INVESTIGADORES
OJEDA Ricardo Alberto
artículos
Título:
CHROMOSOMAL VARIABILITY AND MORPHOLOGICAL NOTES IN Graomys griseoflavus (RODENTIA, CRICETIDAE, SIGMODONTINAE), FROM CATAMARCA AND MENDOZA PROVINCES, ARGENTINA
Autor/es:
LANZONE, C. ; SCHULLCA,N.; D RODRIGUEZ; AGUSTINA A. OJEDA; ALBANESE, M.S.; OJEDA,R.A.
Revista:
MASTOZOOLOGÃA NEOTROPICAL
Editorial:
UNIDAD DE ZOOLOGÍA Y ECOLOGÍA ANIMAL, INSTITUTO ARGENTINO DE INVESTIGACIÓN DE LAS ZONAS ARIDAS, CRICYT, CONICET
Referencias:
Lugar: Mendoza; Año: 2014
ISSN:
0327-9383
Resumen:
Genetic variability in rodents is extremely wide and a fruitful field of research. Graomys griseoflavus
is a phyllotine rodent, endemic to South America, polymorphic for Rb rearrangements. However, few individuals
and populations were studied cytogenetically to date, considering its wide distribution. We present and compare
chromosomal data from Mendoza and Catamarca provinces, contrasting previous hypothesis about its karyotypic
evolution. All populations were polymorphic for Rb rearrangements; in addition, we describe a new fusion
from Mendoza. The presence of more than one heterozygous fusion in several localities refute the hypothesis
proposed for this species that for a new fusion to be generated the others must occur in homozygosis. The
recorded 2n have an irregular geographic distribution. The extra short arms detected are additional factors of
chromosome variability. Some external qualitative characters (i.e., coloration) show certain variability. In some
quantitative external and cranial characters, a low degree of sexual dimorphism was detected. However, there
were not significant differences in external and cranial metrics variables among localities indicating low degree
of differentiation, as reported in previous works; neither the coefficients of variation of these variables had high
values compared to other related species. While a larger sample is needed for these different types of characters,
the high chromosomal variability does not seem to correspond with comparable degrees of morphological and
mitochondrial variability in G. griseoflavus.