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dc.contributor.author
Bidau, Claudio Juan
dc.contributor.author
Marti, Dardo Andrea
dc.date.available
2018-06-05T20:32:40Z
dc.date.issued
2005-03
dc.identifier.citation
Bidau, Claudio Juan; Marti, Dardo Andrea; Variability along a latitudinal gradient in the chiasma frequency and morphological characters of Dichroplus pratensis (Orthoptera: Acrididae); Czech Academy of Science; European Journal of Entomology (Ceske Budejovice); 102; 1; 3-2005; 1-12
dc.identifier.issn
1210-5759
dc.identifier.uri
http://hdl.handle.net/11336/47395
dc.description.abstract
The grasshopper Dichroplus pratensis Bruner is polymorphic and polytypic for a complex Robertsonian system. In this species, centric fusions induce changes in number and position of chiasmata, and thus potentially affect intrachromosomal genetic recombination and genetic variability. Males and females, from 23 populations covering most of the geographic range of the species and spanning 22 degrees of latitude, were studied. We analyzed chiasma frequency in relation to variability in six exomorphological characters. The chromosomal polymorphisms of D. pratensis are widely geographically distributed, and show a central-marginal pattern, in which the central populations (those occupying the ecologically optimal habitats) have high mean frequencies of different fusions per individual (F) of up to F = 3.00 and total chiasma frequencies as low as XT = 8.98 per cell, while those near the margins of the distribution (central Patagonia and the Andes) have very low levels of chromosomal polymorphisms [down to F = 0.00 in most geographically marginal locations), monomorphic karyotypes and high chiasma frequencies (XT = 11.66, in the southernmost (Rada Tilly, 45°57´S) and XT = 12.01 in the northernmost population (Volcán, 23°55´S)]. Increasing chiasma frequencies towards the margins of the range are positively and significantly correlated with increasing levels of morphological variability. The decrease in fusion polymorphism and the consequent increase in genetic recombination (both inter- and intrachromosomal) in the marginal areas, is a result of natural selection favouring higher levels of variability, which could be adaptive in ecologically harsher and changing environments
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Czech Academy of Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Central-Marginal Distribution
dc.subject
Chiasmata
dc.subject
Dichroplus
dc.subject
Latitudinal Gradient
dc.subject
Morphological Variability
dc.subject
Recombination
dc.subject
Robertsonian Translocation
dc.subject.classification
Zoología, Ornitología, Entomología, Etología
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Variability along a latitudinal gradient in the chiasma frequency and morphological characters of Dichroplus pratensis (Orthoptera: Acrididae)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-05-21T16:56:43Z
dc.identifier.eissn
1802-8829
dc.journal.volume
102
dc.journal.number
1
dc.journal.pagination
1-12
dc.journal.pais
República Checa
dc.journal.ciudad
Ceske Budejovice
dc.description.fil
Fil: Bidau, Claudio Juan. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Misiones; Argentina. Universidade Do Estado de Rio Do Janeiro; Brasil
dc.description.fil
Fil: Marti, Dardo Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Misiones; Argentina
dc.journal.title
European Journal of Entomology (Ceske Budejovice)
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.14411/eje.2005.001
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.eje.cz/artkey/eje-200501-0001_variability_along_a_latitudinal_gradient_in_the_chiasma_frequency_and_morphological_characters_of_dichroplus_pr.php
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