Serreta Brasileña

Identificación

This merganser is a dark, slender duck with a shiny dark-green hood with a long crest, which is usually shorter and more worn-looking in females. Upperparts are dark grey while the breast is light grey, getting paler toward the whitish belly, and a white speculum is particularly noticeable in flight.: 81796  It has a long thin jagged black bill with red feet and legs. Although females are smaller with a shorter bill and crest, both sexes are alike in color. The slender ducks range in size from 49 to 56 centimetres (19 to 22 in) as an adult. Young Brazilian mergansers are mainly black with white throat and breast.<p>The Brazilian mergansers are generally silent birds, but may make barking calls in certain situations. Four calls have been recorded. A harsh krack-krack acts as an alarm call emitted in flight. Males make a barking dog-like call, females make a harsh rrr-rrrr and the contact call is a soft rak-rak-rak. Ducklings give a high pitched ik-ik-ik.<p>Depending on the availability of suitable nesting and feeding sites, Brazilian merganser pairs occupy permanent territories of 8-to-14-kilometre (5.0 to 8.7 mi) stretches of rivers. Tree cavities, rock crevices, or disused burrows predominantly made by armadillos are the ideal places for these mergansers to build their nests. It is thought the breeding season is during the austral winter, when rain is minimal and water levels are low, but it may vary geographically. The Brazilian merganser usually lays three to six eggs in June and July, with the chicks hatching during the following July and August. The young are capable of flight by September and/or October. Only the female birds incubate the eggs, but both parents care for the young. This is a very unusual behavior in ducks for both parents to help raise the young birds including direct provision of food to young. Adult Brazilian mergansers are believed to remain on the same territory all year round, but there is not very much information about their movements and dispersal, so information on this is presently speculative in nature.<p>Fish is the Brazilian merganser's main food, and they also eat molluscs, insects and their larvae. The birds, usually in pairs, capture fish by diving in river rapids and backwater.

Taxonomía

Nombre científico

Mergus octosetaceus

Autoridad

Vieillot, 1817

Orden

Anseriformes

Familia

Anátidos

Género

Mergus

Distribución y hábitat

The slender Brazilian mergansers live in low densities in remote and mountainous regions where it inhabits clean rivers and streams with river rapids and riparian vegetation. Brazilian mergansers are very territorial birds defending large stretches of river and the land surrounding the fast-flowing water. They are recognized as a resident species that does not abandon the watercourses where it established its territory. They do not move or want to move once their habitats have disappeared. The birds need large territories and their habitat is fast dwindling.

Migración

Resident species

Conservación

Tendencia poblacional

declining