Extremely Slow Metabolism Helps Colossal Squid Survive Harsh Antarctic Conditions

The colossal squid conserves energy with a metabolism far slower than most surface-dwelling squid.

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Polar gigantism is observed in multiple Antarctic species, from isopods to sea spiders.

Cold Antarctic waters reduce metabolic demand, allowing Mesonychoteuthis hamiltoni to grow large while maintaining relatively low energy expenditure. This adaptation supports survival in food-scarce deep environments.

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Lower metabolic rates mean the squid does not need constant feeding. Instead, it can endure long intervals between successful hunts, an essential trait in the sparsely populated deep ocean.

This energy-efficient biology illustrates how gigantism in cold marine ecosystems can be linked to oxygen availability and temperature-driven metabolic scaling.

Source

Marine Ecology Progress Series

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