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}
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Poluição por mercúrio ameaça vida selvagem do Ártico 2b582t
Tecnologia 5cw3f Poluição por mercúrio ameaça vida selvagem do Ártico 2b582t Publicado
24 horas ago on
14/06/2025
Segundo uma nova pesquisa, as correntes oceânicas estão transportando grandes quantidades de mercúrio para a região
Imagem: Risto Raunio/Shutterstock Apesar das reduções globais nas emissões de mercúrio , as concentrações desta substância continuam aumentando no Ártico . Segundo uma nova pesquisa, as correntes oceânicas podem ser as responsáveis por este cenário.
O estudo foi realizado por pesquisadores da Universidade de Aarhus e da Universidade de Copenhague, ambas na Dinamarca. De acordo com eles, esta contaminação representa uma ameaça de longo prazo aos ecossistemas e à saúde humana na região.
Animais como o urso polar estão ameaçados pela contaminação (Imagem: Don Landwehrle/Shutterstock) Mercúrio pode permanecer nos oceanos por séculos 1h293a A equipe responsável pelo trabalho explica que o mercúrio liberado na atmosfera a partir da combustão de carvão e da mineração de ouro, por exemplo, pode permanecer no ar por cerca de um ano. No entanto, uma vez que entra no oceano, ele pode persistir nestes ambientes por mais de três séculos.
Isso significa que, mesmo com as atuais reduções de emissões, os níveis de mercúrio podem continuar elevados no Ártico por centenas de anos. Mas como a contaminação chegou até esta região era um mistério.
Correntes oceânicas são as responsáveis por transportar o mercúrio para regiões distantes (Imagem: bluefish_ds/Shutterstock) Segundo os pesquisadores, o mercúrio foi transportado de países como a China, grande produtora da substância, através das correntes oceânicas. Este processo pode levar até 150 anos e que ajuda a explicar a falta de declínio nos níveis de mercúrio do Ártico.
Baleias podem ser impactadas pelo alto nível de mercúrio no Ártico (Imagem: Henry Harrison/Shutterstock) Substância ameaça sobrevivência de vários animais 4l563 O mercúrio é uma neurotoxina potente. Nos principais predadores do Ártico, como ursos polares e baleias dentadas, as concentrações são agora 20 a 30 vezes maiores do que antes da industrialização. A substância afeta o sistema imunológico, a reprodução e possivelmente as funções sensoriais dos animais, o que pode afetar a sobrevivência deles. Um cenário que representa sérios riscos à saúde não apenas dos ecossistemas, mas também das comunidades humanas que dependem da caça para alimentação. As descobertas foram descritas em estudo publicado na revista Nature Communications .
Colaboração para o Olhar Digital
Alessandro Di Lorenzo é formado em Jornalismo pela Universidade Federal do Rio Grande do Sul (UFRGS) e atua na área desde 2014. Trabalhou nas redações da BandNews FM em Porto Alegre e em São Paulo.
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