Black-throated Diver Gavia arctica   [Linnaeus, 1758]

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Order: Gaviiformes Family: Gaviidae
BTO Codes: BV, BLTDI EURING No: 30
Number in Britain: 220 Pairs (Summer)
Conservation Status:
UK: AMBER
European: 3 Concern, most not in Europe; Vulnerable
Global: (Details)
Status in UK: (A)  Migrant/Resident Breeder, Winter Visitor
Subspecies: arctica recorded in Britain (of 2 subsp. in the world)
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Length: 66 cm Wingspan: 120 cm Weight: M: 3.4 kg   F: 2.3 kg    
Scientific name from: L.: Gavia, a seabird described by Pliny and Gr.: arktikos=northern
World Distribution: BREEDS: Eurasian arctic & w Alaska, WINTERS: south to s Europe, c Asia, se China and s Alaska
Habitat: Deep lakes
Diet: Fish at depths to 6m, usually submerged less than 1 minute
Identification Tips:
  Images from IBC or search flickr
  Videos from IBC
  Sound from xeno-canto
Crossley ID photos BTO ID Workshop

Population and Distribution

Population Trend: No population trend available
Distribution: No distribution maps available
British Population Size:
    Summer: 220 Pairs in 2006
    Winter: 560 individuals in 2004/05 - 2008/09
    First Record: 1743
    Latest Survey: Musgrove, A. et al. (2013) British Birds 106:64-100
    Conservation Status: AMBER because Species of European Concern, Small Breeding Population, Small Non-breeding Population,
   Previous Assessments: 2002-2007 AMBER     1996-2001 AMBER  
   Races of Concern: arctica AMBER (European Concern)
Habitat Occupancy (in the Breeding Season):
    No habitat data from BBS
European Population Size:
    Summer: 16 to 22 thousand pairs
Population Assesment from Birds in Europe
Distribution in Europe mapped by the EBCC Atlas
Listed on the Appendices/Schedules of: WCA(I), WBD(I), Bern(II), Bonn(II*), AEWA
Survey Results:

Breeding and Survival

Egg Size: 84 x 52 mm Egg Weight: 122.0 g (of which 9 % is shell)
Number of Nest Records: 4
Clutch Size: 2 eggs
Incubation: 28- 30 days   by the: Male + Female
Fledging: 60 - 65days as: Precocial, downy
First Clutches Laid: Unavailable
Number of Broods: 1
Number Ringed: Annual Totals
Adult Survival: 0.890 ± 0.010       
Juvenile Survival: No data
Age at First Breeding: 3 years Typical Lifespan: 12 years
Maximum Recorded Age: Too few birds ringed
Read a summary of Ringing Recoveries

Biometrics

Ring Size: K*
Wing Length Adult: Insufficient Data
Juvenile: Insufficient Data
Male: Insufficient Data
Female: Insufficient Data
Weight Adult: Insufficient Data
Juvenile: Insufficient Data
Male: Insufficient Data
Female: Insufficient Data

Other Names

Black-throated/Arctic Loon
Has Included Gavia pacifica 
Gaelic: Learga-dhubh Welsh: Trochydd Gyddfddu
Danish: Sortstrubet lom Dutch: Parelduiker
Finnish: Kuikka French: Plongeon arctique
German: Prachttaucher Hungarian: Sarki búvár
Icelandic: Glitbrúsi Irish: Lóma Artach
Italian: Strolaga mezzana Norwegian: Storlom
Polish: Nur czarnoszyi Portuguese: Mobêlha-árctica
Spanish: Colimbo ártico Swedish: Storlom

For More Information...

Books and Monographs:
   Rankin, N. 1947 The haunts of British divers Collins, London [998 RAN]
See Also:
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Wikipedia entry
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BirdLife species page
Recent sightings and information from BirdGuides