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Intrageneric Karyotypic Variation in Pseudopaludicola (Anura: Leiuperidae) and Its Taxonomic Relatedness
TLDR
Karyological data for Pseudopaludicola frogs confirm the removal of P. ameghini from synonymy with P. mystacalis and reinforce the need for a taxonomic revision of this genus. Expand
Phylogenetic relationships in Dichroplus Stål (Orthoptera: Acrididae: Melanoplinae) inferred from molecular and morphological data: testing karyotype diversification
TLDR
The mapping of chromosome characters on the combined tree shows that the most extreme karyotype, in D. silveiraguidoi, is a derived condition, probably reached through several centic fusions, and that X‐autosome centric fusions were recurrently fixed during the evolution of the group. Expand
A new index for estimating genetic recombination from chiasma distribution data
TLDR
Index Ir and I′r are proposed for organisms that allow a reasonably accurate measurement of chiasma distribution by proposing an index that takes into account: (a) the proportional length of chromosomes and (b) the accurate position of chiasmata. Expand
Chiasma interference is blind to centromeres1
TLDR
Using large sets of chiasma data from the grasshoppers Leptysma argentina and Chorthippus brunneus and applying statistical approaches that involved either the calculation of coincidence or correlating the distances between the centromere and the nearest chiasmas in either arm, it is concluded that interference acts across the Centromere. Expand
Chromosome Inversion Polymorphisms Influence Morphological Traits in Trimerotropis Pallidipennis (Orthoptera)
TLDR
The hypothesis that reduced body size in a context of reduced minimum temperature may be a response to shortened development season, and so smaller individuals may be advantageous is put forward. Expand
Effects of centric fusions on chiasma frequency and position in Leptysma argentina (Acrididae: Orthoptera) I. Spontaneous and stable polymorphic centric fusions
TLDR
The results suggest that proximal and interstitial chiasma reduction observed in trivalent 3-3/6-6 of L. argentina is due to a later adaptation to the polymorphic condition or a fortuitous genetic condition present in the original mutant, rather than to a direct effect of the fusion itself on chiasMA distribution. Expand
On the origin of B-chromosomes: neo XY systems and X-like supernumeraries in Orthoptera
TLDR
It is pointed out that small Bs could originate from polysomy of the smallest chromosomes, tolerated because of the few genes involved in Cylindrotettix obscurus, and the minute-B category is attributed to residua... Expand
Against the central-marginal model: Three cases in chromosomally polymorphic grasshoppers (Orthoptera: Acrididae)
TLDR
The dangers of over-generalization when discussing chromosomal polymorphisms are emphasised, and it is suggested that such polymorphisms should be considered very much in a case-specific manner in terms of the particular genetic system under study. Expand
Chromosome polymorphisms and natural selection in Leptysma argentina (Orthoptera). II. Gametic phase disequilibrium and differential adult male viability
TLDR
Results signify that strong selective forces act in the adult stage, at least in males, while other components of natural selection remain obscure. Expand
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