Black-browed albatross

Appearance

The black-browed albatross is a medium-sized albatross, at 80 to 95 cm long with a 200 to 240 cm wingspan and an average weight of 2.9 to 4.7 kg. It can have a natural lifespan of over 70 years. It has a dark grey saddle and upperwings that contrast with the white rump, and underparts. The underwing is predominantly white with broad, irregular, black margins. It has a dark eyebrow and a yellow-orange bill with a darker reddish-orange tip. Juveniles have dark horn-colored bills with dark tips, and a grey head and collar. They also have dark underwings. The features that distinguish it from other mollymawks are the dark eyestripe which gives it its name, a broad black edging to the white underside of its wings, white head and orange bill, tipped darker orange. The Campbell albatross is very similar but with a pale eye. Immature birds are similar to grey-headed albatrosses but the latter have wholly dark bills and more complete dark head markings.

Naming

The origin of the name "melanophris" comes from two Greek words "melas" or "melanos", meaning "black", and "ophris", meaning "eyebrow", referring to dark feathering around the eyes.

Status

Until 2013, the IUCN classified this species as endangered due to a drastic reduction in population. Bird Island near South Georgia Island had a 4% per year loss of nesting pairs, and the Kerguelen Island population had a 17% reduction from 1979 to 1995. Diego Ramírez decreased in the 1980s but has rebounded recently, and the Falklands had a surge in the 1980s probably due to abundant fish waste from trawlers; however, recent censuses have shown drastic reduction in the majority of the nesting sites there. There has been a 67% decline in the population over 64 years.

Increased longline fishing in the southern oceans, especially around the Patagonian Shelf and around South Georgia has been attributed as a major cause of the decline of this bird, The black-browed albatross has been found to be the most common bird killed by fisheries. Trawl fishing, especially around the Patagonian Shelf and near South Africa, is also a large cause of deaths.

Conservation efforts underway start with this species being placed on Convention on Migratory Species Appendix II, and Agreement on the Conservation of Albatrosses and Petrels Annex 1, it is being monitored on half of the islands, and most of the breeding sites are reserves. Heard Island, McDonald Island, Macquarie Island, and the New Zealand islands are World Heritage Sites. An initial Chilean census has also been completed.

Behavior

:File:FAL-2016-New Island, Falkland Islands-Black-browed albatross 01.jpgBlack-browed albatross preening its newborn.

Colonies are very noisy as they bray to mark their territory, and also cackle harshly. They use their fanned tail in courting displays.

Habitat

The black-browed albatross is circumpolar in the southern oceans, and it breeds on 12 islands throughout that range. In the Atlantic Ocean, it breeds on the Falklands, Islas Diego Ramírez, and South Georgia. In the Pacific Ocean it breeds on Islas Ildefonso, Diego De Almagro, Islas Evangelistas, Campbell Island, Antipodes Islands, Snares Islands, and Macquarie Island. Finally in the Indian Ocean it breeds on the Crozet Islands, Kerguelen Islands, Heard Island, and McDonald Island. There are an estimated 1,220,000 birds alive with 600,853 breeding pairs, as estimated by a 2005 count. Of these birds, 402,571 breed in the Falklands, 72,102 breed on South Georgia Island, 120,171 breed on the Chilean islands of Islas Ildefonso, Diego De Almagro, Islas Evangelistas, and Islas Diego Ramírez. 600 pairs breed on Heard Island, Finally, the remaining 5,409 pairs breed on the remaining islands. This particular species of albatross prefers to forage over shelf and shelf-break areas. Falkland Island birds winter near the Patagonian Shelf, and birds from South Georgia forage in South African waters, using the Benguela Current, and the Chilean birds forage over the Patagonian Shelf, the Chilean Shelf, and even make it as far as New Zealand. It is the most likely albatross to be found in the North Atlantic due to a northerly migratory tendency. There have been 20 possible sightings in the Continental United States.

Reproduction

This species normally nests on steep slopes covered with tussock grass and sometimes on cliffs; however, on the Falklands it nests on flat grassland on the coast. They are an annual breeder laying one egg from between 20 September and 1 November, although the Falklands, Crozet, and Kerguelen breeders lay about three weeks earlier. Incubation is done by both sexes and lasts 68 to 71 days. After hatching, the chicks take 120 to 130 days to fledge. Juveniles will return to the colony after two to three years but only to practice courtship rituals, as they start breeding around the 10th year.

Food

The black-browed albatross feeds on fish, squid, crustaceans, carrion, and fishery discards. This species has been observed stealing food from other species.