Cormorán Chuita

Identificación

The red-legged cormorant is a medium-sized seabird, with a long neck, streamlined body, webbed feet and a long, thin hooked bill. Its body length is 71–76 centimetres (28–30 in), with an average wingspan of 91 cm (36 in). It weighs 1.3–1.5 kilograms (2.9–3.3 lb). There is no sexual dimorphism between the male and female birds.<p>The red-legged cormorant's appearance is unmistakable. Breeding adults have a smoky grey body, with a slightly paler underside. They have scattered areas of white filoplumes behind the eyes and down the neck. The wing coverts have a speckled, silvery grey appearance, followed by broad black wing tips. The tail is also black. The eyes are green, surrounded by sixteen tiny blue marks. The bill is yellow, shading to orange toward the base, the gular skin is a vibrant orange or red. The legs and feet are a striking coral red.<p>Non-breeding adults look similar to breeding adults. They lack the white filoplumes, the wing coverts appear less silvery, but more dark grey, and the bill and gular skin are duller in colouration.<p>Juvenile red-legged cormorants usually possess paler, brown plumage with a speckling of white around the throat. Juvenile plumage colouration can be highly variable between the Atlantic and Pacific coasts. Their eyes are grey and their bills and gular skin range from black to orange. The legs and feet can be a dull orange to a reddish black.

Taxonomía

The red-legged cormorant was traditionally placed within the genus Phalacrocorax, but this assignment has been contested in recent years. Some phylogenetic studies have suggested that this species should be placed within Notocarbo, finding it to be most closely related to other southern-hemisphere shags, such as the spotted shag. A 2014 study found it to represent the second most basal genus of cormorant, with only Microcarbo being more basal, and thus reclassified into the genus Poikilocarbo. This classification was followed by the IOC in 2021. It has been suggested that the population of red-legged cormorants on the Atlantic coast are a separate subspecies. They are slightly smaller and have marginally paler plumage compared to the birds of the Pacific coast.<p>Poikilocarbo is thought to have diverged from the rest of the Phalacrocoracidae between 12.0 - 13.5 million years ago.

Nombre científico

Poikilocarbo gaimardi

Autoridad

(Garnot, 1828)

Orden

Suliformes

Familia

Phalacrocoracidae

Género

Poikilocarbo

Distribución y hábitat

The red-legged cormorant is native to the coast of South America. On the Pacific coast it ranges from Macabi Island, Peru to Chiloe Island, Chile. There are small isolated populations on the Atlantic coast scattered across Santa Cruz, Argentina. It rarely occurs further south than the Strait of Magellan.<p>Red-legged cormorants nest sparsely on steep rock faces, including coastal cliffs, rocky islets, and sea caverns. They become virtually undetectable against these rocky outcrops by their speckled grey plumage, with the exception of their colourful bills and feet. They forage within inshore bodies of water and in shallow offshore waters.

Migración

Especie residente

Comportamiento

Patrón migratorio: Especie residente.

Conservación

Tendencia poblacional: en declive.

Tendencia poblacional

en declive