{"refrec":{"BRefID":144228,"RR":"<b>Ciarelli, S.; Kater, B.J.; van Straalen, N.M.</b> (2000). Influence of bioturbation by the amphipod <i>Corophium volutator</i> on fluoranthene uptake in the marine polychaete <i>Nereis virens</i>. <i>Environ. Toxicol. Chem. 19(6)</i>: 1575-1581","BEntID":137370,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Environ. Toxicol. Chem. 19(6)</i>: 1575-1581","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Ciarelli, S.; Kater, B.J.; van Straalen, N.M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Ciarelli, S.; Kater, B.J.; van Straalen, N.M.","Englishabstract":"The uptake kinetics of fluoranthene in the polychaete worm <i>Nereis virens</o> were investigated in the presence and in the absence of amphipods to examine the effects of sediment hioturhation by the benthic amphipod <i>Corophium volutator</i> on the uptake in worms. Worms only and worms together with two different densities of amphipods were exposed to fluoranthene-spiked sediment for 12 d. Worms and overlying water samples for fluoranthene analyses were taken and total suspended solids in water column were measured after 1, 2, 5, 8, and 12 d. Results showed that in all treatments fluoranthene was rapidly accumulated by <i>N. virens</i> during the first two days and a steady state was reached within five days of exposure. Biota to sediment accumulation factors normalized to lipid concentration and to sediment organic carbon (BAF<sub>loc</sub>) of worms exposed with the highest number of amphipods were significantly higher (two to three times) compared to worms exposed with fewer or without amphipods after one and two days of exposure. Bioconcentration factors (BCFs), calculated as the ratio between the uptake (k<sub>1</sub> and elimination (k<sub>2</sub>) rate constants were not significantly different among treatments. When BCFs were calculated on the basis of dissolved fluoranthene concentrations (BCF<sub>diss</sub>), values of the treatments where worms were exposed with 100 and 300 amphipods were slightly higher than those calculated on the basis of total (dissolved + particle-bound) aqueous fluoranthene (BCF<sub>tot</sub>). However, the presence of fluoranthene bound to dissolved organic matter could have accounted for lower than expected BCF<sub>diss</sub>values. The results suggest that bioturbation by amphipods affected the concentration of fluoranthene in the worms not by changing the worm to water partitioning (k<sub>1</sub>/k<sub>2</sub>) but by changing the worm to sediment partitioning (BAF<sub>loc</sub>). In the treatments with worms a higher mortality of amphipods was found compared to those without worms. 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