versión On-line ISSN 0717-6538
MUNOZ, Práxedes y SALAMANCA, Marco. FLUX OF PARTICULATE LEAD TO MARINE SEDIMENTS AND ITS ACCUMULATION IN PARAPRIONOSPIO PINNATA (POLYCHAETA: SPIONIDAE) IN CONCEPCION BAY (36° Lat.S), CHILE. Gayana (Concepc.) [online]. 2001, vol.65, n.2, pp.155-166. ISSN 0717-6538. http://dx.doi.org/10.4067/S0717-65382001000200007.
Concepción Bay (36° Lat. S) is located in the heart of the most industrialized coastal zone of Chile, owing also an intense commercial and fishing harbor activity. Its high productivity, driven by the occurrence of seasonal coastal upwelling causes a high flux of particulate material to the sediments. Lead (Pb) is a highly insoluble, particle-reactive element and hence rapidly reaches benthic communities. The main objective of this study was to determine the Pb concentration in particulate material and also in the marine worm Paraprionospio pinnata, a deposit-feeder organism, being the most representative of benthic fauna of Concepción Bay. To do that, two traps were moored at the interior and at the entrance of bay for 15 days. The organism were collected in four stations along a transect through the outer bay. The samplings were carried out in two periods: August 1997 and March 1998 corresponding to relaxation and intensification of upwelling, respectively. The Pb concentrations in the polychaetes indicate that they are responding to Pb flux variations, being particulate material intake the main Pb input. According to the circulation patterns of the bay, a net Pb flux of ~10 mg cm-2 yr-1 was estimated
Palabras clave : Pb; fluxes; bioaccumulation; particulate material; sediments; Concepción Bay; Chile.