In 2017 I was able to visit Liesjärvi also in May (four days during the last week of May) to make observations of spring butterfly and dragonfly species. Also, I did some bird watching (67 species) and I measured the lake water temperature/EC/pH profile. Details can be found in the Year Report for 2017.
In the second half of July I visited a great number of small lakes with natural peatbog vegetation to collect dragonfly exuvia. This resulted in many new locations with the dragonfly A. subarctica, but also of the butterfly B. aquilonaris. Surpringly, this year I did not observe any A. paphia. Remarkable after the top year 2016. Also, I observed only one single P. c-album.