2008: Population trends of 48 common terrestrial bird species in Europe: results from the Pan-European Common Bird Monitoring Scheme. — Revista Catalana d’Ornitologia 24

The Pan-European Common Bird Monitoring Scheme has brought together data from national monitoring schemes from 18 European countries. This data has been used to provide European indices for 48 common bird species (24 woodland species, 24 farmland species). The indices were calculated for each country using the program TRIM, which estimates missing counts using Poisson regression. National indices were combined to produce regional indices, imputing missing counts for particular sites*years within countries. Missing year totals of particular countries were estimated from other countries of the same European region (Central & East, North, South and West Europe); these regions were then combined to produce European indices. The estimated breeding population size in each country was used as a weighting factor. Most farmland bird species (17) declined in Europe (long-term trend, period 1966-2002), five species increased and two species ’ trends were classified as poorly known. Long-term trends of woodland birds show a slightly different picture; 11 species declined, 8 remained stable and 5 increased