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Fraxe Neto, H. J. (2009). Demografia de acanthochelys spixii (duméril e bibron, 1835) (testudines, chelidae) no cerrado do distrito federal. Unpublished thesis Dissertação (Mestrado em Biologia Animal), Universidade de Brasília, Brasília. 
Added by: Admin (01 Aug 2010 18:21:54 UTC)
Resource type: Thesis/Dissertation
BibTeX citation key: FraxeNeto2009
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Categories: General
Keywords: Acanthochelys, Acanthochelys spixii, Chelidae, Habitat = habitat, Schildkröten = turtles + tortoises, Südamerika = South America
Creators: Fraxe Neto
Publisher: Universidade de Brasília (Brasília)
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Views index: 17%
Popularity index: 4.25%
Freshwater turtles are under a global survival crisis and, although the development of studies to support conservation strategies is crucial, the species that inhabit the Cerrado biome have not been object of demography investigations. The present study estimates demographic parameters for Acanthochelys spixii, in the Cerrado of Distrito Federal,– using capture-recapture models along 4 years of data collection, and by analyzing the effects of sex, temporal variation and climatic factors on population dynamics. Sex ratio did not vary significantly from 1:1. Under Akaike´s Information Criteria (AIC), selection of candidate models constrained for climatic variables indicated that the interaction between total rainfall and average air temperature from the previous month, as well as the association of recapture probability (p) in a monthly basis, explain the estimates variation, with a constant annual apparent survival (Φ) value of 0.814. Recapture rates along the study period varied from 0.01 to 0.19 and, during the dry season, from 0.01 to 0.04. Monthly average population size was 28 adult turtles, with values between 9 and 31 adults along the 4 years. Annual population growth rates were 0.907 for the 2006-2007 time interval and 0.653 for 2007-2008. Considering the estimated parameters and the anthropic pressure on this protected area, the study evaluates the importance of Parque Nacional de Brasília for herpetofauna´s biodiversity conservation in the Brazilian savanna.
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