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September 17, 2026Journal of Fish BiologyOpen Access

The new norm: Climate change, marine heatwaves and the impact on aquatic systems

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Authors

WPWilliam Bernard Perry

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Overview

Ecological synthesis demonstrates physiological stress and altered migration in aquatic species during marine heatwaves, highlighting widespread disruptions across marine and freshwater ecosystems.

Key Points

  • Synthesize evidence on the impacts of climate change-driven marine heatwaves on species distributions, physiology, and connected aquatic ecosystems.
  • Analyzed commercial fishery catch data for common octopus (Octopus vulgaris) and co-occurring shellfish stocks in the southwest United Kingdom.
  • Evaluated acoustic telemetry tracking combined with sea surface temperature measurements to monitor thermal and behavioral responses in Arctic char (Salvelinus alpinus).
  • Commercial octopus landings in 2025 were nearly 65 times greater than the 2017–2024 annual average, causing negative ramifications for crab, lobster, and scallop fisheries.
  • Internal body temperatures of Arctic char were elevated by +0.64°C during marine heatwave events compared to non-heatwave conditions.
  • Heatwaves altered habitat selection and life history, with smaller char occupying estuaries and fjords and larger individuals migrating into freshwater rivers earlier in the season.

Cite This Study

William Bernard Perry (2026) studied this question.

synapsesocial.com/papers/6aabb73d5f706d05830e62a5https://doi.org/10.1111/jfb.70653
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