title: DDT in zebra mussels from Lake Maggiore (N. Italy): level of contamination and endocrine disruptions.
abstract: The DDT contamination of Lake Maggiore (Northern Italy) has been monitored since a serious pollution event occurred in 1996. To assess the environmental risk associated with this contamination, bioaccumulation data coupled with histopathological markers were evaluated on zebra mussel populations from two different contaminated sites from April 2001 to April 2002. Biomonitoring results showed high DDT pollution in 2001 because of a flood which transported DDTs still contained in the sediments of a polluted river to the lake. DDT concentrations reached values of 4-5 microg/g lipids, higher than those recorded in other industrialized countries but comparable to levels measured in developing ones. In the ovaries of the most highly polluted mussels, histological analyses showed a delay in oocyte maturation and a high incidence of pathological pictures mainly referable to oocyte degeneration and haemocytic infiltration. Moreover, despite the presence of mature sperms, in 2001 first male gamete release occurred about 2 months later than in females. These results indicated a neuroendocrine interference of DDT on Dreissena polymorpha reproduction and also showed that these invertebrates can be successfully used to evaluate ecological implications due to exposure to endocrine disruptors in freshwater environments.
authors.affiliation: Dipartimento di Biologia, Università degli Studi di Milano, Sezione di Ecologia, 26 Via Celoria, I-20133 Milan, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Binelli
authors.forename: Renato
authors.initials: R
authors.lastname: Bacchetta
authors.forename: Paride
authors.initials: P
authors.lastname: Mantecca
authors.forename: Francesco
authors.initials: F
authors.lastname: Ricciardi
authors.forename: Alfredo
authors.initials: A
authors.lastname: Provini
authors.forename: Giovanni
authors.initials: G
authors.lastname: Vailati
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000187:drug effects / Q000378:metabolism*; D002849:Chromatography, Gas; D003634:DDT / Q000493:pharmacokinetics* / Q000633:toxicity; D004784:Environmental Monitoring / Q000706:statistics & numerical data*; D005260:Female; D005618:Fresh Water; D006652:Histological Techniques; D007558:Italy; D008297:Male; D009865:Oocytes / Q000187:drug effects; D010053:Ovary / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D012098:Reproduction / Q000187:drug effects; D012744:Sex Ratio; D013094:Spermatozoa / Q000187:drug effects / Q000502:physiology; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000493:pharmacokinetics* / Q000633:toxicity
chemical_list: D014874:Water Pollutants, Chemical; D003634:DDT