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Trends of common birds in Europe, 2014 update

This report presents an updated population trends and indices of 163 common European bird species for the time period 1980 - 2012 that have been produced by the Pan-European Common Bird Monitoring Scheme (PECBMS) in 2014. This year we modified the presentation of species trends: newly, we present long-term trends (trends for long time period) and ten-year trends (trends for last ten years).

Acknowledgements

Above all, we thank many skilled volunteer counters who have been collecting species count data year by year in the field.

Special thanks go to the data providers & organisations that are responsible for national data collection and analysis, and provide us with valuable advises and various support (listed alphabetically by countries and surnames):
Norbert Teufelbauer (Austria), Jean-Paul Jacob, Thierry Kinet, Jean-Yves Paquet, Christian Vansteenwegen, Anne Weiserbs (Belgium), Iordan Hristov (Bulgaria), Martin Hellicar, Derek Pomeroy (Cyprus), Tomáą Telenský, Zdeněk Vermouzek (Czech Republic), Nathia Brandtberg, Henning Heldbjerg, Michael Fink Jørgensen (Denmark), Jaanus Elts, Andres Kuresoo, Renno Nellis, Hannes Pehlak (Estonia), Aleksi Lehikoinen, Risto A. Väisänen (Finland), Diane Gonzalez, Frédéric Jiguet (France), Martin Flade, Christoph Grüneberg, Johannes Schwarz, Sven Trautmann (Germany), Theodoros Kominos, Aris Manolopoulos, Danae Portolou (Greece), Zoltán Görögh, Károly Nagy, Zsolt Nagy, Tibor Szép (Hungary), Dick Coombes, Olivia Crowe (Ireland), Gianpiero Calvi, Tommaso Campedelli, Lorenzo Fornasari, Patrizia Rossi (Italy), Ainārs Auniņą, Oskars Keiąs, Ieva Mārdega (Latvia), Gilles Biver (Luxembourg), Arjan Boele, Joost van Bruggen, Kees Koffijberg, Calijn Plate, Wolf Teunissen, Chris van Turnhout, Jan-Willem Vergeer (Netherlands), Magne Husby, John Atle Kålås, Roald Vang (Norway), Tomasz Chodkiewicz, Przemysław Chylarecki, Grzegorz Neubauer (Poland), Julieta Costa, Isabel Fagundes, Ana Leal, Domingos Leitão, Ricardo Martins, Ana Teresa Marques, Ana Meirinho, Hugo Sampaio (Portugal), Cristian Domşa, Ede Gábos, Zoltán D. Szabó (Romania), Jozef Ridzoň, Katarína Slabeyová, Ján Topercer (Slovakia), Luka Boľič, Jernej Figelj, Primoľ Kmecl (Slovenia), Marc Anton, Virginia Escandell, Emilio Escudero, Sergi Herrando, Juan Carlos del Moral (Spain), Martin Green, Åke Lindström (Sweden), Thomas Sattler, Hans Schmid, Martin Spiess (Switzerland), Dario Massimino, David G. Noble, Kate Risely (United Kingdom).

We are very grateful to Arco van Strien, Adriaan Gmelig Meyling and Thomas van der Meij (all from Statistics Netherlands) who contributed with final data analysis and computation procedure, and to Tomáą Telenský who helped very much with this web presentation.

We thank members of the PECBMS Steering and Technical Group - Richard D. Gregory (RSPB), Arco Van Strien (Statistics Netherlands), Ruud P.B. Foppen (SOVON), David G. Noble (BTO), Ian J. Burfield (Birdlife International), and Zdeněk Vermouzek (CSO) - for valuable comments and help with data collation and analysis.

We thank also to Norbert Schäffer and David W. Gibbons for general support of the project.

Pan-European Common Bird Monitoring Scheme is a joint initiative of the European Bird Census Council (EBCC) and BirdLife International. Since its beginning in 2002, the PECBMS project has been supported by the the Royal Society for the Protection of Birds (RSPB, the BirdLife International Partner in the UK). Since January 2006 the project has been funded by the European Commission as well.

     


Other important partners of the project are: Statistics Netherlands, Czech Society for Ornithology (CSO, BirdLife Partner in the Czech Republic), British Trust for Ornithology (BTO), Dutch Organisation for Field Ornithology (SOVON), and others.

Data

In 2014, reliable European index was produced on 163 species.

Altogether 27 countries provided the data this year: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Luxembourg, The Netherlands, Norway, Poland, Portugal, Romania, Slovenia, Slovakia, Spain, Sweden, Switzerland, United Kingdom.

The countries provided the data for different time periods, see Methods, chapter 2. Supranational species indices and trends or check the ´List of countries´ at the individual species graphs.

New development and improvement in computation techniques allowed us to use data from multiple schemes within one country which is the case for data from Belgium, Cyprus, France, Germany, Latvia, Netherlands, Norway, Spain, Sweden. In addition, data from several special monitoring schemes are included as well: Wetland Species Monitoring in Poland (covers period 2007 - 2012), Rare Breeding Bird Survey in Germany (covers various periods from 1980), or Waterways Bird Survey (1974-2007) and Waterways Breeding Bird Survey (1998-2012) in United Kingdom.

Methods

Detailed description of computation steps and methods is available in special section Methods, in chapter 1. National species indices and trends and chapter 2. Supranational species indices and trends.

Species habitat classification for main habitat types (farmland, forest and other) is described in Methods, chapter 3, Box Species selection and classification.

Results

Compared to the last year, we newly modified the presentation of species trends and we present new long-term and ten-year trends and slopes. Contrary to the former Long-term Slope, the new Long-term Slope is calculated over the period 1980-2012 but starting years of this long time period vary from 1980 to 1998 (as specified in the Species notes below the table of trends). In parallel, the new Long-term Trend is replacing the former Trend 1980 (´long-term trend´) and represents a change (in %) in an index value between the first and the last year of this long time period. The new Ten-year Slope is replacing the former Short-term Slope and is calculated over the period of last ten years, i.e. 2003-2012. Similarly, the new Ten-year Trend is replacing the former Trend 1990 (´short-term trend´) and represents a change (in %) in an index value between the first and the last year of the period of last ten years.

Updated European species indices, long-term and ten-year trends and slopes, and species habitat classification are summarized in the table below. For explanations to the table see also the Explanations below the table.

To generate the graph of a species index, click the species name in the table. To generate graphs for several species at once, tick the check boxes at left side of species names and press ENTER or click Show graphs for selected species button below the table to confirm and proceed your selection. You can also draw graphs for all species at once (Select all) or quickly deselect your choice (Reset). The list of countries and time periods for which the countreis provided the data can be found at individual species graphs (List of countries). You can choose to order species trends by alphabet or by taxonomic classification, see by alphabet | by taxonomy buttons in the head of the table.

For comparison, check the previous version of species trends produced for the time period 1980 - 2011.

Note: We recommend cautious interpretation of year by year changes in the indicators values and readers should also pay attention to lists of species and countries. For any use of the results presented in this report, we strongly recommend to consult PECBMS coordination unit (EuroMonitoringbirdlife.cz).





Species scientific and common names as well as species taxonomic order follow the BirdLife Checklist, Version 6 (BirdLife International 2013).

Explanations

Species notes:
1) Data for Long-term Trend and Long-term Slope not available.
2) Data for Long-term Trend and Long-term Slope available over the period 1981-2012.
3) Data for Long-term Trend and Long-term Slope available over the period 1982-2012.
4) Data for Long-term Trend and Long-term Slope available over the period 1984-2012.
5) Data for Long-term Trend and Long-term Slope available over the period 1988-2012.
6) Data for Long-term Trend and Long-term Slope available over the period 1989-2012.
7) Data for Long-term Trend and Long-term Slope available over the period 1990-2012.
8) Data for Long-term Trend and Long-term Slope available over the period 1991-2012.
9) Data for Long-term Trend and Long-term Slope available over the period 1996-2012.
10) Data for Long-term Trend and Long-term Slope available over the period 1998-2012.

a) Long-term Trend (%) and Ten-year Trend (%) - change (in %) in an index value between the first and the last year of a time period. Long-term Trend (%) is calculated over the period 1980-2012, unless specified differently in the Species notes below the table. Ten-year Trend (%) is calculated over the period of last ten years (2003-2012).

b) Slope - multiplicative trend over a time period considered, reflects average percentage change per year. If the slope value is 1, there is no trend. If > 1, there is a positive trend, if < 1, trend is negative. For instance, 1.08 means 8 % increase per year, 0.93 means 7 % decline per year. Slope standard errors (SE) are in parenthesis. Long-term Slope is calculated over the period 1980-2012, unless specified differently in the Species notes below the table. Ten-year Slope is calculated over the period of last ten years (2003-2012).

c) Habitat
for - forest
farm - farmland
oth - other

Contact

Project coordinator: Petr Voříąek, Czech Society for Ornithology, Na Bělidle 34, CZ-150 00 Prague 5, Czech Republic, phone +420 257212465, e-mail: EuroMonitoringbirdlife.cz.

Technical assistant: Jana ©korpilová, PECBMS, Czech Society for Ornithology, Na Bělidle 34, CZ-150 00 Prague 5, Czech Republic, phone +420 257212465, email: skorpilovabirdlife.cz.

Technical assistant (part time): Alena Klvaňová, PECBMS, Czech Society for Ornithology, Na Bělidle 34, CZ-150 00 Prague 5, Czech Republic, phone +420 257212465, email: klvanovabirdlife.cz.

Project manager: Richard Gregory, Head of Species Monitoring and Research, Royal Society for the Protection of Birds, The Lodge, Sandy, Bedfordshire, SG19 2DL, United Kingdom, e-mail: richard.gregoryrspb.org.uk

Reference

BirdLife International (2013) The BirdLife checklist of the birds of the world, with conservation status and taxonomic sources. Version 6. Downloaded from http://www.birdlife.org/datazone/userfiles/file/Species/Taxonomy/BirdLife_Checklist_Version_6.zip

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