| a comparison of the response of simocephalus mixtus (cladocera) and daphnia magna to contaminated freshwater sediments. | the southeast region of mexico is characterized by intensive oil industry activities carried out by the national public enterprise petróleos mexicanos (pemex). the freshwater lagoon "el limón", located in the municipality of macuspana, state of tabasco, mexico, has received over 40 years discharges of untreated waste waters from the petrochemical complex "ciudad pemex", located on the border of the lagoon. to assess the toxicity of the sediments and, hence, to obtain information on the biologica ... | 2008 | 18573528 |