Turkish Journal of Fisheries and Aquatic Sciences
2019, Vol 19, Num, 7 (Pages: 615-623)
Acute Sensitivity Comparison among Daphnia magna Straus, 1820 Daphnia pulex Leydig, 1860 and Simocephalus vetulus Müller, 1776, Exposed to Nine Toxicants
Gustavo Emilio Santos-Medrano 1 ,Roberto Rico-Martínez 1
1 Universidad Autónoma de Aguascalientes, Centro de Ciencias Básicas, Departamento de Química. Avenida Universidad 940, Aguascalientes, Ags. México, C.P. 20100
DOI :
10.4194/1303-2712-v19_7_08
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A comparison of acute toxicity (LC50 values) among nine toxicants: a) six metals: Cd,
Cr, Cu, Hg, Pb, Ti, and b) three organics: benzene, ethyl acetate, and toluene,
between the exotic cladoceran species Daphnia magna Straus 1820 and two native
strains of freshwater cladoceran species: Daphnia pulex Leydig, 1860 and
Simocephalus vetulus (O. F. Müller, 1776) was performed. We hypothesized that the
exotic species would be less sensitive than native species. Our hypothesis was
fulfilled. Daphnia magna was less sensitive than native species to eight of the nine
compounds we analyzed. Results suggest that native species are better adjusted to
local environmental conditions, and are more reliable as bioindicators of potential
effects of toxicants on aquatic biota. Although the use of D. magna is recommended
because of its ample toxicity database, some researchers propose the use of native
species for toxicity tests. Therefore, to propose a native species to be considered as a
test organism for official toxicity test for tropical countries, there is a need to
increase the database of toxicants and to compare the sensitivities of several classes
of toxicants with a model organism whose sensitivity to a broad variety of toxicants is
well known, like D. magna.
Keywords :
Aquatic Toxicology, Cladocera, Environmental Legislation, Environmental Toxicology, Metal Toxicity