Acknowledgements
I thank MaÂrio Ferreira, S.V. Wilson and two
anonymous reviewers for comments on the
manuscript. The Pew Scholars Program in
Conservation and the Environment, the National
Council of Scienti®c and Technological
Development (CNPq AI 350230/97-98) and the
National Institute for Research in the Amazon
(INPA PPI 5-3150) provided ®nancial support.