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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 |
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| Authors: | Julie Hermans Catherine Borremans Philippe Willenz Luc André Philippe Dubois |
| Institution: | 1. Marine Biology Laboratory, Université Libre de Bruxelles, CP 160/15, 50 Avenue F.D. Roosevelt, 1050, Brussels, Belgium 2. Department of Invertebrates, Royal Belgian Institute of Natural Sciences, 29 Rue Vautier, Brussels, 1000, Belgium 3. Section of Petrography-Mineralogy-Geochemisty, Royal Museum of Central Africa, 13 Leuvenstesteenweg, Tervuren, 3080, Belgium |
| Abstract: | 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 effect 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 field 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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