Seabirds are important biological indicators and provide an “early warning” system for various types of contaminants.
Several seabird species also consume man-edible items and give us some direct information on the risk of pollution by heavy metals.
Mediterranean seabirds face a critical level of survival. Shags, for example, rare in the Mediterranean, face death in gill nets of fishermen. Tern colonies  are increasingly  being disturbed by tourism developments along our last natural coastlines. Drainage of lagoons threatens the few colonies of Mediterranean and Slender-billed Gulls. Shearwaters and Storm Petrels are menaced by oil pollution at sea.

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