Introduction No other European gull has shown such a dramatic and rapid change of distribution in the last decades as the Mediterranean Gull Larus melanocephalus. Whereas in the 1940s breeding locations were restricted to coastal areas of the Black Sea in the Ukraine, Mediterranean Gulls can now be found nesting in many places scattered over Europe, in locations as near to Scotland as the Nethe...

conservation tillage, a fast growing practice in iran, is considered as a means to achieve sustainability in agricultural systems. this study was carried out to determine the effect of tillage systems (no-tillage, minimum tillage and conventional tillage ) on yield and yield components of three irrigated wheat varieties. the field experiment was conducted at the experimental station of the univ...