Anatidae, Leach, 1820

Somenzari, Marina, Amaral, Priscilla Prudente do, Cueto, Víctor R., Guaraldo, André de Camargo, Jahn, Alex E., Lima, Diego Mendes, Lima, Pedro Cerqueira, Lugarini, Camile, Machado, Caio Graco, Martinez, Jaime, Nascimento, João Luiz Xavier do, Pacheco, José Fernando, Paludo, Danielle, Prestes, Nêmora Pauletti, Serafini, Patrícia Pereira, Silveira, Luís Fábio, Sousa, Antônio Emanuel Barreto Alves de, Sousa, Nathália Alves de, Souza, Manuella Andrade de, Telino-Júnior, Wallace Rodrigues & Whitney, Bret Myers, 2018, An overview of migratory birds in Brazil, Papéis Avulsos de Zoologia 58, pp. 1-66 : 3

Anatidae

Anas sibilatrix (MGT) : endemic to South America, breeding in southern Argentina, central Chile and on the Malvinas / Falkland Islands ( Chesser, 1994; Sick, 1997). Populations that breed in the southern part of the distribution migrate to lower latitudes during austral winter and reach southern Brazil ( Carboneras, 1992a). In Brazil, there are records of few individuals, which suggest that it is a marginal population that possibly represents less than 1% of the global population (ARA, 2016). For Rio Grande do Sul (RS) there are records in June and August ( Maurício & Dias, 1996) and isolated records in October, February and July ( Belton, 1984). Photographic records are restricted to September and October for RS and to September for São Paulo (SP) (WikiAves, 2016).

Anas discors (MGT) : breeds in North America from southern Alaska to central USA and the Gulf Coast. It spends the boreal winter in part of the USA, the Antilles, the Bahamas, Central America and northern South America, including northern Brazil ( Carboneras & Kirwan, 2016). In late August it reaches the floodplains of Marajó Island/Pará (PA) and lowlands of Maranhão (MA) ( Antas, 1987) probably in non-stop flights originating from its breeding sites. Juveniles banded in Canada and the USA (n = 93) between July and September were recovered in the Brazilian states of Acre (AC), PA, MA, Piauí (PI), Ceará (CE), Rio Grande do Norte (RN), Paraíba (PB), Minas Gerais (MG) and Rio de Janeiro (RJ) between December and February ( Mestre et al., 2010; MZUSP 42153 [PA, 1959, January]). In addition, there are records between January and March for Roraima (RR), Amazonas (AM), PA and MA ( Azevedo-Júnior, 2007; WikiAves, 2016). However, there are also records for RJ between April and August ( Sick, 1997; MZUSP 78523 [1966, May]), as well as for SP ( Silva-e-Silva & Olmos, 2007; WikiAves, 2016). For Paraná (PR) ( Vallejos et al., 2011) and RS, where it appears to be vagrant, there are records only in November ( Belton, 1978). However, the occurrence of this species outside northern Brazil is occasional and irregular.

Oxyura vittata (MGT) : occurs in Chile, Argentina and southern Brazil. Populations that breed to the south of the distribution migrate north during winter, especially from April to August , and reach RS and Mato Grosso do Sul (MS) ( Carboneras, 1992). In Brazil, this species occurs from January to July in RS, from January to May in Santa Catarina (SC), in February and March in PR and in July in MS ( SNA, 2016; WikiAves, 2016; MZUSP 2415 [ RS, 1894, April]) .