Abstract

IANNACONE OLIVER, José Alberto  and  ALVARINO FLORES, Lorena. Efecto Ecotoxicológico agudo del Mercurio sobre Larvas del "Muy Muy" emerita analoga (Stimpson) (Decapoda: Hippidae) procedentes de cuatro localidades de Lima. Ecol. apl. [online]. 2003, vol.2, n.1, pp.111-115. ISSN 1726-2216.

Environmental Risk Assessment (ERA) for mercury in marine environment needs the use of bioindicator species. Biological organisms coming from localities with different environmental influences are known to exhibit variable responses in ecotoxicological bioassays. Emerita analoga (Stimpson) is an invertebrate component of marine sand macrozoobenthos in the Peruvian Central coast. The ecotoxicological acute effects of mercury (Hg2+) on larvae of E. analoga from four beaches of Lima, Peru: Santa María del Mar, Conchan, El Silencio and Puerto Viejo were determined. Less than 24 h larvae were obtained from ovigerous females in October and November of 1999. They were fed with the Nannochloris sp. microalga and were evaluated using marine water with UV light. A completely randomized block design was employed with 6 concentrations x 4 repetitions. Ecotoxicological assays at 48 h and 96 h exposure showed a value of average Lethal medium concentration (LC50) of 14,20 mg L-1 and 7,48 mg L-1, respectively. Non Observed Effect Concentration (NOEC) and Lowest Observed Effect Concentration (LOEC) were 0,65 mg L-1 and 1,63 mg L-1 at 96 h exposure, respectively. Non significant differences in values of LC50 among the four localities evaluated were observed. Variability coefficient (VC) of LC50 was acceptable (VC48h = 26.51 % and VC96h = 40,94 %). The results were compared with other species of aquatic crustaceans at the global level. Perspectives of use of E. analoga as a toxicity bioindicador organism were analyzed.

Keywords : Crustacea; Emerita; macrozoobenthos; mercury; toxicity.

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