Chromosomal homology in southern Akodon |
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| Authors: | M H Gallardo |
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| Institution: | (1) Instituto de Ecologia y Evolucion, Universidad Austral de Chile, Casilla 567, Valdivia, Chile;(2) Present address: Department of Biology, New Mexico State University, Box 3AF, 88003 Las Cruces, New Mexico, USA |
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| Abstract: | Summary Differential staining (G and C) of southern South AmericanAkodon are presented.A. olivaceus, A. longipilis andA. sanborni all have the same karyotype (2n=52, NF=58). A virtually identical band sequence is observed. This situation is interpreted using the canalization model of chromosomal evolution which stresses an optimum karyotype for each adaptive zone. Despite the high degree of conservation of the chromosome structures, the specific status of these species is supported by maintenance of distinctness when they occur in areas of sympatry.The research was partially supported by Proyecto de Investigación I-78-86, Dirección de Investigación, Universidad Austral de Chile and Programa Especial de Citogenética, U. de Chile sede Norte, Santiago, Chile. |
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