Abstract
Morphological and behavioral data were collected for nine species seen most frequently in tropical mixed species antwren flocks. Ratios of bill size differ by _1.14 for one-third of the species-pairs. Values of potential overlap in diet (a), based on body weight ratios are _0.63 for all species-pairs. Each behavioral aspect of foraging strategy and microhabitat selection; substrate searched, vertical foraging height, foraging method, foliage density and position, is significantly different among >?2 species-pairs. Mean length and rate of foraging movements differ significantly among 12/28 and 18/28 species-pairs, respectively. The correlation between species ranked with respect to behavioral versus morphological differences is highly significant. Twenty-one intraspecific aggressive encounters occurred, each when a species attempted to join a flock for which that species was already present. Coefficient of Association (CA) is used to quantify interspecific association: 94% of the values of CA are positive, 11 of which are significant. No negative values of CA are significant. CA is not significantly correlated with a in behavioral parameters.
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