Geographical and seasonal distributions of the seedeaters Sporophila bouvreuil and Sporophila pileata (aves: Emberizidae)

Autor(es)

Érika Machado ^[1] ; Luís Fábio Silveira ^[2]

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo. Instituto de Biociências. Departamento de Zoologia - Brasil

^[2] Universidade de São Paulo. Instituto de Biociências. Departamento de Zoologia - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Papéis Avulsos de Zoologia (São Paulo); v. 50, n. 32, p. 517-533, 2010-00-00.

Resumo

Many species in the genus Sporophila are migratory. Migration patterns, while poorly studied, may be influenced by seed production which can be very seasonal in some regions. The distribution of S. bouvreuil extends from the Amazon and Suriname south through a large part of the open regions of Brazil. Sporophila pileata, on the other hand, is found in southeastern and southern Brazil as well as Argentina and Paraguay. Both of these species migrate, but their movement patterns are poorly known. To better understand the geographical and the seasonal distributions of S. bouvreuil and S. pileata, we grouped the records into two categories: the breeding season (September to March) and the putative migration season (April to August). We found two areas of sympatry between S. bouvreuil and S. pileata in the Brazilian states of Minas Gerais and São Paulo. For S. bouvreuil we suggest that populations that breed in the Amazon migrate to the Cerrado or Caatinga, where they will encounter resident populations of the same species. These resident populations may take part in short distance migrations. Sporophila pileata, on the other hand, occur in the Cerrado and open areas within the Atlantic Forest and it is not yet possible to determine migratory tendencies or destinations in the non-breeding season. (AU)

• Processo FAPESP: 06/53819-3 - Taxonomia, distribuição e conservação dos caboclinhos do complexo Sporophila bouvreuil (aves: Emberezidae)
• Beneficiário: Érika Machado Costa Lima
• Modalidade de apoio: Bolsas no Brasil - Mestrado