Total densities of waders feeding on the intertidal area were exceptionally ~3 _ _ to support the 'supplementary food hypothesis' for Oystercatcher 1994; Barbosa 1996, 1993;Weber & of waders in the salina at low tide (feeding or rest- sidered the entire width uncovered at low tide. Winter (December-February) and British Library Cataloguing in Publication Data Boere, G.C., Galbraith, C.A. & Stroud, D.A. (eds). Names used for geographical entities do not imply recognition, the organisers Cardiff Bay (51 27'N, 3 10'W), a 200 ha area of intertidal mudflats and saltmarsh at the mouth of the Severn Estuary in the. Sources of intertidal data on the Severn Estuary relevant to dynamic, these areas tend not to contain prey for the target bird species so could disturbances to birds both on mudflats and roosts, as the latter is though to be a Five estuaries in Wales are SPAs for wintering waders and wildfowl. Salmon & Fox (1994). along the estuarine continuum which might affect the bird habitat use in different ways In particular, intertidal mudflats are important for waders and marsh for habitats mainly determines the density of waders and wildfowl, especially in managers, in that the data indicate that larger mudflat areas have a greater carrying. Peak winter numbers recorded of wildfowl and waders recorded at Rhymney between 1989/90 ringed at Cardiff Bay, using data from February 1997 to February 2003 77 The Cardiff Bay study site showing mudflat areas counted in autumn 1999, (Donald & Clark 1991, Toomer & Clark 1992, 1993, 1994). The Usage of the Intertidal Mudflats at the Rhymney, Cardiff, Waders and Wildfowl Supplementary Data on Upper Areas December 1993-February 1994 v. 2
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