Troglodytes troglodytes 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Troglodytidae

Scientific Name: Troglodytes troglodytes (Linnaeus, 1758)
Regional Assessments:
Common Name(s):
English Northern Wren
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., Khwaja, N. & Symes, A.
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). The population trend appears to be increasing, and hence the species does not 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.

Geographic Range [top]

Countries occurrence:
Afghanistan; Albania; Algeria; Andorra; Armenia; Austria; Azerbaijan; Belarus; Belgium; Bermuda; Bhutan; Bosnia and Herzegovina; Bulgaria; China; Croatia; Cyprus; Czech Republic; Denmark; Egypt; Estonia; Faroe Islands; Finland; France; Georgia; Germany; Gibraltar; Greece; Hungary; Iceland; India; Iran, Islamic Republic of; Iraq; Ireland; Israel; Italy; Japan; Jordan; Kazakhstan; Korea, Democratic People's Republic of; Korea, Republic of; Kyrgyzstan; Latvia; Lebanon; Libya; Liechtenstein; Lithuania; Luxembourg; Macedonia, the former Yugoslav Republic of; Malta; Moldova; Mongolia; Montenegro; Morocco; Myanmar; Nepal; Netherlands; Norway; Pakistan; Palestinian Territory, Occupied; Poland; Portugal; Romania; Russian Federation (Central Asian Russia, Eastern Asian Russia, European Russia); Saint Pierre and Miquelon; Serbia; Slovakia; Slovenia; Spain; Sweden; Switzerland; Syrian Arab Republic; Taiwan, Province of China; Tajikistan; Tunisia; Turkey; Turkmenistan; Ukraine; United Kingdom; Uzbekistan
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:50900000
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
Upper elevation limit (metres):4575
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In Europe, the breeding population is estimated to number 32,700,000-56,500,000 pairs, which equates to 65,300,000-113,000,000 mature individuals (BirdLife International 2015). National population estimates include: c.10,000-100,000 breeding pairs in China; c.100-100,000 breeding pairs in Taiwan; possibly c.10,000-100,000 breeding pairs in Korea; c.100-100,000 breeding pairs in Japan and possibly c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Russia (Brazil 2009). It is likely that the global population is within the range 10,000,000-500,000,000 mature individuals.

Trend Justification:  In Europe the overall trend from 1980-2013 was increasing (EBCC 2015).
Current Population Trend:Increasing
Additional data:
Number of mature individuals:215000000-379999999Continuing 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 inhabits a wide variety of habitats. In western Europe, it is most commonly found in deciduous and mixed woodland, well-vegetated suburbs, urban parks and gardens, moorland scrub, and offshore islands with very scanty cover. In North America it breeds primarily in boreal moist coniferous forest with extensive understorey, as well as on offshore islands with very stunted vegetation. In European Russia, egg-laying occurs from the second half of May; however in western Europe it begins late March or early April and a week or more later in central Europe. In Canada it breeds between May and July. The nest is a domed structure with a side entrance hole (Kroodsma et al. 2015) and is made of grass, leaves, moss and other vegetation, lined with feathers and hair (Snow and Perrins 1998). It is sited in a wide range of locations, often in dense vegetation but also in a cavity or crevice and will use artificial sites. Clutches can be three to nine eggs but most often five to eight. The diet is mostly invertebrates such as spiders (Araneae), beetles (Coleoptera), earwigs (Dermaptera) and orthopterans but it will also take small vertebrates, such as small fish, tadpoles and young frogs. The species is resident, migratory and partially migratory (Kroodsma et al. 2015).
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):3.5
Movement patterns:Full Migrant

Threats [top]

Major Threat(s): Some island populations, which represent whole subspecies are very small and thus vulnerable; the designation of race hirtensis, on St Kilda (Scotland) in 1884 led to an increase in collecting activity, although there is no evidence this caused a significant decline. In non-migratory populations, severe winters with prolonged snow cover can decimate numbers but this is normally temporary and recovery is quick (Kroodsma et al. 2015).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
Within Europe, the race fridariensis is listed on Annex I of the EU Birds Directive. Bern Convention Appendix II. There are currently no known conservation measures for this species within its European range.

Conservation Actions Proposed
No conservation measures are currently needed for this species within Europe.

Citation: BirdLife International. 2016. Troglodytes troglodytes. The IUCN Red List of Threatened Species 2016: e.T103883277A87784898. . Downloaded on 18 August 2018.
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