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<p>Due to climate change, the ocean is losing its ability to retain oxygen, resulting in widespread deoxygenation and increasing the number of hypoxic events. Early life stages of marine animals are expected to be more sensitive to oxygen deprivation than later ontogenetic stages. Here, we evaluated the effect of chronic mild hypoxia (predicted ocean deoxygenation – CMH; 93% air saturation) and acute (nocturnal moderate hypoxia – NMH, 52%; and nocturnal severe hypoxia – NSH, 26% air sat.) oxygen decrease on the oxidative stress response of the early life stages of two coastal cephalopod species, the European cuttlefish (<i>Sepia officinalis</i>) and the European squid (<i>Loligo vulgaris</i>). Both species revealed lower hatching success under NMH (cuttlefish: 72 ± 17%; squid: 76 ± 5%) compared to normoxia conditions (84 ± 2%; 82 ± 5%). All oxidative stress indicators (SOD, GST, TAC, HSP70, CAT, and 8-OHdG), except MDA, did not change under the different oxygen treatments. The present findings suggest that the embryos and newborns of both cephalopod species can physiologically withstand ocean deoxygenation and nocturnal hypoxia to some extent.</p>

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Low oxidative stress of cephalopod early life stages under chronic and intermittent hypoxia

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Mélanie Court,
  • Marta Macau,
  • Tânia Marquês,
  • Tiago Repolho,
  • Mário Diniz,
  • Vanessa Madeira Lopes,
  • Rui Rosa,
  • José Ricardo Paula

摘要

Due to climate change, the ocean is losing its ability to retain oxygen, resulting in widespread deoxygenation and increasing the number of hypoxic events. Early life stages of marine animals are expected to be more sensitive to oxygen deprivation than later ontogenetic stages. Here, we evaluated the effect of chronic mild hypoxia (predicted ocean deoxygenation – CMH; 93% air saturation) and acute (nocturnal moderate hypoxia – NMH, 52%; and nocturnal severe hypoxia – NSH, 26% air sat.) oxygen decrease on the oxidative stress response of the early life stages of two coastal cephalopod species, the European cuttlefish (Sepia officinalis) and the European squid (Loligo vulgaris). Both species revealed lower hatching success under NMH (cuttlefish: 72 ± 17%; squid: 76 ± 5%) compared to normoxia conditions (84 ± 2%; 82 ± 5%). All oxidative stress indicators (SOD, GST, TAC, HSP70, CAT, and 8-OHdG), except MDA, did not change under the different oxygen treatments. The present findings suggest that the embryos and newborns of both cephalopod species can physiologically withstand ocean deoxygenation and nocturnal hypoxia to some extent.