Body size and population growth of Brachionus patulus (Rotifera) in relation to heavy metal (copper and mercury) concentrations
Por:
Sarma, SSS, Brena-Bustamante, P, Nandini, S
Publicada:
1 ene 2008
Categoría:
Environmental Engineering
Resumen:
The effect of different sublethal concentrations of Cu+2 and Hg+2 was evaluated on the population growth and morphometry (body width and postero-lateral spines) of Brachionus patulus. When exposed to Cu+2 at lower concentrations (i.e., 2.5% and 5.0% of LC50), the population growth of B. patulus did not differ significantly from controls, while at the corresponding conditions, Hg+2 had adverse effects. The rate of population increase (r) varied from 0.13 to 0.28 per day, depending on the metal type and its concentration in the medium. In general, increase in metal concentration decreased the rate of population increase. When the daily growth rate was plotted as function of population density over the entire growth phase, a significantly inverse relation was obtained for controls and in treatments containing lower concentrations (2.5 and 5% of LC50) of heavy metals. However, under higher metal concentrations, the relation between population density and the daily growth rate became non-si
Filiaciones:
Sarma, SSS:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Los Reyes 54000, Tlalnepantla, Mexico
Brena-Bustamante, P:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Los Reyes 54000, Tlalnepantla, Mexico
Nandini, S:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, UIICSE, Los Reyes, Tlalnepantla, Mexico
|