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A short study of the foraging behaviour and food resources of migrant waders on an Orkney Island beach

Info

Pages
274 – 279

Published
1 December 21

Authors
Robert J. Douthwaite, Quinten Hollick, Christine Knight, David Knight, Peter Matthiessen

DOI
10.18194/ws.00244

Correspondence
Christine Knight
christine.knight83@ntlworld.com
107 Teg Down Meads, Winchester, SO22 5NG, UK

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We report a brief, descriptive study of the feeding ecology of waders on Papa Westray island, Orkney, Scotland, in mid-May 2018. We recorded the numbers, distribution and foraging behaviour of birds throughout the tidal cycle in relation to the distribution of seaweed stranded on and growing in an 80-m wide section of sand and boulder beach. We surveyed invertebrates from locations where birds were seen foraging. Supra-littoral, beach-cast seaweed contained a rich invertebrate fauna, which was mostly inaccessible to the waders and only exploited during warm, calm weather when insects and arachnids emerged. More waders foraged on the beach during rising tide than falling tide. The study illustrates the importance of both supra-littoral and intertidal degrading seaweed for sand-dwelling, detritus-feeding invertebrates as the base of a short food-chain supporting migrant waders.