Fig. 2From: Influence of oceanographic structures on foraging strategies: Macaroni penguins at Crozet IslandsThe positions of one bird overlaid on oceanographic features. a Map of Sea Surface Temperature (°C). b Okubo–Weiss parameter: eddy cores are characterized by negative values. c Finite-size Lyapunov exponents (δ 0 = 0.01°, δf = 0.6°): larger values indicate stronger transport barriersBack to article page