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vantagefeed.com > Blog > Science > Dolphins are almost dying from toxic chemicals that have been banned since the 1980s
Dolphins are almost dying from toxic chemicals that have been banned since the 1980s
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Dolphins are almost dying from toxic chemicals that have been banned since the 1980s

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Last updated: April 12, 2025 8:14 pm
Vantage Feed Published April 12, 2025
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Common dolphins tied to a beach in the UK

Waves & Wellies Photography

Sea dolphins around the UK are almost dying from a combination of water temperature and toxic chemicals that the UK banned in the 1980s.

Polychlorinated biphenyls (PCBs) are long-lasting chemical contaminants that were once widely used in industrial manufacturing. They interfere with the breeding and immune response of animals and cause them cancer With humanity.

In a new study, researchers showed that higher levels of PCBs in the body and increased sea surface temperatures are at a higher risk of death from a common shunting dolphin infection (Delphines Delphis), the first of marine mammals.

The ocean is facing a “triple planetary crisis” – the “climate change, pollution, and biodiversity loss,” but we often see the threat alone, says, Rosie Williams At the Zoological Society in London.

Williams and her colleagues analyzed postmortem data from 836 common dolphins marginalized in the UK between 1990 and 2020 and assessed the impact of these interlinked threats.

They found that a rise in PCB of 1 milligram per kilogram of fat has become fatal, with a 1.6% increase in the likelihood of infections such as gastritis, enteritis, bacterial infections, encephalitis, and pneumonia. Every 1°C increase in sea surface temperature corresponded to a 14% increase in the risk of death.

According to this study, the threshold for PCB fat concentrations to significantly affect the risk of dolphin disease was 22 mg/kg, while the average sample concentration was high at 32.15 mg/kg.

Dolphins have a long lifespan, are widely distributed around the UK and are widely distributed in the food chain, making them a good indicator species that shows how threats affect other animals.

“The location at the top of the food web means that toxins from prey accumulate in the enlargement, providing an intensive snapshot of chemical contaminants at the expense of health,” says Thea Taylor. Sussex Dolphin Project.

It was banned in the UK in 1981 and internationally in 2001, but the PCB is still washed down into the ocean. “They are probably still entering the environment through stockpiling, and often are side products or by-products of other manufacturing processes,” Williams says.

Cleaning up your PCB is extremely difficult. “They are nightmares to get rid of because they are so permanent,” she says. “There’s definitely no easy fix.”

While some researchers have explored edging as a cleanup technique, others have focused on improving the effectiveness of water treatment plants in the removal of sustainable chemicals.

These findings show what happens if not taken to ban Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS), another broad group of so-called eternal chemicals.

“We cannot reverse any already-occurring pollution, but it’s important to prevent further chemical input into the environment,” Taylor says.

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