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Reneerkens et al. (202 investigated the demographic consequences of long-distance migration for Sanderlings Calidris alba, an Arctic-breeding species of sandpiper. Their research populace has actually an amazing geographical circulation with a breeding range that is concentrated in northeast Greenland and Ellesmere Island, Canada but a nonbreeding range that expands across 85° of latitude from Scotland to Namibia. The writers report on unexpected habits of latitudinal variation in three demographic paramet