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Mortality and Abnormalities Observed After Experimental Hg Exposure in the Polychaete Eurythoe complanata (Pallas) from Mazatlan, Mexico

Nuria Méndez, Carlos Green-Ruíz, and Ramón Vázquez-Núñez

Bull Environ Contam Toxicol 83(4):488-492 (2009) PMID 19652897

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.

DOI: 10.1007/s00128-009-9820-7
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