Aim The aim of this study was to understand the interplay between local and regional factors as drivers of population physiological diversity in a tropical freshwater crab species. Location Western Ghats, south‐west India. Taxon Barytelphusa cunicularis, Brachyura, Crustacea. Methods We applied an integrative approach combining population genetics and whole animal physiology, using the tropical freshwater crab Barytelphusa cun...