NT
Heermann's Gull Larus heermanni



Family: Laridae (Gulls, Terns, Skimmers)

Authority: Cassin, 1852

Red List Category

Criteria: D2

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Justification of Red List category
This species is considered Near Threatened as it has a highly restricted breeding range, with 90% of the world population breeding on a single small island. Nesting populations fluctuate widely in response to climatic events, although these fluctuations are less than one order of magnitude. It is likely to be at high risk from catastrophic events or local anthropogenic changes, and should be carefully monitored.



Population size: 300000

Population trend: Unknown

Extent of occurrence (breeding/resident): 1,100,000 km2

Country endemic: No

Attributes
Land-mass type - oceanic island
Land-mass type - continent
Realm - Nearctic
Realm - Neotropical
IUCN Ecosystem -- Marine biome

Recommended citation
BirdLife International (2017) Species factsheet: Larus heermanni. Downloaded from http://www.birdlife.org on 20/10/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 20/10/2017.