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Chromosome and protein variation in red howler monkeys

Margarida M.C. Lima^I; Maria I.C. Sampaio^I; Maria P.C. Schneider^I; Wolfgang Scheffrahn^II; Horacio Schneider^I; Francisco M. Salzano^III

^IDepartamento de Genética, Universidade Federal do Pará, 66059 Belém, Pará, Brasil
^IIAnthropologisches Institut der Universitãt Zurich-Irchel, Winterthurer Str. 190, CH 8057 Zurich, Switzerland
^IIIDepartamento de Genética, Universidade Federal do Rio Grande do Sul, Caixa Postal 1953, 90001 Porto Alegre, RS, Brasil. Send correspondence to F.M.S.

ABSTRACT

Electrophoretic and karyotypic data were obtained for 16 specimens of Alouatta seniculus collected at the east margin of the Jari River, in Brazilian Amazonia. Diploid numbers of 47, 48 and 49 chromosomes were observed this variation being due to the presence of 1 to 3 supernumeran, microchromosomes. These and other karyotypic characteristics are at variance with results for this same species obtained in Colombia and Bolivia. Genetic variability in A. seniculus was estimated using 26 electrophoretically detectable protein loci. The average heterozygosity was calculated as 9.6%, similar to those observed among other Platyrrhini monkeys. Genetic distances between this species, Alouatta belzebul and Cebus apella paraguayanus yielded values compatible with those expected in intra and intergeneric primate comparisons.

Keywords: Chromosome; Protein variation; Monkeys.

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