The Great Bustard Otis tarda is the heaviest extant flying bird, it ranges across central and southern Europe, Western Russia and some temperate areas of central and eastern Asia to the Pacific, occupying open steppe grasslands and extensively cultivated fields (Del Hoyo et al.
The two subspecies of great bustard are isolated distribution in China, Otis tarda tarda, disperses in the west of the Xinjiang Autonomous Region while Otis tarda dybowskii mainly distribute in central and northeast China, and their distribution areas show no overlaps.
Recent status and population decline of the Great Bustard Otis tarda in Iran.
Distribution, size and recent trends of the great bustard Otis tarda population in Madrid region, Spain.
Diet of young great bustards Otis tarda in Spain: sexual and seasonal differences.
The case against Portugal concerns the Campo Maior, a special protection area in the Eastern hinterland of the country which is very important for a range of endangered wild bird species such as the Little Bustard, Tetrax tetrax, the Black-bellied Sandgrouse, Pterocles orientalis, the Lesser Kestrel, Falco naumanni and, the Great Bustard, Otis tarda
28) indicated that Otis tarda tends to live in marginal habitats.
Keywords: Otis tarda, habitat suitability, ENFA, GIS.
The Sootav plain is the most important habitant in Iran where significant number (about 18 pieces) of reproducing population of Otis tarda is found (Abdulkarimi et al.
So it is necessary that habitat suitability of Otis tarda will be modeled using the modern methods and technologies such as ENFA, GIS and remote sensing to determine the most important effective parameters on distribution and habitat mapping of this bird as a very valuable, rare and endangered one.
As a result, certain Annex I species, particularly steppic species such as the Great Bustard, Otis tarda
, are poorly covered by the existing SPA network.