Pubblicazione scientifica

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

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità

RIASSUNTO

Abstract

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.

DATA

Data di pubblicazione: 25/09/2019

AUTORI

FITZER SUSAN C
MCGILL RONA A R
TORRES GABARDA SERGIO
HUGHES BRIAN
DOVE MICHAEL
OCONNOR WAYNE
BYRNE MARIA

ENTE DI AFFERENZA

INST AQUACULTURE UNIV STIRLING STIRLING UK
SCOTTISH UNIV ENVIRONMENTAL RSCH CTR SCOTTISH ENTPR TECH PARK EAST KILBRIDE UK
SCHOOL OF MEDICAL SCIENCES UNIV SYDNEY SYDNEY NSW AUSTRALIA
HUNTER LOCAL LAND SRVC TAREE NSW AUSTRALIA
NEW SOUTH WALES DEPT PRIMARY IND FISHERIES NSW PORT STEPHENS FISHERIES INST TAYLORS BEACH NSW AUSTRALIA
SCHOOL OF LIFE & ENVIRONMENTAL SCIENCES UNIV SYDNEY SYDNEY NSW AUSTRALIA

RIVISTA

Global Change Biology, 25(12), 4105-4115

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