Rapid multi-generational acclimation of coralline algal reproductive structures to ocean acidification

• Main Authors: Moore, Billy, Comeau, Steeve, Bekaert, Matthieu, Cossias, Amelie, Purdy, Ashley, Larcombe, Ellis, Puerzer, Frankie, McCulloch, Malcolm, Cornwall, Christopher
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: conceptacles; coralline algae; multi-generational; pH variability; Ocean acidification
• Online Access: https://doi.org/10.5061/dryad.280gb5mpv

The future of coral reef ecosystems is under threat because vital reef-accreting species such as coralline algae are highly susceptible to ocean acidification. Although ocean acidification is known to reduce coralline algal growth rates, its direct effects on the development of coralline algal reproductive structures (conceptacles) is largely unknown. Furthermore, the long-term, multi-generational response of coralline algae to ocean acidification is extremely understudied. Here, we investigate how mean pH, pH variability and the pH regime experienced in their natural habitat affect coralline algal conceptacle abundance and size, across six generations of exposure. We show that second generation coralline algae exposed to ocean acidifcation treatments had conceptacle abundances 60% lower than those kept in present day conditions, suggesting that conceptacle development is initially highly sensitive to ocean acidification. However, this negative effect of ocean acidification on conceptacle abundance disappears after three generations of exposure. Moreover, we show that this transgenerational acclimation of conceptacle development is not facilitated by a trade-off with reduced investment in growth, as higher conceptacle abundances are associated with crusts with faster growth rates. These results indicate that the potential reproductive output of coralline algae may be sustained under future ocean acidification. Funding provided by: Centre of Excellence for Coral Reef Studies, Australian Research Council Crossref Funder Registry ID: http://dx.doi.org/10.13039/100014402 Award Number: CE140100020 Funding provided by: Centre of Excellence for Coral Reef Studies, Australian Research Council Crossref Funder Registry ID: http://dx.doi.org/10.13039/100014402 Award Number: DE160100668 Funding provided by: The Royal Society of New Zealand Te Apārangi* Crossref Funder Registry ID: Award Number: RDF-VUW1701 Funding provided by: Centre of Excellence for Coral Reef Studies, Australian Research Council Crossref Funder ...