Analysing of the Czech Republic monitoring scheme for EU-protected butterflies Dusky Large Blue (\kur{Phengaris nausithous}) and Scarce Large Blue (\kur{Phengaris telejus}).

Two species of European Community interest, Dusky Large Blue (Phengaris nausithous) and Scarce Large Blue (Phengaris telejus) were monitored by external workers in the Czech Republic for six seasons (2005-2010). The data of abundance and environmental conditions was collected from both legally protected and unprotected localities. Abundance changes were assessed and their relationships to several external predictors were investigated. Some factors influencing trends in populations were found