Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/2154
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Type: Artigo de Periódico
Issue Date: 2010
Authors: BASTOS, Heitor Burlamaqui
GONÇALVES, Evonnildo Costa
FERRARI, Stephen Francis
SILVA, Artur Luiz da Costa da
SCHNEIDER, Maria Paula Cruz
Title: Genetic structure of red-handed howler monkey populations in the fragmented landscape of Eastern Brazilian Amazonia
Citation: Bastos, Heitor B. et al. Genetic structure of red-handed howler monkey populations in the fragmented landscape of Eastern Brazilian Amazonia. Genetics and Molecular Biology, São Paulo, v. 33, n. 4, p. 774-780, 2010. Disponível em: <http://www.scielo.br/pdf/gmb/v33n4/27.pdf>. Acesso em: 29 abr. 2011. <http://dx.doi.org/10.1590/S1415-47572010000400027>.
Abstract: We genotyped 15 microsatellite loci in order to evaluate the effects of habitat fragmentation, caused by flooding of the Tucuruí reservoir, on the genetic structure of Alouatta belzebul in eastern Amazonia. The analysis included two populations sampled in 1984, representing both margins of the Tocantins river, and three populations sampled 18 years later. Minimal differences in the diversity levels between present-day (Ho = 0.62-0.69 and AR = 6.07-7.21) and pre-flooding (Ho = 0.60-0.62 and AR = 6.27-6.77) populations indicated there was no significant loss of genetic variability, possibly because of successful management strategies applied during the flooding. The changes observed were limited to shifts in the composition of alleles, which presumably reflect the admixture of subpopulations during flooding. Given this, there were significant differences in the Rst values (p = 0.05) in all but one between-site comparison. Both present-day and original populations showed a deficit of heterozygotes, which suggests that this may be typical of the species, at least at a local level, perhaps because of specific ecological characteristics. The relatively large number of private alleles recorded in all populations may be a consequence of the Wahlund effect resulting from population admixture or a process of expansion rather than the loss of rare alleles through genetic drift. Additionally, the levels of genetic variability observed in this study were higher than those reported for other species of Neotropical primates, suggesting good fitness levels in these A. belzebul populations. Regular genetic monitoring of remnant populations, especially on islands, should nevertheless be an integral component of long-term management strategies.
Keywords: Guariba (Macaco)
Filogenia
Primata
Tucuruí - PA
Rio Tocantins - PA
Pará - Estado
Amazônia Brasileira
ISSN: 1415-4757
Appears in Collections:Artigos Científicos - ICB

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