东海常见鲳属鱼类的形态差异及系统进化关系探讨

应用多变量形态度量学方法研究了鲳属中常见鱼类银鲳、翎鲳和中国鲳的形态差异,同时对3种鲳鱼线粒体DNA 16S rRNA基因序列差异进行了分析,并根据3种鲳鱼的形态和分子数据对其系统进化关系进行了探讨.聚类分析表明,银鲳和翎鲳形态较为相似,而与中国鲳形态差异较大.判别分析表明,3种鲳鱼形态上存在着明显差异,利用4个形态参...

Morphological variation and phylogenetic relationship among three common Pampus fishes in East China Sea

Morphological variations among Pampus argenteus,P.punctatissimus and P.chinensis were studied by using multivariate morphemetrics.And the mtDNA 16S rRNA sequences of three Pampus fishes were analyzed.The phylogenic relationship between three kinds of pomfret based on morphological and molecular data was discussed.Cluster analysis showed that from the morphological point of view,P.argenteus was very similar to P.punctatissimus,but not similar to P.chinensis.There were significant morphological differences among three Pampus fishes based on the results of stepwise discriminant analyais.The three Pampus fishes can be differentiated accurately using 4 morphological parameters,and the discrimant accuracy was 100%.Discriminant formula for three Pampus fishes was also established using these 4 morphological parameters.Canonical variate analysis also showed that there was obvious morphological differentiation among three Pampus fishes,and the mutation part focused on head and caudal part.Different life history and habitat environment may be responsible for the differentiation among three Pampus fishes.There were 40 variable sites and 2 insertion and deletion sites in all 491 aligned base pairs of mtDNA 16S rRNA sequences.5 haplotypes were found in 26 individuals of three Pampus fishes.The NJ molecular phylogenetic tree based on haplotypes indicated a closer relationship between P.punctatissimus and P.chinensis and a farther relationship between P.argenteus and the other two species.The morphological similarity inferred from multivariate morphormetrics can not fully reflect the phylogenetic relationship among P.argenteus,P.punctatissimus and P.chinensis.