Abstract
I examined the effects of the size and disposition of patches of the plant Salvia iodochroa, on visitation rates of the hurnmingbird Selasphorus flarnrnula . Data were obtained in Cerro de la Muerte (3100 m), Costa Rica during February 1989. The study area was an overgrown, partly shaded pasture, in which S. iodochroa flowers ocurred in one large patch and seven smaller ones at different distances from the large one. The quantity of visits and the visitation rate decreased in tbe srnaller patches in direct relation to their distance from tbe large patch. The spatial disposition of the flowers in relation to other striking resources was important in detennining the visitation pattem of the hurnmingbird.
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