Figure 3
From: Coordinated vigilance provides evidence for direct reciprocity in coral reef fishes
Graphical representation of coordination between foraging and vigilance in four species of rabbitfish pairs.
Axes mark the angles of individuals in pairs (θA, θB), while each point represents the angle assumed at a given 5-second point intercept with the size varying according to the number of overlying points. The four predicted smoothed lines mark the predicted fits from generalized additive mixed effects models (GAMMs) and their upper and lower 95% confidence interval. In all species, data are predominantly spread between the upper left and lower right quartile of the plot. The smoothing function, fit by automatic cross-validation, suggests that individuals assume contrasting angles (<90° and >90°); however, the extent of the angle is negligible once a certain threshold is reached (~120° and 60°, respectively). The observed pattern was consistent among species. (a) S. corallinus (n = 15), (b) S. vulpinus (n = 15), (c) S. doliatus (n = 15), (d) S. puellus (n = 14). n = number of independent pairs represented in the plot. Fish illustrations are original drawings by Simon J. Brandl.
