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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 M; Fink, A; Hofmann, L C; de Beer, D; Fabricius, K E.
Afiliação
  • Wall M; GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany.
  • Fietzke J; GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany.
  • Schmidt GM; Alfred-Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany.
  • Fink A; Max-Planck Institute for Marine Microbiology, Bremen, Germany.
  • Hofmann LC; Marine Botany, Bremen Center for Marine Research and Education, University of Bremen, Germany.
  • de Beer D; Max-Planck Institute for Marine Microbiology, Bremen, Germany.
  • Fabricius KE; Max-Planck Institute for Marine Microbiology, Bremen, Germany.
Sci Rep ; 6: 30688, 2016 08 01.
Article em En | MEDLINE | ID: mdl-27477963
ABSTRACT
The resilience of tropical corals to ocean acidification depends on their ability to regulate the pH within their calcifying fluid (pHcf). Recent work suggests pHcf homeostasis under short-term exposure to pCO2 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' pHcf (using boron isotopes). Porites maintained a similar pHcf (~8.24) at both a control (pH 8.1) and seep-influenced site (pH 7.9). Internal pHcf 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 pHcf 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 pHcf represents a key mechanism to persist in future oceans. Only beyond end-of-century pCO2 conditions do they face their current physiological limit of pH homeostasis and pHcf begins to decrease.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água do Mar / Dióxido de Carbono / Antozoários / Aclimatação / Homeostase Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Sci Rep Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Alemanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água do Mar / Dióxido de Carbono / Antozoários / Aclimatação / Homeostase Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Sci Rep Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Alemanha