Mudanças climáticas reduzem os níveis de oxigênio nos rios globais

18 de maio de 2026

Reportado por IA

Rios ao redor do mundo estão perdendo oxigênio dissolvido de forma constante, com as mudanças climáticas sendo identificadas como o principal motor em um novo e abrangente estudo. Quase 80 por cento dos sistemas fluviais analisados apresentaram declínios ao longo de quatro décadas, afetando mais severamente as regiões tropicais.

Pesquisadores examinaram observações de 21.439 trechos de rios coletadas entre 1985 e 2023. Eles determinaram que os níveis de oxigênio caíram a uma taxa média de 0,045 miligramas por litro por década, com 78,8 por cento dos rios afetados pela desoxigenação. O estudo foi liderado pelo Prof. Kun Shi, do Instituto de Geografia e Limnologia de Nanjing, da Academia Chinesa de Ciências, com o Dr. Qi Guan como autor principal e colaboração da Universidade Tongji.

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quarta-feira, 06 de maio de 2026, 13:57h