Population level indicators of stress: Effects of two heavy metals (copper and mercury) on the growth of Lecane quadridentata (Ehrenberg, 1830) (Rotifera: Lecanidae)
Por:
Sarma, SSS, Corral-Jacquez, FI, Nandini, S, Brena-Bustamante, P
Publicada:
1 ene 2010
Categoría:
Environmental Engineering
Resumen:
We quantified the population level responses of Lecane quadridentata exposed separately to five different concentrations of Cu (0.3125, 0.625, 1.25, 2.5 and 5.0 mu g/L as CuSO(4)) and Hg (0.0844, 0.1688, 0.3375, 0.675 and 1.35 mu g/L as HgCl(2)) at 23 degrees C and under an algal food density of 1 x 10(6) cells/mL of Chlorella vulgaris for 24 days. We derived peak population densities and the rate of population increase (r) per day in both controls and in heavy metal treatments. In general, the population growth of L. quadridentata decreased with increasing concentration of Cu or Hg in the medium. The growth was similar in controls and in the lowest tested concentration of Cu (0.3125 mu g/L), whereas in Hg treatments, even at the lowest tested concentration (0.0844 mu g/L), there was a drastic decline of rotifer densities. The peak population densities in controls were 63 +/- 5 ind./mL, whereas in heavy metal treatments, they ranged from 1 to 58 ind./mL depending on the concentration.
Filiaciones:
Sarma, SSS:
Univ Nacl Autonoma Mexico, Div Res & Postgrad Studies, Lab Aquat Zool, Los Reyes 54000, Tlalnepantla, Mexico
Corral-Jacquez, FI:
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, 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
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