Influência da fragmentação na ocorrência de três primatas neotropicais ameaçados de extinção no Nordeste do Brasil
The species of Brazilian primates Callicebus barbarabrownae, Callicebus coimbrai and Sapajus xanthosternos are at risk of extinction. One of the causes of this scenario is the fragmentation of the areas of occurrence of these species in the Caatinga and Mata Atlântica. In this context, the presen...
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| Formato: | Dissertação |
| Idioma: | por |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/23919 |
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| Resumo: | The species of Brazilian primates Callicebus barbarabrownae, Callicebus coimbrai and
Sapajus xanthosternos are at risk of extinction. One of the causes of this scenario is the
fragmentation of the areas of occurrence of these species in the Caatinga and Mata
Atlântica. In this context, the present study has as objective a) characterize the fragments
with occurrence to each one of these three species; b) compare the fragments of the area
of occupation with the other of its extension of occurrence where each specie is covered;
c) compare the three species about the characteristics of the fragments, taking the inherent
differences to each specie and each biome. To identify the forest fragments of the
extension of occurrence of each species and identify the fragments with confirmed
presence it was utilized records of occurrence of the species and images of satellite of the
Normalized Difference Vegetation Index (NDVI) shared by Hansen at al (2013). To
characterize the fragments were utilized several metrics of the landscape, of form and of
isolation. These three species of primates usually occurred in small, regular and with
complex borders fragments. However, when it was compared with their respective
extension of occurrence areas, the three studied species usually occurred in fragments
with bigger area, more regular form and more complex and too isolated borders,
demonstrating that these primates do not occur by coincidence. To C. coimbrai the size
of the nearest neighboring fragment showed as more important than isolation. Their
fragments with occurrence have bigger rate of proximity than the fragments of extension
of occurrence, what infer in a bigger presence of fragments in the matrix. Among the
analyzed characteristics of the fragments, the form (perimeter/area and complexity of the
border) was the most determined in the occurrence of these three species of primates in
fragmented environments. After the form, the most important explanatory variables were
area and isolation (to C. coimbrai). When the there species were compared, it was
observed that C. barbarabrownae had inhabited smaller and more regular areas, with less
complex borders and more isolated than other two species, possibly because of its
inhabitation in Caatinga, when the other two species predominately or just occurred in
Mata Atlântica. C. coimbrai and S. xanthosternos showed fragments with similar
occurrence about their characteristics of form and isolation, possibly because they have
inhabited the same over-fragmented habitat despite that they have differences not only in
the use, as in the requirement of resources. Thus, these three primates require require the
creation of unites of conservation that protect fragments that has the characteristics of
form, area and isolation that determine their presences and the creation of ecological
corridors to increase the connectivity among the fragments, that has seen the large
isolation of the fragments in their respective areas of occupation. |
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