Accelerated eutrophication and toxicity in tropical reservoir water and sediments: an ecotoxicological approach
| Autor: | Odete Rocha, C. R. Botta, Arnola Cecília Rietzler, Ana Lúcia Fonseca, Marília Cleto Meirelles Ribeiro |
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| Přispěvatelé: | Universidade Federal de Minas Gerais (UFMG), Universidade Estadual Paulista (Unesp), Universidade Federal de São Carlos (UFSCar), Univ Fed Itajuba |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Geologic Sediments Health Toxicology and Mutagenesis Cladocerans Remediation Fresh Water 010501 environmental sciences Ecotoxicology Cyanobacteria 01 natural sciences Daphnia Freshwater contaminants Ammonia Animals Environmental Chemistry Water pollution Chronic toxicity 0105 earth and related environmental sciences Pollutant Tropical Climate biology Ecology 010604 marine biology & hydrobiology Ceriodaphnia dubia General Medicine Eutrophication Cladocera biology.organism_classification Pollution Metals Environmental chemistry Environmental science Water quality Brazil Water Pollutants Chemical |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2018-11-26T16:01:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-05-01 The aim of this study was to jointly show the results of three independent ecotoxicological studies performed to investigate pollutants in three Brazilian tropical reservoirs undergoing accelerated eutrophication. In order to accomplish this goal, the full toxicity identification and evaluation procedure (TIE approach) was performed, at Pampulha (Minas Gerais State) and Salto Grande and Bana Bonita reservoirs (Sao Paulo State). Acute and chronic toxicity tests were performed using the cladocerans Daphnia similis and Ceriodaphnia dubia (exotic) and Daphnia laevis and Ceriodaphnia silvestrii (native) as test organisms. Results from TIE procedure stage I indicated the existence of nonpolar organic and filterable compounds in the water from Pampulha, probably cyanotoxins, and oxidants as part of the toxic agents. TIE results for sediments identified ammonia (Pampulha and Salto Grande), organic compounds (Pampulha), metals (Pampulha, Barra Bonita, and Salto Grande), and acidity (Salto Grande) as responsible for toxicity. Whole-sediment remediation experiments for Pampulha reservoir confirmed, through reproduction decrease, ammonia and organic compounds as contaminants. Such pollutants represent threats to aquatic biota and must be prevented. Higher temperatures as predicted from global climate change will severely affect tropical shallow reservoirs, accelerating eutrophication, the release of contaminants from sediments, and increasing toxicity. Univ Fed Minas Gerais, Biol Sci Inst, Gen Biol Dept, Belo Horizonte, MG, Brazil State Univ Sao Paulo, Ctr Water Resources & Environm Studies, Sao Carlos, SP, Brazil Univ Fed Sao Carlos, Dept Ecol & Evolutionary Biol, Sao Carlos, SP, Brazil Univ Fed Itajuba, Nat Resources Inst, Itajuba, Brazil State Univ Sao Paulo, Ctr Water Resources & Environm Studies, Sao Carlos, SP, Brazil |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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