Open AccessPopulation differentiation and speciation in the genus C haracidium ( C haraciformes: C renuchidae): effects of reproductive and chromosomal barriers
Author(s) -
Pucci Marcela Baer,
Barbosa Patrícia,
Nogaroto Viviane,
Almeida Mara Cristina,
Artoni Roberto Ferreira,
PansonatoAlves José Carlos,
Foresti Fausto,
MoreiraFilho Orlando,
Vicari Marcelo Ricardo
Publication year - 2014
Publication title -
biological journal of the linnean society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.906
H-Index - 112
eISSN - 1095-8312
pISSN - 0024-4066
DOI - 10.1111/bij.12218
Subject(s) - biology , reproductive isolation , characiformes , gene flow , evolutionary biology , genetic algorithm , ecology , zoology , population , genetics , genetic variation , gene , fishery , demography , sociology , fish <actinopterygii>
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 genus C haracidium was analysed in relation to the geomorphological mechanisms in river courses, events of captured adjacent upland drainages in south‐eastern B razil, and sex chromosome differences. The ZZ / ZW sex chromosomes of C haracidium 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 C haracidium speciation. The W ‐specific probe from C haracidium gomesi generated a highlighted signal on the entire W chromosome of C . gomesi , C haracidium heirmostigmata , C haracidium pterostictum , and C haracidium sp., instead of karyotypes of three C haracidium 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. © 2014 The Linnean Society of London, Biological Journal of the Linnean Society , 2014, 111 , 541–553.