title: Biomarker responses to pollution in two invertebrate species: Scrobicularia plana and Nereis diversicolor from the Cádiz bay (SW Spain).
abstract: The clam Scrobicularia plana and the polychaete worm Nereis diversicolor were collected in several sites from a littoral enclosure in SW Spain. The aim of our study was to relate various biomarker responses in these species to a pollution gradient caused by untreated domestic discharges and to verify the adequacy of the selected species as sentinels in this habitat. The biomarkers selected were the antioxidant enzymes catalase (CAT), glutathione peroxidase (GPX) and DT-diaphorase (DT-D). In addition, the activities of cytochrome P450-dependent ethoxyresorufin O-deethylase (EROD) activity, the phase II detoxifying enzyme glutathione S-transferase (GST) and the neurotoxicity marker acetylcholinesterase (AChE) were measured. Metallothionein levels were selected as biomarkers of heavy metals exposure in both species. The results suggest a different response in the water filtering organism (clam) and the sediment eater (polychaete), probably as a consequent of different pollution exposure and that samples from the "Caño Sancti-Petri" were exposed to biologically active compounds that altered some of their biochemical responses. AChE was the most sensitive biomarker in both species and N. diversicolor proved to be a more robust sentinel in this ecosystem.
authors.affiliation: Instituto de Ciencias Marinas de Andalucía (CSIC), Av. República Saharaui, 2, 11510 Puerto Real, Cádiz, Spain.
authors.forename: Erkuden
authors.initials: E
authors.lastname: Pérez
authors.forename: Julian
authors.initials: J
authors.lastname: Blasco
authors.forename: Montserrat
authors.initials: M
authors.lastname: Solé
mesh_terms: D000110:Acetylcholinesterase / Q000378:metabolism; D000818:Animals; D015415:Biomarkers / Q000737:chemistry; D049872:Bivalvia / Q000201:enzymology*; D002374:Catalase / Q000378:metabolism; D019363:Cytochrome P-450 CYP1A1 / Q000378:metabolism; D004781:Environmental Exposure; D004784:Environmental Monitoring; D005843:Geography; D005979:Glutathione Peroxidase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D008668:Metallothionein / Q000378:metabolism; D016660:NAD(P)H Dehydrogenase (Quinone) / Q000378:metabolism; D011077:Polychaeta / Q000201:enzymology*; D012623:Seawater; D013030:Spain
chemical_list: D015415:Biomarkers; D008668:Metallothionein; D002374:Catalase; D005979:Glutathione Peroxidase; D019363:Cytochrome P-450 CYP1A1; D016660:NAD(P)H Dehydrogenase (Quinone); D005982:Glutathione Transferase; D000110:Acetylcholinesterase