Abstract
-The median density of shorebirds during their non-breeding season on the coast of South America was significantly greater in coastal zones with high primary productivity than in zones with moderate and low primary productivity. A world-wide review showed that sites harboring large numbers of wintering and migratory shorebirds corresponded significantly with regions of high coastal zone productivity. We suggest that the spacing of rich intertidal foraging habitats along the world's coastlines has been an important feature in the evolution of long distance migration by shorebirds. Received 16 November 2000, accepted 20 December 2000.
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