Selectively bred oysters can alter their biomineralization pathways, promoting resilience to environmental acidification

Fitzer, S. C. , McGill, R. A.R. , Torres Gabarda, S., Hughes, B., Dove, M., O'Connor, W. and Byrne, M. (2019) Selectively bred oysters can alter their biomineralization pathways, promoting resilience to environmental acidification. Global Change Biology, 25(12), pp. 4105-4115. (doi: 10.1111/gcb.14818) (PMID:31554025) (PMCID:PMC6899863)

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Commercial shellfish aquaculture is vulnerable to the impacts of ocean acidification driven by increasing carbon dioxide (CO2) absorption by the ocean as well as to coastal acidification driven by land run off and rising sea level. These drivers of environmental acidification have deleterious effects on biomineralization. We investigated shell biomineralization of selectively bred and wild‐type families of the Sydney rock oyster Saccostrea glomerata in a study of oysters being farmed in estuaries at aquaculture leases differing in environmental acidification. The contrasting estuarine pH regimes enabled us to determine the mechanisms of shell growth and the vulnerability of this species to contemporary environmental acidification. Determination of the source of carbon, the mechanism of carbon uptake and use of carbon in biomineral formation are key to understanding the vulnerability of shellfish aquaculture to contemporary and future environmental acidification. We, therefore, characterized the crystallography and carbon uptake in the shells of S. glomerata, resident in habitats subjected to coastal acidification, using high‐resolution electron backscatter diffraction and carbon isotope analyses (as δ13C). We show that oyster families selectively bred for fast growth and families selected for disease resistance can alter their mechanisms of calcite crystal biomineralization, promoting resilience to acidification. The responses of S. glomerata to acidification in their estuarine habitat provide key insights into mechanisms of mollusc shell growth under future climate change conditions. Importantly, we show that selective breeding in oysters is likely to be an important global mitigation strategy for sustainable shellfish aquaculture to withstand future climate‐driven change to habitat acidification.

Item Type:Articles
Additional Information:MB was supported by the Australian Research Council [DP150102771].
Glasgow Author(s) Enlighten ID:McGill, Dr Rona and Fitzer, Dr Susan
Authors: Fitzer, S. C., McGill, R. A.R., Torres Gabarda, S., Hughes, B., Dove, M., O'Connor, W., and Byrne, M.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Global Change Biology
ISSN (Online):1365-2486
Published Online:25 September 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Global Change Biology 25(12): 4105-4115
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172851An understanding of biomineralisation pathways is key to predict climate change impact on aquacultureSusan FitzerNatural Environment Research Council (NERC)NE/N01409X/1GES - Geography