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Fig. 4 | Movement Ecology

Fig. 4

From: A critical assessment of marine predator isoscapes within the southern Indian Ocean

Fig. 4

a Plasma δ13C (left) and δ15N (right) isoscapes calculated as the mean of 1000 bootstrapped surfaces interpolated using ordinary kriging which randomly sampled twenty-two individuals from all five flying species to account for different numbers of individuals per species. b Isoscapes, using the same bootstrap technique, modelled without the species which did not exhibit a significant latitudinal gradient (i.e. sooty albatrosses were removed from the δ13C isoscape and sooty and grey-headed albatrosses and northern giant petrels were removed from the δ15N isoscape). Position of the sub-tropical (STF), sub-Antarctic (SAF) and Antarctic polar (PF) fronts and Marion Island (black triangle) are indicated

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