Distribuição do maracanã-verdadeiro Primolius maracana (psittacidae): preferência de hábitat e fatores que influenciam na manutenção de sua populações remanescentes.
“…Durante duas oportunidades, nos dias 7 e 8 de novembro de 2008, foi observado um casal pousando no interior dos remanescentes florestais mais estruturados da fazenda (26º29'08"S, 49º30'44"O). Anteriormente citada por Rosário (1996) através de exemplares depositados em museu, a espécie foi colocada como provavelmente extinta no estado (Nunes 2003). Atualmente há registros fotográficos (disponíveis no site www.wikiaves.com.br) para regiões de menor altitude no vale do Itajaí, especialmente nos meses de maio a setembro.…”
“…Durante duas oportunidades, nos dias 7 e 8 de novembro de 2008, foi observado um casal pousando no interior dos remanescentes florestais mais estruturados da fazenda (26º29'08"S, 49º30'44"O). Anteriormente citada por Rosário (1996) através de exemplares depositados em museu, a espécie foi colocada como provavelmente extinta no estado (Nunes 2003). Atualmente há registros fotográficos (disponíveis no site www.wikiaves.com.br) para regiões de menor altitude no vale do Itajaí, especialmente nos meses de maio a setembro.…”
“…Efforts must be concentrated on conserving the population of P. maracana in the region of the Caetetus Ecological Station because this is the largest remaining population of this species in the southern part of its distribution (Nunes 2003). This population could serve as a source of blue-winged macaws for the colonization of other areas from which the species has been extinguished.…”
Section: Implications and Recommendations For Conservationmentioning
confidence: 99%
“…In Sã o Paulo state, the blue-winged macaw was once widespread in semideciduous forests, but these have been drastically reduced to less than 2% of their original extent (Viana and Tabanez 1996) and the species is now restricted to just a few sites (Nunes 2003). The Caetetus Ecological Station (CES) is one of the largest and most important remnants of semideciduous forest in Sã o Paulo state (Cullen et al 2000), and it has the largest population of blue-winged macaws in the southern part of this species' original range (Nunes 2000).…”
Parrots are the most threatened group of birds in the world, mainly because of the reduction and fragmentation of their natural habitats. However, few studies have investigated the dynamics of parrot populations in disturbed landscapes on a broad scale. In this paper, we studied the ecological interactions of the vulnerable blue-winged macaw (Primolius maracana) in a fragmented landscape surrounding a large protected park in southeastern Brazil. We sampled 36 forest fragments that varied in size, characteristics, degree of isolation and type of surrounding matrix in order to assess the importance of habitat features on the maintenance of these birds. Blue-winged macaws were recorded in 70% of the satellite remnants that were sampled, which included large and small blocks of forest. These areas were used as sites for feeding, nesting or overnight rests, and also provided connectivity for birds' displacements. However, the frequency of macaw visits varied among the remnants, and this was related to habitat features such as patch size, human use of surrounding land, and the proximity to the protected park, to urban areas and to the birds' roosting areas. In general, landscape-scale parameters explained more of the variation in the frequency of visits by macaws than did patch-scale parameters. These results demonstrate the importance of landscape mosaics for the survival of blue-winged macaws.
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