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Loxia leucoptera 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Fringillidae

Scientific Name: Loxia leucoptera
Species Authority: Gmelin, 1789
Regional Assessments:
Common Name(s):
English Two-barred Crossbill, White-winged Crossbill
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

Assessment Information [top]

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

Geographic Range [top]

Countries occurrence:
Native:
Bermuda; Canada; China; Czech Republic; Denmark; Estonia; Finland; Japan; Korea, Republic of; Latvia; Lithuania; Mongolia; Norway; Russian Federation; Saint Pierre and Miquelon; Slovakia; Sweden; United States
Vagrant:
Austria; Belarus; Belgium; Bulgaria; Faroe Islands; France; Germany; Greenland; Hungary; Ireland; Jamaica; Kazakhstan; Montenegro; Netherlands; Poland; Romania; Serbia (Serbia); Slovenia; Spain; Switzerland; Ukraine; United Kingdom
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:47700000
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 European population is estimated at 1,500,000-4,260,000 pairs, which equates to 3,000,000-8,510,000 mature individuals (BirdLife International 2015). Europe forms approximately 10% of the global range, so a very preliminary estimate of the global population size is 30,000,000-85,100,000 mature individuals, although further validation of this estimate is needed.

Trend Justification:  This species has undergone a large and statistically significant decrease over the last 40 years in North America (-67.8% decline over 40 years, equating to a -24.7% decline per decade; data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007). The European population size is estimated to be fluctuating (BirdLife International 2015).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:10000000-99999999Continuing decline of mature individuals:Unknown
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:This species occupies dense conifer forests and plantations, mainly larch and larch-pine (Larix-Pinus) forests. It is found predominantly with Siberian pine (Pinus sibirica) in central Siberia and also uses fir (Abies) and spruce (Picea), and occasionally resorts to deciduous trees in absence of preferred conifers. In eastern Russia it is mostly found in larches and mainly in spruce and in north-west Russia and Scandinavia mostly in spruce (Clement 2016). The breeding season is from February to mid-May in years of a good seed crop of pine and spruce, but in poor crop years it is delayed to from June to August (Snow and Perrins 1998). It breeds from January to August in North America with timing largely determined by availability of seed crop (Clement 2016). The nest is constructed mostly of conifer twigs, plant stalks, grass stems, lichens, moss, plant fibres and down, animal hair or fur and feathers. It is set 2–20 m above ground against the trunk of a conifer, typically spruce. On occasion it is placed at the end of a branch. Clutches are three to four eggs. The diet consists mainly of conifer seeds, buds, berries and shoots, chiefly of larch and spruce but it also takes a range of invertebrates and larvae (Clement 2016). The species is resident and dispersive but also irruptive in years of poor seed crops (Snow and Perrins 1998).
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):3.4
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): There are not thought to be any current significant threats to this species.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
Bern Convention Appendix II.

Conservation Actions Proposed
No conservation measures are currently needed for this species within its European range.

Citation: BirdLife International. 2016. Loxia leucoptera. The IUCN Red List of Threatened Species 2016: e.T22728944A88698387. . Downloaded on 26 February 2017.
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