96 
Psyche 
[Vol. 88 
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FREQUENCY OF POTENTIAL NEST SITES 
Figure 2. Within-species frequencies of utilized nest sites as a function of potential 
nest site frequencies, for 5 impressa group species. Closed circles refer to log nest sites, 
open circles to stones. 
stones, fallen epiphytes) encountered as well as the number of actual 
nest site occupancies (Table 3). It seems clear that nest site 
availability varies from species to species. For both rotten log and 
stone nest sites there are positive correlations (r = 0.94, p < .02, in 
both instances, arcsine transformed data) between the proportion of 
a species’ colonies found in a particular nest site and the relative 
frequency of that nest site for the species (Figure 2). This suggests 
that species-specific preferences are partly a function of nest site 
availability. (No such correlation is found for fallen epiphytes — 
confusa showns the highest preference for this nest site despite its 
relative rarity in the southern rainforests; however, the numbers are 
in all instances rather low.) 
The relative abundances of species can be crudely compared by 
