Figure 3
Schematic representation of the rationale of the GIS proximity analysis. Black dots represent the records of occurrence of a given number of stygobitic harpacticoid species within 20 km from the boundary between two adjacent groundwater habitat types. CONS: aquifers in consolidated rocks; UNCONS: aquifers in unconsolidated sediments; NonAQ: practically non-aquiferous rocks30. For each pair of groundwater habitats (e.g. CONS/UNCONS) the patterns of occurrence of stygobitic harpacticoids up to 20 km from the boundary were examined first for a habitat (e.g. CONS from CONS/UNCONS) and then for the other (e.g. UNCONS from CONS/UNCONS).
