Adaption potential of Crassostrea gigas to ocean acidification and disease caused by Vibrio harveyi

The survival and development of bivalve larvae is adversely impacted by ocean acidification and Vibrio infection, indicating that bivalves need to simultaneously adapt to both stressors associated with anthropogenic climate change. In this study, we use a half-dial breeding design to estimate herita...

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Bibliographic Details
Published in:ICES Journal of Marine Science
Main Authors: Davide Nordio, Natalie Khtikian, Sean Andrews, Daniela Bertotto, Karen Leask, Timothy Green
Other Authors: Nordio, Davide, Khtikian, Natalie, Andrews, Sean, Bertotto, Daniela, Leask, Karen, Green, Timothy
Format: Article in Journal/Newspaper
Language:English
Published: International Council for the Exploration of the Sea 2020 2020
Subjects:
aquaculture
Crassostrea
genetic selection
ocean acidification
Vibrio
Crassostrea gigas
Ocean acidification
Online Access:http://hdl.handle.net/11577/3348929
https://doi.org/10.1093/icesjms/fsaa080
Description
Summary:The survival and development of bivalve larvae is adversely impacted by ocean acidification and Vibrio infection, indicating that bivalves need to simultaneously adapt to both stressors associated with anthropogenic climate change. In this study, we use a half-dial breeding design to estimate heritability (h2) for survival to Vibrio harveyi infection and larval shell length to aragonite undersaturated and normal conditions in laboratory-reared Crassostrea gigas. Phenotypic differences were observed between families for these traits with heritability estimated to be moderate for survival to V. harveyi challenge (h2 1⁄4 0.25) and low for shell length in corrosive (Xaragonite 1⁄4 0.9, h2 1⁄4 0.15) and normal conditions (Xaragonite 1⁄4 1.6, h2 1⁄4 0.15). Predicted breeding values for larval shell length are correlated between aragonite-undersaturated and normal conditions (Spearman r 1⁄4 0.63, p < 0.05), indicating that larger larvae tend to do better in corrosive seawater. Aquaculture hatcheries routinely cull slow-growing larvae to reduce and synchronize time taken for larvae to metamorphose to spat, thus inadvertently applying sizerelated selection for larger larvae. This indirect selection in the hatchery populations provides a plausible explanation why domesticated oyster populations are less sensitive to ocean acidification.

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