Article

The Berlengas islands are located in the transition area between the mediterranean and atlanti c regions. The increase in the Larus argentatus population brings to a modification of the vegetation structure. In order to study to which region the autochtonous vegetation is close, ressembI ance analysis is made between these islands, the Cies islands in the Galicia Iittoral and Medes islands in the mediterranean littoral, who are subjected to the same conditions of blooming of maritime birds.