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• W4244069404 abstract "Muriquis (Brachyteles arachnoids) are endemic to the Atlantic Forest of southeastern Brazil, where an estimated 1200 individuals are distributed unevenly among only 19 populations. Despite the fact that over two–thirds of all muriquis live at low densities in large and protected, undisturbed forests, virtually nothing is known about the demography of these populations. Consideration of the mechanisms underlying the low extinction probabilities simulated for muriquis inhabiting the small, disturbed forest at the EstaÇão Biologica de Caratinga (EEC), Minas Gerais, where long–term demographic and behavioral studies have been conducted, provides disturbing predictions about the viability of other populations living at lower densities. Local resource competition may be responsible for the female–biased infant sex ratio documented at the EBC under the female–biased dispersal regime exhibited by muriquis. At lower population densities, however, release from competition may lead to male–biased infant sex ratios, and correspondingly slower population growth rates. High densities at the EBC also result in frequent intergroup encounters, permitting muriquis there to avoid close inbreeding through extra-group copulations; but at low densities, opportunities to avoid inbreeding may be more limited. Finally, habitat heterogeneity at the EBC, particularly the greater dietary diversity supported by secondary and regenerating vegetation in disturbed forests, not only may support higher muriqui densities but also provide greater dietary buffers against catastrophic fruit scarcities compared to undisturbed forests. Comparative demographic data on muriqui populations inhabiting undisturbed forests are critically needed to evaluate these predictions and to develop informed management plans for this endangered primate. Muriquis (Brachyteles arachnoides) são primatas endêmicos da floresta atlãntica do sudeste do Brasil, onde um número estimado de 1200 indivíduos esta distribuído de forma desigual entre apenas 19 popula¸ões. Apesar de mais de dois ter¸os de todos os muriquis viverem em baixas densidades em grandes áres protegidas de florestas não perturbadas, virtualmente nada é conhecido a respeito da demografia dessas popula¸ões. Estudos demográficos e comportamentais a longo prazo têrn sido conduzidos em pequenos fragmentos de floresta perturbada na Esta¸ão Biológica de Caratinga (EEC), Minas Gerais, onde muriquis ocorrem em alias densidades. Os estudos conduzem a algumas considera¸ões sobre os mecanismos subjacentes às baixas probabilidades de extin¸ão simuladas para muriquis habitando estes habitats e oferecem predi¸ões perturbadoras sobre a viabilidade das popula¸ões de muriquis que vivem em baixas densidades. A competi¸ão por recursos locais pode ser responsável por uma razão sexual dos infanres desviada para o sexo feminino documentada para a EEC, onde a popula¸ão adulta de muriquis exibe uma razão sexual também desviada para as fêmeas. Entretando, em baixas densidades, a libera¸ão da competi¸ão pode levar a uma razão sexual dos infantes desviada para o sexo masculino e, conseqüentemente, uma taxa de crescimento populacional lenta. A alta densidade populacional na EBC também resulta em uma maior frequência de encontros entre-grupos, permitindo que os muriquis evitem endogamia através de cópulas extra-grupo; por outro lado, em baixas densidades as oportunidades de evitar a endogamia podem ser mais limitadas. Finalmente, a heterogeneidade ambiental na EBC, particularmente a grande diversidade de dieta suportada pela vegeta¸ão secondária e em regenera¸ão das florestas perturbadas, pode não só sustenrar densidades mais altas de muriquis como servir como tampóes alimentares contra a escassez catastrófica de frutos, se comparada com florestas não perturbadas. Dados demográficos comparatives entre popula¸ães de muriquis vivendo em florestas não perturbadas são necessáries com urgência para avaliar estas predi¸ães e para o desenvol-vimento de pianos de manejo adequados para este primata amea¸ado." @default.
• W4244069404 created "2022-05-12" @default.
• W4244069404 creator A5004365071 @default.
• W4244069404 date "2000-12-01" @default.
• W4244069404 modified "2023-09-27" @default.
• W4244069404 title "Population Viabilities and Conservation Implications for Muriquis (Brachyteles arachnoids) in Brazil's Atlantic Forest1" @default.
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• W4244069404 doi "https://doi.org/10.1111/j.1744-7429.2000.tb00628.x" @default.
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