Muutosta Kasviatlaksen kartoilla: Mapping changes in the Atlas data

Changes in the distribution and abundance of vascular plants in Finland were analysed by dividing the plant atlas data into two temporal subsets. The first period contained 1 km2 squares inventoried between 1958 and 1999 (4 248 squares), and the second period contained squares inventoried between 2000 and 2020 (4 132 squares). The results indicate that the number of species
showing increase in abundance between the periods is much higher than the number of declining species. Most of the species showing fastest expansion are mostly neophytes and archaeophytes, as well as a group of apophytic native species. Sample maps for species representing each of the groups are
shown. Overall, human influence seems to be the main factor explaining the dynamics of the vascular flora of Finland during recent decades.