scholarly journals Losing a winner: thermal stress and local pressures outweigh the positive effects of ocean acidification for tropical seagrasses

2018 ◽  
Vol 219 (3) ◽  
pp. 1005-1017 ◽  
Author(s):  
Catherine J. Collier ◽  
Lucas Langlois ◽  
Yan Ow ◽  
Charlotte Johansson ◽  
Manuela Giammusso ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Ocean Acidification ◽  
Positive Effects ◽  
Local Pressures

scholarly journals Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry

2021 ◽  
Vol 7 (2) ◽  
pp. eaba9958
Author(s):  
Maxence Guillermic ◽  
Louise P. Cameron ◽  
Ilian De Corte ◽  
Sambuddha Misra ◽  
Jelle Bijma ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Ocean Acidification ◽  
Pocillopora Damicornis ◽  
Carbonate Chemistry ◽  
Negative Interaction ◽  
Saturation State ◽  
Stylophora Pistillata ◽  
Coral Calcification ◽  
Influence Of Temperature On ◽  
Different Time Scales

The combination of thermal stress and ocean acidification (OA) can more negatively affect coral calcification than an individual stressors, but the mechanism behind this interaction is unknown. We used two independent methods (microelectrode and boron geochemistry) to measure calcifying fluid pH (pHcf) and carbonate chemistry of the corals Pocillopora damicornis and Stylophora pistillata grown under various temperature and pCO2 conditions. Although these approaches demonstrate that they record pHcf over different time scales, they reveal that both species can cope with OA under optimal temperatures (28°C) by elevating pHcf and aragonite saturation state (Ωcf) in support of calcification. At 31°C, neither species elevated these parameters as they did at 28°C and, likewise, could not maintain substantially positive calcification rates under any pH treatment. These results reveal a previously uncharacterized influence of temperature on coral pHcf regulation—the apparent mechanism behind the negative interaction between thermal stress and OA on coral calcification.

scholarly journals Ocean acidification reverses the positive effects of seawater pH fluctuations on growth and photosynthesis of the habitat-forming kelp, Ecklonia radiata

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Damon Britton ◽  
Christopher E. Cornwall ◽  
Andrew T. Revill ◽  
Catriona L. Hurd ◽  
Craig R. Johnson
Keyword(s):  
Ocean Acidification ◽  
Ecklonia Radiata ◽  
Positive Effects ◽  
Seawater Ph ◽  
Ph Fluctuations
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