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LC
Eurasian Reed-warbler Acrocephalus scirpaceus

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.

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls.
Dowsett, R. J.; Forbes-Watson, A. D. 1993. Checklist of birds of the Afrotropical and Malagasy regions. Tauraco Press, Li

Taxonomic note
Acrocephalus scirpaceus and A. baeticatus (Sibley and Monroe 1990, 1993) have been lumped into A. scirpaceus following Dowsett and Forbes-Watson (1993).

Population justification
In Europe, the breeding population is estimated to number 2700000-5000000 breeding pairs, equating to 8100000-15000000 individuals (BirdLife International 2004). Europe forms 50-74% of the global range, so a very preliminary estimate of the global population size is 10900000-30000000 individuals, although further validation of this estimate is needed.

Trend justification
In Europe, trends since 1980 show that populations have undergone a moderate decline (p<0.01), based on provisional data for 21 countries from the Pan-European Common Bird Monitoring Scheme (EBCC/RSPB/BirdLife/Statistics Netherlands; P. Vorisek in litt. 2008).

References
Bergmann, F. 1999. Long-term increase in numbers of early-fledged Reed Warblers (Acrocephalus scirpaceus) at Lake Constance (Southern Germany). Journal für Ornithologie 140: 81-86.

Crick, H. Q. P.; Sparks, T.H. 1999. Climate change related to egg-laying trends. Nature 399: 423-424.

Halupka, L.; Dyrcz, A.; Borowiec, M. 2008. Climate change affects breeding of Reed Warblers Acrocephalus scirpaceus. Journal of Avian Biology 39: 95-100.

Hüppop, O.; Hüppop, K. 2003. North Atlantic Oscillation and timing of spring migration in birds. Proceedings of the Royal Society of London Series B 270: 233-240.

Jenni, L.; Kery, M. 2003. Timing of autumn bird migration under climate change: advances in long-distance migrants, delays in short-distance migrants. Proceedings of the Royal Society of London Series B 270(1523): 1467-1471.

Jonzén, N.; Lindén, A.; Ergon, T.; Knudsen, E.; Vik, J. O.,;Rubolini, D.; Piacentini, D.; Brinch, C.; Spina, F.; Karlsson, L.; Stervander, M.; Andersson, A.; Waldenström, J.; Lehikoinen, A.; Edvardsen, E.; Solvang, R.; Stenseth, N. C. 2006. Rapid advance of spring arrival dates in long-distance migratory birds. Science 312(5782): 1959-1961.

Mezquida, E.T.; Villaran, A.; Pascual-Parra, J. 2007. Timing of autumn bird migration in central Spain in light of recent climate change. Ardeola 54: 251-259.

Schaefer, T.; Ledebur, G.; Beier, J.; Leisler, B. 2006. Reproductive responses of two related coexisting songbird species to environmental changes: global warming, competition, and population sizes. Journal of Ornithology 147(1): 47-56.

Sparks, T. H.; Huber, K.; Bland, R. L.; Crick, H. Q. P.; Croxton, P. J.; Flood, J.; Loxton, R. G.; Mason, C. F.; Newnham, J.A.; Tryjanowski, P. 2007. How consistent are trends in arrival (and departure) dates of migrant birds in the UK? Journal of Ornithology 148: 503-511.

Stervander, M.; Lindström, A.; Jonzén, N.; Andersson, A. 2005. Timing of spring migration in birds: long-term trends, North Atlantic Oscillation and the significance of different migration routes. Journal of Avian Biology 36: 210-221.

Tøttrup, A. P.; Thorup, K.; Rahbek, C. 2006. Patterns of change in timing of spring migration in North European songbird populations. Journal of Avian Biology 37: 84-92.

Further web sources of information
Detailed species account from Birds in Europe: population estimates, trends and conservation status (BirdLife International 2004)

Text account compilers
Ekstrom, J., Butchart, S.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Acrocephalus scirpaceus. Downloaded from http://www.birdlife.org on 22/07/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/07/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Eurasian reed-warbler (Acrocephalus scirpaceus) 0

Key facts
Current IUCN Red List category Least Concern
Family Sylviidae (Old World warblers)
Species name author (Hermann, 1804)
Population size 10000000-30000000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 13,900,000 km2
Country endemic? No
Links to further information
- Additional Information on this species