Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae)

Previous studies of Ctenomys species from Central and Western Argentina, referred to as the mendocinus-group, which included a single C. azarae specimen, showed that they share a similar karyotype of 2n = 47-48, a complex chromosomal polymorphism and heterochromatic short arms in most of biarmed aut...

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Autores principales:	Massarini, A.I., Dyzenchauz, F.J., Tiranti, S.I.
Formato:	JOUR
Materias:	argentina article autosome chromosome polymorphism geographic distribution heterochromatin karyotype natural population species Ctenomys azarae Ctenomys mendocinus
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00180661_v128_n3_p207_Massarini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_00180661_v128_n3_p207_Massarini2023-10-03T14:15:14Z Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae) Massarini, A.I. Dyzenchauz, F.J. Tiranti, S.I. argentina article autosome chromosome polymorphism geographic distribution heterochromatin karyotype natural population species Ctenomys azarae Ctenomys mendocinus Previous studies of Ctenomys species from Central and Western Argentina, referred to as the mendocinus-group, which included a single C. azarae specimen, showed that they share a similar karyotype of 2n = 47-48, a complex chromosomal polymorphism and heterochromatic short arms in most of biarmed autosomes. In this study karyotypes of 46 specimens of C. azarae from nine local populations from La Pampa and Cordoba Provinces (Argentina) were analyzed. Diploid numbers ranged from 2n = 46 to 2n = 48 and the G-banding pattern was identical to the other species of the mendocinus-group. As in C. mendocinus and C. porteousi, heterochromatin was highly variable, exhibiting a large number of polymorphisms that involved C-positive blocks. Our data also revealed that the same polymorphism displayed in pair A1, was present in five C. azarae populations. Another significant finding was the presence of the homomozygous karyotype (2n = 46), which was absent in 106 previously studied specimens of C. porteousi and C. mendocinus, in two C. azarae populations. Cytogenetic, morphometric, and sperm morphology studies of the mendocinus-group suggest recent allopatric speciation events, in which chromosomal rearrangements did not play a central role. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00180661_v128_n3_p207_Massarini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	argentina article autosome chromosome polymorphism geographic distribution heterochromatin karyotype natural population species Ctenomys azarae Ctenomys mendocinus
spellingShingle	argentina article autosome chromosome polymorphism geographic distribution heterochromatin karyotype natural population species Ctenomys azarae Ctenomys mendocinus Massarini, A.I. Dyzenchauz, F.J. Tiranti, S.I. Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae)
topic_facet	argentina article autosome chromosome polymorphism geographic distribution heterochromatin karyotype natural population species Ctenomys azarae Ctenomys mendocinus
description	Previous studies of Ctenomys species from Central and Western Argentina, referred to as the mendocinus-group, which included a single C. azarae specimen, showed that they share a similar karyotype of 2n = 47-48, a complex chromosomal polymorphism and heterochromatic short arms in most of biarmed autosomes. In this study karyotypes of 46 specimens of C. azarae from nine local populations from La Pampa and Cordoba Provinces (Argentina) were analyzed. Diploid numbers ranged from 2n = 46 to 2n = 48 and the G-banding pattern was identical to the other species of the mendocinus-group. As in C. mendocinus and C. porteousi, heterochromatin was highly variable, exhibiting a large number of polymorphisms that involved C-positive blocks. Our data also revealed that the same polymorphism displayed in pair A1, was present in five C. azarae populations. Another significant finding was the presence of the homomozygous karyotype (2n = 46), which was absent in 106 previously studied specimens of C. porteousi and C. mendocinus, in two C. azarae populations. Cytogenetic, morphometric, and sperm morphology studies of the mendocinus-group suggest recent allopatric speciation events, in which chromosomal rearrangements did not play a central role.
format	JOUR
author	Massarini, A.I. Dyzenchauz, F.J. Tiranti, S.I.
author_facet	Massarini, A.I. Dyzenchauz, F.J. Tiranti, S.I.
author_sort	Massarini, A.I.
title	Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae)
title_short	Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae)
title_full	Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae)
title_fullStr	Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae)
title_full_unstemmed	Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae)
title_sort	geographic variation of chromosomal polymorphism in nine populations of ctenomys azarae, tuco-tucos of the ctenomys mendocinus group (rodentia: octodontidae)
url	http://hdl.handle.net/20.500.12110/paper_00180661_v128_n3_p207_Massarini
work_keys_str_mv	AT massariniai geographicvariationofchromosomalpolymorphisminninepopulationsofctenomysazaraetucotucosofthectenomysmendocinusgrouprodentiaoctodontidae AT dyzenchauzfj geographicvariationofchromosomalpolymorphisminninepopulationsofctenomysazaraetucotucosofthectenomysmendocinusgrouprodentiaoctodontidae AT tirantisi geographicvariationofchromosomalpolymorphisminninepopulationsofctenomysazaraetucotucosofthectenomysmendocinusgrouprodentiaoctodontidae
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Geographic variation of chromosomal polymorphism in nine populations of Ctenomys azarae, Tuco-tucos of the Ctenomys mendocinus group (Rodentia: Octodontidae)

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