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Sylvia Nisoria

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Sylvia Nisoria Sylvia nisoria -- (Bechstein, 1795) ANIMALIA -- CHORDATA -- AVES -- PASSERIFORMES -- SYLVIIDAE Common names: Barred Warbler; European Barred Warbler; Fauvette épervière 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 is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds 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). The population trend is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds 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; Armenia; Austria; Azerbaijan; Belarus; Bosnia and Herzegovina; Bulgaria; Croatia; Cyprus; Czech Republic; Denmark; Faroe Islands (to DK); Estonia; Finland; Georgia; Germany; Greece; Hungary; Italy; Latvia; Lithuania; Macedonia, the former Yugoslav Republic of; Moldova; Montenegro; Norway; Poland; Romania; Russian Federation; Serbia; Slovakia; Slovenia; Sweden; Switzerland; Turkey; Ukraine; United Kingdom Vagrant: Belgium; France; Iceland; Ireland, Rep. of; Malta; Netherlands; Spain Population The European population is estimated at 506,000-968,000 pairs, which equates to 1,010,000-1,940,000 mature individuals. The population in the EU27 is estimated at 296,000-586,000 pairs, which equates to 593,000-1,170,000 mature individuals. For details of national estimates, see Supplementary PDF. Trend In Europe and the EU27 the population size trend is unknown. For details of national estimates, see Supplementary PDF. Habitats and Ecology This is a forest species but can occur in open woodland with variety of structured vegetation: woodland margins, dense thorny bushes, clearings with rich undergrowth, isolated tree stands, young plantations, riverine thickets, hedgerows at railsides and roadsides, pastures, meadows, parks and orchards. Breeding occurs from May to July. The nest is an open elaborate cup-shaped structure coated externally with spider webs and the silk of caterpillar cocoons. It is usually hidden in dense thorny bush such as Rubus, rose (Rosa) or hawthorn (Crataegus), occasionally in juniper (Juniperus), c. 30–200 cm above ground. Clutches are three to six eggs. The diet is mainly made up of insects during the breeding season but fruits become steadily more important once breeding has finished and just before and during migration. The species is migratory, wintering in east Africa (Aymí et al. 2015). Habitats & Altitude Habitat (level 1 - level 2) Importance Occurrence Artificial/Terrestrial - Pastureland suitable breeding Artificial/Terrestrial - Plantations suitable breeding Forest - Temperate major breeding Shrubland - Temperate suitable breeding Altitude max. 1600 m Occasional altitudinal limits Threats In eastern Germany, the intensification of agriculture, ploughing of grassland and disappearance of large areas of low-intensity pastures and unproductive grassland have driven habitat loss. Fluctuations of populations and range may have climatic causes, as the species does not tolerate damp, cool, early-summer weather. The disappearance of Lanius collurio may have also caused declines through the interdependence of both species (Hagemeijer and Blair 1997). Threats & Impacts Threat (level 1) Threat (level 2) Impact and Stresses Agriculture & Agro-industry Timing Scope Severity Impact aquaculture farming Ongoing Minority (<50%) Slow, Significant Low Impact Declines Stresses Ecosystem conversion; Ecosystem degradation Agriculture & Shifting agriculture Timing Scope Severity Impact aquaculture Ongoing Minority (<50%) Slow, Significant Low Impact Declines Stresses Ecosystem conversion; Ecosystem degradation Climate change & Temperature Timing Scope Severity Impact severe weather extremes Past, Likely to Majority (50-90%) Causing/Could Past Impact Return cause fluctuations Stresses Species mortality Invasive and other Red-backed Shrike Timing Scope Severity Impact problematic (Lanius collurio) Ongoing Minority (<50%) Unknown Unknown species, genes & diseases Stresses Loss of mutualism Conservation Conservation Actions Underway CMS Appendix II. Bern Convention Appendix II. EU Birds Directive Annex I There are currently no known conservation measures for this species. Conservation Actions Proposed Habitat management for this species should include extensive grazing as this keeps vegetation varied and well structured and thus suitable for this species (Aymí et al. 2015). Bibliography Aymí, R., Gargallo, G. and de Juana, E. 2015. Barred Warbler (Sylvia nisoria). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. and de Juana, E. (eds.) 2015. Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/58954 on 27 March 2015). Hagemeijer, W.J.M. and Blair, M.J. 1997. The EBCC Atlas of European Breeding Birds: Their Distribution and Abundance. T & A D Poyser, London. Map (see overleaf) .
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