Species indices and trends are produced for Europe and its regions (Central & East, North, South, West, and Southeast Europe, East Mediterranean and West Balkan) and for EU and its regions: New (since 2004) and Old EU Members States).
The species indices are always computed for maximum time period given by the country with the longest data set within the region (e.g. indices for West Europe are produced since 1966 given by the starting year of the indices from UK, while indices from South Europe are produced since 1989 given by the starting year of indices from France – see an overview below).
Overview showing list of 28 countries, their start years and region that each country belongs to:
|Country/region||Region (group of countries)||First year||Last year|
|Republic of Ireland8)||WE||1998||2016|
WE – West Europe
NE – North Europe
SE – South Europe
SEE – Southeast Europe
CEE – Central & East Europe
First year – first year of data time series in a country/region
Last year – last year of data time series in a country/region
Time series for individual species from national schemes are shorter in certain cases.
1) Data for Belgium were combined from Wallonia and Brussels regions but not updated this year.
2) Data for Cyprus come from two schemes that partly differ in their regional coverage, Volunteer Common Birds Census (2006-2017) and Western Cyprus Common Bird Census (2006-2011). Data from both schemes were combined.
3) Data for France come from two schemes, old (1989-2001) and new one (2001-2017). Data from both schemes were combined.
4) Data for Germany were combined from schemes in former East and West Germany and also newly from old scheme (Häufige Brutvögel alt, 1989-2010) and new scheme (Häufige Brutvögel neu, 2005-2017).
5) Data for Latvia come from three different schemes, two old ones (differ in their regional coverage, and cover the periods 1995-2006 and 2003-2006, respectively) and a new one (2005-2017). Data from all schemes were combined.
6) Data for Norway come from three schemes, Norsk Hekkefugltaksering, HFT (1996-2008), Terrestrisk overvåking, TOV-I (1996-2008) and Terrestrisk overvåking – Ekstensiv, TOV-E (2006-2017). Data from all schemes were combined.
7) Data for Sweden come from two schemes, old (1975-2017) and new one (1998-2017). Data from both schemes were combined.
8) Data for Republic of Ireland and Romania were not updated due to technical reasons.
Although we produce all species indices for the maximum time period (since the first year of time period available), we publish only the European indices since the year 1980 at the earliest since when the index is based on data from several countries – see the latest version of species indices and trends.
The species trends are produced for the maximum time period and for shorter periods as well: since 1980, 1990, 2000, 2008 and 2013. For simplicity only, we publish the long-term trends (the trends which starting year varies from 1980 to 1998) and the ten-year trends (the trends for last ten years, i.e. 2008-2017).