1. NIOZ Royal Netherlands Inst. for Sea Research, Dept of Coastal Systems and Utrecht Univ. Texel the Netherlands
2. Conservation Ecology Group, Groningen Inst. for Evolutionary Life Sciences (GELIFES), Univ. of Groningen Groningen the Netherlands
3. US Geological Survey, Alaska Science Center Anchorage AK USA
4. US Geological Survey, Alaska Science Center Juneau AK USA
5. Microwave Telemetry Ltd Columbia MD USA
6. Schutzstation Wattenmeer e.V. 25813 Husum Germany