Figure 2

Mean (dots) and standard deviation (bars) carbon and nitrogen isotopic values in bone-collagen of aquatic mammals collected from the Amazon Estuary and adjacent coastal zones (AE) and Northeastern coast of Brazil (NC). Isotope ratios for marine species presented a spatial trend of decreasing δ¹³C values towards offshore habitats for the following delphinids: Pseudorca crassidens (Pcr), Tursiops truncatus (Ttr), Delphinus sp. (Dsp), Steno bredanensis (Sbr), Grampus griseus (Ggr), Peponocephala electra (Pel), Lagenodelphis hosei (Lho), Globicephala macrorhynchus (Gma), Stenella attenuata (Sat) and the most depleted in δ¹³C and most enriched δ¹⁵N of all cetaceans, Physeter macrocephalus (Pma). Species drawings are not to scale.