| ways to be different: foraging adaptations that facilitate higher intake rates in a northerly wintering shorebird compared with a low-latitude conspecific. | at what phenotypic level do closely related subspecies that live in different environments differ with respect to food detection, ingestion and processing? this question motivated an experimental study on rock sandpipers (calidris ptilocnemis). the species' nonbreeding range spans 20 deg of latitude, the extremes of which are inhabited by two subspecies: c. p. ptilocnemis that winters primarily in upper cook inlet, alaska (61°n) and c. p. tschuktschorum that overlaps slightly with c. p. ptilocne ... | 2015 | 25714569 |