The theory of island biogeography and the significan¬
ce of it's recommendations and predictions in design and management of natural reserves is briefly discussed. The
relations of species diversity and species extinction rates to size and distribution of reserves are presented.
The situation of Persian Fallow Deer (Cervus dama mesopo¬
tamicus) at three" island habitats" of Dez wildlife Refu¬ge, Dashte Naz and Ashk Island(Uromeih Lake) is discussed
in the framework of the predictions of the theory