Figure 3
(a) Mean stable isotope values for skin samples of Rice’s whale and their potential prey items from the Gulf of Mexico and (b) simulated mixing region for the biplot shown in panel (a), including the positions of Rice’s whales (black dots) in relation to their prey (white crosses), including the trophic enrichment factor from Borrell et al.48 (δC = 1.29 ± 0.56; δN = 2.73 ± 0.58). Contours are used to illustrate probabilities within the mixing region at 5% (the outermost contour) and every 10% interval, illustrated using the color scale and contour lines. The 95% mixing region is the area within the 5% contour.
