Boron isotope composition and seawater characteristics of cold water scleratinian corals


Autoria(s): McCulloch, Malcolm; Trotter, Julie; Montagna, Paolo; Falter, Jim; Dunbar, Robert G; Freiwald, André; Försterra, Günter; López Correa, Matthias; Maier, Cornelia; Rüggeberg, Andres; Taviani, Marco
Cobertura

MEDIAN LATITUDE: 6.437453 * MEDIAN LONGITUDE: 26.423044 * SOUTH-BOUND LATITUDE: -44.328330 * WEST-BOUND LONGITUDE: -163.136180 * NORTH-BOUND LATITUDE: 64.108830 * EAST-BOUND LONGITUDE: 147.280000 * DATE/TIME START: 1997-01-01T00:00:00 * DATE/TIME END: 2006-10-15T07:11:00

Data(s)

26/06/2012

Resumo

The boron isotope systematics has been determined for azooxanthellate scleractinian corals from a wide range of both deep-sea and shallow-water environments. The aragonitic coral species, Caryophyllia smithii, Desmophyllum dianthus, Enallopsammia rostrata, Lophelia pertusa, and Madrepora oculata, are all found to have relatively high d11B compositions ranging from 23.2 per mil to 28.7 per mil. These values lie substantially above the pH-dependent inorganic seawater borate equilibrium curve, indicative of strong up-regulation of pH of the internal calcifying fluid (pH(cf)), being elevated by ~0.6-0.8 units (Delta pH) relative to ambient seawater. In contrast, the deep-sea calcitic coral Corallium sp. has a significantly lower d11B composition of 15.5 per mil, with a corresponding lower Delta pH value of ~0.3 units, reflecting the importance of mineralogical control on biological pH up-regulation. The solitary coral D. dianthus was sampled over a wide range of seawater pH(T) and shows an approximate linear correlation with Delta pH(Desmo) = 6.43 - 0.71 pH(T) (r**2 = 0.79). An improved correlation is however found with the closely related parameter of seawater aragonite saturation state, where Delta pH(Desmo) = 1.09 - 0.14 Omega(arag) (r**2 = 0.95), indicating the important control that carbonate saturation state has on calcification. The ability to up-regulate internal pH(cf), and consequently Omega(cf), of the calcifying fluid is therefore a process present in both azooxanthellate and zooxanthellate aragonitic corals, and is attributed to the action of Ca2+ -ATPase in modulating the proton gradient between seawater and the site of calcification. These findings also show that the boron isotopic compositions (d11Bcarb) of aragonitic corals are highly systematic and consistent with direct uptake of the borate species within the biologically controlled extracellular calcifying medium.

Formato

application/zip, 2 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.816120

doi:10.1594/PANGAEA.816120

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: McCulloch, Malcolm; Trotter, Julie; Montagna, Paolo; Falter, Jim; Dunbar, Robert G; Freiwald, André; Försterra, Günter; López Correa, Matthias; Maier, Cornelia; Rüggeberg, Andres; Taviani, Marco (2012): Resilience of cold-water scleractinian corals to ocean acidification: Boron isotopic systematics of pH and saturation state up-regulation. Geochimica et Cosmochimica Acta, 87, 21-34, doi:10.1016/j.gca.2012.03.027

Palavras-Chave #2sem; Alkalinity, total; Aragonite saturation state; Aragonite saturation state, standard deviation; Area; Area/locality; AT; C. smithii d11B; Calcite saturation state; Calcite saturation state, standard deviation; Caryophyllia smithii, d11B; Corallium sp., d11B; Corallium sp. d11B; D. dianthus d11B; Desmophyllum dianthus, d11B; D pH; E. rostrata d11B; Elevation; ELEVATION; Elevation, maximum; Elevation, minimum; Elev max; Elev min; Enallopsammia rostrata, d11B; Event; HERMIONE; Hotspot Ecosystem Research and Mans Impact On European Seas; internal fluid; International Polar Year (2007-2008); IPY; L. pertusa d11B; Lophelia pertusa, d11B; M. oculata d11B; Madrepora oculata, d11B; Omega Arg; Omega Arg std dev; Omega Cal; Omega Cal std dev; Parameter; pH; pH change; Reference; Reference/source; Sal; Salinity; Sample ID; seawater; Species; Temp; Temperature, water
Tipo

Dataset