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Catharacta chilensis 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Charadriiformes Stercorariidae

Scientific Name: Catharacta chilensis (Bonaparte, 1857)
Common Name(s):
English – Chilean Skua
Synonym(s):
Stercorarius chilensis (Bonaparte, 1857)
Taxonomic Source(s): SACC. 2005 and updates. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.
Taxonomic Notes: Catharacta chilensis (del Hoyo and Collar 2014) was previously placed in the genus Stercorarius.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Butchart, S., Calvert, R., Ekstrom, J. & Harding, M.
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 small, 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.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This predatory species ranges from central Peru round Tierra del Fuego to north Argentina, breeding from central Chile to the southern tip of Argentina (del Hoyo et al. 1992).
Countries occurrence:
Native:
Argentina; Chile; Peru
Vagrant:
Antarctica; Brazil; Ecuador; Uruguay
Present - origin uncertain:
Falkland Islands (Malvinas)
Additional data:
♦ Continuing decline in area of occupancy (AOO):Unknown
♦ Extreme fluctuations in area of occupancy (AOO):No♦ Estimated extent of occurrence (EOO) - km2:1140000
♦ Continuing decline in extent of occurrence (EOO):Unknown♦ Extreme fluctuations in extent of occurrence (EOO):No
♦ Continuing decline in number of locations:Unknown
♦ Extreme fluctuations in the number of locations:No
Range Map:Click here to open the map viewer and explore range.

Population [top]

Current Population Trend:Stable
Additional data:
♦ Continuing decline of mature individuals:Unknown
♦ Extreme fluctuations:No♦ Population severely fragmented:No
♦ Continuing decline in subpopulations:Unknown
♦ Extreme fluctuations in subpopulations:No♦ All individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:The Chilean Skua is a marine species occurring especially in channels and straits of coastal South America. It breeds on islands and remote mainland coastal areas. Breeding begins in November, with individuals forming colonies of high densities (del Hoyo et al. 1992).
Systems:Terrestrial; Marine
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):17.2
Movement patterns:Not a Migrant
Congregatory:Congregatory (and dispersive)
Citation: BirdLife International. 2016. Catharacta chilensis. The IUCN Red List of Threatened Species 2016: e.T22694210A93442128. . Downloaded on 23 April 2018.
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