Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/18730
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dc.contributor.authorBelger, Lauren-
dc.contributor.authorForsberg, Bruce Rider-
dc.date.accessioned2020-06-15T22:02:46Z-
dc.date.available2020-06-15T22:02:46Z-
dc.date.issued2006-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/18730-
dc.description.abstractA 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.en
dc.language.isoenpt_BR
dc.relation.ispartofVolume 367, Número 1, Pags. 451-459pt_BR
dc.rightsRestrito*
dc.subjectBiodiversityen
dc.subjectConcentration (process)en
dc.subjectEcosystemsen
dc.subjectEnvironmental Impacten
dc.subjectPh Effectsen
dc.subjectSoilsen
dc.subjectAmazonen
dc.subjectBioaccumulationen
dc.subjectDissolved Organic Carbon (doc)en
dc.subjectFishen
dc.subjectMethylationen
dc.subjectRiver Pollutionen
dc.subjectDissolved Organic Matteren
dc.subjectMercuryen
dc.subjectOrganic Carbonen
dc.subjectAquatic Ecosystemen
dc.subjectBioaccumulationen
dc.subjectFishen
dc.subjectMercury (element)en
dc.subjectPredatoren
dc.subjectAnimals Experimenten
dc.subjectCarnivoryen
dc.subjectChemical Analysisen
dc.subjectControlled Studyen
dc.subjectEnvironmental Factoren
dc.subjectFishen
dc.subjectFloodingen
dc.subjectFloodplainen
dc.subjectForesten
dc.subjectGeographyen
dc.subjectMethylationen
dc.subjectNonhumanen
dc.subjectPhen
dc.subjectPriority Journalen
dc.subjectRiver Basinen
dc.subjectSoilen
dc.subjectTelecommunicationen
dc.subjectWater Samplingen
dc.subjectAnimalen
dc.subjectEnvironmental Monitoringen
dc.subjectFishesen
dc.subjectFood Chainen
dc.subjectHydrogen-ion Concentrationen
dc.subjectMercuryen
dc.subjectMuscle, Skeletalen
dc.subjectRiversen
dc.subjectSoil Pollutantsen
dc.subjectWater Pollutants, Chemicalen
dc.subjectAmazonasen
dc.subjectRio Negro [south America]en
dc.subjectSouth Americaen
dc.subjectCichlaen
dc.subjectHoplias Malabaricusen
dc.subjectPiscesen
dc.titleFactors controlling Hg levels in two predatory fish species in the Negro river basin, Brazilian Amazonen
dc.typeArtigopt_BR
dc.identifier.doi10.1016/j.scitotenv.2006.03.033-
dc.publisher.journalScience of the Total Environmentpt_BR
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