1. Graduate Programme in Agroecology; Maranhão State University; Cidade Universitária Paulo VI; PO Box 3004 Tirirical 65054-970 São Luís MA Brazil
2. Graduate Programme in Ecology and Conservation; Federal University of Sergipe; Av. Marechal Rondon s/n Jardim Rosa Elze 49100-100 São Cristovão SE Brazil
3. Embrapa Coastal Tablelands; Av. Beira-Mar 3250 Jardins PO Box 44 Aracaju SE Brazil