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The ability of many animals to access and exploit food  is dependent on the ability to move. In the case of scavenging birds, which use  soaring flight to locate and exploit ephemeral resources, the cost and speed of  movement vary with meteorological factors. These factors are likely to modify  the nature of interspecific interactions, as well as individual movement  capacity, although the former are less well understood. We used aeronautical  models to examine how soaring performance varies with weather within a guild of  scavenging birds and the consequences this has for access to a common resource.  Birds could be divided broadly into those with low wing loading that are more  competitive in conditions with weak updraughts and low winds (black vultures  and caracaras), and those with high wing loading that are well adapted for  soaring in strong updraughts and moderate to high winds (Andean condors).  Spatial trends in meteorological factors seem to confine scavengers with high  wing loading to the mountains where theyout-compete other birds; a trend that  is borne out in worldwide distributions of the largest species. However, model  predictions and carcass observations suggest that the competitive ability of  these and other birds varies with meteorological conditions in areas where  distributions overlap. This challenges the view that scavenging guilds are  structured by fixed patterns of dominance and suggests that competitive ability  varies across spatial and temporal scales, which may ultimately be a mechanism  promoting diversity among aerial scavengers.Fil: Shepard, Emily L. C.. Swansea University; Reino UnidoFil: Lambertucci, Sergio Agustin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Patagonia Norte. Instituto de Investigación en Biodiversidad y Medioambiente; Argentin

From daily movements to population distributions: weather affects competitive ability in a guild of soaring birds