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Stercorarius lonnbergi

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AVES CHARADRIIFORMES STERCORARIIDAE

Scientific Name: Stercorarius lonnbergi
Species Authority: Mathews, 1912
Common Name/s:
English – Brown Skua
Taxonomic Notes: Catharacta skua, C. lonnbergi, C. antarctica and C. maccormicki (Sibley and Monroe 1990, 1993), cross-regional species, are retained as separate species contra Christidis and Boles (1994) and Turbott (1990) who include lonnbergi and antarctica as subspecies of C. skua and AERC TAC (2003) who include C. maccormicki as a subspecies of C. skua. We accept the view in Chu et al. (2009) that Catharacta is best merged in Stercorarius.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2012
Assessor/s: BirdLife International
Reviewer/s: Butchart, S. & Symes, A.
Contributor/s:
Justification:
This species has a very large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size may be moderately small to large, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
History:
2009 – Least Concern
2008 – Least Concern
2004 – Least Concern

Geographic Range [top]

Range Description: The Brown Skua is found on the Antarctic Peninsula and subantarctic islands of the Atlantic, Indian and Pacific Oceans, wintering near or slightly dispersed from the breeding area (del Hoyo et al. 1996).
Countries:
Native:
Antarctica; Australia; Bouvet Island; French Southern Territories (the); Heard Island and McDonald Islands; Maldives; New Zealand; Seychelles; South Africa; South Georgia and the South Sandwich Islands; Sri Lanka
Vagrant:
India; Iran, Islamic Republic of
Present - origin uncertain:
Argentina; Chile; Falkland Islands (Malvinas); Norfolk Island; Saint Helena, Ascension and Tristan da Cunha
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The population is placed in the band 10,000-19,999 individuals, equating to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: This marine species is found on or around subantarctic islands populated by burrow-nesting seabirds or penguins. It is highly predatory, feeding mainly on other birds but will also scavenge around fishing boats and ships and feed at sea. Breeding begins in October and November. Birds are loosely colonial but highly territorial, nesting on grass, gravel or bare rock. Individuals at some northern colonies are resident throughout the year, but will disperse over the sea where conditions are harsher (del Hoyo et al. 1996).
Systems: Terrestrial; Marine
Citation: BirdLife International 2012. Stercorarius lonnbergi. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 23 May 2013.
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