Genetic differentiation of the southern population of the fathead minnow Pimephales promelas Rafinesque (Actinopterygii: Cyprinidae)

摘要: The North American cyprinid Pimephales promelas is a species with wide distribution range, occurring in distinct hydrographic basins Mexico, Canada, and the United States. Previous morphological meristic analyses of P. concluded that at least three subspecies exist midwestern northeast region No studies have been carried out on Mexican population promelas, but findings cryptic diversity States populations this species, as well other codistributed fish Mexico could be an indication consist species. Using mitochondrial gene cyt b first intron S7 ribosomal protein-coding nuclear we phylogenetic phylogeographic across its range northwestern Mexico. information were analyzed structure differentiation level between from river identifying diversity. Twenty-four sequences obtained for b, 30 S7, which included two heterozygous alleles. results revealed existence four well-differentiated lineages: (1) Yaqui Pacific slope; (2) Santa Maria, (3) Casas Grandes Guzman Basin; (4) Nazas+Conchos Chihuahua state. This challenges current taxonomy promelas. Differences relationships markers small sample size Maria (n = 1), indicate our must corroborated more data analyses. Biogeographic analysis these suggest evolutionary history P. promelas associated fragmentation ancestral Rio Grande system since Miocene consistent