Species: Stercorarius pomarinus

Pomarine Jaeger

Species

Birds

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Salish Sea-reliant birds

Encyclopedia of Puget Sound

Classification

Kingdom

Animalia

Phylum

Craniata

Class

Aves

Order

Charadriiformes

Family

Stercorariidae

Genus

Stercorarius

NatureServe

Source:
ELEMENT_GLOBAL.2.106141

Classification

Other Global Common Names

Mindrião-Pomarino - Salteador Pomarino, Pagalo - labbe pomarin

Informal Taxonomy

Animals, Vertebrates - Birds - Other Birds

Formal Taxonomy

Animalia - Craniata - Aves - Charadriiformes - Stercorariidae - Stercorarius - Perhaps is more closely related to CATHARACTA than other STERCORARIUS (AOU 1998).

Ecology and Life History

Migration

false - false - true - Migrates northward April-May, arriving on nesting grounds late May-early June. Most leave nesting area in North America mid-August to early September. Beaufort Sea breeders apparently winter in Pacific (Johnson and Herter 1989).

Non-migrant

false

Locally Migrant

false

Food Comments

On breeding ground feeds on small mammals (lemmings and voles), small birds and their eggs, carrion. At sea in winter robs food from gulls, terns, shearwaters, picks up live fish from surface of water, eats offal thrown overboard.

Reproduction Comments

Lays 2-3 eggs in June. Both sexes incubate eggs for 27-28 days. Nestlings semi-precocial and downy. Capable of first flight 35-42 days after hatching (Terres 1980); fledging requires 28-37 days (average about 31 days), occurs generally in mid-August in northern Alaska (see Johnson and Herter 1989). May not breed in years with low lemming populations. Density 6-8 pairs per sq km in northern Alaska in years when lemming abundant.

Length

122

Weight

740

Conservation Status

NatureServe Global Status Rank

Global Status Last Reviewed

1996-11-26

Global Status Last Changed

1996-11-26

Other Status

LC - Least concern

Distribution

Conservation Status Map

Global Range

BREEDING: western and northern Alaska, arctic Canada, Greenland, Spitsbergen, northern Eurasia. Nonbreeders occur in summer off Alaska and British Columbia, in central Canada, and in Atlantic from Labrador and Newfoundland south to New England. NON-BREEDING: at sea primarily from latitude of North Carolina to West Indies and off Africa; latitude of southern California south to Peru, and off eastern Australia; regularly in low numbers near Hawaii.

ELEMENT_GLOBAL.2.106141