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}
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Vídeo mostra tubarões usando arraia de forma inusitada 5p5r35
Tecnologia 5cw3f Vídeo mostra tubarões usando arraia de forma inusitada 5p5r35 Publicado
1 dia ago on
14/06/2025
Nas profundezas do Arquipélago de Revillagigedo, no Pacífico oriental, pesquisadores registraram um momento intrigante: tubarões usando raias-manta para se coçar . A equipe gravou o evento em dois mergulhos no Canyon e no Cabo Pearce em dezembro de 2024 e fevereiro de 2025, enquanto faziam uma pesquisa.
Os registros mostram tubarões de Galápagos (Carcharhinus galapagensis ) se esfregando em grandes raias-manta (Mobula birostris ) em estações de limpeza baseadas em substrato . Nesses locais, animais marinhos se reúnem para usar outros seres para se limpar.
Durante as três interações registradas, os tubarões reduziram sua velocidade para se aproximar e depois aceleraram antes do contato. “Os tubarões raspavam principalmente as superfícies ventrais das mantas usando suas cabeças, regiões branquiais e áreas laterais associadas a altas cargas de ectoparasitas”, escreveram os pesquisadores no artigo , ainda não revisado por pares.
Arraias evitaram tubarões adultos 5d4d55 As mantas são conhecidas pela comunidade cientifica como frequentadoras dessas estações de limpeza, geralmente em conjunto com o peixe-anjo-de-Clarion (Holacanthus clarionensis ). Porém, durante a interação com o C. galapagensis, elas apresentaram diferentes respostas ao contato, desde ivas até ativamente fugindo e evitando os tubarões.
“A manta exibiu forte comportamento evasivo após repetidas tentativas de raspagem, incluindo três giros para trás, múltiplas mudanças de direção e acelerações para longe do tubarão, com a intensidade da evasão aumentando ao longo dos cinco eventos de raspagem”, explicam os cientistas.
Nas observações, foi possível detectar que as mantas toleraram tubarões jovens e evitaram rapidamente a aproximação de um adulto. Segundo o portal IFLScience , esse comportamento pode estar associado ao fato de que tubarões já foram registrados atacando mantas juvenis.
Algumas arraias mais velhas carregam cicatrizes desses conflitos, o que pode ter influenciado seu comportamento ao ver um adulto se aproximando, as fazendo fugir para evitar a ameaça.
Raias-manta podem atingir uma envergadura de até 8 metros e pesar mais de duas toneladas. (Imagem: kaschibo/Shutterstock)
Mantas podem estar em perigo 11133c Os pesquisadores sugerem que as mantas podem ser uma alternativa às estações de limpeza com peixes limpadores. Elas se movem e há menos competição para á-las.
O grupo propõe a hipótese de que a falta desses “peixes faxineiros” está relacionada à intensificação do turismo nessas regiões . A presença de pessoas afeta o sistema, interrompendo os eventos de limpeza, algo que pode estar alterando o comportamento dos tubarões.
“Pesquisas futuras devem avaliar se essas interações afetam a saúde dos tubarões e das mantas, seja por meio da transmissão de doenças ou do estresse comportamental, especialmente à medida que as comunidades de peixes limpadores declinam em resposta às pressões ambientais e humanas”, concluíram os pesquisadores.
OLHAR DIGITAL – Link original da matéria
