month mean temperature upper limit that varies with annual temperature sum, from ca. –5°C at ca. 2000 degree days to ca. 5°C at ca. 2500 degree days.
The response surface model has a ‘very good’ fit. Minor deficiencies include failure to simulate scattered northern breeding localities, and too many simulated occurrences in Italy. Simulated occurrences in Transcaucasia fall within the breeding area as mapped by BWP. The simulated future potential distribution is expanded north-westwards, areas as far north as south-east England, southernmost Fennoscandia and Russia to ca. 62° N being simulated as suitable. Suitable conditions are simulated to become more patchy in central and southern Europe, however.
Sisón común (Tetrax tetrax) Little Bustard
Present recorded distribution