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 g 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 g Zn/ml, and a sharp decrease in fecundity from the twentieth day of life at all levels of metal enrichment tested. Treated groups were characterized 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 () 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.

Effects of zinc on the polychaete Dinophilus gyrociliatus: a life table response experiment / Mauri, Marina; Baraldi, Elena; Simonini, Roberto. - In: AQUATIC TOXICOLOGY. - ISSN 0166-445X. - ELETTRONICO. - 65:(2003), pp. 93-100.

Effects of zinc on the polychaete Dinophilus gyrociliatus: a life table response experiment

MAURI, Marina;BARALDI, Elena;SIMONINI, Roberto
2003

Abstract

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 g 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 g Zn/ml, and a sharp decrease in fecundity from the twentieth day of life at all levels of metal enrichment tested. Treated groups were characterized 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 () 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.
65
93
100
Effects of zinc on the polychaete Dinophilus gyrociliatus: a life table response experiment / Mauri, Marina; Baraldi, Elena; Simonini, Roberto. - In: AQUATIC TOXICOLOGY. - ISSN 0166-445X. - ELETTRONICO. - 65:(2003), pp. 93-100.
Mauri, Marina; Baraldi, Elena; Simonini, Roberto
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/308012
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