Ecological risk assessment of metals and As in the Limoncocha lagoon sediments, a Ramsar site in the Ecuadorian Amazon region
Author(s): Coral Carrillo K; Rodríguez-Romero A; Tovar-Sánchez A; Ruiz-Gutiérrez G; Galán Corta B; Viguri Fuente JR;
Presenter: Javier R. Viguri Fuente
Wetlands of international importance require regular reporting of key indicators to guide management and track ecosystem change effectively. Limoncocha Biological Reserve (Ecuador), a Ramsar site with high ecological and socioeconomic value, has a hydrologic system mainly formed by two rivers that drain into the Limoncocha lagoon, which concentrates increasingly anthropic activities. A strategy based on the application of a combination of single and integrated indices has been widely enforced in order to obtain a more accuracy assessment of the studied area.This study assess the ecological risk of As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, V and Zn in sediments of the Limoncocha lagoon applying single and integrated pollution indices based on background values, on the reference element and the background concentration, indices including toxic response and indices based on the Sediment Quality Guidelines. Seven sediment sites were analysed for metal(oid)s by ICP-MS. The contamination factor (Cf_(i,j)) and the enrichment factor (Ef_(i,j)) are used as individual indices to estimate the degree of contamination of each potentially toxic element. The Nemerow Pollution Index (NPI_j), the modified Nemerow Pollution Index (mNPI_j), and the potential ecological risk index (RI_j), are used as integrated indices to determine the degree of contamination of the set of pollutants. The evaluation of the sediment quality with respect to potentially toxic elements is determined using freshwater Sediment Quality Guidelines (SQGs) based indices. Under this approach, the probable median effect level quotient mPELq, the effective range median mean quotient mERMq and the toxic risk index TRI based on TEL and PEL guidelines, have been used. Cf and Ef classify the sediment sites in the same contamination level, from a “low contamination” remote site, to the “moderate contamination” and “minor enrichment” of the remaining sites showing the same elements As, Cd and Zn as responsible of such as categorization. NPI and mNPI identify three groups of stations, the centre of the lagoon as “moderately polluted”, a remote site as “unpolluted” and the remaining five sites as “slightly polluted”. In contrast, RI, mPELq, mERMq and TRI classify homogeneously all sediment stations as “Low potential risk (RI<150)”, “Medium-low priority risk level (0.1
Funding: Dr. Araceli Rodríguez-Romero is supported by the Spanish grant Juan de la Cierva Incorporación referenced as IJC2018–037545-I.
Keywords: Sediment Quality Guidelines; Pollution Indices; Monitoring Program
Graduada em Ciências Biológicas pela Universidade Federal de São Carlos (1985) com mestrado em Ciências (Fisiologia Geral) pela Universidade de São Paulo (1990). Realizou o doutorado no Departamento de Fisiologia Geral do IBUSP e no Departamento de Zoologia da Universidade de Leicester, Inglaterra e...Saiba mais
2000-Present Professor Aquatic Ecotoxicology, University of California, Riverside, CA USA
1995-1999 Associate Professor Pharmacology and Environmental Toxicology, University of Mississippi, MS USA
1991-1995 Assistant professor Pharmacology and Toxicology, University of Arkansas for Medi...
Gisela de Aragão Umbuzeiro is a full professor at School of Technology – UNICAMP, Brazil and an adjunct professor at Wilson College of Textiles, NCSU, USA. She graduated in Biology at University of Campinas - UNICAMP (1979), Ph.D. in Genetics also at UNICAMP (1990). Worked for 22 years at the Enviro...Saiba mais
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