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UNLOCKing the Mechanisms that Shape Coral Skeletal Chemistry

Objective

Compositional variations in coral skeletons are widely used as proxies of environmental change and are powerful archives of past ocean conditions. However, a limit is placed on their accuracy by ‘vital effects’ – a black box of species- and colony-specific processes tied to coral physiology and biomineralisation that mask and distort the environmental control on skeletal composition. Despite knowing about vital effects for >70 years, progress to overcome them has been frustratingly slow because the composition of the fluid used for skeleton construction is unknown.

UNLOCK will go beyond the state-of-the-art by developing a novel cryo-analytical toolkit to directly measure the chemical and isotopic composition of the calcifying fluid for the first time. This will be integrated with other innovative techniques to address four core objectives: 1) determine how environment influences the composition of the calcifying fluid and hence skeleton; 2.) identify the role of metastable phases and precipitation rate in controlling proxy sensitivity; 3.) quantify how skeletal construction processes shape spatial heterogeneity and the recording of environmental signals; and 4.) develop numerical models of coral vital effects to underpin the next-generation of palaeoclimate reconstructions and provide a robust frame-work for using skeletal geochemistry to quantify the environmental sensitivity of coral physiology.

By UNLOCKing the chemistry of the calcifying fluid, we will transform our understanding of vital effects to deliver unprecedented accuracy in palaeoclimate reconstructions on centennial to millennial timescales and revealing how coral physiology responds to a rapidly changing ocean.

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Programme(s)

Topic(s)

Funding Scheme

HORIZON-ERC - HORIZON ERC Grants

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Call for proposal

(opens in new window) ERC-2025-ADG

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Host institution

UNIVERSITY OF SOUTHAMPTON
Net EU contribution
€ 3 104 682,11
Address
Highfield
SO17 1BJ SOUTHAMPTON
United Kingdom
Region
South East (England) Hampshire and Isle of Wight Southampton
Activity type
Higher or Secondary Education Establishments
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Total cost
No data

Beneficiaries (2)