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Population differentiation and speciation in the genus Characidium (Characiformes: Crenuchidae): effects of reproductive and chromosomal barriers
January 17, 2014
12:40 pm
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Matt
Málaga, Spain
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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.

Cake or death?
January 17, 2014
5:18 pm
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plesner
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I'd be very interested in reading this.

January 22, 2014
8:15 pm
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macrostoma
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Me too... very interested.

January 23, 2014
8:55 pm
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Matt
Málaga, Spain
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Me three - no access to this one.

Cake or death?
January 25, 2014
10:52 am
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Matt
Málaga, Spain
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Got it now, will send it over chaps.

Cake or death?
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