title: Health status and bioremediation capacity of wild freshwater mussels (Diplodon chilensis) exposed to sewage water pollution in a glacial Patagonian lake.
abstract: Deleterious effects on health and fitness are expected in mussels chronically exposed to sewage water pollution. Diplodon chilensis inhabiting SMA, an area affected by untreated and treated sewage water, shows increased hemocyte number and phagocytic activity, while bacteriolytic and phenoloxidase activities in plasma and reactive oxygen species production in hemocytes are lower compared to mussels from an unpolluted area (Yuco). There are not differences in cell viability, lysosomal membrane stability, lipid peroxidation and total oxygen scavenging capacity between SMA and Yuco mussels' hemocytes. Energetic reserves and digestive gland mass do not show differences between groups; although the condition factor is higher in SMA than in Yuco mussels. Gills of SMA mussels show an increase in mass and micronuclei frequency compared to those of Yuco. Mussels from both sites reduce bacterial loads in polluted water and sediments, improving their quality with similar feeding performance. These findings suggest that mussels exposed to sewage pollution modulate physiological responses by long-term exposure; although, gills are sensitive to these conditions and suffer chronic damage. Bioremediation potential found in D. chilensis widens the field of work for remediation of sewage bacterial pollution in water and sediments by filtering bivalves.
authors.affiliation: Laboratorio de Ecotoxicología Acuática, INIBIOMA (CONICET-UNCo) - CEAN, ruta provincial 61, km 3, 8371 Junín de los Andes, Neuquén, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia, 1917 Buenos Aires, Argentina. Electronic address: vabianchi@comahue-conicet.gob.ar.
authors.forename: Virginia A
authors.initials: VA
authors.lastname: Bianchi
authors.affiliation: Laboratorio de Ecotoxicología Acuática, INIBIOMA (CONICET-UNCo) - CEAN, ruta provincial 61, km 3, 8371 Junín de los Andes, Neuquén, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia, 1917 Buenos Aires, Argentina.
authors.forename: Juan M
authors.initials: JM
authors.lastname: Castro
authors.affiliation: Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia, 1917 Buenos Aires, Argentina; Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pab. II, Ciudad Universitaria, 1428 Buenos Aires, Argentina; Department of Functional Ecology, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany.
authors.forename: Iara
authors.initials: I
authors.lastname: Rocchetta
authors.affiliation: Laboratorio de Ecotoxicología Acuática, INIBIOMA (CONICET-UNCo) - CEAN, ruta provincial 61, km 3, 8371 Junín de los Andes, Neuquén, Argentina.
authors.forename: Flavia
authors.initials: F
authors.lastname: Bieczynski
authors.affiliation: Laboratorio de Ecotoxicología Acuática, INIBIOMA (CONICET-UNCo) - CEAN, ruta provincial 61, km 3, 8371 Junín de los Andes, Neuquén, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia, 1917 Buenos Aires, Argentina.
authors.forename: Carlos M
authors.initials: CM
authors.lastname: Luquet
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D001118:Argentina; D001673:Biodegradation, Environmental; D049872:Bivalvia / Q000187:drug effects / Q000276:immunology / Q000502:physiology*; D005880:Gills / Q000187:drug effects / Q000378:metabolism; D006434:Hemocytes / Q000187:drug effects / Q000378:metabolism; D007111:Immunity, Cellular; D056724:Immunity, Humoral; D060106:Lakes / Q000737:chemistry / Q000382:microbiology; D018384:Oxidative Stress; D012722:Sewage / Q000032:analysis / Q000382:microbiology; D014873:Water Pollutants / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity
chemical_list: D000975:Antioxidants; D012722:Sewage; D014873:Water Pollutants
keywords: Bacterial pollution; Clearance rate; Filtration rate; Immune response; Oxidative balance