptive characters was considered to be important in the invasion success of bluegill in Japan.