| Abstract | Concentrations of DDTs and PCBs were determined in the zooplankton and in three different fish species (shad, whitefish and roach) collected seasonally during 2009 and 2010 in three sites in Lake Maggiore, a south-alpine lake that has been contaminated by DDT since 1996. As previously observed in 2008, even during 2009 DDTs concentrations were higher in zooplankton than in fish, probably due to the very unstable situation of the lake still influenced by local inputs. The situation changed in 2010, when all DDT compounds increased in fish to levels much higher than those measured in zooplankton. Biomagnification was statistically demonstrated for pp0DDE in all the three fish species, indicating a probable signal of recovery of the lake. Although with respect to total PCBs we observed that the contamination levels varied across time periods and across fish species, biomagnification was evident from zooplankton to fish both in 2009 and in 2010. As concern individual PCBs, biomagnification from zooplankton to all three fish species was significant for PCB 153 and PCB 138. |
| Text | 192696 2012 Seasonal fluctuations of DDTs and PCBs in zooplankton and fish of Lake Maggiore Northern Italy Bettinetti R., Quadroni S., Manca M., Piscia R., Volta P., Guzzella L., Roscioli C., Galassi S. Department of Environment, Health, Safety, University of Insubria, Via J.H. Dunant 3, I 1100 Varese, Italy ;CNR ISE, Pallanza Verbania ;CNR IRSA Brugherio, Milano ;Department of Biology, University of Milan, Via Celoria 26, 20133 Milan, Italy Concentrations of DDTs and PCBs were determined in the zooplankton and in three different fish species shad, whitefish and roach collected seasonally during 2009 and 2010 in three sites in Lake Maggiore, a south alpine lake that has been contaminated by DDT since 1996. As previously observed in 2008, even during 2009 DDTs concentrations were higher in zooplankton than in fish, probably due to the very unstable situation of the lake still influenced by local inputs. The situation changed in 2010, when all DDT compounds increased in fish to levels much higher than those measured in zooplankton. Biomagnification was statistically demonstrated for pp0DDE in all the three fish species, indicating a probable signal of recovery of the lake. Although with respect to total PCBs we observed that the contamination levels varied across time periods and across fish species, biomagnification was evident from zooplankton to fish both in 2009 and in 2010. As concern individual PCBs, biomagnification from zooplankton to all three fish species was significant for PCB 153 and PCB 138. 88 Articolo in rivista Elsevier 0045 6535 Chemosphere Chemosphere Chemosphere Chemosphere. Chemosphere. Environmental chemistry, Chemosphere. Persistent organic pollutants and dioxins, Chemosphere. Environmental toxicology and risk assessment, Chemosphere. Science for Environmental toxicology, liciamaria.guzzella GUZZELLA LICIA MARIA roberta.piscia PISCIA ROBERTA claudiogiovanni.roscioli ROSCIOLI CLAUDIO GIOVANNI pietro.volta VOLTA PIETRO marinamarcella.manca MANCA MARINA MARCELLA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici TA.P02.031.001 Impatto dei cambiamenti climatici sulla gestione delle risorse idriche |
