Navegando por Autor "França, Leonardo Fernandes"

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Artigo
Population ecology of the freshwater turtle Mesoclemmys vanderhaegei (Testudines: Chelidae)
(Herpetological Conservation and Biology, 2018-07-31) Brito, Elizângela Silva; Vogt, Richard Carl; Valadão, Rafael Martins; França, Leonardo Fernandes; Penha, Jerry Magno Ferreira; Strüssmann, Christine
We sampled Mesoclemmys vanderhaegei in the Upper Paraguay River Basin, in the Cerrado ecosystem of Central Brazil. Populations were sampled between 2010 and 2013, and we used capture-mark-recapture methods to determine the catchability, density, population size structure, and sex ratio of the populations. We sampled two protected areas (Chapada dos Guimarães National Park [CGNP] and Serra das Araras Ecological Station [SAES]) and we captured 300 individuals (77 at CGNP and 223 at SAES) and made 343 recaptures in the two areas. Some individuals were recaptured more than once. We estimated population sizes to be 90 turtles at CGNP and 245 turtles at SAES. Sex ratio was not significantly different from 1:1 at CGNP, whereas at SAES there were more females than males. The population structure varied significantly between the two sampled populations with carapace lengths of turtles at CGNP normally distributed but not at SAES. Although both areas occur within the same ecosystem and are close to each other (180 km straight line distance), the populations possessed distinct demographic characteristics, possibly resulting from local patterns of environmental conditions and biological interactions.
Artigo
Similar regional‑scale survival of tropical and southern temperate birds from the New World
(Oecologia, 2023) França, Leonardo Fernandes; Silva, Clarisse Caroline de Oliveira e; Pinho, João Batista de; Prestes, Nêmora Pauletti; Cueto, Victor R.; Alves, Maria Alice S.; Schunck, Fabio; Fontana, Carla Suertegaray; Lugarini, Camile; Martinez, Jaime; Sagario, M. Cecilia; Casenave, Javier Lopez de; Vecchi, Maurício B.; Repenning, Márcio; Ferreira, Ariane; Dias, Raphael Igor; Passos, Daniel Cunha
The general assumption that the survival patterns of tropical and southern temperate birds are similar lacks empirical data from higher latitudes. Regional comparisons of New World species are rare, and this assumption has been based on data from African studies. Here, we estimate the survival rates of 88 tropical and southern temperate bird populations (69 spe cies) from eight localities in South America to evaluate the hypothesis that the survival of these populations is homogeneous at the regional scale. We estimated survival based on the Cormack-Jolly-Seber model and compared values from diferent environments. The survival estimates ranged from 0.30 to 0.80 (0.56±0.12). Apparent survival did not difer signifcantly between low-latitude tropical environments (03°S) and the other sites from high-latitudes (between 22° and 34°S). Despite a predicted positive trend, body size was not signifcantly related to survival among passerines. On the other hand, phyloge netic relationships explained more than a third of the variation in bird survival. Based on the largest available database on South American bird species, our fndings support the hypothesis that bird survival is homogeneous, at the regional scale, along the southern hemisphere. In particular, we reinforce the hypothesis that climatic variation has a limited infuence on bird survival in the southern hemisphere.