Contaminant assessment of stranded and deceased beaked whales (Ziphiidae) on the New South Wales coast of Australia

• Published in: Marine pollution bulletin 2024-07, Vol.204, p.116520, Article 116520
• Main Authors: Palmer, Natalie, Reichelt-Brushett, Amanda, Hall, Jane, Cagnazzi, Daniele, Rose, Karrie, March, Duane
• Format: Article
• Language: English
• Subjects: Beaked whale; Cadmium; Mercury; Metal; PCBs; POPs; Whale
• ISSN: 0025-326X; 1879-3363; 1879-3363
• DOI: 10.1016/j.marpolbul.2024.116520

Metal and organic pollutants are prominent marine contaminants that disperse widely throughout the environment. Some contaminants biomagnify, leaving long-lived apex predators such as cetaceans at risk of toxicity. Various tissues collected post-mortem from 16 Ziphiidae individuals that stranded on the New South Wales (NSW) coast, Australia, over ∼15 years were investigated for 16 metals/metalloids and 33 organic contaminants. Polychlorinated biphenyls (PCBs) and Dichlorodiphenyltrichloroethanes (DDTs) were commonly detected in blubber and liver tissues. Mercury, cadmium and silver exceeded reported toxicity thresholds in several individuals. The liver tissue of a Mesoplodon layardii specimen had the highest mercury (386 mg/kg dry weight). Liver tissue of a Mesoplodon grayi specimen had the highest silver concentration (19.7 mg/kg dry weight), and the highest cadmium concentration was in Ziphius cavirostris kidney (478 mg/kg dry weight). This study provides important new information for rare Ziphiidae species globally. [Display omitted] •PCBs and DDXs most commonly detected organic contaminants•Elevated mercury, cadmium and silver in several whales•Mercury to selenium toxicity ratios exceeded 1:1 in some individuals•Some of the highest silver concentrations reported in Southern Hemisphere cetaceans