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516438 
Journal Article 
Determination of lead in samples of zooplankton, water, and sediments in a Mexican reservoir: Evidence for lead biomagnification in lower/intermediate trophic levels? 
Rubio-Franchini, I; Saavedra, JM; Rico-Martinez, R 
2008 
Yes 
Environmental Toxicology
ISSN: 1520-4081
EISSN: 1522-7278 
23 
459-465 
English 
We have determined lead concentration of water, sediment, and zooplankton samples of El Niagara, a reservoir in Aguascalientes, Mexico. Our results include the first report of bioconcentration factor (BCF) obtained in an actual ecosystem (as opposed to the experimental setups in the laboratory) for a rotifer species; Asplanchna brigthwellii (BCF ca. 49 300). The BCF of this predatory zooplanktonic species (A. brigthwellii) are up to four times greater than those of two grazing zooplanktonic species (Daphnia similis and Moina micrura). In this contaminated reservoir that lacks fishes, Asplanchna, and Culex sp. together with ducks and other bigger invertebrates might represent the top predators. Our data suggest that biomagnification of lead through at least one trophic level can occur in freshwater systems. Biomagnification in A. brigthwellii might be explained in part by predation of this voracious predator on young of the herbivorous cladoceran, M. micrura. Our findings stand opposite to the current theoretical framework where lead biomagnification occurs only in lower trophic levels. (C) 2008 Wiley Periodicals, Inc. 
metal toxicity; bioconcentration factors; heavy metal toxicity; lead; accumulation; brachionus-calyciflorus; food-web; bioaccumulation; toxicity; aguascalientes; accumulation; metals; lakes 
IRIS
• Trimethylbenzenes (TMB)
NAAQS
• ISA-Lead (2013 Final Project Page)
     Considered
     Cited
          1st Draft
          2nd Draft
          3rd Draft
          Final
     Eco/Welfare
          Aquatic Effects
          Terrestrial Effects