Table 3. Probability of spatial co-occurrence for two at risk species and fire ants in South Carolina as quantified by using a logistic regression derived fire ant distribution model and a probability of encounter fire ant distribution model. Overall risk index, shown in parentheses, is calculated as the product of the probability of co-occurrence and the hazard index.

Species
Probability of co-occurrence
with fire ants
based on logistic
fire ant model
Probability of co-occurrence
with fire ants
based on probability-of-encounter fire
ant model

Common ground-dove
.8329 (risk index = 0.69)
.6354 (risk index = 0.53)

Swallow-tailed kite
.7210 (risk index = 0.48)
.4025 (risk index = 0.27)