International Whaling Commission (IWC) Programmes on Chemical Pollution
Research on cetaceans indicates that many classes of chemical pollutants, particularly persistent organic pollutants, are so-called ‘endocrine disrupters,’ meaning that they interfere with the hormone system and can increase susceptibility to disease and reduce reproductive success. The huge number of synthetic chemicals released into the environment and their interactions makes quantifying impacts on whale populations a complex task.
The IWC Scientific Committee has initiated four programmes, Pollution 2000, Pollution 2000+, Pollution 2020 and Pollution 2025. The first two initiatives examined tissue concentrations of priority pollutants in key cetacean species and determined toxicological markers and health assessment endpoints to determine adverse health effects, culminating in the development of tools and techniques to estimate population level effects.
The IWC Scientific Committee has also initiated work on the sources of Polychlorinated Biphenyls (PCBs) which pose a significant ongoing threat to some cetacean populations long after their production was banned. Pollution 2020, assessed the risk to cetaceans from microplastics and polycyclic aromatic hydrocarbons (PAHs). Pollution 2025 is focused on cumulative effects and multiple stressors. Pollution 2025 is also setting out a multi-disciplinary, ‘One Health’ approach, recognising that the health of people, animals and the environment are closely connected.