Responses of two scleractinian corals to cobalt pollution and ocean acidification
The effects of ocean acidification alone or in combination with warming on coral metabolism have been extensively investigated, whereas none of these studies consider that most coral reefs near shore are already impacted by other natural anthropogenic inputs such as metal pollution. It is likely tha...
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ftird:oai:ird.fr:fdi:010064138 2023-05-15T17:49:57+02:00 Responses of two scleractinian corals to cobalt pollution and ocean acidification Biscere, T. Rodolfo-Metalpa, Riccardo Lorrain, Anne Chauvaud, L. Thebault, J. Clavier, J. Houlbrèque, Fanny NOUVELLE CALEDONIE 2015 text/pdf http://www.documentation.ird.fr/hor/fdi:010064138 EN eng http://www.documentation.ird.fr/hor/fdi:010064138 oai:ird.fr:fdi:010064138 Biscere T., Rodolfo-Metalpa Riccardo, Lorrain Anne, Chauvaud L., Thebault J., Clavier J., Houlbrèque Fanny. Responses of two scleractinian corals to cobalt pollution and ocean acidification. Plos One, 2015, 10 (4), p. e0122898 [18 p.]. text 2015 ftird 2020-08-21T06:52:45Z The effects of ocean acidification alone or in combination with warming on coral metabolism have been extensively investigated, whereas none of these studies consider that most coral reefs near shore are already impacted by other natural anthropogenic inputs such as metal pollution. It is likely that projected ocean acidification levels will aggravate coral reef health. We first investigated how ocean acidification interacts with one near shore locally abundant metal on the physiology of two major reef-building corals: Stylophora pistillata and Acropora muricata. Two pH levels (pH(T) 8.02; pCO(2) 366 mu atm and pH(T) 7.75; pCO(2) 1140 mu atm) and two cobalt concentrations (natural, 0.03 mu g L-1 and polluted, 0.2 mu g L-1) were tested during five weeks in aquaria. We found that, for both species, cobalt input decreased significantly their growth rates by 28% while it stimulated their photosystem II, with higher values of rETR(max) (relative Electron Transport Rate). Elevated pCO(2) levels acted differently on the coral rETR(max) values and did not affect their growth rates. No consistent interaction was found between pCO(2) levels and cobalt concentrations. We also measured in situ the effect of higher cobalt concentrations (1.06 +/- 0.16 mu g L-1) on A. muricata using benthic chamber experiments. At this elevated concentration, cobalt decreased simultaneously coral growth and photosynthetic rates, indicating that the toxic threshold for this pollutant has been reached for both host cells and zooxanthellae. Our results from both aquaria and in situ experiments, suggest that these coral species are not particularly sensitive to high pCO(2) conditions but they are to ecologically relevant cobalt concentrations. Our study reveals that some reefs may be yet subjected to deleterious pollution levels, and even if no interaction between pCO(2) levels and cobalt concentration has been found, it is likely that coral metabolism will be weakened if they are subjected to additional threats such as temperature increase, other heavy metals, and eutrophication. Text Ocean acidification IRD (Institute de recherche pour le développement): Horizon |
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The effects of ocean acidification alone or in combination with warming on coral metabolism have been extensively investigated, whereas none of these studies consider that most coral reefs near shore are already impacted by other natural anthropogenic inputs such as metal pollution. It is likely that projected ocean acidification levels will aggravate coral reef health. We first investigated how ocean acidification interacts with one near shore locally abundant metal on the physiology of two major reef-building corals: Stylophora pistillata and Acropora muricata. Two pH levels (pH(T) 8.02; pCO(2) 366 mu atm and pH(T) 7.75; pCO(2) 1140 mu atm) and two cobalt concentrations (natural, 0.03 mu g L-1 and polluted, 0.2 mu g L-1) were tested during five weeks in aquaria. We found that, for both species, cobalt input decreased significantly their growth rates by 28% while it stimulated their photosystem II, with higher values of rETR(max) (relative Electron Transport Rate). Elevated pCO(2) levels acted differently on the coral rETR(max) values and did not affect their growth rates. No consistent interaction was found between pCO(2) levels and cobalt concentrations. We also measured in situ the effect of higher cobalt concentrations (1.06 +/- 0.16 mu g L-1) on A. muricata using benthic chamber experiments. At this elevated concentration, cobalt decreased simultaneously coral growth and photosynthetic rates, indicating that the toxic threshold for this pollutant has been reached for both host cells and zooxanthellae. Our results from both aquaria and in situ experiments, suggest that these coral species are not particularly sensitive to high pCO(2) conditions but they are to ecologically relevant cobalt concentrations. Our study reveals that some reefs may be yet subjected to deleterious pollution levels, and even if no interaction between pCO(2) levels and cobalt concentration has been found, it is likely that coral metabolism will be weakened if they are subjected to additional threats such as temperature increase, other heavy metals, and eutrophication. |
format |
Text |
author |
Biscere, T. Rodolfo-Metalpa, Riccardo Lorrain, Anne Chauvaud, L. Thebault, J. Clavier, J. Houlbrèque, Fanny |
spellingShingle |
Biscere, T. Rodolfo-Metalpa, Riccardo Lorrain, Anne Chauvaud, L. Thebault, J. Clavier, J. Houlbrèque, Fanny Responses of two scleractinian corals to cobalt pollution and ocean acidification |
author_facet |
Biscere, T. Rodolfo-Metalpa, Riccardo Lorrain, Anne Chauvaud, L. Thebault, J. Clavier, J. Houlbrèque, Fanny |
author_sort |
Biscere, T. |
title |
Responses of two scleractinian corals to cobalt pollution and ocean acidification |
title_short |
Responses of two scleractinian corals to cobalt pollution and ocean acidification |
title_full |
Responses of two scleractinian corals to cobalt pollution and ocean acidification |
title_fullStr |
Responses of two scleractinian corals to cobalt pollution and ocean acidification |
title_full_unstemmed |
Responses of two scleractinian corals to cobalt pollution and ocean acidification |
title_sort |
responses of two scleractinian corals to cobalt pollution and ocean acidification |
publishDate |
2015 |
url |
http://www.documentation.ird.fr/hor/fdi:010064138 |
op_coverage |
NOUVELLE CALEDONIE |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://www.documentation.ird.fr/hor/fdi:010064138 oai:ird.fr:fdi:010064138 Biscere T., Rodolfo-Metalpa Riccardo, Lorrain Anne, Chauvaud L., Thebault J., Clavier J., Houlbrèque Fanny. Responses of two scleractinian corals to cobalt pollution and ocean acidification. Plos One, 2015, 10 (4), p. e0122898 [18 p.]. |
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