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Sylvia borin 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Sylviidae

Scientific Name: Sylvia borin
Species Authority: (Boddaert, 1783)
Regional Assessments:
Common Name(s):
English Garden Warbler
French Fauvette des jardins
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:
Albania; Algeria; Andorra; Angola (Angola); Armenia (Armenia); Austria; Azerbaijan; Bahrain; Belarus; Belgium; Bosnia and Herzegovina; Botswana; Bulgaria; Burkina Faso; Burundi; Cameroon; Central African Republic; Chad; Congo; Congo, The Democratic Republic of the; Côte d'Ivoire; Croatia; Cyprus; Czech Republic; Denmark; Egypt; Equatorial Guinea; Eritrea; Estonia; Ethiopia; Faroe Islands; Finland; France; Gabon; Gambia; Georgia; Germany; Ghana; Greece; Guinea; Guinea-Bissau; Hungary; Iran, Islamic Republic of; Iraq; Ireland; Israel; Italy; Jordan; Kazakhstan; Kenya; Kuwait; Kyrgyzstan; Latvia; Lebanon; Liberia; Libya; Liechtenstein; Lithuania; Luxembourg; Macedonia, the former Yugoslav Republic of; Malawi; Mali; Malta; Mauritania; Moldova; Montenegro; Morocco; Mozambique; Namibia; Netherlands; Niger; Nigeria; Norway; Oman; Palestinian Territory, Occupied; Poland; Portugal; Romania; Russian Federation; Rwanda; Saudi Arabia; Senegal; Serbia (Serbia); Sierra Leone; Slovakia; Slovenia; South Africa; South Sudan; Spain (Canary Is.); Sudan; Swaziland; Sweden; Switzerland; Syrian Arab Republic; Tanzania, United Republic of; Togo; Tunisia; Turkey; Turkmenistan; Uganda; Ukraine; United Arab Emirates; United Kingdom; Uzbekistan; Western Sahara; Zambia; Zimbabwe
Vagrant:
Afghanistan; Djibouti; Iceland; Sao Tomé and Principe; Somalia; Svalbard and Jan Mayen; Yemen
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:14700000
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):2300
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Shirihai et al. (2001) estimated the population to exceed 10 million individuals, but in Europe, the breeding population is estimated to number 16,700,000-26,900,000 pairs, which equates to 33,300,000-53,800,000 mature individuals (BirdLife International 2015). Europe forms c.80% of the global range, so a very preliminary estimate of the global population size is 41,625,000-67,250,000 mature individuals, although further validation of this estimate is needed.

Trend Justification:  In Europe, trends between 1980 and 2013 show that populations have undergone a moderate decline (EBCC 2015).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:41000000-67999999Continuing 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:During the breeding season it inhabits dense bushes, woodland fringes and riparian forest with abundant undergrowth. It favours shady zones with herbaceous vegetation and broadleaf scrub and also often bushes close to reedbeds. In the Alps it occurs in stands of green alder (Alnus viridis) and birch (Betula) and various willows (Salix). In central Europe it prefers the presence of hawthorn (Crataegus monogyna) and blackthorn (Prunus spinosa), and in Finland is associated with raspberry (Rubus idaeus). In Britain it is abundant in areas of sessile oak (Quercus petraea). In its African non-breeding range it uses woods, forest edge, orchards and gardens, sometimes entering forest when fruits are available. It also occupies savanna and dry zones with dense thicket vegetation, e.g. acacia (Acacia) and brachystegia (Brachystegia) woodlands. It avoids closed forest, but can enter open montane forest at up to 2,600 m, although it prefers lower altitudes. Breeding occurs from April to July. The nest is a cup constructed from plant material such as grass, leaves and roots and lined with fine grass and hairs. It is usually placed low down, hidden in tree or bush or among tall plants. Clutches are four or five eggs. The diet is  mostly insects throughout the year, especially during the breeding season, when some fruits and plant material are also taken. Through the rest of the year it is mostly frugivorous. The species is a long-distance migrant (Aymí and Gargallo 2015).
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):4
Movement patterns:Full Migrant

Threats [top]

Major Threat(s): The spread of exotic Reynoutria spp. has been shown to reduce numbers of this species where it occurs (Hajzlerová and Reif 2014). Alterations or fragmentation of important refuelling habitats south of the Sahara could reduce survival (Aymí and Gargallo 2015).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CMS Appendix II. Bern Convention Appendix II. There are currently no known conservation measures for this species within Europe.

Conservation Actions Proposed
In areas where it is a problem, management actions should be developed that counter-act the invasion of Reynoutria spp. (Hajzlerová and Reif 2014).

Citation: BirdLife International. 2016. Sylvia borin. The IUCN Red List of Threatened Species 2016: e.T22716906A87687042. . Downloaded on 23 March 2017.
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