Acknowledgements
We thank the PREVET staff for their help in sample
collection and Priscila Viau for her assistance in the
hormonal assays. We also thank CAPES and FAPESP (process
2008/05760-05) for the fellowship (RSA) and CNPq
(Universal 475596/2009-9), Petrobras Ambiental (Projeto
Mamíferos Aquáticos da Amazônia: Conservac¸ ão e
Pesquisa), and Associac¸ ão Amigos do Peixe-boi – AMPA for
their financial support.