KLAASSEN M (1989) Current research: Food Needs of terns in the Wadden. LIMOSA 62 (2): 97-99.

today's marine environment is a lot of charge. the scale is exploited and polluted. disasters are not materialized. The collapse of the loddepopulatie, one of the most fished species in wereId, is probably the cause of the Bear Island in the Barents Sea, 90% of aile Guillemots disappeared classification during 1986-87. Nade rise of the fishing on sandeels around the Shetland Islands, the Arctic terns the last four years there no longer a successful reproduction increasing. And as for disastrous pollution is the sudden decline of the Great Tern in the Wadden Sea due to poisoning chlorinated hydrocarbons in the sixties still fresh in memory ##### Common Tern Sterna hirundo Arctic Tern Sterna paradisaea = Sterna macrura Sandwich Tern Thalasseus sandvicensis = Sterna sandvicensis

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