National farmland bird indicators presented on the Eurostat web site are based on the European species classification developed and used by PECBMS. Why aren´t they based on the existent national classification systems?
The national farmland bird indicators presented on the Eurostat web site are constructed by PECBMS. PECBMS uses its own European species classification in order to produce indicators that are comparable and standardized among countries. However, PECBMS currently examines the option to use national species classification systems instead. If it turns out that standardization can be maintained when national classification systems are used, PECBMS will develop guidelines to design such systems.