The salinisation of fresh-water habitats is a growing threat to biotic communities. To protect the biodiversity and ecosystem services and goods associated with these systems, effective monitoring is essential. Here, researchers present the Salinity Association Group Index (SAGI), a novel tool for the assessment of salinity in fresh-water habitats. Three case studies demonstrate how SAGI can enhance our understanding of salinity-mediated ecological impacts on aquatic macroinvertebrate communities.
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