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main theme of this conference is how the feeding conditions, through their effect on the rate of food intake of individual birds, affects these population processes and so bird density. While factors uninfluenced by bird density (e.g. weather) will affect intake rate, the link between bird density and intake rate could be important to the dynamics of the population because it provides a potential feedback loop. The link may be either positive or negative i.e. an increase in bird density may either increase or decrease the rate of feeding. While positive effects may occur in nature, this paper is concerned only with negative effects. Testing for the existence of these in the field, let alone investigating the processes involved, is normally difficult because both the rates of food intake and food abundance are difficult to measure. Wading birds feeding on invertebrates on estuaries, mainly outside the breeding season, are good subjects for this kind of work because their activities are easily seen and the food supply is relatively simple to measure. This

Competition for Food and Interference among Waders