First Described (Guide)
(Bornschein, Reinert & Teixera, 1995)
Habitat
Littoral marshes, dominated by Scirpus californicus with other marsh vegetation such as grasses and bushes, riverine marshes, flooded plains with herbaceous vegetation and transition areas to mangrove swamps and flooded lowland florests with herbaceous strata. From sea-level - 5 m.
South-eastern Brazil in coastal Paraná and extreme north-eastern Santa Catarina.
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is 10,000 - 19,999 (2010) and decreasing.
Status EN
Habitat destruction and degradation caused by fires, conversion to allotments and landfills, disturbance from boat traffic on rivers during the breeding season, erosion due to water traffic, sand extraction from river margins, invasive vegetation and cattle-grazing, are the main threats.
For more information see BirdLife International Species Factsheet.
Voice
Both sexes deliver constant whistled and repeated 'piu-píc' or 'píc-piu' nasal notes, and both also deliver 'nhééé' calls and soft 'pic' contact calls.
Marsh Antwren (Formicivora acutirostris) [XC237548]
by Juha Honkala from Ba\u00eda de Guaratuba. Rio S\u00e3o Jo\u00e3o, Brazil (call, song)
Marsh Antwren (Formicivora acutirostris) [XC787762]
by Douglas Meyer from Guaratuba, Paran\u00e1, Brazil (call)
Subspecies
Recent extensive morphological and vocal study (completed subsequent to the organization of this chapter) suggested that species should be placed in genus Formicivora, being most closely related to Rusty-backed Antwren (Formicivora rufa) and Southern White-fringed Antwren (Formicivora grisea).
paludicola (Buzzetti et al., 2013) - South-eastern Brazil (São Paulo). Considered by some authors to be a distinct species, Marsh Antwren (Formicivora paludicola).
BirdLife International Species Factsheet