Resumen de Respuesta de la productividad biológica marina al cambio climático: registro de alta resolución de la cuenca del mar de Alborán
Francisca Martínez Ruiz, José María González Donoso, Dolores Linares, Francisco José Jiménez Espejo, David Gallego Torres, O. Romero, Adina Paytan
The use of excess Ba content derived from marine barite as a productivity proxy in the Alboran seabasin has revealed significant fluctuations within this basin since the Last Glacial Maximum. This proxy is based on the strong correlation between the fluxes of excess Ba derived from marine bariteand water column productivity. In the eastern Mediterranean, paleoproductivity reconstructions using this proxy and other oxygen and sedimentary regime proxies have demonstrated that widespread deposition of sapropels resulted from enhanced export production fluxes, being increasing productivity a consequence of changes in climatic conditions leading to higher nutrient supply. Although organic-rich layers (ORLs) are recognized in the western Mediterranean, such layers were not always deposited at equivalent sapropel-time periods. For the particular case of the most recents apropel (SI), significant changes in productivity are not recognized in the Alboran Sea basin buta decreasing trend in export production fluxes since the deposition of the last ORL. Maximumlevels in productivity are recognized instead during the Younger Dryas, evidencing major regional differences across Mediterranean basins and also through time in response to climate change.
