Calonectris diomedea 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Procellariiformes Procellariidae

Scientific Name: Calonectris diomedea (Scopoli, 1769)
Regional Assessments:
Common Name(s):
English Scopoli's Shearwater
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.
Taxonomic Notes: 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).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2017
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Butchart, S., Calvert, R., Ekstrom, J., Newton, P., Symes, A., Taylor, J. & Ashpole, J
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.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species breeds in Algeria, Croatia, France, Greece, Italy, Malta, Spain (excluding the Canary Islands), Tunisia and Turkey (Derhé 2012). The majority of the population spends the non-breeding season in the Atlantic, including areas off the west coast of Africa and east coast of Brazil (Péron et al. 2012). The global population is thought to be in slow decline overall, although more research is required (Derhé 2012, Carboneras et al. 2013).
Countries occurrence:
Albania; Algeria; Angola; Benin; Bosnia and Herzegovina; Cameroon; Cape Verde; Congo; Congo, The Democratic Republic of the; Côte d'Ivoire; Croatia; Cyprus; Egypt; Equatorial Guinea; France; Gabon; Gambia; Ghana; Gibraltar; Greece; Guinea; Guinea-Bissau; Israel; Italy; Lebanon; Liberia; Libya; Malta; Mauritania; Monaco; Morocco; Namibia; Nigeria; Palestinian Territory, Occupied; Portugal; Saint Helena, Ascension and Tristan da Cunha; Sao Tomé and Principe; Senegal; Sierra Leone; Slovenia; South Africa; Spain (Canary Is.); Syrian Arab Republic; Togo; Tunisia; Turkey; Western Sahara
Austria; Bulgaria; Iran, Islamic Republic of; Montenegro; Oman; Serbia
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:74300000
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The most recent assessment of the European population provided an estimate of 30,500-48,100 pairs, equating to 61,000-96,000 mature individuals (BirdLife International 2015). The population on Zembra Island, Tunisia is estimated at 113,720-176,750 pairs (Defos du Rau et al. 2012). The overall population has been estimated at 142,478-222,886 pairs (Derhé 2012, Carboneras et al. 2013), assumed here to be equivalent to c.285,000-446,000 mature individuals. This estimate follows recent surveys of the largest colony on Zembra Island, Tunisia, which resulted in an alternative revised estimate for the total breeding population of 179,000-193,000 pairs (Defos du Rau et al. 2012).

Trend Justification:  The overall population trend is estimated to be declining. The species’s population is estimated and projected to be declining by c. 2% over three generations (1980-2038), although this is based on data from only 6% of the population (Derhé 2012, Carboneras et al. 2013). The European population is estimated to be declining by less than 25% in three generations (BirdLife International 2015). Estimates of adult survival and breeding probabilities in Tunisia are required to fully estimate the global population trend (Carboneras et al. 2013).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:285000-446000Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

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). 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
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):19.3
Movement patterns:Full Migrant
Congregatory:Congregatory (and dispersive)

Threats [top]

Major Threat(s): The main threats to the species include the impacts of invasive, non-native mammals and mortality from fisheries bycatch (Derhé 2012, Carboneras et al. 2013).  Recent studies have highlighted the pressures imposed by introduced mammal species, and colonies have shown marked increases in breeding success during mammal control measures (e.g. Igual et al. 2006, Pascal et al. 2008).  It is one of the most frequent seabird species to occur in bycatch in the Mediterranean (Valeiras and Caminas 2003, García-Barcelona et al. 2010, Laneri et al. 2010), with estimates of the number of individuals killed annually by Spanish fleets ranging from 200 (García-Barcelona et al. 2010) to 467-1,867 (estimated 4-6% of the local breeding population; Belda and Sanchez 2001).  It is the main seabird species caught as bycatch by the Spanish long-line fleet in the western Mediterranean (Báez et al. 2014).  Results from a questionnaire suggest an annual bycatch of up to 1,220 individuals by Maltese fleets (8.5-10% of the breeding population), although this is likely to be an over-estimate skewed by high bycatch in a small number of vessels (Dimech et al. unpubl. per Derhé 2012).  The species may also suffer significant bycatch in its non-breeding range (e.g. Granadeiro et al. 2006).  Light pollution has been identified as a further threat (Rodríguez et al. 2015).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
EU Birds Directive Annex I. Bern Convention Appendix II. The following information refers to the species's European range only: In most areas human exploitation has ceased or is only occasional and some breeding islands have been declared reserves. Feasibility of eradicating Rattus rattus from Italian islands with breeding seabirds has been evaluated, but would apparently be of much greater benefit to Puffinus yelkouan than the present species, while an intensive rat-control programme was successfully initiated at two subcolonies on Chafarinas Is. (Spain) in 1999-2004 (Carboneras et al. 2014). In addition, censuses, monitoring, creation of protected areas and studies of the species's biology and ecology have all taken place. At colonies mammal control, provision of artificial nest sites and management to reduce disturbance have also been implemented (Anselme and Durand 2012).

Conservation Actions Proposed
The following information refers to the species's European range only: Rat control programmes appear to deliver only a small increase in the population growth rate whereas change in adult survival has a much larger impact. Therefore increasing adult survival is of greater importance and rat eradication programmes can only be used to 'buy' time (Igual et al. 2009). Further research and monitoring is required and the continuation of measures to reduce disturbance. Actions to reduce the impact of L. michahellis where appropriate should be implemented. An international network with the aim to prioritize conservation actions and monitoring programmes should be developed. Mortality in longline fishing should be monitored and measures such as setting longlines only at certain times of the day to reduce the accidental catch should be followed (Belda and Sanchez 2001).

Amended [top]

Amended reason: Map revised.

Citation: BirdLife International. 2017. Calonectris diomedea (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T45061132A111157821. . Downloaded on 15 August 2018.
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