Composição da dieta de Caretta caretta (Testudines: Cheloniidae) no Golfo de Gabès, sul da Tunísia

Autores

  • Sami Karaa University of Carthage. National Institute of Marine Sciences and Technologies. Marine Biodiversity Laboratory
  • Sondes Marouani University of Carthage. National Institute of Marine Sciences and Technologies. Marine Living Resources Laboratory
  • Hasna Kadri University of Sfax. Sfax Faculty of Medicine. Pharmacology Laboratory
  • Mohamed Nejmeddine Bradaï Association for the Conservation of Biodiversity in the Gulf of Gabès
  • Imed Jribi University of Sfax. Sfax Faculty of sciences. Laboratory of Marine Biodiversity and Environment

DOI:

https://doi.org/10.11606/issn.2316-9079.v24i1p3-23

Palavras-chave:

Hábitos alimentares, Mar Mediterrâneo, Tartarugas-cabeçudas, Tubos digestivos

Resumo

A investigação de aspectos biológicos fundamentais, como os hábitos alimentares de animais marinhos migratórios de longa distância, como as tartarugas marinhas, apresenta desafios signifi­cativos. Esses estudos são essenciais para identificar os locais de alimentação e as presas preferidas desses quelônios, fornecendo assim informações valiosas para embasar decisões de proteção do habitat. Analisamos o conteúdo do tubo digestivo de 132 espécimes de Caretta caretta encalhadas e/ou capturadas acidentalmente ao longo da costa do Golfo de Gabès, de 2004 a 2010. Os itens alimentares foram analisados usando o Índice de Importância Relativa (IRI), o Índice Alimentar de Geistdoerfer (Q) e o Índice Alimentar Principal (MFI) de Zander. Também categorizamos o lixo e calculamos sua frequência de ocorrência. A dieta da tartaruga-cabeçuda consistiu de 46 espécies de vários grupos zoológicos, refletindo sua distribuição flexível em zonas neríticas pelágicas e bentônicas. Observamos um padrão de alimentação comum para as espécies, com presas que habitam o fundo do mar, comuns em ambientes rasos. Moluscos, artrópodes e poríferos constituíram as principais presas, enquanto tunicados e peixes foram presas secundárias frequentes. Os equinodermos e as algas são presas secundárias acessórias e itens adicionais de segunda ordem, respectivamente. Moluscos e artrópodes foram ingeridos principalmente durante a primavera e o verão, enquanto tunicados e poríferos foram ingeridos durante os meses de outono e inverno. O tamanho da tartaruga não teve efeito sobre a diversidade da dieta ou a porcentagem de biomassa. Este estudo enfatiza o valor da análise da dieta para descobrir a ecologia alimentar e o uso do habitat das tartarugas-cabeçudas no Golfo de Gabès. Proteger e gerenciar essa região e garantir a presença de recursos tróficos pode ser crucial para manter as populações de tartarugas-cabeçudas e aumentar sua sobre­vivência nas águas da Tunísia.

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2025-06-23

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Karaa, S., Marouani, S., Kadri, H., Bradaï, M. N., & Jribi, I. (2025). Composição da dieta de Caretta caretta (Testudines: Cheloniidae) no Golfo de Gabès, sul da Tunísia. Phyllomedusa: Journal of Herpetology, 24(1), 3-23. https://doi.org/10.11606/issn.2316-9079.v24i1p3-23