Breeding bird monitoring in the Wadden Sea
Since 1991, a wide range of shorebirds breeding in the Schleswig-Holstein Wadden Sea are annually monitored at 12 representative sample sites (census areas) and additional sites. Counts are carried out up to five times between end of April and mid-June. These counts are carried out throughout the entire Wadden Sea from The Netherlands to Denmark using standardised methods. Reports are regularly issued by the Common Wadden Sea Secretariat within the framework of the Trilateral Monitoring and Assessment Programme (TMAP) and are separately available for Schleswig-Holstein.
Since 1992, comparative bird counts are carried out annually as part of scientific quality assurance (Blew et al. 2003, 2008). At the end of May/beginning of June breeding bird experts meet in one of the four Wadden Sea regions (The Netherlands, Lower Saxony, Schleswig-Holstein or Denmark) to jointly conduct comprehensive counts. The collected data are compared with each other and, in the case of colony counts, with for example clutch counts or aerial surveys. Lately, drones are also being used to carry out surveys.