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Effects of zinc exposure on the polychaete Dinophilus gyrociliatus: a life-table response experiment
Mauri, M.; Baraldi, E.; Simonini, R. (2003). Effects of zinc exposure on the polychaete Dinophilus gyrociliatus: a life-table response experiment. Aquat. Toxicol. 65(1): 93-100
In: Aquatic Toxicology. Elsevier Science: Tokyo; New York; London; Amsterdam. ISSN 0166-445X, more
Peer reviewed article  

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    Ecotoxicology; Environmental effects; Fecundity; Heavy metals; Life cycle; Population dynamics; Reproduction; Zinc; Dinophilus gyrociliatus O. Schmidt, 1857 [WoRMS]; Polychaeta [WoRMS]; MED, Italy, Liguria, Genoa Gulf [Marine Regions]; Marine

Authors  Top 
  • Mauri, M., correspondent
  • Baraldi, E.
  • Simonini, R.

    A life-table response experiment (LTRE) was performed in order to study the effects of enhanced zinc on the survival, fecundity and demographic indices of Dinophilus gyrociliatus (Polychaeta). A control group and three treated cohorts kept in artificial seawater enriched with nominal concentrations of zinc at 0.25, 0.50 and 1.00 μg Zn/ml, respectively, were considered. Zinc marginally affected survival but had a strong impact on the reproduction of D. gyrociliatus. Zinc enrichment had no effect on age at maturity, whereas it induced a slight increase in fecundity during the early reproductive phases at 0.50 and 1.00 μg Zn/ml, and a sharp decrease in fecundity from the 20th day of life at all levels of metal enrichment tested. Treated groups were characterised by a marked reduction of the net growth rate (R0) and a decrease in generation time (T) with respect to the control groups, but no effect on life expectancy (e0) or on population growth rates (λ) was observed. R0 and , which are the most commonly used indices of fitness, were not equally susceptible to zinc. appears less sensitive to stress induced by metal enrichment with respect to R0 and other life history traits like age-specific fecundity. D. gyrociliatus appears to be an appropriate bioindicator species in LTRE to assess the consequences of environmental heavy metals on individual life-history and population dynamics.

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