title: Screening of organic and metal contaminants in Australian humpback dolphins (Sousa sahulensis) inhabiting an urbanised embayment.
abstract: As a marine mammal species that inhabits shallow nearshore waters, humpback dolphins are likely exposed to a wide range of pollutants from adjacent land-based activities. Increased mortality rates of Australian humpback dolphins (Sousa sahulensis) in waters off a major urbanised centre triggered investigations into the threats to these species, including their contaminant exposure. The present study utilised archived tissues from 6 stranded animals to screen for a range of pollutants (PCDD/Fs, PBDEs, PCBs, organochlorine pesticides, PAHs, organotins, essential and non-essential elements) to inform future biopsy based biomonitoring strategies. Concentrations of PCBs and DDXs in blubber of some of these animals were remarkably high, at levels near or above toxicological thresholds associated with immune- and reproductive toxicity or population declines in other marine mammals. PBDEs, PAHs, HCB, organotins, 'drins' as well as other organic pesticides were not detected, or present at relatively low concentrations. Profiles of elements were similar in epidermis compared to other tissues, and apart from some exceptions (e.g. Fe, Cr, Co, Cu) their concentrations fell within 25th-75th percentiles of cetacean baselines in four of the five animals. Non-essential elements (Al, V, Pb, Ba, Ni, Cd) were notably elevated in one specimen which may have experienced poor health or nutritional status. These data provide a first insight into the contaminant status of a rare and poorly studied population inhabiting an urbanised area. The results highlight a need for future biomonitoring of live populations, and inform on priorities in the typically limited blubber and skin sample volumes obtained through biopsies.
authors.affiliation: National Research Centre for Environmental Toxicology (ENTOX), The University of Queensland, 39 Kessels Road, Coopers Plains, QLD 4108, Australia. Electronic address: l.weijs@uq.edu.au.
authors.forename: Liesbeth
authors.initials: L
authors.lastname: Weijs
authors.affiliation: National Research Centre for Environmental Toxicology (ENTOX), The University of Queensland, 39 Kessels Road, Coopers Plains, QLD 4108, Australia.
authors.forename: Soumini
authors.initials: S
authors.lastname: Vijayasarathy
authors.affiliation: National Research Centre for Environmental Toxicology (ENTOX), The University of Queensland, 39 Kessels Road, Coopers Plains, QLD 4108, Australia.
authors.forename: C Alexander
authors.initials: CA
authors.lastname: Villa
authors.affiliation: Eurofins GfA Lab Service GmbH, Hamburg, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Neugebauer
authors.affiliation: Queensland Department of Environment and Heritage Protection, Brisbane, Australia.
authors.forename: Justin J
authors.initials: JJ
authors.lastname: Meager
authors.affiliation: National Research Centre for Environmental Toxicology (ENTOX), The University of Queensland, 39 Kessels Road, Coopers Plains, QLD 4108, Australia. Electronic address: c.gaus@uq.edu.au.
authors.forename: Caroline
authors.initials: C
authors.lastname: Gaus
mesh_terms: D000818:Animals; D001315:Australia; D004289:Dolphins; D004784:Environmental Monitoring; D005260:Female; D008297:Male; D019216:Metals, Heavy / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis*; D014507:Urbanization; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D019216:Metals, Heavy; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical
keywords: Biomonitoring; POPs; Sample archive; Threatened species; Trace metals; Tropical dolphins