Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/18730
Title: Factors controlling Hg levels in two predatory fish species in the Negro river basin, Brazilian Amazon
Authors: Belger, Lauren
Forsberg, Bruce Rider
Keywords: Biodiversity
Concentration (process)
Ecosystems
Environmental Impact
Ph Effects
Soils
Amazon
Bioaccumulation
Dissolved Organic Carbon (doc)
Fish
Methylation
River Pollution
Dissolved Organic Matter
Mercury
Organic Carbon
Aquatic Ecosystem
Bioaccumulation
Fish
Mercury (element)
Predator
Animals Experiment
Brasil
Carnivory
Chemical Analysis
Controlled Study
Environmental Factor
Fish
Flooding
Floodplain
Forest
Geography
Methylation
Nonhuman
Ph
Priority Journal
River Basin
Soil
Telecommunication
Water Sampling
Animal
Brasil
Environmental Monitoring
Fishes
Food Chain
Hydrogen-ion Concentration
Mercury
Muscle, Skeletal
Rivers
Soil Pollutants
Water Pollutants, Chemical
Amazonas
Brasil
Rio Negro [south America]
South America
Cichla
Hoplias Malabaricus
Pisces
Issue Date: 2006
metadata.dc.publisher.journal: Science of the Total Environment
metadata.dc.relation.ispartof: Volume 367, Número 1, Pags. 451-459
Abstract: A number of environmental factors have been shown to influence the dynamics of Hg in aquatic ecosystems. Here we investigate the influence of fish size, pH, dissolved organic carbon (DOC), and the availability of potential methylation sites (floodplain forests and hydromorphic soils) on the concentration of total Hg in two carnivorous fishes: Cichla spp. and Hoplias malabaricus in the Negro River, Brazil. Fish and water samples for chemical analysis were collected from 33 sites in the Negro basin. The percentage of alluvial floodplains and hydromorphic soils (potential methylation sites) in the drainage basin upstream from each sampling point was estimated from radar imagery and existing soil maps with GIS. The average of Hg concentrations were 0.337 ppm (SD = 0.244) in Cichla spp. and 0.350 ppm (SD = 0.250) in H. malabaricus. Although the study area was geographically isolated from most major anthropogenic Hg sources, over 18% of Cichla spp. and 29% of H. malabaricus had Hg concentrations above 0.5 ppm, indicating naturally high background levels of Hg. Hg concentrations increased with size in both Cichla spp. (r2 = 0.664, p = 0.000) and H. malabaricus (r2 = 0.299, p = 0.000). Hg concentrations in H. malabaricus also increased with percent floodable area (p = 0.006), pH (p = 0.000) and DOC (0,063). In Cichla spp, Hg increased only in relation to percent floodable area (p = 0.000). Hydromorphic soils did not influence fish Hg. © 2006 Elsevier B.V. All rights reserved.
metadata.dc.identifier.doi: 10.1016/j.scitotenv.2006.03.033
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