Artículo de revista
Temporal changes in phytoplankton productivity over the last ∼200 years recorded from mejillones bay laminated sediments Sedimentos laminados de la bahía mejillones como registro de cambios temporales en la productividad fitoplanctónica de los últimos ∼20
Fecha
2009Registro en:
Revista Chilena de Historia Natural, Volumen 82, Issue 1, 2018, Pages 83-96
0716078X
07176317
Autor
Caniupán, Magaly
Villaseñor, Tania
Pantoja, Silvio
Lange, Carina B.
Vargas, Gabriel
Muñoz, Práxedes
Salamanca, Marco
Institución
Resumen
We analyzed the contents of total organic carbon, biogenic opal, chlorins, and alkenones (as productivity proxies) from a laminated sediment core recovered within Bahía Mejillones, northern Chile, in order to reconstruct recent temporal changes in phytoplankton productivity. Physical parameters (water content, dry bulk density, magnetic susceptibility, X-radiography, and grey scale intensity) were also used to characterize the sediments. A sedimentation rate of 0.18 cm year -1 (based on 210Pb measurements) was determined for the core (Core 3; 23°03' S, 70°27' W), which was recovered with a box-corer (water column depth: 80 m). By extrapolating this sedimentation rate to the base of the core, it yielded a total age of ∼223 years. The sediments were characterized by a succession of light and dark millimetre-thick laminae, which differed in both physical properties and composition; the denser dark laminae had less water content and represented periods of increased phytoplankton productivi