Cytogenetic studies in three pimelodella meeki populations (Pisces, pimelodidae) from Tibagi River basin (Brazil)

Article Abstract:

The objective of the study was to characterize cytogenetically different populations of Pimelodella meeki from the Tibagi River basin, Parana, Brazil, and to analyze the nucleolus organizer regions by means of the AgNO3, CMA3, and situ hybridization (FISH) with 18S rDNA probe. This work makes clear the necessity for more deeply systematic studies, because of the confused taxonomic situation of the genus Pimelodella.

Brazil, Environmental aspects, Cytogenetics, Watersheds

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Independent origins or allotriploidy in the fish genus Poeciliopsis

Article Abstract:

An evaluation of mitochondrial DNA (mtDNA) sequences and allozymes to assess possible modes of origin, clonal diversity and evolutionary age in a triploid all-female fish of the genus Poeciliopsis from Sinaloa, Mexico is presented. Results demonstrate two independent origins of allotriploidy in Poeciliopsis, but are still consistent with the hypothesis that allotriploidy origins in Poeciliopsis are extremely rare.

Mexico, Mitochondrial DNA

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