Figure 7
(a) Expected species accumulation curves based on Chao1 estimate of prey taxa richness of LLB and STE. Average and bootstrapped SD are based on 1,000 permutations. The curves appear to be approaching asymptote, indicating that most prey taxa were sampled. The vertical line indicates that when taking into account a similar sample size (n = 32 nests) more prey taxa were found in LLB than in STE diets. (b) Comparison (Independent sample t-tests) of the total fraction of each prey category (reptiles, birds, mammals and arthropods) between the two raptor species. *= 0.01 < P < 0.05, ***= P < 0.001, ns = not significant (P > 0.05). Box = 25th and 75th fractions; bars = min and max values; black lines = median; red dots = outliers. (c) Comparison (Repeated measures ANOVA) between the consumption of lizards (Sauria) versus snakes (Ophidia) between the two raptor species. Box = 25th and 75th fractions; bars = min and max values; black lines = median; red dots = outliers. Note that LLB consumed higher percentages of lizards, while STE consumed much higher percentages of snakes. (d) Multi-dimensional scaling (MDS) plot of similarity in dietary prey taxa of the two raptor species during the breeding season. Each point represents one nest. The diets of LLB and STE were significantly different, indicating that each species selected different proportions of prey items. The lines represent a 15% and 30% similarity contours, so all samples inside each contour have a similarity above these two values.
