Bird Community Composition And Species Abundance On Two Inshore Islands In The Atlantic Forest Region Of Brazil

Many endemic birds are threatened with extinction in Brazil's Atlantic forest and several inshore islands have been identified as key areas for bird conservation. We used a point count method to record forest birds on two of these islands, in the 22,500 ha Ilha do Cardoso State Park and the 5,600 ha Ilha Grande State Park, 450 km to the northeast. Our estimates of bird species richness was higher on Cardoso than Ilha Grande (75 versus 57 species), as was species diversity, and importance of Red List species (8 versus 2 species). The contribution of various families to the avifauna differed between the islands with Columbidae and Pipridae more common on Ilha Grande, and Trochilidae, Picidae and Formicariidae more dominant on Cardoso. Noteworthy were the abundance of Turdidae and the rarity of Psittacidae on both islands as compared to other sites in the region. Abundance of individual species on the two islands was uncorrelated. In fact, 34% and 49% of the species were recorded exclusively on Ilha Grande and Cardoso respectively. The avifauna, particularly on Ilha Grande, is depauperate and dominated by a few species with density estimates generally exceeding those found elsewhere in the neotropics. On Ilha Grande, these dominant species were mainly edge and secondary forest species.112181187Aleixo, A., Galetti, M., The conservation of the avifauna in a lowland Atlantic forest in south-east Brazil (1997) Bird Cons. Internatn, 7, pp. 235-261Anjos, dos, L., And Boçon, R., Bird communities in natural forest patches in southern Brazil (1999) Wilson Bull, 111, pp. 397-414Avanzo, V.C., Sanfilippo, L.F., Levantamento preliminar da avifauna de Ilha Comprida, São Paulo. (2000) Bol. CEO, 14, pp. 10-14Bell, H.L., A bird community of lowland rainforest in New Guinea. I. Composition and density of the avifauna (1982) Emu, 82, pp. 24-41(2000) Threatened birds of the world, , BirdLife International , Barcelona and Cambridge, UK: Lynx Editions and BirdLife InternationalBlake, J.G., Temporal variation in point counts of birds in a lowland wet forest in Costa Rica (1992) Condor, 94, pp. 265-275Buckland, S.T., Anderson, D.R., Burnham, K.P., Laake, J.L., Borchers, D.L., Thomas, L., (2001) Introduction to Distance Sampling: Estimating abundance of biological Population, , Oxford University Press, Oxford, UKGaletti, M., Martuscelli, P., Olmos, F., Aleixo, A., Ecology and conservation of the Jacutinga Pipile jacutinga in the Atlantic Forest of Brazil (1997) Biol. Cons, 82, pp. 31-39Göerck, J.M., Patterns of Rarity in the Birds of the Atlantic Forest of Brazil (1997) Cons. Biol, 11, pp. 112-118Göerck, J.M., Distribution of birds along an elevational gradient in the Atlantic forest of Brazil: Implications for the conservation of endemic and endangered species (1999) Bird Cons. Internatn, 9, pp. 235-253Guix, J.C., Martin, M., Mañosa, S., Conservation status of parrot populations in an Atlantic rainforest area of southeastern Brazil (1999) Biodiv. & Cons, 8, pp. 1079-1088Hutcheson, K., A test for comparing diversities based on the Shannon formula (1970) J. Theor. Biol, 29, pp. 151-154Margurran, A.E., (1988) Ecological diversity and its measurement, , Croom Helm, LondonMarsden, S.J., Changes in bird abundance following selective logging on Seram, Indonesia (1998) Cons. Biol, 12, pp. 605-611Marsden, S.J., Estimation of parrot and hornbill densities using a point count distance sampling method (1999) Ibis, 141, pp. 377-390Marsden, S.J., (2001) The status and abundance of birds on key inshore islands in the Atlantic forest region of Brazil, , Relatório. Manchester, UK: Manchester Metropolitan University, Manchester, UKMarsden, S.J., Jones, M.J., Linsley, M.D., Mead, C., Hounsome, M.V., The conservation status of the restricted-range lowland birds of Buru, Indonesia (1997) Bird Cons. Internatn, 7, pp. 213-233Marsden, S.J., Whiffin, M., Galetti, M., Bird diversity and abundance in forest fragments and Eucalyptus plantations surrounding a Brazilian Atlantic Forest reserve (2001) Biodiv & Cons, 10, pp. 737-751Marsden, S.J., Whiffin, M., Sadgrove, L., Guimarães Jr., P., Parrot populations and habitat use in and around two lowland Atlantic forest reserves, Brazil (2000) Biological Conservation, 96, pp. 209-217Martuscelli, P., Ecology and conservation of the Red-tailed Amazon Amazona brasiliensis in south-eastern Brazil (1995) Bird Cons. Internatn, 5, pp. 405-420Monroe Jr, B.L., Sibley, C.G., (1993) A world checklist of birds, , New Haven and London: Yale University PressMyers, N., Mittermeier, R.A., Mittermeier, C., Fonseca, G.A.B., Kent, J., Biodiversity hotspots for conservation priorities (2000) Nature, 403, pp. 853-858Olmos, F., Ilhabela State Park: A poorly known reserve in Southeast Brazil (1994) Neotrop. Prim, 2, pp. 10-11Parker III, T.A., Goerck, J.M., The importance of national parks and biological reserves to bird conservation in the Atlantic forest region of Brazil (1997) Orn. Monos, 48, pp. 527-541Redford, K.H., Monte Pascoal - indigenous rights and conservation in conflict (1989) Oryx, 23, pp. 33-36Reynolds, R.T., Scott, J.M., Nussbaum, R.A., A variable circular plot method for estimating bird numbers (1980) Condor, 82, pp. 309-313Ridgely, R.S., Tudor, G., (1989) The birds of South America. The Oscine passerines, 1. , Oxford: Oxford University PressRidgely, R.S., Tudor, G., (1994) The birds of South America. The Suboscine passerines, 2. , Oxford: Oxford University PressTerborgh, J., Robinson, S.K., Parker III, T.A., Munn, C.A., Pierpont, N., Structure and organisation of an Amazonian forest bird community (1990) Ecol. Monos, 60, pp. 213-238Thiollay, J.M., Structure, density and rarity in an Amazonian rainforest bird community (1994) J. Trop. Ecol, 10, pp. 449-481Wege, D.C., Long, A.J., Key areas for threatened birds in the Neotropics (1995) Birdlife Conservation Series, 5. , Cambridge, U