Animalia > Chordata > Aves > Gaviiformes > Gaviidae > Gavia > Gavia pacifica

Gavia pacifica (Pacific Loon)

Synonyms: Colymbus pacificus (homotypic); Gavia arctica pacifica
Language: French; Spanish

Wikipedia Abstract

The Pacific loon or Pacific diver (Gavia pacifica), is a medium-sized member of the loon, or diver, family. It may be conspecific with black-throated diver/Arctic loon, which it closely resembles. The genus name Gavia comes from the Latin for "sea mew", as used by ancient Roman naturalist Pliny the Elder. The specific epithet pacifica is Latin for the Pacific Ocean, the term meaning "peaceful". It breeds on deep lakes in the tundra region of Alaska and northern Canada as far east as Baffin Island, and in Russia east of the Lena River.
View Wikipedia Record: Gavia pacifica

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 24.5669
EDGE Score: 3.2413


Clutch Size [4]  2
Clutches / Year [2]  2
Fledging [2]  61 days
Global Population (2017 est.) [3]  840,000
Incubation [6]  29 days
Maximum Longevity [2]  28 years
Water Biome [1]  Lakes and Ponds, Coastal
Adult Weight [2]  5.474 lbs (2.483 kg)
Birth Weight [4]  95 grams
Female Weight [2]  4.663 lbs (2.115 kg)
Male Weight [2]  6.288 lbs (2.852 kg)
Weight Dimorphism [2]  34.8 %
Breeding Habitat [3]  Arctic tundra, Boreal forests
Wintering Geography [3]  Pacific Coast
Wintering Habitat [3]  Coastal marine
Diet [5]  Carnivore (Invertebrates), Piscivore, Herbivore
Diet - Fish [5]  70 %
Diet - Invertibrates [5]  20 %
Diet - Plants [5]  10 %
Forages - Water Surface [5]  100 %
Female Maturity [2]  2 years 9 months
Male Maturity [2]  3 years


Protected Areas


Important Bird Areas

Name Location  IBA Criteria   Website   Climate   Land Use 
Active Pass Canada A4i
Baynes Sound Canada A4i
Kuril islands (between Urup and Paramushir) Russia (Asian) A1, A4i, A4ii, A4iii  
Rasmussen Lowlands Canada A4i, A4iii
West Chaun plain Russia (Asian) A1, A3, A4i

Biodiversity Hotspots

Name Location Endemic Species Website
Japan Japan No

Prey / Diet

Prey / Diet Overlap


Ursus arctos (Grizzly Bear)[7]
Vulpes vulpes (Red Fox)[7]


Range Map

External References

NatureServe Explorer


Attributes / relations provided by
1Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at
2Nathan P. Myhrvold, Elita Baldridge, Benjamin Chan, Dhileep Sivam, Daniel L. Freeman, and S. K. Morgan Ernest. 2015. An amniote life-history database to perform comparative analyses with birds, mammals, and reptiles. Ecology 96:3109
3Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
4Terje Lislevand, Jordi Figuerola, and Tamás Székely. 2007. Avian body sizes in relation to fecundity, mating system, display behavior, and resource sharing. Ecology 88:1605
5Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
6del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
7Making The Forest And Tundra Wildlife Connection
8Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 Wildfinder Database
Biodiversity Hotspots provided by Critical Ecosystem Partnership Fund
Abstract provided by DBpedia licensed under a Creative Commons License
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset accessed via on 2023-06-13; License: CC BY 4.0