Country/territory: Falkland Islands (Malvinas)
IBA criteria met: A1, A2 (2006)
For more information about IBA criteria, please click here
Area: 1,035 hectares (10.35 km2)
Site description (2006 baseline)
Sea Lion Island is about 5 miles (8 km) from east to west
and 1.2 miles (2 km) at its widest part. The island is a
slightly inclined plateau with steep cliffs of about 30 m at
the south-western point and long sandy bays to the east.
Substantial parts of the coastline have dense Tussac,
protected by fencing, while there is mature original Tussac
at the eastern point. Red ash deposits visible below peat
layers on the southern coast show that Tussac stands were
burnt, probably in the 19th century. Habitat inland is
largely open heath and grassland. The island was
managed as a sheep farm from at least 1904 until about
1997 when it was cleared of all but a small flock of sheep.
Western coasts show evidence of overgrazing and soil
erosion. There are permanent ponds and boggy ground,
which are attractive to a variety of waterbirds. The island
was surveyed extensively in 1998 as part of the Ramsar
designation process.
Rum Islet, lying 0.6 miles (1 km) south of Sea Lion Island, is
only about 750 m long. It is very low lying with a beach of
large irregular boulders and rock slabs with considerable dead
kelp, ideal for Cobb’s Wrens. The island is almost covered by
Tussac up to 2 m tall, but it is easy to walk through because it
has been opened up by Southern Sea Lions.
Brandy Island is 1.2 miles (2 km) east of Sea Lion Island
and is covered with tall, dense Tussac. Apart from sheer
cliffs up to 15 m on the south-eastern coastline and shelf
rocks at the southern point, the beach consists of large
unstable boulders and it can be difficult to land.
Whisky Island is only 400 m east of Brandy. It lies east to
west with a boulder beach on the northern coast and
extensive shelf rock below cliffs up to 15 m along the
southern coast. Dense Tussac covers the ground above high
water mark.
Sea Lion Easterly lies about 5.6 miles (9 km) east of Sea
Lion Island and reaches no more than 17 m at its highest
southern and north-eastern points. Much of the central part
of the island is boggy, with two permanent ponds, one near
the northern point and one towards the south-western
point. It has a dense belt of tall, coastal Tussac and a beach
of large boulders.
Key biodiversity
Between 1983 and 1993, 53 species were recorded on Sea
Lion Island during fieldwork for the Breeding Birds Survey.
Of these, 43 were breeding or probably breeding, including
eight of the nine resident songbirds and five species of
penguins. The Macaroni Penguin occasionally breeds
among the Rockhoppers but not in sufficient numbers to
warrant site qualification. On Rum Islet, only 17 species
were recorded in November 1998, including 15 probably
breeding. Brandy Island had 26 species, of which 17 were
breeding or probably breeding. These included Common
Diving Petrels found incubating and the remains of a Sooty
Shearwater. Whisky Island had 19 species, with 13
probably breeding, while Sea Lion Easterly had 24 species,
of which 21 were breeding or probably breeding. The
Grey-backed Storm-petrel is present but breeding needs to
be confirmed.
The predator-free status of all five islands in the Sea Lion
group makes them important for small passerines and
burrowing petrels. It is noticeable that Tussacbirds and
Cobb’s Wrens are very numerous, particularly on the
beaches of the four smaller islands. These islands all
support at least one pair of Striated Caracaras but the
Ruddy-headed Goose was found only on Sea Lion Island,
where wetlands provide suitable habitat.
An interesting feature of the bird community of the group
is the current absence of the very conspicuous Long-tailed
Meadowlark over the past 10 years, though it is present at
Bull Point only 9 miles (15 km) away. However, it was
recorded on Sea Lion Island in 1915 and again in 1987
and 1992.
Endemic sub-species present include the White-tufted/
Rolland’s Grebe, Black-crowned Night-heron, Upland
Goose, Short-eared Owl, Dark-faced Ground-tyrant,
Falkland Pipit, Falkland Grass Wren and the Falkland
Thrush.
Non-bird biodiversity: Experimental plantings of Tussac made in 1985 produced useful results when compared with similar plantings at Port Howard and Keppel Island. Sea Lion Island is of particular interest for the large colony of breeding Southern Elephant Seals, which produce around 200 pups per year. These are the subjects of a long-term study by Italian researchers from the University of Rome. Southern Sea Lions also breed on the coasts, with 40 pups in 2003. The other small islands are used as haul-out sites for Southern Sea Lions and many Southern Elephant Seals, although no breeding takes place there. Sea Lion Island is popular with tourists for its diverse bird and mammal life. Because of the steeply shelving coastline, it is also one of the best places in the Falklands to see Killer Whales hunting and feeding on penguins and seals just offshore. In November 1998, 56 species of flowering plants were recorded on Sea Lion Island. The most interesting is the Fuegian Violet Viola magellanica. In the Falklands, this plant has been found only on Sea Lion Island, growing with Tussac on sand north of the lodge. It is not known how the plant reached this remote island. At least 12 species were introduced agricultural weeds or grasses and only three were endemics. In contrast, only two to six species of flowering plants could be found on each of the four smaller islands, although 12 species have been recorded on Sea Lion Easterly in the past. All these sppecies are natives, except for Groundsel Senecio vulgaris found on Rum, which is immediately south of Sea Lion Island.
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Sea Lion Islands Group (Falkland Islands (Malvinas)). Downloaded from
https://datazone.birdlife.org/site/factsheet/sea-lion-islands-group-iba-falkland-islands-(malvinas) on 23/12/2024.