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Ocean acidification but not warming alters sex determination in the Sydney rock oyster, Saccostrea glomerata

journal contribution
posted on 2023-05-19, 16:01 authored by Parker, LM, O'Connor, WA, Byrne, M, Dove, M, Coleman, RA, Portner, H-O, Scanes, E, Patti VirtuePatti Virtue, Gibbs, M, Ross, PM
Whether sex determination of marine organisms can be altered by ocean acidification and warming during this century remains a significant, unanswered question. Here, we show that exposure of the protandric hermaphrodite oyster, Saccostrea glomerata to ocean acidification, but not warming, alters sex determination resulting in changes in sex ratios. After just one reproductive cycle there were 16% more females than males. The rate of gametogenesis, gonad area, fecundity, shell length, extracellular pH and survival decreased in response to ocean acidification. Warming as a sole stressor slightly increased the rate of gametogenesis, gonad area and fecundity, but this increase was masked by the impact of ocean acidification at a level predicted for this century. Alterations to sex determination, sex ratios and reproductive capacity will have flow on effects to reduce larval supply and population size of oysters and potentially other marine organisms.

History

Publication title

Proceedings of the Royal Society of London. Biological Sciences

Volume

285

Issue

1872

Article number

20172869

Number

20172869

Pagination

1-9

ISSN

0962-8452

Department/School

Institute for Marine and Antarctic Studies

Publisher

Royal Soc London

Place of publication

6 Carlton House Terrace, London, England, Sw1Y 5Ag

Rights statement

Copyright 2018 the authors.

Repository Status

  • Restricted

Socio-economic Objectives

Biodiversity in Antarctic and Southern Ocean environments

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