Mortality and Abnormalities Observed After Experimental Hg Exposure in the Polychaete Eurythoe complanata (Pallas) from Mazatlan, Mexico
Lethal effects of Hg on Eurythoe complanata held under laboratory conditions were evaluated (LC50 and LT50). Worms were exposed to 0-900 microg/L of Hg for 10 days. Mortality occurred in all the treatments, being faster at 200-900 microg/L, which was confirmed by a Friedman ANOVA non-parametric test. The 4-day LC50 = 197.15 microg/L (200 microg/L LT50 = 3.4 days) was similar to that reported for other Hg tolerant annelids. Abnormalities were observed in worms exposed to all the treatments, becoming more severe as Hg concentrations increased: body darkening, rough, white and opaque skin, everted and swollen proboscis and gut evisceration.
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