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R. Soc. B."],"published-print":{"date-parts":[[2025,11]]},"abstract":"<jats:p>\n                    Ocean acidification can reduce the size of calcified structures produced by marine calcifiers, raising questions about their competitiveness and persistence in future oceans. Yet, size reduction in calcified structures may represent a plastic response to ocean acidification if these structures remain functional. To test this hypothesis and examine whether morphological plasticity can influence the functionality of calcified structures, we assessed the effects of ocean acidification on the morphological, mechanical and chemical properties of the calcified structures of a sea urchin species prevailing at natural CO\n                    <jats:sub>2<\/jats:sub>\n                    vents. We found that the rigid shells covering sea urchins\u2019 bodies (\u2018tests\u2019) were thinner and that they had smaller teeth and lower spine density at vents, but the mechanical performance of these calcified structures (mechanical resilience, wear resistance and bending strength) was maintained, possibly mediated by the capacity of sea urchins to sustain acid\u2013base balance for calcification (i.e. increased Na\/Ca). Our findings suggest that such morphological shifts in calcified structures may enable sea urchins to maintain structural performance under ocean acidification. Since ocean acidification is a slow process relative to the life cycle of sea urchins, some sea urchin species may acclimate, or even adapt, to ocean acidification so that their populations and ecological functions can persist in a future high-CO\n                    <jats:sub>2<\/jats:sub>\n                    world.\n                  <\/jats:p>","DOI":"10.1098\/rspb.2025.1893","type":"journal-article","created":{"date-parts":[[2025,11,26]],"date-time":"2025-11-26T00:10:31Z","timestamp":1764115831000},"update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Morphological adjustments enable sea urchins to sustain calcified structure function under ocean acidification"],"prefix":"10.1098","volume":"292","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5846-3401","authenticated-orcid":true,"given":"Jonathan Y. 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