Density and population size of mammals introduced on a land-bridge island in southeastern Brazil

Autor(es)

Bovendorp, Ricardo Siqueira ; Galetti, Mauro ^[2]

• Tipo de documento: Artigo Científico
• Fonte: Biological Invasions; v. 9, n. 3, p. 353-357, Apr. 2007.
• Área do conhecimento: Ciências Biológicas - Ecologia
• Assunto(s): Áreas de conservação Florestas tropicais Animais em extinção Ubatuba (SP)

Resumo

The introduction of alien species is one of the main threats to the conservation of native species, especially in island ecosystems. Here, we report on the population growth of 15 species of mammals introduced in 1983 on the island of Anchieta, an 828 ha land-bridge island in southeastern Brazil. We estimated the density of mammals through 296 km of line transect census. Five species introduced became extinct (coypu, brocket deer, six-banded armadillo, nine-banded armadillo, maned three-toed sloth); six became overabundant (marmoset, coati, agouti, seven-banded armadillo, and capybara); one has a stable population (capuchin monkey). Anchieta Island has the highest density of mammals in the entire Atlantic forest (486.77 ind/km2), especially nest predators (232.83 ind/km2) and herbivores (253.58 ind/km2). Agoutis (Dasyprocta spp.) and marmosets (Callithrix penicillata) were, by far, the species with the highest population growth. The high density of mammals in this island may have strong consequences for plant recruitment and bird diversity. (AU)

• Processo FAPESP: 01/14463-5 - Diagnóstico das populações de aves e mamíferos cinegéticos nas unidades de conservação da Mata Atlântica de São Paulo
• Beneficiário: Mauro Galetti Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular