Facebook post by University of Helsinki

Long-term ecological monitoring schemes increase our understanding of the impacts and predictability of climate change. Utilising mathematical models, researchers were able to show that the overall decline in the Glan­ville fritil­lary butterfly population size was predictable due to the extreme drought in the summer of 2018.
The record dry summer of 2018 collapsed the Glanville fritillary butterfly metapopulation | University of Helsinki helsinki.fi

The decline in the number of butterflies was strongly linked to the climatic conditions.