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Allelopathic interactions between the brown algal genus Lobophora (Dictyotales, Phaeophyceae) and scleractinian corals

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Abstract
Allelopathy has been recently suggested as a mechanism by which macroalgae may outcompete corals in damaged reefs. Members of the brown algal genus Lobophora are commonly observed in close contact with scleractinian corals and have been considered responsible for negative effects of macroalgae to scleractinian corals. Recent field assays have suggested the potential role of chemical mediators in this interaction. We performed in situ bioassays testing the allelopathy of crude extracts and isolated compounds of several Lobophora species, naturally associated or not with corals, against four corals in New Caledonia. Our results showed that, regardless of their natural association with corals, organic extracts from species of the genus Lobophora are intrinsically capable of bleaching some coral species upon direct contact. Additionally, three new C-21 polyunsaturated alcohols named lobophorenols A-C (1-3) were isolated and identified. Significant all elopathic effects against Acropora muricata were identified for these compounds. In situ observations in New Caledonia, however, indicated that while allelopathic interactions are likely to occur at the macroalgal-coral interface, Lobophora spp. rarely bleached their coral hosts. These findings are important toward our understanding of the importance of allelopathy versus other processes such as herbivory in the interaction between macroalgae and corals in reef ecosystems.
Keywords
VARIEGATA PHAEOPHYCEAE, MASS-SPECTROMETRY, MARINE CHEMICAL ECOLOGY, URCHIN DIADEMA-ANTILLARUM, PHASE-SHIFTS, HARD CORAL, REEF, MACROALGAE, SEAWEED, DEFENSE, LOBOPHORA

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Chicago
Vieira, Christophe, Olivier P Thomas, Gérald Culioli, Grégory Genta-Jouve, Fanny Houlbreque, Julie Gaubert, Olivier De Clerck, and Claude E Payri. 2016. “Allelopathic Interactions Between the Brown Algal Genus Lobophora (Dictyotales, Phaeophyceae) and Scleractinian Corals.” Scientific Reports 6.
APA
Vieira, Christophe, Thomas, O. P., Culioli, G., Genta-Jouve, G., Houlbreque, F., Gaubert, J., De Clerck, O., et al. (2016). Allelopathic interactions between the brown algal genus Lobophora (Dictyotales, Phaeophyceae) and scleractinian corals. SCIENTIFIC REPORTS, 6.
Vancouver
1.
Vieira C, Thomas OP, Culioli G, Genta-Jouve G, Houlbreque F, Gaubert J, et al. Allelopathic interactions between the brown algal genus Lobophora (Dictyotales, Phaeophyceae) and scleractinian corals. SCIENTIFIC REPORTS. 2016;6.
MLA
Vieira, Christophe, Olivier P Thomas, Gérald Culioli, et al. “Allelopathic Interactions Between the Brown Algal Genus Lobophora (Dictyotales, Phaeophyceae) and Scleractinian Corals.” SCIENTIFIC REPORTS 6 (2016): n. pag. Print.
@article{7151332,
  abstract     = {Allelopathy has been recently suggested as a mechanism by which macroalgae may outcompete corals in damaged reefs. Members of the brown algal genus Lobophora are commonly observed in close contact with scleractinian corals and have been considered responsible for negative effects of macroalgae to scleractinian corals. Recent field assays have suggested the potential role of chemical mediators in this interaction. We performed in situ bioassays testing the allelopathy of crude extracts and isolated compounds of several Lobophora species, naturally associated or not with corals, against four corals in New Caledonia. Our results showed that, regardless of their natural association with corals, organic extracts from species of the genus Lobophora are intrinsically capable of bleaching some coral species upon direct contact. Additionally, three new C-21 polyunsaturated alcohols named lobophorenols A-C (1-3) were isolated and identified. Significant all elopathic effects against Acropora muricata were identified for these compounds. In situ observations in New Caledonia, however, indicated that while allelopathic interactions are likely to occur at the macroalgal-coral interface, Lobophora spp. rarely bleached their coral hosts. These findings are important toward our understanding of the importance of allelopathy versus other processes such as herbivory in the interaction between macroalgae and corals in reef ecosystems.},
  articleno    = {18637},
  author       = {Vieira, Christophe and Thomas, Olivier P and Culioli, G{\'e}rald and Genta-Jouve, Gr{\'e}gory and Houlbreque, Fanny and Gaubert, Julie and De Clerck, Olivier and Payri, Claude E},
  issn         = {2045-2322},
  journal      = {SCIENTIFIC REPORTS},
  keyword      = {VARIEGATA PHAEOPHYCEAE,MASS-SPECTROMETRY,MARINE CHEMICAL ECOLOGY,URCHIN DIADEMA-ANTILLARUM,PHASE-SHIFTS,HARD CORAL,REEF,MACROALGAE,SEAWEED,DEFENSE,LOBOPHORA},
  language     = {eng},
  pages        = {11},
  title        = {Allelopathic interactions between the brown algal genus Lobophora (Dictyotales, Phaeophyceae) and scleractinian corals},
  url          = {http://dx.doi.org/10.1038/srep18637},
  volume       = {6},
  year         = {2016},
}

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