Crystallographic and geochemical responses of giant clams on turbid reefs

Kimberley Mills and Sindia Sosdian and Duncan D. Muir and Eleanor H. John and Nadia Santodomingo and Kenneth Johnson and Zarinah Waheed and Ben Buse (2025) Crystallographic and geochemical responses of giant clams on turbid reefs. Scientifc Reports, 15 (7365). pp. 1-13. ISSN 2045-2322

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Abstract

Marine calcifying organisms on coral reefs face significant threats from various anthropogenic stressors. To better understand how these organisms will respond to a rapidly changing ocean, it is crucial to investigate their biomineralization across different reef environments. Despite their resilience and potential as conservation hotspots, turbid reefs—projected to expand throughout the 21st century—remain understudied, including a limited knowledge of biomineralization processes within these environments. Herein, for the first time, we assess the crystallographic and geochemical signatures of aragonite giant clam shells Tridacna squamosa from high and low turbid reefs in the Coral Triangle. Shell composition is strongly influenced by turbidity and biominerals formed in a high turbid reef show a more organized crystal orientation and significantly lower element-to-calcium ratios (magnesium/calcium, strontium/calcium). We hypothesize that these variations are driven by physiological changes related to the trophic flexibility of T. squamosa, utilizing both autotrophic and heterotrophic mechanisms. Observed differences may have implications for biomechanical and defense responses of shells, important in their ability to survive future change.

Item Type:	Article
Keyword:	Coral reefs, Marine, Giant clams
Subjects:	Q Science > QH Natural history > QH1-278.5 Natural history (General) > QH1-(199.5) General Including nature conservation, geographical distribution Q Science > QL Zoology > QL1-991 Zoology > QL360-599.82 Invertebrates
Department:	INSTITUTE > Borneo Marine Research Institute
Depositing User:	SITI AZIZAH BINTI IDRIS -
Date Deposited:	18 Jul 2025 14:08
Last Modified:	18 Jul 2025 14:08
URI:	https://eprints.ums.edu.my/id/eprint/44579

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