title: Distribution of total and methylmercury in different ecosystem compartments in the Everglades: implications for mercury bioaccumulation.
abstract: We analyzed Hg species distribution patterns among ecosystem compartments in the Everglades at the landscape level in order to explore the implications of Hg distribution for Hg bioaccumulation and to investigate major biogeochemical processes that are pertinent to the observed Hg distribution patterns. At an Everglade-wide scale, THg concentrations were significantly increased in the following order: periphyton<flocculent material (floc)<soil, while relatively high MeHg concentrations were observed in floc and periphyton. Differences in the methylation potential, THg concentration, and MeHg retention capacity could explain the relatively high MeHg concentrations in floc and periphyton. The MeHg/THg ratio was higher for water than for soil, floc, or periphyton probably due to high dissolved organic carbon (DOC) concentrations present in the Everglades. Mosquitofish THg positively correlated with periphyton MeHg and DOC-normalized water MeHg. The relative THg and MeHg distribution patterns among ecosystem compartments favor Hg bioaccumulation in the Everglades.
authors.affiliation: Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
authors.forename: Guangliang
authors.initials: G
authors.lastname: Liu
authors.forename: Yong
authors.initials: Y
authors.lastname: Cai
authors.forename: Thomas
authors.initials: T
authors.lastname: Philippi
authors.forename: Peter
authors.initials: P
authors.lastname: Kalla
authors.forename: Daniel
authors.initials: D
authors.lastname: Scheidt
authors.forename: Jennifer
authors.initials: J
authors.lastname: Richards
authors.forename: Leonard
authors.initials: L
authors.lastname: Scinto
authors.forename: Charlie
authors.initials: C
authors.lastname: Appleby
mesh_terms: D000818:Animals; D002244:Carbon / Q000032:analysis; D003532:Cyprinodontiformes / Q000378:metabolism; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D005431:Florida; D020387:Food Chain; D005618:Fresh Water; D005659:Fungicides, Industrial / Q000032:analysis*; D008628:Mercury / Q000032:analysis*; D008629:Mercury Isotopes; D008767:Methylmercury Compounds / Q000032:analysis*; D010933:Plankton; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D004785:Environmental Pollutants; D005659:Fungicides, Industrial; D008629:Mercury Isotopes; D008767:Methylmercury Compounds; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D002244:Carbon; D008628:Mercury