Effects of nesting yellow-legged gulls (Larus cachinnans pallas) on the heavy metal content of soils in the Cies Islands (Galicia, North-West Spain)

cadmio cadmium charadriiformes chrome chromium cinc coastal soils cobre copper cromo cuivre espagne gaviota (laridae) gulls heavy metals islands islas laridae lead metales pesados mouette nesting nidification plomb plomo pollution du sol soil pollution sol littoral spain suelo costero zinc