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| DA ROSA,RENATA; RUBERT,MARCELÉIA; BERTOLLO,LUIZ A C; MARTINS-SANTOS,ISABEL C; GIULIANO-CAETANO,LUCIA. |
| Karyotypes of seventeen Hoplias malabaricus specimens, collected in the fish culture station of UNOPAR (University of Northern Paraná), were analyzed. The station is in the Claro River system in the Tibagi River basin. Two distinct and coexistent karyotype forms (cytotypes) were identified, comprising either 42 chromosomes (cytotype A) or 40 chromosomes (cytotype C), both presenting metacentric and submetacentric chromosomes. In two specimens, one male and one female, it was not possible to characterize a modal diploid number because different cell lines were observed, with a predominance of 2n=41 and 2n=42 chromosomes at a frequency of 38.24% and 41.12%, respectively. The karyotype with 2n=41 showed some putative monosomic and trisomic chromosomes, while... |
| Tipo: Journal article |
Palavras-chave: Hoplias malabaricus; Chromosomal mosaicism; Coexistence of cytotypes; RAPD; Reproductive isolation. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300003 |
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| Costa,Fernando G.; De Oca,Laura Montes; Perdomo,Cintya; Ortiz-Villatoro,David; Baruffaldi,Luciana; Pérez-Miles,Fernando. |
| When two similar species co-occur in time and space, strong mechanisms isolating them from each other are expected. Acanthoscurria suina Pocock, 1903 and Eupalaestrus weijenberghi (Thorell, 1894) are two sympatric and synchronic tarantulas that inhabit burrows in Uruguay's meadows. Here we test how and when reproductive isolation operates between these species. We exposed females of each species simultaneously to two males: either one male of each species, or two males of the same species. Males courted females of both species. Contrary to expectations, however, females of A. suina responded more effusively to heterospecific than to conspecific males, whereas females of E. weijenberghi only responded to conspecific males. Clasping (prelude of mating) was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Courtship; Neotropical tarantulas; Reproductive isolation; Sex pheromone; Sexual selection. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000500011 |
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| Lemaire, Christophe; Versini, J; Bonhomme, Francois. |
| To investigate the origin and maintenance of the genetic discontinuity between Atlantic and Mediterranean populations of the common sea bass (Dicentrarchus labrax) we analysed the genetic variation at a fragment of mitochondrial cytochrome b sequence for 18 population samples. The result were also compared with new or previously published microsatellite data. Seven mitochondrial haplotypes and an average nucleotidic divergence of 0.02 between Atlantic and Mediterranean populations that matches a Pleistocene allopatric isolation were found. The frequency variation at the cytochrome b locus was many times greater between Atlantic and Mediterranean populations ((θ) over cap (C) = 0.67) than at microsatellite loci ((θ) over cap (N) = 0.02).... |
| Tipo: Text |
Palavras-chave: Reproductive isolation; Phylogeography; MtDNA; Microsatellites; Genetic transitions. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-776.pdf |
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