Protein electrophoretic variability in Saimiri and the question of its species status

Authors

  • Barbara T. F. Silva,

    1. Departamento de Genética, Centro de Ciěncias Biológicas, Universidade Federal do Pará, Campus Universitário do Guamá, Belém, PA, Brazil
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  • Maria I. C. Sampaio,

    1. Departamento de Genética, Centro de Ciěncias Biológicas, Universidade Federal do Pará, Campus Universitário do Guamá, Belém, PA, Brazil
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  • Horacio Schneider,

    1. Departamento de Genética, Centro de Ciěncias Biológicas, Universidade Federal do Pará, Campus Universitário do Guamá, Belém, PA, Brazil
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  • Maria P. C. Schneider,

    1. Departamento de Genética, Centro de Ciěncias Biológicas, Universidade Federal do Pará, Campus Universitário do Guamá, Belém, PA, Brazil
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  • Enrique Montoya,

    1. Proyecto Peruano de Primatologia, Instituto Veterinário de Investigaciones Tropicales y de Altura, Iquitos, Peru
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  • Filomeno Encarnación,

    1. Proyecto Peruano de Primatologia, Instituto Veterinário de Investigaciones Tropicales y de Altura, Iquitos, Peru
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  • Sidia M. Callegari-Jacques,

    1. Departamento de Genética, Instituto de Biociěncias, Porto Alegre, RS, Brazil
    2. Departamento de Estatística, Instituto de Matemática, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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  • Francisco M. Salzano

    Corresponding author
    1. Departamento de Genética, Instituto de Biociěncias, Porto Alegre, RS, Brazil
    • Departamento de Genética, Instituto de Biociěncias, UFRGS, Caixa Postal 15053, 91501–970 Porto Alegre, RS, Brazil
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Abstract

An electrophoretic survey of 15 protein systems (22 loci) was employed to determine the genetic relationships among 9 populations (441 individuals) of South American squirrel monkeys (Saimiri sciureus sciureus, S. sciureus boliviensis, and S. sciureus ustus). Genetic markers capable of differentiating the second from the two other taxa were observed mainly in the ADA and GPI systems. Heterogeneity for ADA and CA2 between populations from opposite banks of the Jamari river was verified in S. sciureus ustus. The average heterozygosities ranged from 3% to 5%, the lowest being in S. sciureus sciureus and the highest in S. sciureus boliviensis. Low genetic distances (D = 0.001−0.057) were observed between populations within taxa or between S. sciureus sciureus and S. sciureus ustus. But both differed to a larger extent from S. sciureus boliviensis (D = 0.11 in both comparisons). There is a positive correlation between the genetic and geographic distance matrices. The three taxa are more clearly separated (D = 0.76–0.77) from the outgroup used for comparison (Cebus apella). Our data suggest that there is only one large, polytypic species of squirrel monkeys in South America, S. sciureus, forming a contiguous ring of geographical races or subspecies. Two of the most differentiated forms meet at the Peruvian Amazonia where natural hybrids and secondary intergradation have been reported. © 1993 Wiley-Liss, Inc.

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