This report presents an enlarged set of population trends and indices of 135 common bird species in Europe, which have been produced by Pan-European Common Bird Monitoring Scheme in 2008. The trends and indices presented in this report cover time period 1980 - 2006, although data back to 60s are available from some European countries.
Updated multi-species indices (indicators) are also published on this web site (see).
Special thanks to the data providers & organisations responsible for national data collection and analysis: Norbert Teufelbauer, Michael Dvorak, Christian Vansteenwegen, Anne Weiserbs, Jean-Paul Jacob, Anny Anselin, Thierry Kinet, Anotoine Derouaux, Svetoslav Spasov, Jiri Reif, Henning Heldbjerg, Michael Grell, Andres Kuresoo, Jaanus Elts, Risto A. Väisänen, Fréderic Jiguet, Johannes Schwarz, Martin Flade, Tibor Szep, Olivia Crowe, Dick Coombes, Lorenzo Fornasari, Elisabetta de Carli, Ainars Aunins, Ruud P. B. Foppen, Magne Husby, Przemek Chylarecki, Dagmara Jawinska, Geoff Hilton, Ana Meirinho, Juan Carlos del Moral, Ramón Martí, Virginia Escandell, Åke Lindström, Sören Svensson, Hans Schmid, David G. Noble, Mike Raven, Andrew Joys. The national data providers helped not only with data provision but also with many valuable comments.
Zdeněk Vermouzek and Tomáš Telenský helped with data management, TT also with this web presentation. Arco Van Strien and Adriaan Gmelig Meyling contributed with final data analysis and computation procedure.
We thank to Richard Gregory, Zoltan Waliczky, Ian Burfield, Grégoire Lois, Lukáš Viktora, Lucie Hošková, Norbert Schaffer, David W. Gibbons, Nicola Crockford, Jose Tavares, Sergi Herrando, Dominique Richard and Anne Teller for valuable comments and help with data collation, analysis and for general support.
Thanks to the many thousands of skilled volunteer counters responsible for data collection.
The project has been supported by the Royal Society for Protection of Birds (RSPB), the BirdLife International Partner in the UK. Since January 2006 the project has been supported by the European Community. Sole responsibility lies with the author and the European Commission is not responsible for any use that may be made of the information contained in this document.
Other significant partners of the project are: Statistics Netherlands, Czech Society for Ornithology (CSO, BirdLife International Partner in the Czech Republic), British Trust for Ornithology (BTO), Dutch Organisation for Field Ornithology (SOVON), EBCC and BirdLife European Partnership.
Trend information was derived from annually operated national breeding bird surveys spanning different periods from 21 European countries, obtained through the Pan-European Common Bird Monitoring Scheme (PECBMS). A software package named TRIM (which allows for missing counts in the time series and yields unbiased yearly indices and standard errors using Poisson regression) was used to calculate national species´ indices and then to combine these into supranational indices for species, weighted by estimates of national population sizes. Weighting allows for the fact that different countries hold different proportions of each species´ European population. Updated population size estimates were used for weighting and were derived from BirdLife International (2004). Although national schemes differ in count methods in the field, these differences do not influence the supranational results because the indices are standardised before being combined. An improved hierarchical imputation procedure was used to calculate supranational indices.
More detailed information on computation methods is summarized in special report (see).
Species characteristic for main habitat types have been classified using improved procedure accepted at the PEBCMS workshop in Prague in 2005. This procedure is based on species classification within four main biogeographical regions, Atlantic, Boreal, Continental and Mediterranean. Species habitat classification has not undergone any changes since last year, details on species classification procedure can be found here.
National monitoring coordinators provided data on 244 species, however, data on many species were poor that European index could not be produced. Finally, reliable European index was produced on 135 species. The data come from 21 countries including data from new scheme in Bulgaria started in 2004. Moreover, compared to last year, Estonia provided data over the larger time period (1983 - 2006).
The countries are: Austria, Belgium, Bulgaria, Czech Republic, Denmark, Estonia, Finland, France, Germany, Hungary, Ireland, Italy, Latvia, Netherlands, Norway, Poland, Portugal, Spain, Sweden, Switzerland, United Kingdom.
The countries provided the data for different time periods (see).
Results are summarised in the table.
For graph of species´ index, click on species name in the table. For drawing and comparing graphs for several species at once, tick a check box at left side of a species name and click on a button "Show graphs for selected species" below the table to confirm and proceed your selection.
Despite the data quality control, quality of outputs might differ species by species. Furthermore, year to year fluctuations might not always reflect real population change. Therefore we recommend cautious interpretation of year by year changes and readers should also pay attention to species legend. For any use of the results presented in this report, we strongly recommend to consult PECBMS coordination unit.
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 1982-2006.
3) Data for Short-term Trend and Short-term Slope available over the period 1991-2006.
4) Data for Short-term Trend and Short-term Slope available over the period 1996-2006.
5) Data for Short-term Trend and Short-term Slope available over the period 1999-2006.
6) Data for Short-term Trend and Short-term Slope available over the period 2004-2006.
a) Trend - change (in %) in an index value between the first and the last year of a time period (Long-term Trend - over the period 1980-2006, Short-term Trend - over the period 1990-2006).
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 error (SE) in parenthesis (Long-term Slope - over the period 1980-2006, Short-term Slope - over the period 1990-2006).
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farm - farmland
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