Effects of Grazing Pressure on Succession Process and Productivity of Old Fields on Mediterranean Islands.

/ Five experimental sites, located on four islands of the Aegean archipelago, were selected in order to assess the grazing-mediated recovery of natural vegetation in old fields. Years after abandonment of cultivation ranged from 5 to 40. Grazing pressure was proved of considerable magnitude in all but the Santorini site, which recovers without mediation of intense grazing.