Locustella fluviatilis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Locustellidae

Scientific Name: Locustella fluviatilis (Wolf, 1810)
Regional Assessments:
Common Name(s):
English River Warbler, Eurasian River Warbler
French Locustelle fluviatile
Taxonomic Source(s): Cramp, S. and Simmons, K.E.L. (eds). 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2017
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Butchart, S., Ekstrom, J., Symes, A., Ashpole, J
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:
Algeria; Austria; Azerbaijan; Belarus; Bosnia and Herzegovina; Bulgaria; Croatia; Czech Republic; Denmark; Egypt; Estonia; Ethiopia; Finland; Germany; Greece; Hungary; Iran, Islamic Republic of; Iraq; Israel; Jordan; Kazakhstan; Kenya; Kuwait; Latvia; Libya; Lithuania; Malawi; Moldova; Montenegro; Morocco; Poland; Romania; Russian Federation (Central Asian Russia, European Russia); Saudi Arabia; Serbia; Slovakia; Slovenia; South Africa; Sudan; Sweden; Syrian Arab Republic; Tanzania, United Republic of; Tunisia; Turkey; Ukraine; Zambia; Zimbabwe
Bahrain; Belgium; Botswana; Cyprus; France; Lebanon; Malta; Mozambique; Namibia; Netherlands; Norway; Oman; Portugal; Somalia; Spain; Svalbard and Jan Mayen; Switzerland; Uganda; United Arab Emirates; United Kingdom; Yemen
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:1570000
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:In Europe, the breeding population is estimated to number 2,330,000-5,360,000 pairs, which equates to 4,650,000-10,700,000 mature individuals (BirdLife International 2015). Europe forms c.80% of the global range, so a very preliminary estimate of the global population size is 5,800,000-13,400,000 mature individuals, although further validation of this estimate is needed.

Trend Justification:  In Europe the overall trend from 1982-2013 was decreasing (EBCC 2015).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:5000000-13999999Continuing 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 this species is found in dense low vegetation, grass thickets, nettles (Urtica) and tangled herbage in meadows, moist woodland, damp forest clearings and sedge marshes. It also uses riverbanks and abandoned cultivation. In the African non-breeding quarters the species uses dense green bush and scrub, rank herbage, tall grass and woodland undergrowth. Egg laying begins from end of May and continues to mid-July in east Europe. The nest is a loose cup of grass stems and leaves, lined with finer grasses and hair. It is built in thick vegetation or at the base of a bush, on or very close to the ground and commonly has an approach “run” or corridor. Clutches are typically four to six eggs. It feeds mainly on insects but also takes spiders (Araneae), small ticks (Acarina), millipedes (Diplopoda) and small molluscs. The species is a long-distance migrant, wintering in eastern and southern Africa (Pearson 2006).
Systems:Terrestrial; Freshwater
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):3.7
Movement patterns:Full 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
CMS Appendix II. Bern Convention Appendix II. There are currently no known conservation measures for this species within Europe.

Conservation Actions Proposed

Research to identify causes of population declines and appropriate conservation measures.

Amended [top]

Amended reason: Map revised.

Citation: BirdLife International. 2017. Locustella fluviatilis (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T22714679A111075343. . Downloaded on 26 May 2018.
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