Depth-dependant response to light of the reef building coral, Pocillopora verrucosa: implication of oxidative stress
Depth-dependant response to light of the reef building coral, Pocillopora verrucosa: implication of oxidative stress
Several environmental factors have been described to trigger bleaching in cnidarian/dinoflagellate endosymbiosis. However, the molecular mechanisms underlying this process still need more investigations. Symbiosis breakdown is known to result from physiological damage to animal host cells and/or symbionts. Cellular oxidation appears to be an essential player in this damage. Indeed, oxidative stress is a direct consequence of increase in irradiance and temperature, the two main environmental factors involved in bleaching. In this study, we examined the role of irradiance in inducing dissociation and oxidative stress in cnidarians and dinoflagellates. We used the bleaching-sensitive scleractinian coral Pocillopora verrucosa in a field cross-transplantation experiment performed between 5 m and 20 m depth at Grande Glorieuse Island (Indian Ocean), a preserved area subject to minimal anthropogenic influence. Cellular damage and increase in antioxidant defense were correlated with bleaching in upward transplanted samples. Downward transplanted colonies presented no associated alterations similar to the controls. We therefore conclude that increasing light induced bleaching via a prooxidative period. Remarkably, the distribution of Symbiodinium over depth was invariant; all colonies were monomorph for clade C, suggesting that bleaching sensitivity of P. verrucosa might not be associated with clade specificity.
Antioxidant defenses, Bleaching, Cnidarian, Mozambique channel, Symbiodinium, Symbiosis, Transplantation experiment, Western Indian Ocean, Channel
48-56
Richier, Sophie
0fc0b375-6918-4c06-9d6f-229f6c4046ca
Cottalorda, Jean-Michel
a75d9114-6b6a-498f-a295-23cdfb796b5a
Guillaume, Mireille M.M.
26f0ec01-53e9-449a-8d16-3884af46cd39
Fernandez, Cyril
35b60b55-b3f5-4fae-aa62-f1692c071f60
Allemand, Denis
a9a9145a-9129-4827-83ae-f204d180d945
Furla, Paola
d3e7b181-371a-4a7a-8749-594e704d10d7
17 March 2008
Richier, Sophie
0fc0b375-6918-4c06-9d6f-229f6c4046ca
Cottalorda, Jean-Michel
a75d9114-6b6a-498f-a295-23cdfb796b5a
Guillaume, Mireille M.M.
26f0ec01-53e9-449a-8d16-3884af46cd39
Fernandez, Cyril
35b60b55-b3f5-4fae-aa62-f1692c071f60
Allemand, Denis
a9a9145a-9129-4827-83ae-f204d180d945
Furla, Paola
d3e7b181-371a-4a7a-8749-594e704d10d7
Richier, Sophie, Cottalorda, Jean-Michel, Guillaume, Mireille M.M., Fernandez, Cyril, Allemand, Denis and Furla, Paola
(2008)
Depth-dependant response to light of the reef building coral, Pocillopora verrucosa: implication of oxidative stress.
Journal of Experimental Marine Biology and Ecology, 357 (1), .
(doi:10.1016/j.jembe.2007.12.026).
Abstract
Several environmental factors have been described to trigger bleaching in cnidarian/dinoflagellate endosymbiosis. However, the molecular mechanisms underlying this process still need more investigations. Symbiosis breakdown is known to result from physiological damage to animal host cells and/or symbionts. Cellular oxidation appears to be an essential player in this damage. Indeed, oxidative stress is a direct consequence of increase in irradiance and temperature, the two main environmental factors involved in bleaching. In this study, we examined the role of irradiance in inducing dissociation and oxidative stress in cnidarians and dinoflagellates. We used the bleaching-sensitive scleractinian coral Pocillopora verrucosa in a field cross-transplantation experiment performed between 5 m and 20 m depth at Grande Glorieuse Island (Indian Ocean), a preserved area subject to minimal anthropogenic influence. Cellular damage and increase in antioxidant defense were correlated with bleaching in upward transplanted samples. Downward transplanted colonies presented no associated alterations similar to the controls. We therefore conclude that increasing light induced bleaching via a prooxidative period. Remarkably, the distribution of Symbiodinium over depth was invariant; all colonies were monomorph for clade C, suggesting that bleaching sensitivity of P. verrucosa might not be associated with clade specificity.
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Published date: 17 March 2008
Keywords:
Antioxidant defenses, Bleaching, Cnidarian, Mozambique channel, Symbiodinium, Symbiosis, Transplantation experiment, Western Indian Ocean, Channel
Organisations:
Ocean Biochemistry & Ecosystems
Identifiers
Local EPrints ID: 341914
URI: http://eprints.soton.ac.uk/id/eprint/341914
ISSN: 0022-0981
PURE UUID: 54c76c0a-31e1-48fd-bcc6-5aa14c4e5772
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Date deposited: 10 Aug 2012 13:07
Last modified: 14 Mar 2024 11:45
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Author:
Sophie Richier
Author:
Jean-Michel Cottalorda
Author:
Mireille M.M. Guillaume
Author:
Cyril Fernandez
Author:
Denis Allemand
Author:
Paola Furla
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