LC
Cory's Shearwater Calonectris borealis



Taxonomy

Taxonomic note
Calonectris diomedea and C. borealis (del Hoyo and Collar 2014) were previously lumped as C. diomedea following Sibley and Monroe (1990, 1993), which was also formerly lumped with C. edwardsii following Hazevoet (1995), contra Brooke (2004).

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Least Concern
2015 Least Concern
2014 Least Concern
2012 Not Recognised
2010 Not Recognised
Species attributes

Migratory status full migrant Forest dependency Does not normally occur in forest
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 97,600,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 504000-507000 medium estimated 2012
Population trend Unknown suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 19.3 - - -

Population justification: The European population is estimated at 252,000-253,000 pairs, which equates to 504,000-507,000 mature individuals (BirdLife International 2015).

Trend justification:

The trend of the European breeding population is difficult to quantify owing to gaps in the data. However the largest population (Azores, with c. 75% of the European population) is not thought to be declining appreciably. It is therefore unlikely that the species is declining at a rate approaching >30% over ten years or three generations. A population recovery has been reported for the population on Selvagem Grande (Savage Islands, Madeira archipelago), with an estimated increase of 4.6% per year since 1980 (Granadeiro et al. 2006).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Algeria N Extant Yes
Angola N Extant Yes
Antigua and Barbuda N Extant Yes
Argentina N Extant Yes
Bahamas N Extant Yes
Barbados U Presence Uncertain
Belgium U Presence Uncertain
Benin N Extant Yes
Bermuda (to UK) N Extant Yes
Brazil N Extant Yes
Cameroon N Extant Yes
Canada N Extant Yes
Cape Verde N Extant Yes
Congo N Extant Yes
Congo, The Democratic Republic of the N Extant Yes
Costa Rica V Extant
Côte d'Ivoire N Extant Yes
Cuba U Presence Uncertain
Denmark U Presence Uncertain
Dominica U Presence Uncertain
Equatorial Guinea N Extant Yes
Faroe Islands (to Denmark) U Presence Uncertain
France N Extant Yes
French Guiana N Extant Yes
Gabon N Extant Yes
Gambia N Extant Yes
Germany U Presence Uncertain
Ghana N Extant Yes
Gibraltar (to UK) N Extant Yes
Guadeloupe (to France) V Extant
Guinea N Extant Yes
Guinea-Bissau N Extant Yes
Ireland U Presence Uncertain
Liberia N Extant Yes
Madagascar N Extant Yes
Martinique (to France) U Presence Uncertain
Mauritania N Extant Yes
Mexico N Extant Yes
Montserrat (to UK) U Presence Uncertain
Morocco N Extant Yes
Mozambique N Extant Yes
Namibia N Extant Yes
Netherlands U Presence Uncertain
New Zealand V Extant
Nigeria N Extant Yes
Norway U Presence Uncertain
Oman U Presence Uncertain
Panama V Extant Yes
Poland U Presence Uncertain
Portugal N Extant Yes Yes
Puerto Rico (to USA) U Presence Uncertain
São Tomé e Príncipe N Extant Yes
Senegal N Extant Yes
Serbia U Presence Uncertain
Sierra Leone N Extant Yes
South Africa N Extant Yes
Spain N Extant Yes Yes
St Helena (to UK) N Extant Yes
St Kitts and Nevis U Presence Uncertain
St Lucia U Presence Uncertain
St Pierre and Miquelon (to France) N Extant Yes
St Vincent and the Grenadines U Presence Uncertain
Suriname U Presence Uncertain
Sweden U Presence Uncertain
Switzerland U Presence Uncertain
Togo N Extant Yes
Trinidad and Tobago U Presence Uncertain
Turks and Caicos Islands (to UK) U Presence Uncertain
Uruguay N Extant Yes
USA N Extant Yes
Venezuela V Extant
Western Sahara N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Mauritania Canary current shelf-break South

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Caves and Subterranean Habitats (non-aquatic) Caves suitable breeding
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands major breeding
Marine Intertidal Rocky Shoreline major breeding
Marine Neritic Macroalgal/Kelp major breeding
Marine Neritic Macroalgal/Kelp suitable non-breeding
Marine Neritic Pelagic major breeding
Marine Neritic Pelagic major non-breeding
Marine Neritic Seagrass (Submerged) major breeding
Marine Neritic Seagrass (Submerged) suitable non-breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel major breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel suitable non-breeding
Marine Neritic Subtidal Rock and Rocky Reefs major breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable non-breeding
Marine Neritic Subtidal Sandy major breeding
Marine Neritic Subtidal Sandy suitable non-breeding
Marine Neritic Subtidal Sandy-Mud major breeding
Marine Neritic Subtidal Sandy-Mud suitable non-breeding
Marine Oceanic Epipelagic (0-200m) major breeding
Marine Oceanic Epipelagic (0-200m) major non-breeding
Marine Oceanic Mesopelagic (200-1000m) major breeding
Marine Oceanic Mesopelagic (200-1000m) major non-breeding
Rocky areas (eg. inland cliffs, mountain peaks) major breeding
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Fishing & harvesting aquatic resources - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Past, Unlikely to Return Minority (<50%) Causing/Could cause fluctuations Past Impact
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species - Felis catus Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Pollution Excess energy - Light pollution Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species mortality

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food - human - - Non-trivial Recent
Sport hunting/specimen collecting - - Non-trivial Recent

Recommended citation
BirdLife International (2017) Species factsheet: Calonectris borealis. Downloaded from http://www.birdlife.org on 11/12/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 11/12/2017.