Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The zooplankton data used in this study are available as part of a bigger GBIF data repository: ‘Limnic freshwater pelagic invertebrates biogeographical mapping/inventory NTNU University Museum’, https://doi.org/10.15468/ubpk0i (Hårsaker and Daverdin 2023). The data from lake Jonsvatn were selected from the main dataset by filtering the geographic sampling locations before downloading (GBIF.org 2025).