POPs in free-ranging pilot whales, sperm whales and fin whales from the Mediterranean Sea: Influence of biological and ecological factors

• Published in: Environmental Research
• Main Authors: Pinzone, Marianna, Budzinski, Hélène, Tasciotti, Aurélie, Ody, Denis, Lepoint, Gilles, Schnitzler, Joseph, Scholl, Georges, Thomé, Jean-Pierre, Tapie, Nathalie, Eppe, Gauthier, Das, Krishna
• Other Authors: MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
• Format: Article in Journal/Newspaper
• Language: English
• Published: Academic Press 2015
• Subjects: marine mammals; stable isotopes; persistent organic pollutants; Mediterranean Sea; toxicity; Life sciences; Aquatic sciences & oceanology; Environmental sciences & ecology; Sciences du vivant; Sciences aquatiques & océanologie; Sciences de l’environnement & écologie; Balaenoptera physalus; Fin whale; Physeter macrocephalus; Sperm whale; toothed whales
• Online Access: https://orbi.uliege.be/handle/2268/183774; https://doi.org/10.1016/j.envres.2015.06.021

peer reviewed The pilot whale Globicephala melas, the sperm whale Physeter macrocephalus and the fin whale Balaenoptera physalus are large cetaceans permanently inhabiting the Mediterranean Sea. These species are subjected to numerous anthropogenic threats, such as exposure to high levels of contaminants. Therefore, selected persistent organic pollutants, POPs (29 PCBs, 15 organochlorine compounds, nine PBDEs and 17 PCDD/Fs), were analysed in the blubber biopsies of 49 long-finned pilot whales, 61 sperm whales and 70 fin whales collected in the north-western Mediterranean Sea (NWMS) from 2006 to 2013. The contamination profile and species feeding ecology were combined through the use of stable isotopes. δ13C, δ15N values and POPs levels were assessed through IR-MS and GC-MS, respectively. To assess the toxic potency of the dioxin-like compounds, the TEQ approach was applied. δ15N values were 12.2 ± 1.3‰ for sperm whales, 10.5 ± 0.7‰ for pilot whales and 7.7±0.8‰ in fin whales, which positions sperm whales at higher trophic levels. δ13C of the two odontocetes were similar and amounted to −17.3±0.4‰ for sperm whales and −17.8±0.3‰ for pilot whales, whereas the result for fin whales reflected more depleted (−18.7±0.4‰). This outcome indicates a partial overlap in the feeding habits of toothed whales and confirms the differences in feeding behaviour of the mysticete. Pilot whales had higher concentrations than sperm whales for ΣPCBs (38666 ± 25731 ng.g-1 lw and 22849 ± 15566 ng.g-1 lw, respectively), ΣPBDEs (712±412 ng.g-1 lw and 347±173 ng.g-1 lw, respectively) and ΣDDTs (46081±37506 ng.g-1 lw and 37647±38518 ng.g-1 lw, respectively). Fin whales had the lowest values, which reflected its trophic position (ΣPCBs: 5721±5180 ng.g-1 lw, ΣPBDEs: 177±208 ng.g-1 lw and ΣDDTs: 6643±5549 ng.g-1 lw). Each species was characterized by large inter-individual variations that are more related to sex than trophic level. Males presented a higher contaminant burden than females. The discriminant analysis (DA) confirmed how DDTs ...