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

Ana M. Garcia-Cegarra, Jean Luc Jung, Rodrigo Orrego, Janeide de A. Padilha, Olaf Malm, Bernardo Ferreira-Braz, Ricardo E. Santelli, Karla Pozo, Petra Pribylova, Mario Alvarado-Rybak, Claudio Azat, Karen A. Kidd, Winfred Espejo, Gustavo Chiang, Paulina Bahamonde

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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 (δ13C & δ15N) 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 ΣDDXs (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 ΣDDX, Σ7PCBs, 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.

Original languageEnglish
Article number145259
JournalScience of the Total Environment
Volume770
DOIs
Publication statusPublished - 20 May 2021

Keywords

  • Chilean Patagonia
  • Globicephala melas
  • Mass stranding
  • Persistent organic pollutants
  • Trace elements

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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