LOGIN

RSS Facebook Twitter YouTube
GLOSSARY       

SEARCHGLOSSARY

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

PROFILESEARCH

Population differentiation and speciation in the genus Characidium (Characiformes: Crenuchidae): effects of reproductive and chromosomal barriers

Home Forums Ichthyology Population differentiation and speciation in the genus Characidium (Characiformes: Crenuchidae): effects of reproductive and chromosomal barriers

This topic contains 0 replies, has 1 voice, and was last updated by  Matt 5 years, 7 months ago.

Viewing 5 posts - 1 through 5 (of 5 total)
  • Author
    Posts
  • #303117

    Matt
    Keymaster

    Biological Journal of the Linnaean Society – early view

    Abstract

    Both time and low gene flow are the key factors by which different biological species arise. The divergence process among lineages and the development of pre- or postzygotic isolation occur when gene flow events are lacking. The separation among species of the genusCharacidium was analysed in relation to the geomorphological mechanisms in river courses, events of captured adjacent upland drainages in south-eastern Brazil, and sex chromosome differences. The ZZ/ZW sex chromosomes of Characidium vary in size, morphology, degree of heterochromatinization, and presence/absence of ribosomal DNA. The goal of this study was to understand the mechanism of sex chromosome differentiation, its close association with the geological history of cladogenetic events among drainages, and reproductive isolation leading to Characidium speciation. The W-specific probe from Characidium gomesi generated a highlighted signal on the entire W chromosome of C. gomesiCharacidium heirmostigmataCharacidium pterostictum, and Characidium sp., instead of karyotypes of three Characidium aff. zebra populations, which showed scattered signals. An evolutionary and biogeographic landscape arose by analysis of ribosomal DNA site location and differentiation of the sex chromosomes, which established mechanisms of reproductive isolation leading to meiotic barriers, keeping the biological unit distinct even if the contact among species was restored.

    #352604

    plesner
    Participant

    I’d be very interested in reading this.

    #352627

    macrostoma
    Participant

    Me too… very interested.

    #352626

    Matt
    Keymaster

    Me three – no access to this one.

    #352652

    Matt
    Keymaster

    Got it now, will send it over chaps.

Viewing 5 posts - 1 through 5 (of 5 total)

You must be logged in to reply to this topic.