The central-marginal hypothesis in acridid Orthoptera: A critique of Colombo's (2012) article

Bidau, Claudio J.; Martí, Dardo A.

doi:10.14411/eje.2013.028

Eur. J. Entomol.

2013

DOI: 10.14411/eje.2013.028

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The central-marginal hypothesis in acridid Orthoptera: A critique of Colombo's (2012) article

Claudio J. Bidau¹,

Dardo A. Martí²

Abstract: We discuss and criticise the contention of Colombo (2012) that the central-marginal model does not apply to three species of chromosomally polymorphic acridid grasshoppers, and that chromosomal clines in these species are a consequence of temperature gradients. We also discuss Colombo's interpretation of our own results on the South American melanopline grasshopper, Dichroplus pratensis Bruner.

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Chromosome fusion polymorphisms in the grasshopper, Dichroplus fuscus (Orthoptera: Acrididae: Melanoplinae): Insights on meiotic effects

Taffarel¹,

Bidau²,

Martí³

2015

Eur. J. Entomol.

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Robertsonian fusions account for many of the changes in the evolution of the orthopteran karyotype; in their origin, a centric fusion is involved between two acro-telocentric chromosomes, forming a single bi-armed chromosome. It is usual for these rearrangements to be associated with profound changes in meiosis, such as modification in frequency and distribution of chiasmata. Dichroplus fuscus is a South American grasshopper with a wide distribution. In this work we analyzed nine populations from Misiones Province, northeastern Argentina. This species presents a standard karyotype of 2n = 23/24 (♂/♀) with all chromosomes acro-telocentric and an X0/XX chromosomal sex determining mechanism. This standard karyotype has been modified by the occurrence of two Robertsonian fusions involving chromosomes 1/3 and 2/4; values of fusions per individual (fpi) show a significant increase in the presence of karyotypic polymorphisms towards southern populations. In individuals showing chromosomal rearrangements, we observed a clear redistribution of chiasmata towards distal positions; significant differences were noted between Robertsonian homozygotes (Ho) and heterozygotes (Ht) for chromosomes arms L 1 and M 3 , although this was not the case between Ho and Ht for chromosome arms L 2 and M 4. With regard to the orientation of trivalents, values obtained for non-convergent orientation were low.

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Chromosome fusion polymorphisms in the grasshopper, Dichroplus fuscus (Orthoptera: Acrididae: Melanoplinae): Insights on meiotic effects

Taffarel¹,

Bidau²,

Martí³

2015

Eur. J. Entomol.

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The central-marginal hypothesis in acridid Orthoptera: A critique of Colombo's (2012) article

Cited by 1 publication

References 57 publications

Chromosome fusion polymorphisms in the grasshopper, Dichroplus fuscus (Orthoptera: Acrididae: Melanoplinae): Insights on meiotic effects

Chromosome fusion polymorphisms in the grasshopper, Dichroplus fuscus (Orthoptera: Acrididae: Melanoplinae): Insights on meiotic effects

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