Distribution of Butterflies (Lepidoptera: Papilionoidea) in Estonia: Results of a Systematic Mapping Project Reveal Long-Term Trends

The distribution of butterflies was mapped throughout entire Estonia in 2016 and 2017. Butterflies were surveyed during three phenologically targeted visits at more than 1200 pre-selected sites. In total, over 180 000 individuals belonging to 97 species were recorded. We compare the resulting distribution maps with historical records, and discuss changes in the species' distribution. We conclude that, within the time frame of century, the...