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Calonectris diomedea

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AVES PROCELLARIIFORMES PROCELLARIIDAE

Scientific Name: Calonectris diomedea
Species Authority: (Scopoli, 1769)
Common Name/s:
English – Cory's Shearwater
Taxonomic Notes: Calonectris diomedea (Sibley and Monroe 1990, 1993) has been split into C. diomedea and C. edwardsii following Hazevoet (1995), contra Brooke (2004). Calonectris diomedea (Hazevoet 1995) was split by Sangster et al. (1998) into C. diomedea and C. borealis. However, this treatment is not followed by the BirdLife International Taxonomic Working Group because morphological and genetic differences between the two taxa are slight, similarly large divisions exist within diomedea as between diomedea and borealis and qualitative differences in voice do not necessarily amount to isolating mechanisms.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2012
Assessor/s: BirdLife International
Reviewer/s: Butchart, S. & Symes, A.
Contributor/s:
Justification:
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
History:
2009 – Least Concern
2008 – Least Concern
2004 – Least Concern
1994 – Not Recognized
1988 – Not Recognized

Geographic Range [top]

Range Description: Cory's Shearwater breeds on islands and cliffs in the Mediterranean, as well as having outposts in the Atlantic at the Canary Islands (Spain), Berlengas Islands and the Azores (Portugal). After breeding, birds from the Atlantic colonies predominantly winter off the coast of South America and southern Africa, with some individuals from the Mediterranean wintering in the area of the Canary current (Navarro and González-Solís 2009).
Countries:
Native:
Albania; Algeria; Antigua and Barbuda; Argentina; Bahamas; Barbados; Bermuda; Brazil; Canada; Cape Verde; Côte d'Ivoire; Croatia; Cuba; Cyprus; Dominica; Egypt; Falkland Islands (Malvinas); France; French Guiana; French Southern Territories (the); Gibraltar; Greece; Guyana; Ireland; Israel; Italy; Jordan; Lebanon; Liberia; Libya; Macedonia, the former Yugoslav Republic of; Madagascar; Malta; Martinique; Mauritania; Mexico; Montserrat; Morocco; Mozambique; Namibia; Palestinian Territory, Occupied; Portugal; Puerto Rico; Saint Kitts and Nevis; Saint Lucia; Saint Vincent and the Grenadines; Senegal; Sierra Leone; South Africa; South Georgia and the South Sandwich Islands; Spain (Canary Is.); Spain (Canary Is.); Trinidad and Tobago; Tunisia; Turkey; Turks and Caicos Islands; United Kingdom; United States; Uruguay; Western Sahara
Vagrant:
Austria; Belgium; Bulgaria; Costa Rica; Czech Republic; Denmark; Faroe Islands; Germany; Ghana; Guadeloupe; Iran, Islamic Republic of; Montenegro; Netherlands; New Zealand; Norway; Oman; Panama; Poland; Saint Helena, Ascension and Tristan da Cunha; Saint Pierre and Miquelon; Serbia (Serbia); Sweden; Switzerland; Venezuela
Present - origin uncertain:
Angola (Angola); Benin; Bosnia and Herzegovina; Cameroon; Congo; Congo, The Democratic Republic of the; Equatorial Guinea; Gabon; Gambia; Guinea; Guinea-Bissau; Monaco; Nigeria; Sao Tomé and Principe; Slovenia; Suriname; Syrian Arab Republic; Togo
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: In Europe, the breeding population is estimated to number 270,000-290,000 breeding pairs, equating to 810,000-870,000 individuals (BirdLife International 2004). Europe forms 75-94% of the global range, so a very preliminary estimate of the global population size is 900,000-1,200,000 individuals. Brooke (2004) estimated the global population to number at least 600,000 individuals.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: Pelagic movements are easily divided into frequent foraging trips around the breeding areas, rapid, long-distance migrations, and smaller-scale movements within a well defined wintering ground (González-Solís et al. 2007). Breeding starts in April on barren offshore islands, occupying cliffs, caves and boulder fields (del Hoyo et al. 1992). Breeding individuals in the Canary Islands show a unimodel foraging strategy, concentrating on highly productive regions of the African continental shelf (Navarro and González-Solís 2009). Diet is mostly squid, which are obtained mainly by surface-seizing. It is regularly attracted to trawlers to feed on offal (del Hoyo et al. 1992).
Systems: Terrestrial; Marine
Citation: BirdLife International 2012. Calonectris diomedea. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 21 May 2013.
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