J. HERMANS, C. BORREMANS, Ph. WILLENZ, L. ANDRE, and Ph. DUBOIS (2010)
Temperature, salinity and growth rate dependences of Mg/Ca and Sr/Ca ratios of the skeleton of the sea urchin Paracentrotus lividus (Lamarck): an experimental approach
Marine Biology, 157:1293–1300.
The skeletal Mg/Ca ratio of echinoderms is
known to increase with temperature but the relation has
never been established in controlled experimental conditions.
The present study investigated the eVect of temperature,
salinity and growth rate on Mg/Ca and Sr/Ca ratios in
calcite skeletons of juvenile sea urchins grown in experimental
conditions. Mg/Ca ratio was positively related to
temperature, increasing until a plateau at high but Weld
occurring temperatures. It was not linked to salinity nor
growth rate. We suggest that this plateau is due to properties
of the organic matrix of mineralization and recommend
to take it into account for the use of Mg/Ca as proxy of
seawater Mg/Ca. Skeletal Sr/Ca ratio was mainly dependent
on temperature and growth rate, as usually observed in
calcite skeletons.
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