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  Internal pH regulation facilitates in situ long-term acclimation of massive corals to end-of-century carbon dioxide conditions

Wall, M., Fietzke, J., Schmidt, G., Fink, A., Hofmann, L., de Beer, D., et al. (2016). Internal pH regulation facilitates in situ long-term acclimation of massive corals to end-of-century carbon dioxide conditions. Scientific Reports, 6: 30688, pp. 1-7.

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Wall, M., Author
Fietzke, J., Author
Schmidt, G., Author
Fink, A.1, Author           
Hofmann, L.1, Author           
de Beer, D.1, Author           
Fabricius, K., Author
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1Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481711              

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 Abstract: The resilience of tropical corals to ocean acidification depends on their ability to regulate the pH within their calcifying fluid (pH(cf)). Recent work suggests pHcf homeostasis under short-term exposure to pCO(2) conditions predicted for 2100, but it is still unclear if pHcf homeostasis can be maintained throughout a corals lifetime. At CO2 seeps in Papua New Guinea, massive Porites corals have grown along a natural seawater pH gradient for decades. This natural gradient, ranging from pH 8.1-7.4, provides an ideal platform to determine corals' pH(cf) (using boron isotopes). Porites maintained a similar pH(cf) (similar to 8.24) at both a control (pH 8.1) and seep-influenced site (pH 7.9). Internal pH(cf) was slightly reduced (8.12) at seawater pH 7.6, and decreased to 7.94 at a site with a seawater pH of 7.4. A growth response model based on pH(cf) mirrors the observed distribution patterns of this species in the field. We suggest Porites has the capacity to acclimate after long-time exposure to end-of-century reduced seawater pH conditions and that strong control over pH(cf) represents a key mechanism to persist in future oceans. Only beyond end-of-century pCO(2) conditions do they face their current physiological limit of pH homeostasis and pH(cf) begins to decrease.

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Language(s): eng - English
 Dates: 2016-08-01
 Publication Status: Issued
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 732657
ISI: 000380975400001
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 30688 Start / End Page: 1 - 7 Identifier: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322