Bird densities and species diversity in five different habitats of the shrub tundra of southern Yamal, Russia.

Subscripts: Total area of the habitat on the four study plots (Area), total number of species observed over the eight study years (Nb species), average density of birds in the habitat when summing all species (Total density, standard deviations reflecting variation among years are given in brackets), and species richness (standard deviations reflecting variation among years are given in brackets).