title: Organochlorine compounds in Purple Heron eggs (Ardea purpurea) nesting in sites located around a chlor-alkali plant (Ebro River).
abstract: Eggs of Purple Heron (Ardea purpurea) were collected from three sampled sites inside the Ebro River basin in years 2006 and 2007. These sites were located besides (Flix), upstream (Aiguabarreig) and downstream (Delta) a chlor-alkali plant. Organochlorine compounds (OCs) such as dichlorodiphenyltrichloroethanes (DDTs), polychlorobiphenyls (PCBs), polychlorostyrenes (PCSs), hexachlorobenzene (HCB), pentachlorobenzene (PeCB) and hexachlorocyclohexanes (HCHs) were analysed to assess what are the accumulation patterns of these compounds in aquatic migratory birds breeding in the area of influence of the emissions from this industrial installation. Comparison of the egg concentrations between the three sites show higher concentrations of compounds manufactured in the past in the factory (PCBs, p,p'-DDT) or by-products of OC synthesis (HCB, PeCB and PCSs) in Flix than in Aiguabarreig reflecting a clear influence from the emissions of the chlor-alkali plant. The eggs collected in the Ebro Delta showed higher concentrations of total DDTs (mainly p,p'-DDE) than in the reference site (Aiguabarreig) which could reflect past applications of this insecticide in the area for agriculture. In contrast, HCHs were found in higher concentrations in the Delta and Aiguabarreig than in the Flix Reservoir. These compounds have been used as insecticides in agriculture and were not manufactured in the chlor-alkali plant. The present results show that despite Purple Herons are migratory birds, the food web transfer of OCs during the breeding season is sufficient for the accumulation of these compounds in the eggs, leading to statistically significant concentration differences between sites. These differences are consistent with the emissions of these pollutants from industrial or agricultural sources to the aquatic environments. Some of the p,p'-DDE concentrations observed in the area nearby the chlor-alkali plant are above the threshold effects for reproductive impairment.
authors.affiliation: Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona 18, 08034 Barcelona, Catalonia, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Huertas
authors.affiliation: Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona 18, 08034 Barcelona, Catalonia, Spain. Electronic address: joan.grimalt@idaea.csic.es.
authors.forename: Joan O
authors.initials: JO
authors.lastname: Grimalt
authors.affiliation: Department of Public Health, Faculty of Medicine, University of Barcelona, Casanova 143, 08036 Barcelona, Catalonia, Spain.
authors.forename: Lluís
authors.initials: L
authors.lastname: Jover
authors.affiliation: Department of Animal Biology, Faculty of Biology, University of Barcelona, Av. Diagonal 645, 08028 Barcelona, Catalonia, Spain.
authors.forename: Carola
authors.initials: C
authors.lastname: Sanpera
authors.affiliation: Department of Animal Biology, Faculty of Biology, University of Barcelona, Av. Diagonal 645, 08028 Barcelona, Catalonia, Spain.
authors.forename: Xavier
authors.initials: X
authors.lastname: Ruiz
mesh_terms: D000818:Animals; D001717:Birds; D003634:DDT; D003633:Dichlorodiphenyl Dichloroethylene; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis*; D020387:Food Chain; D006581:Hexachlorobenzene; D001556:Hexachlorocyclohexane; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D007306:Insecticides; D010063:Ovum / Q000737:chemistry*; D011078:Polychlorinated Biphenyls; D045483:Rivers
chemical_list: D004785:Environmental Pollutants; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D003633:Dichlorodiphenyl Dichloroethylene; D006581:Hexachlorobenzene; D001556:Hexachlorocyclohexane; D003634:DDT; D011078:Polychlorinated Biphenyls
keywords: Aquatic birds; Ardea purpurea; DDT; Hexachlorobenzene; Organochlorine compounds; Polychlorobiphenyls; Polychlorostyrenes; Purple Heron