The international Wadden Sea is an estuarine tidal area along the North Sea coasts of The Netherlands, Germany and Denmark. It is characteristic for regions with sandy coasts and a medium tidal range. Fifty barrier islands separate the Wadden Sea from the North Sea, and an offshore transition zone to …

Harbour porpoises (Phocoena phocoena) are the smallest cetaceans in the North Sea. They have recovered from being rare to nowadays being present throughout the year in numbers reaching to 80 000 in the Dutch sector or the North Sea. The only area where studies were conducted prior to the disappearance …

In Pembrokeshire/Wales harbor porpoise (Phocena phocena) make daily use of Ramsey sound, a narrow ocean channel characterized by strong tidal currents. The sound is an important socializing and feeding area for porpoise and was designated marine special area of conservation (MSAC) in 2004. The region …