title: Toxicity and bioaccumulation of lead in marine protozoa communities.
abstract: The toxicity and bioaccumulation of lead has been studied using marine protozoa communities developed in laboratory microecosystems. The concentrations tested were 500 and 1000 micrograms.L-1 of lead as lead acetate. The protozoan was able to bioaccumulate 27.02-504 micrograms Pb.g-1 dry weight. Bacteria also bioaccumulated lead, but always to a lesser degree than protozoa. Lead caused a significant reduction in the density of protozoa, which could be an indirect response to the cellular increase of lead. On the other hand, the toxicant did not determine a decrease in the number of bacterial cells; this could be due to their capacity to bioaccumulate a lesser amount of lead, the increase in the number of dead cells, and the elimination of their predators by the toxicant. After 120 h, a recovery of the community was observed.
authors.affiliation: Departamento de Biología Animal I (Zoología), Facultad de Biología, Universidad Complutense, Madrid, Spain.
authors.forename: G
authors.initials: G
authors.lastname: Fernandez Leborans
authors.forename: Y
authors.initials: Y
authors.lastname: Olalla Herrero
authors.forename: A
authors.initials: A
authors.lastname: Novillo
mesh_terms: D000818:Animals; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism*; D018533:Biomass; D016798:Ciliophora / Q000187:drug effects* / Q000378:metabolism; D056890:Eukaryota / Q000187:drug effects* / Q000378:metabolism; D007854:Lead / Q000378:metabolism / Q000633:toxicity*; D012623:Seawater; D013030:Spain; D014874:Water Pollutants, Chemical / Q000378:metabolism / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead