Biochemical responses to ocean acidification contrast between tropical corals with high and low abundances at volcanic carbon dioxide seeps

Strahl, J, Francis, D. S, Doyle, J, Humphrey, C and Fabricius, K. E. 2016, Biochemical responses to ocean acidification contrast between tropical corals with high and low abundances at volcanic carbon dioxide seeps, ICES Journal of marine science: journal du conseil, vol. 73, no. 3, pp. 897-909, doi: 10.1093/icesjms/fsv194.

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Title Biochemical responses to ocean acidification contrast between tropical corals with high and low abundances at volcanic carbon dioxide seeps
Author(s) Strahl, J
Francis, D. SORCID iD for Francis, D. S
Doyle, J
Humphrey, C
Fabricius, K. E.
Journal name ICES Journal of marine science: journal du conseil
Volume number 73
Issue number 3
Start page 897
End page 909
Total pages 13
Publisher Oxford University Press
Place of publication Oxford, Eng.
Publication date 2016-02-01
ISSN 1095-9289
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Physical Sciences
Marine & Freshwater Biology
energy storage
fatty acids
lipid classes
ocean acidification
oxidative stress
volcanic carbon dioxide seeps
Summary At two natural volcanic seeps in Papua New Guinea, the partial pressure of carbon dioxide (pCO2) in the seawater is consistent with projections for 2100. Here, the cover of massive scleractinian corals Porites spp. is twice as high at elevated compared with ambient pCO2, while that of branching corals such as Acropora millepora is greater than twofold reduced. To assess the underlying mechanisms for such community shifts under long-term exposure to elevated pCO2, biochemical parameters related to tissue biomass, energy storage, pigmentation, cell protection, and cell damage were compared between Porites spp. and A. millepora from control (mean pHtotal = 8.1, pCO2 = 323 µatm) and CO2 seep sites (mean pHtotal = 7.8, pCO2 = 803 µatm) each at two reefs. In Porites spp., only one of the biochemical parameters investigated (the ratio of photoprotective to light-harvesting pigments) responded to pCO2, while tissue biomass, total lipids, total proteins, and some pigments differed between the two reefs, possibly reflecting differences in food availability. Furthermore, some fatty acids showed pCO2 –reef interactions. In A. millepora, most pigments investigated were reduced at elevated pCO2, while other parameters (e.g. tissue biomass, total proteins, total lipids, protein carbonyls, some fatty acids and pigments) differed between reefs or showed pCO2–reef interactions. Tissue biomass, total lipids, and cell-protective capacities were distinctly higher in Porites spp. than in A. millepora, indicating higher resistance to environmental stress in massive Porites. However, our data suggest that important biochemical measures remain relatively unaffected in these two coral species in response to elevated pCO2 up to 800 µatm, with most responses being smaller than differences between species and locations, and also when compared with responses to other environmental stressors such as ocean warming.
Language eng
DOI 10.1093/icesjms/fsv194
Field of Research 050101 Ecological Impacts of Climate Change
070402 Aquatic Ecosystem Studies and Stock Assessment
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
MD Multidisciplinary
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
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