title: Fatty acid alterations in the detritivorous Prochilodus lineatus promoted by opportunistic feeding on sewage discharges in the Río de la Plata estuary.
abstract: Muscle fatty acid profiles and PCB contents of the detritivorous species Prochilodus lineatus and its diet (stomach contents, settling particles and sediments) were analysed from reference and polluted areas of the Paraná-Rio de la Plata basin, to evaluate the alterations produced by opportunistic feeding on sewage discharges. Overall muscle fatty acid composition was dominated by saturated and monounsaturated 16 and 18 carbon (18 C-FA) components with reduced long-chain polyunsaturated fatty acids (LC-PUFA). Compared to sediments, settling particles and stomach contents were enriched in lipids and had a similar fatty acid composition. Opportunistic feeding on sewage detritus at Buenos Aires resulted in enhanced PCB and triglyceride accumulation, with higher proportions of 18 C-FA and lower proportions of 16:1 and LC-PUFA compared to fish from northern pristine reaches of the basin. Mid-Paraná showed intermediate values reflecting mixing of the North stock with migrating Buenos Aires P. lineatus identified by their lipid and contaminant profile. According to multivariate analyses, this geographical variation of fatty acid composition was strongly influenced by PCB concentration. Prochilodus lineatus assimilates the energy subsidy of sewage inputs through enhanced lipogenesis with dominant 18 C-FA and significant amounts of valuable LC-PUFA. This lipid alteration facilitates the bioaccumulation of PCBs which in turn may reinforce the adipogenic effect of sewage feeding.
authors: Laboratorio de Química Ambiental y Biogeoquímica, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Av. Calchaquí 6200, Florencio Varela, Buenos Aires, 1888, Argentina. esperanza@fcnym.unlp.edu.ar.|Consejo Nacional de Investigaciones Científicas y Técnicas, Godoy Cruz 2290, C1425FQB C.A.B.A., Buenos Aires, Argentina. esperanza@fcnym.unlp.edu.ar.
authors: E D
authors: ED
authors: Speranza
authors: Laboratorio de Química Ambiental y Biogeoquímica, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Av. Calchaquí 6200, Florencio Varela, Buenos Aires, 1888, Argentina.
authors: M
authors: M
authors: Colombo
authors: Laboratorio de Química Ambiental y Biogeoquímica, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Av. Calchaquí 6200, Florencio Varela, Buenos Aires, 1888, Argentina.|Consejo Nacional de Investigaciones Científicas y Técnicas, Godoy Cruz 2290, C1425FQB C.A.B.A., Buenos Aires, Argentina.
authors: L M
authors: LM
authors: Tatone
authors: Laboratorio de Química Ambiental y Biogeoquímica, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Av. Calchaquí 6200, Florencio Varela, Buenos Aires, 1888, Argentina.|Consejo Nacional de Investigaciones Científicas y Técnicas, Godoy Cruz 2290, C1425FQB C.A.B.A., Buenos Aires, Argentina.
authors: N
authors: N
authors: Cappelletti
authors: Laboratorio de Química Ambiental y Biogeoquímica, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Av. Calchaquí 6200, Florencio Varela, Buenos Aires, 1888, Argentina.|Consejo Nacional de Investigaciones Científicas y Técnicas, Godoy Cruz 2290, C1425FQB C.A.B.A., Buenos Aires, Argentina.
authors: M C
authors: MC
authors: Migoya
authors: Laboratorio de Química Ambiental y Biogeoquímica, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Av. Calchaquí 6200, Florencio Varela, Buenos Aires, 1888, Argentina.|Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, calle 10 y 526, La Plata, Buenos Aires, 1900, Argentina.
authors: J C
authors: JC
authors: Colombo
mesh_terms: D000818:Animals; D060125:Characiformes / Q000378:metabolism / Q000502:physiology*; D063366:Estuaries; D005227:Fatty Acids / Q000032:analysis / Q000737:chemistry*; D005247:Feeding Behavior / Q000502:physiology*; D005766:Gastrointestinal Contents / Q000737:chemistry; D009132:Muscles / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000378:metabolism; D012722:Sewage / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D012722:Sewage; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls
keywords: PCB; Paraná basin; detritivory; fatty acid composition; lipids; pollution