Osmoregulatory traits for all Uca species evaluated to date from the American and Indo-west Pacific regions.

We provide habitat and hemolymph osmolalities, lower (LL50) and upper (UL50) lethal limits, hemolymph osmolalities at LL50 (OsmLL50) and UL50 (OsmUL50), and isosmotic point (all in mOsm/kg H2O; 30 mOsm/kg H2O = 1 ‰ salinity), and calculated indices of hyper- and hypo-regulatory buffering capabilities. Indices close to 1 reflect substantial ability to buffer hemolymph osmolality against variation in external osmolality; values near 0 reveal very limited regulatory ability, reflecting restricted ability to maintain hemolymph osmolality. Species are ordered on increasing habitat salinity within each region.