Abstract
Environmental gradients across 109 British estuaries were examined in relation to the communities of shorebirds in winter. Ordination and classification techniques were employed on the 5-year means of peak-winter high-tide counts for the 13 most common species, converted to densities, for the two periods, 1969-75 (first period) and 1981 -85 (second period), in order to quantify changes in community composition between the two periods. Multiple regression within GLIM was then used to relate the DCA ordination scores to physical, climatic, geographic and water chemistry variables. In an ordination analysis of the combined data for the two periods, axis 1 had a left-right gradient of species favouring coastal lagoons (avocet) to those favouring sandy estuaries (bar-tailed godwit, sanderling, knot)
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