Mean annual densities (pairs/km2 with standard errors based on variation among years) of birds observed at the Erkuta monitoring site in 2002–2009 by habitat type.

The overall density in the study area is given, as well as the species specialization index (SSI, corrected for sample size, see main text for details). Distr refers to the distribution type of the species (SA = subarctic distribution; S = southern; W = widespread) and Nest to the general nesting habitat (T = thicket; O = open) as reported by [34].