论文部分内容阅读
Hybridization with introduced fish species is an important threat to native fish species.We documented a case of hybridization between native barbless carp (Cyprinus pellegrini) and introduced common carp (C.carpio) in Xingyun Lake of Yunnan-Guizhou plateau of China,using a detailed morphological analysis as well as genetic analysis of nine microsatellite loci for a contemporary Xingyun Lake sample and reference samples.Most individuals of the Xingyun Lake sample exhibited intermediate morphology,strongly suggesting extensive hybridization between barless carp and common carp.However,individual admixture coefficients based on microsatellite data exhibited a bimodal distribution in the Xingyun Lake sample,suggesting the existence of two different genetic groups of barbless carp and common carp.The individuals genetically assigned to barbless carp contained a significantly higher proportion of morphologically intermediate individuals than the ones genetically assigned to common carp,suggesting asymmetrical introgression between barbless carp and common carp,mainly towards the former.