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Seal’s mystery ability to tolerate toxic metal could aid medical research, say scientists
Key Excerpts from Article on Website of The Guardian (One of the UK's Leading Newspapers)
Posted: May 8th, 2023
https://www.theguardian.com/environment/2023/apr/29/seals-my...
One of the world’s most isolated aquatic mammals, Arctocephalus philippii, can tolerate high levels of cadmium, as well as other metallic pollutants, without suffering ill effects. A. philippii is the second smallest species of fur seal and lives only on the Juan Fernández archipelago and one or two nearby islands in the Pacific Ocean, hundreds of miles off the coast of Chile. By the 19th century, the species had disappeared and was believed to be extinct until, in the 1960s, a small colony was found in a cave on the island. Since then, the Juan Fernández seal, which has become a protected species, has slowly recovered and has a population of around 80,000. “We collected samples of their faeces and found they contained extremely high levels of cadmium and other elements such as mercury,” said Constanza Toro-Valdivieso of Cambridge University’s conservation research institute. “The discovery was very surprising,” she said. “Cadmium is poisonous to mammals but somehow these seals were processing it and passing it through their digestive systems and seem to be suffering little harm in the process.” High levels were found not only in its faeces but in the bones of seals that had died of natural causes. The researchers also found high levels of silicon in their bones, which may be offsetting the impact of cadmium, they suggest. “The discovery that these animals appear to tolerate high levels of cadmium in their bodies has important medical implications,” said Toro-Valdivieso. “These animals have a lot to tell us.”
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