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Allozyme genetic distances and variability were studied by horizontal starch gel electrophoresis in 6 species of marsupials from North and South America representing 4 different genera. Twenty-one presumptive loci were assessed in a total of 151 specimens. Only 1 of 21 loci was found to be monomorphic in the whole sample. Phenetic and cladistic interspecific analysis coincided in rendering two sharply differentiated subgroups: one comprising species of the genus Didelphis Linnaeus, 1758 (D. marsupialis Linnaeus, 1758, D. virginiana Kerr, 1792 and D. albiventris Lund, 1840), and the other comprising Monodelphis dimidiata (Wagner, 1847), Lestodelphys halli (Thomas, 1921) and Lutreolina crassicaudata (Desmarest, 1804). No relationships between the bradytelic condition, the karyotype stability of this group, and genetic variability were found. On the other hand, the existence of species with brief life span such as Lestodelphys halli and Monodelphis dimidiata (Marmosini tribe) and species with long life span (Didelphini tribe) allowed us to test the hypothesis which correlates generation-time with genetic variability. We conclude that a general explanation for genetic variability must involve more than just generation-time.


Documento: Artículo
Título:Allozyme genetic distances and evolutionary relationships in marsupials of North and South America
Autor:Barrantes, G.E.; Daleffe, L.
Filiación:Depto. de Ciencias Biológicas, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, Nuñez, 1428 Buenos Aires, Argentina
Instituto de Neurociencia, Depto. de Ciencias Biológicas, Ciudad Universitaria, Nuñez, 1428 Buenos Aires, Argentina
Departamento de Bíologia, Ciclo Básico Común, Ciudad Universitaria, Nuñez, 1428 Buenos Aires, Argentina
Palabras clave:Allozymes; Marsupials; Systematic relationships; allozyme; evolutionary biology; genetic variation; marsupial; North America; South America; Didelphis albiventris; Didelphis albiventris; Didelphis marsupialis; Didelphis marsupialis; Didelphis virginiana; Didelphis virginiana; Lestodelphys halli; Lestodelphys halli; Lutreolina crassicaudata; Lutreolina crassicaudata; Metatheria; Monodelphis dimidiata; Monodelphis dimidiata
Página de inicio:233
Página de fin:242
Título revista:Acta Theriologica
Título revista abreviado:Acta Theriol.


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---------- APA ----------
Barrantes, G.E. & Daleffe, L. (1999) . Allozyme genetic distances and evolutionary relationships in marsupials of North and South America. Acta Theriologica, 44(3), 233-242.
---------- CHICAGO ----------
Barrantes, G.E., Daleffe, L. "Allozyme genetic distances and evolutionary relationships in marsupials of North and South America" . Acta Theriologica 44, no. 3 (1999) : 233-242.
---------- MLA ----------
Barrantes, G.E., Daleffe, L. "Allozyme genetic distances and evolutionary relationships in marsupials of North and South America" . Acta Theriologica, vol. 44, no. 3, 1999, pp. 233-242.
---------- VANCOUVER ----------
Barrantes, G.E., Daleffe, L. Allozyme genetic distances and evolutionary relationships in marsupials of North and South America. Acta Theriol. 1999;44(3):233-242.