title: Evidence of lead biomagnification in invertebrate predators from laboratory and field experiments.
abstract: This report includes atomic absorption data from water column, elutriates and zooplankton that demonstrate that lead biomagnifies at El Niágara reservoir, Mexico. Results include field data (bioaccumulation factors) (BAFs) and laboratory data (bioconcentration factors) (BCFs). Two findings: high BAFs for invertebrate predator like Acanthocyclops robustus, Asplanchna brightwellii, Culex sp. larvae, and Hyalella azteca, compared to grazer species Moina micrura and Simocephalus vetulus; low BCF's found for some predators, suggested that lead biomagnifications were taking place. The presence of Moina micrura in the gut of Asplanchna allowed us to design experiments where A. brightwellii was fed lead-exposed M. micrura neonates. The BAF of Asplanchna was 123,684, BCF was 490. Asplanchna individuals fed exposed Moina had 13.31 times more lead than Asplanchna individuals just exposed 48-h to lead, confirming that lead biomagnification occurs. Results of two fish species showed no lead biomagnification, suggesting that lead biomagnification might be restricted to invertebrate predators.
authors.affiliation: Departamento de Química, Centro de Ciencias Básicas, Universidad Autónoma de Aguascalientes, Avenida Universidad 940, CP 20131 Aguascalientes, Mexico.
authors.forename: Isidoro
authors.initials: I
authors.lastname: Rubio-Franchini
authors.forename: Roberto
authors.initials: R
authors.lastname: Rico-Martínez
mesh_terms: D000818:Animals; D020387:Food Chain; D007448:Invertebrates / Q000737:chemistry / Q000502:physiology*; D007854:Lead / Q000032:analysis / Q000378:metabolism*; D008800:Mexico; D011235:Predatory Behavior; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*; D015048:Zooplankton / Q000737:chemistry / Q000378:metabolism
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead