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Nemo! Peixes-palhaço diminuem de tamanho para sobreviver 3ut6q

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Um novo estudo científico aponta que peixes-palhaço, semelhantes ao personagem Nemo do famoso filme da Pixar “Procurando Nemo“, estão encolhendo para sobreviver diante do aumento extremo das temperaturas marinhas.

A pesquisa, publicada na revista Science Advances, foi conduzida por cientistas da Universidade de Newcastle (Inglaterra) e observou mudanças drásticas no tamanho corporal desses peixes durante as intensas ondas de calor oceânico registradas em 2023.

Descobertas do estudo sobre os peixes-palhaço 3v5y42

  • Os pesquisadores acompanharam pares de peixes-palhaço que vivem em recifes de coral na Baía de Kimbe, em Papua-Nova Guiné — região considerada um dos principais pontos de biodiversidade marinha do planeta;
  • Durante o verão de 2023, quando a temperatura dos oceanos subiu rapidamente, os cientistas constataram que os peixes perderam peso e reduziram seu tamanho em vários milímetros.
  • Cerca de 75% dos animais monitorados encolheram, ao menos, uma vez durante o período de calor extremo.

De acordo com a Dra. Theresa Rueger, professora de Ciências Marinhas Tropicais e coautora do estudo, o fenômeno vai além de uma simples perda de peso.

“Esses peixes estão, de fato, mudando ativamente de tamanho corporal como adaptação fisiológica. Tornam-se menores, o que reduz suas necessidades energéticas e melhora a eficiência no uso de oxigênio em ambientes mais quentes e com menos oxigênio disponível”, explica à BBC.

Adaptação fisiológica pode ser a chave para sobreviver às ondas de calor marinhas, segundo cientistas (Imagem: Beto_Junior/iStock)

Os cientistas acreditam que o corpo do peixe pode estar absorvendo gordura e até massa óssea, como já foi observado em outras espécies afetadas por mudanças climáticas, como as iguanas marinhas. Essa hipótese, no entanto, ainda precisa ser comprovada por meio de estudos laboratoriais.

Aquecimento global impacta vida dos animais 3s211d

A descoberta amplia o conjunto de evidências de que diversas espécies estão alterando sua forma física para lidar com o aquecimento global.

Casos semelhantes já foram registrados em aves, insetos e répteis. “Nemo pode ter um novo capítulo pela frente, em que ele não só enfrenta desafios familiares, mas também precisa lidar com um oceano em constante transformação”, comentou Rueger.

O estudo alerta para o impacto silencioso e profundo das mudanças climáticas na vida marinha. A diminuição do tamanho corporal pode ter consequências ecológicas importantes, afetando equilíbrio alimentar, reprodução e capacidade de fuga de predadores.

Para os pesquisadores, entender essas transformações é essencial para prever como os ecossistemas marinhos reagirão às crescentes pressões ambientais nas próximas décadas.

Impacto do aquecimento global foi observado em estudo com peixes-palhaço (Imagem: Zelenenka/Shutterstock)




OLHAR DIGITAL – Link original da matéria

Notícias do Brasil e do Mundo

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