Publication details

Persistence, bioaccumulation and vertical transfer of pollutants in long-finned pilot whales stranded in Chilean Patagonia

Authors

GARCIA-CEGARRA Ana M. JUNG Jean-Luc ORREGO Rodrigo PADILHA Janeide de A. MALM Olaf FERREIRA-BRAZ Bernardo SANTELLI Ricardo E. POZO Karla Andrea PŘIBYLOVÁ Petra ALVARADO-RYBAK Mario AZAT Claudio KIDD Karen A. ESPEJO Winfred CHIANG Gustavo BAHAMONDE Paulina

Year of publication 2021
Type Article in Periodical
Magazine / Source Science of the Total Environment
MU Faculty or unit

Faculty of Science

Citation
Web https://www.sciencedirect.com/science/article/pii/S0048969721003259?via%3Dihub
Doi http://dx.doi.org/10.1016/j.scitotenv.2021.145259
Keywords Globicephala melas; Persistent organic pollutants; Trace elements; Mass stranding; Chilean Patagonia
Description Long-finned pilot whales (LFPW) are cetaceans with strong social groups often involved in mass strandings worldwide. However, these beachings occur for reasons that are not fully understood. In 2016, 124 LFPW were stranded on the Chilean Patagonian islands, offering a unique opportunity to obtain crucial information on the ecology, biology, and genetics of this population. In addition, we examined whether persistent organic pollutants (POPs) and trace elements (TEs) were responsible for this mass mortality. Stable isotopes (delta C-13 & delta N-15) and genetic analyses were used to reconstruct the trophic ecology, social structure, and kinship of LFPW and compared to POPs and TEs levels found in LFPW. Mitochondrial DNA analyses on 71 individuals identified four maternal lineages within the stranded LFPW. Of these animals, 32 individuals were analyzed for a suite of POPs, TEs, and lipid content in blubber. The highest levels were found for SDDXs (6 isomers) (542.46 +/- 433.46 ng/g, lw) and for total Hg (2.79 +/- 1.91 mg/kg, dw). However, concentrations found in these LFPW were lower than toxicity thresholds and those reported for LFPW stranded in other regions. Evidence was found of SDDX, S7PCBs, and Cd bioaccumulation and maternal transfer of POPs in mother/offspring groups. Nevertheless, no clear relationship between contaminant concentrations and LFPW mortality was established. Further research is still needed to assess LFPW populations including conservations status and exposure to chemicals in remote areas such as Patagonia.

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