Reductions in a limiting nutrient might be expected to necessitate compromises in the functional traits that depend on that nutrient; yet populations existing in locations with low levels of such nutrients often do not show the expected degradation of functional traits. Indeed, logperch ( Percina caprodes ), pumpkinseed sunfish ( Lepomis gibbosus ) and yellow perch ( Perca flavescens ) residing in low‐calcium water in the Uppe...