|Red List Category & Criteria:
||Butchart, S. & Symes, A.
||Butchart, S., Calvert, R., Ekstrom, J. & Newton, P.
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 extremely 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.
|Previously published Red List assessments:|
- 2009 – Least Concern (LC) –
- 2008 – Least Concern (LC) –
- 2004 – Least Concern (LC) –
- 2000 – Lower Risk/least concern (LR/lc) –
- 1994 – Lower Risk/least concern (LR/lc) –
- 1988 – Lower Risk/least concern (LR/lc) –
|Range Description:||The Manx Shearwater breeds in the north Atlantic, with major colonies on the Atlantic coasts of the United Kingdom and Ireland. Colonies are also present on Iceland, islets off Massachusetts (USA) and Newfoundland (Canada), as well as on the Azores, Portugal and the Canary Islands, Spain. It undegoes transequatorial migration, expanding the range in winter to include the Atlantic coast of South America below the equator and the south-west coast of South Africa1. |
Argentina; Bermuda; Brazil; Canada; Chile; Denmark; Falkland Islands (Malvinas); Faroe Islands; France; French Guiana; Guadeloupe; Iceland; Ireland; Liberia; Morocco; Namibia; Netherlands; Norway; Portugal; Puerto Rico; Saint Pierre and Miquelon; Senegal; South Africa; South Georgia and the South Sandwich Islands; Spain (Canary Is.); Trinidad and Tobago; United Kingdom; United States; Uruguay; Venezuela, Bolivarian Republic of; Western Sahara
Angola (Angola); Australia; Austria; Barbados; Belgium; Belize; Cape Verde; Costa Rica; Côte d'Ivoire; Cuba; Dominican Republic; Germany; Ghana; Greenland; Mauritania; New Zealand; Nigeria; Panama; Saint Vincent and the Grenadines; Sweden; Switzerland
Present - origin uncertain:
Gambia; Guinea; Guinea-Bissau; Saint Helena, Ascension and Tristan da Cunha; Sierra Leone
|♦ Continuing decline in area of occupancy (AOO):||Unknown|
|♦ Extreme fluctuations in area of occupancy (AOO):||No||♦ Estimated extent of occurrence (EOO) - km2:||53100000|
|♦ Continuing decline in extent of occurrence (EOO):||Unknown||♦ Extreme fluctuations in extent of occurrence (EOO):||No|
|♦ Continuing decline in number of locations:||Unknown|
|♦ Extreme fluctuations in the number of locations:||No|
|♦ Upper elevation limit (metres):||1000|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||In Europe (which covers >95% of the breeding range), the breeding population is estimated to be 350,000-390,000 breeding pairs, equating to 1,050,000-1,170,000 individuals (BirdLife International 2004). Brooke (2004) also estimated the global population to be at least 1,000,000 individuals.|
Trend Justification: The population trend is decreasing in North America (based on BBS/CBC data: Butcher and Niven 2007).
|Current Population Trend:||Decreasing|
|♦ Continuing decline of mature individuals:||Unknown|
|♦ Extreme fluctuations:||No||♦ Population severely fragmented:||No|
|♦ Continuing decline in subpopulations:||Unknown|
|♦ Extreme fluctuations in subpopulations:||No||♦ All individuals in one subpopulation:||No|