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September 5, 2025Open Access

An unpredictable body size response to the Permo–Triassic climate crisis

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This study analyzes body size responses of marine ectotherm species during a climate crisis, suggesting different mechanisms at play.

The study reveals that the body size dynamics of marine bivalves during the Permo-Triassic crisis were complex and unexpected.
Almost complete turnover at the species level shows newly evolved species are typically smaller, but existing species' sizes remained stable.
This observational analysis shows that the temporary reduction in body size is due to the evolution of smaller species, challenging the concept of the 'Lilliput effect'.
The findings indicate that abiotic and biotic factors influence body size recovery differently during the climate crisis, highlighting the unpredictability of species responses.

Foster et al. (2025) studied this question.

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