Compositional variability in a cold-water scleractinian, Lophelia pertusa : new insights into “vital effects”
Cohen, Anne L.
Gaetani, Glenn A.
Corliss, Bruce H.
George, Robert Y.
MetadataShow full item record
We analyzed Sr/Ca and Mg/Ca ratios in the thecal wall of Lophelia pertusa, a cold-water coral, using SIMS ion microprobe techniques. The wall grows by simultaneous upward extension and outward thickening. Compositional variability displays similar trends along the upward and outward growth axes. Sr/Ca and Mg/Ca ratios oscillate systematically and inversely. The sensitivity of Lophelia Sr/Ca ratios to the annual temperature cycle (−0.18 mmol · mol−1/°C) is twice as strong as that exhibited by tropical reef corals, and four times as strong as the temperature dependence of Sr/Ca ratios of abiogenic aragonites precipitated experimentally from seawater. A comparison of the skeletal composition of Lophelia with results from precipitation calculations carried out using experimentally determined partition coefficients suggests that both temperature-dependent element partitioning and seasonal changes in the mass fraction of aragonite precipitated from the calcifying fluid influence the composition of Lophelia skeleton. Results from calculations that combine these effects reproduce both the exaggerated amplitude of the Sr/Ca and Mg/Ca oscillations and the inverse relationship between Sr/Ca and Mg/Ca ratios.
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 7 (2006): Q12004, doi:10.1029/2006GC001354.
Showing items related by title, author, creator and subject.
On the effective capacity of the dense-water reservoir for the Nordic Seas overflow : some effects of topography and wind stress Yang, Jiayan; Pratt, Lawrence J. (American Meteorological Society, 2013-02)The overflow of the dense water mass across the Greenland–Scotland Ridge (GSR) from the Nordic Seas drives the Atlantic meridional overturning circulation (AMOC). The Nordic Seas is a large basin with an enormous reservoir ...
Snail grazing effects on the composition and metabolism of benthic diatom communities and subsequent effects on fish growth Connor, Michael Stewart (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1980-06)Eastern mud snails (Ilyanassa obsoleta) in densities of zero, six or twelve snails were placed in flow-through-laboratory microcosms (765 cm2) and incubated for five weeks. Other tanks were raked daily to a depth of 10 ...
Interactions among resource partitioning, sampling effect, and facilitation on the biodiversity effect : a modeling approach Flombaum, Pedro; Sala, Osvaldo E.; Rastetter, Edward B. (2013-08-21)Resource partitioning, facilitation, and sampling effect are the three mechanisms behind the biodiversity effect, which is depicted usually as the effect of plant-species richness on aboveground net primary production. ...