Authors: José A. Alves, Pedro M. Lourenço, Maria P. Dias, Luís Antunes, Teresa Catry, Helder Costa, Pedro Fernandes, Beatriz Ginja, João Jara, Ricardo Martins, Filipe Moniz, Sara Pardal, Telmo Pereira, Maria J. Rainho, Afonso Rocha, João C. Rodrigues & Miguel Rolo
Título: Monitoring waterbird populations on the Tejo, Sado and Guadiana estuaries, Portugal: 2011 report