Elevated seawater temperature causes a microbial shift on crustose coralline algae with implications for the recruitment of coral larvae

Webster, Nicole S. , Soo, Rochelle , Cobb, Rose and Negri, Andrew P. (2011) Elevated seawater temperature causes a microbial shift on crustose coralline algae with implications for the recruitment of coral larvae. The ISME Journal, 5 4: 759-770. doi:10.1038/ismej.2010.152


Author Webster, Nicole S.
Soo, Rochelle
Cobb, Rose
Negri, Andrew P.
Title Elevated seawater temperature causes a microbial shift on crustose coralline algae with implications for the recruitment of coral larvae
Journal name The ISME Journal   Check publisher's open access policy
ISSN 1751-7362
1751-7370
Publication date 2011-04-01
Sub-type Article (original research)
DOI 10.1038/ismej.2010.152
Open Access Status Not yet assessed
Volume 5
Issue 4
Start page 759
End page 770
Total pages 12
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Abstract Crustose coralline algae (CCA) are key reef-building primary producers that are known to induce the metamorphosis and recruitment of many species of coral larvae. Reef biofilms (particularly microorganisms associated with CCA) are also important as settlement cues for a variety of marine invertebrates, including corals. If rising sea surface temperatures (SSTs) affect CCA and/or their associated biofilms, this may in turn affect recruitment on coral reefs. Herein, we report that the CCA Neogoniolithon fosliei, and its associated microbial communities do not tolerate SSTs of 32 °C, only 2–4 °C above the mean maximum annual SST. After 7 days at 32 °C, the CCA exhibited clear signs of stress, including bleaching, a reduction in maximum quantum yield (Fv/Fm) and a large shift in microbial community structure. This shift at 32 °C involved an increase in Bacteroidetes and a reduction in Alphaproteobacteria, including the loss of the primary strain (with high-sequence similarity to a described coral symbiont). A recovery in Fv/Fm was observed in CCA exposed to 31 °C following 7 days of recovery (at 27 °C); however, CCA exposed to 32 °C did not recover during this time as evidenced by the rapid growth of endolithic green algae. A 50% reduction in the ability of N. fosliei to induce coral larval metamorphosis at 32 °C accompanied the changes in microbiology, pigmentation and photophysiology of the CCA. This is the first experimental evidence to demonstrate how thermal stress influences microbial associations on CCA with subsequent downstream impacts on coral recruitment, which is critical for reef regeneration and recovery from climate-related mortality events.
Keyword Crustose coralline algae
Biofilms
Temperature
Microbes
Bleaching
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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Created: Tue, 12 Sep 2017, 16:53:21 EST by Rochelle Soo on behalf of School of Chemistry & Molecular Biosciences