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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tuulaikhuu, Baigal-Amar Romaní, Anna M. Guasch, Helena |
| Description | Author Affiliation: Tuulaikhuu BA ( Institute of Aquatic Ecology, Department of Environmental Sciences, University of Girona, Spain. Electronic address: baigal.tuulaikhuu@udg.edu.); Romaní AM ( Institute of Aquatic Ecology, Department of Environmental Sciences, University of Girona, Spain.); Guasch H ( Institute of Aquatic Ecology, Department of Environmental Sciences, University of Girona, Spain. Electronic address: helena.guasch@udg.edu.) |
| Abstract | The toxicity of chemicals in the environment is influenced by many factors, such as the adsorption to mineral particles, active biological surfaces, biotransformation and/or nutrient concentration. In the present study, a simplified fluvial system including fish, periphyton and sediment was used to investigate the fate and effects of environmentally realistic concentration of arsenic (As) on biofilm growth and nutrient cycling. Total dissolved arsenic concentration decreased exponentially from 120µg/L to 28.0±1.5µg/L during the experiment (60 days), mostly sinking to the sediment and a smaller percentage accumulated in the periphytic biofilm. Most P and N, which was provided by fish, was also retained in the epipsammic biofilm (growing on sediment grains). We conclude that exposure to this concentration of arsenic under oligotrophic conditions is changing the quality and quantity of the base of the aquatic food chain and its respective contribution to nutrient cycling, and normal functioning of the ecosystem. The effects include lowering the total biomass of biofilm and its potential ability to use organic P (i.e., phosphatase activity), inhibiting algal growth, especially that of diatoms, decreasing nitrogen content, and making the epipsammic biofilm more heterotrophic, thus reducing its ability to oxygenate the aquatic environment. |
| File Format | HTM / HTML |
| ISSN | 0166445X |
| Volume Number | 166 |
| e-ISSN | 18791514 |
| Journal | Aquatic Toxicology |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-09-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Toxicology Arsenic Toxicity Biofilms Drug Effects Ecosystem Microbiota Physiology Water Pollutants, Chemical Animals Diatoms Metabolism Fishes Nitrogen Phosphorus Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Health, Toxicology and Mutagenesis Aquatic Science |
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