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DatoValore
TitleImpact of heavy metals and PCBs on marine picoplankton.
AbstractSynergistic/antagonistic effects of multiple contaminants in marine environments are almost completely unexplored. In the present study we investigated the effects of heavy metals (Zn and Pb) and PCBs on picoplankton abundance, biomass, cell size distribution and bacterial C production. Natural picoplankton assemblages were exposed to heavy metals (Zn or Pb), organic contaminants (PCBs, Aroclor 1260) and to a mixture of different contaminants. The results of the present study indicate that Zn addition stimulated heterotrophic growth, whereas Pb has a negative impact on heterotrophic picoplankton, particularly significant in the first 24 hours. Heavy metals had not effects on the autotrophic component. The addition of Aroclor 1260 had a significant impact on abundance, biomass and cell size of autotrophic and heterotrophic picoplankton and reduced significantly bacterial secondary production. Three weeks after PCBs treatment, heterotrophic bacteria displayed a clear resilience both in terms of abundance and biomass, reaching values comparable to those of the controls, but not in terms of bacterial C production. Our results indicate that picoplankton can be sensitive indicators of impact determined by heavy metals and PCBs in coastal marine systems.
SourceEnvironmental toxicology (Print) 21, pp. 541–551
KeywordsPicoplanktonHeavy metalsPCBsbacterial C production
JournalEnvironmental toxicology (Print)
EditorJohn Wiley & Sons,, New York, N.Y., Stati Uniti d'America
Year2006
TypeArticolo in rivista
DOI10.1002/tox.20215
AuthorsCAROPPO C., STABILI L., ARESTA M., CORINALDESI C., DANOVARO R.
Text6361 2006 10.1002/tox.20215 ISI Web of Science WOS 000242103400001 Picoplankton Heavy metals PCBs bacterial C production Impact of heavy metals and PCBs on marine picoplankton. CAROPPO C., STABILI L., ARESTA M., CORINALDESI C., DANOVARO R. 1 Istituto Ambiente Marino Costiero CNR, Sede Talassografico A. Cerruti Via Roma, 3 74100 Taranto Italy 2 Dipartimento di Chimica, Universita di Bari Campus Universitario Via E. Orabona 4 –70126 Bari Italy 3 Dipartimento Scienze del Mare, Universita Politecnica delle Marche Via Brecce Bianche – 60131 Ancona Italy Synergistic/antagonistic effects of multiple contaminants in marine environments are almost completely unexplored. In the present study we investigated the effects of heavy metals Zn and Pb and PCBs on picoplankton abundance, biomass, cell size distribution and bacterial C production. Natural picoplankton assemblages were exposed to heavy metals Zn or Pb , organic contaminants PCBs, Aroclor 1260 and to a mixture of different contaminants. The results of the present study indicate that Zn addition stimulated heterotrophic growth, whereas Pb has a negative impact on heterotrophic picoplankton, particularly significant in the first 24 hours. Heavy metals had not effects on the autotrophic component. The addition of Aroclor 1260 had a significant impact on abundance, biomass and cell size of autotrophic and heterotrophic picoplankton and reduced significantly bacterial secondary production. Three weeks after PCBs treatment, heterotrophic bacteria displayed a clear resilience both in terms of abundance and biomass, reaching values comparable to those of the controls, but not in terms of bacterial C production. Our results indicate that picoplankton can be sensitive indicators of impact determined by heavy metals and PCBs in coastal marine systems. 21 Caroppo_et_al_ET_2006 Caroppo_et_al_ET_2006.pdf Articolo in rivista John Wiley Sons, 1520 4081 Environmental toxicology Print Environmental toxicology Print Environ. toxicol. Print Environmental toxicology. Print carmela.caroppo CAROPPO CARMELA loredana.stabili STABILI LOREDANA TA.P04.002.001 Fascia Costiera e Ambienti di Transizione analisi strutturale e funzionale delle componenti biotiche ed abiotiche degli ecosistemi per lo sviluppo sostenibile delle attivita TA.P02.016.002 Particellato sospeso e microorganismi nei processi biogeochimici