Abstract
Annual breeding productivity of Knots Calidris canutus was estimated by the proportion of first-year birds in winter ringing samples. Significant associations were found between the productivity of Knots, other species that are known to breed on the Taimyr Peninsula, and lemming abundance in that region. It is inferred from this that Knots wintering in southern Africa are of the Russian subspecies canutus unlike British wintering birds which do not show these correlations and are subspecies islandica.
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