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Troglodytes Troglodytes Troglodytes troglodytes -- (Linnaeus, 1758) ANIMALIA -- CHORDATA -- AVES -- PASSERIFORMES -- TROGLODYTIDAE Common names: Winter Wren; Wren European Red List Assessment European Red List Status LC -- Least Concern, (IUCN version 3.1) Assessment Information Year published: 2015 Date assessed: 2015-03-31 Assessor(s): BirdLife International Reviewer(s): Symes, A. Compiler(s): Ashpole, J., Burfield, I., Ieronymidou, C., Pople, R., Wheatley, H. & Wright, L. Assessment Rationale European regional assessment: Least Concern (LC) EU27 regional assessment: Least Concern (LC) In Europe this species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence 10% in ten years or three generations, or with a specified population structure). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (30% decline over ten years or three generations). For these reasons the species is evaluated as Least Concern in Europe. Within the EU27 this species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence 10% in ten years or three generations, or with a specified population structure). 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). For these reasons the species is evaluated as Least Concern in the EU27. Occurrence Countries/Territories of Occurrence Native: Albania; Andorra; Armenia; Austria; Azerbaijan; Belarus; Belgium; Bosnia and Herzegovina; Bulgaria; Croatia; Cyprus; Czech Republic; Denmark; Faroe Islands (to DK); Estonia; Finland; France; Georgia; Germany; Greece; Hungary; Iceland; Ireland, Rep. of; Italy; Latvia; Liechtenstein; Lithuania; Luxembourg; Macedonia, the former Yugoslav Republic of; Malta; Moldova; Montenegro; Netherlands; Norway; Poland; Portugal; Romania; Russian Federation; Serbia; Slovakia; Slovenia; Spain; Sweden; Switzerland; Turkey; Ukraine; United Kingdom; Gibraltar (to UK) Population The European population is estimated at 32,700,000-56,500,000 pairs, which equates to 65,300,000-113,000,000 mature individuals. The population in the EU27 is estimated at 27,800,000-48,000,000 pairs, which equates to 55,600,000-96,100,000 mature individuals. For details of national estimates, see Supplementary PDF. Trend In Europe the population size is estimated to be stable. In the EU27 the population size is estimated to be decreasing by less than 25% in 10.5 years (three generations). For details of national estimates, see Supplementary PDF. Habitats 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 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. The nest is a domed structure with a side entrance hole (Kroodsma et al. 2013) 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. 2013). Habitats & Altitude Habitat (level 1 - level 2) Importance Occurrence Artificial/Terrestrial - Rural Gardens suitable breeding Artificial/Terrestrial - Rural Gardens suitable non-breeding Artificial/Terrestrial - Urban Areas suitable breeding Artificial/Terrestrial - Urban Areas suitable non-breeding Forest - Boreal major breeding Forest - Temperate major breeding Forest - Temperate major non-breeding Shrubland - Boreal suitable breeding Shrubland - Boreal suitable non-breeding Shrubland - Temperate suitable breeding Shrubland - Temperate suitable non-breeding Altitude max. 2000 m Occasional altitudinal limits Threats 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. 2013). Threats & Impacts Threat (level 1) Threat (level 2) Impact and Stresses Biological resource Hunting & trapping Timing Scope Severity Impact use terrestrial animals Past, Unlikely to Minority (<50%) Negligible declines Past Impact (intentional use - Return species is the target) Stresses Species mortality Climate change & Temperature Timing Scope Severity Impact severe weather extremes Past, Likely to Minority (<50%) Causing/Could Past Impact Return cause fluctuations Stresses Species mortality Conservation Conservation Actions Underway 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. Conservation Actions Proposed No conservation measures are currently needed for this species. Bibliography Kroodsma, D., Brewer, D., Christie, D.A. & Bonan, A. 2013. Northern Wren (Troglodytes troglodytes). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. and de Juana, E. (eds.) 2013. Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/58150 on 28 March 2015). Map (see overleaf) .
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