Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water
Benthic diatoms are unicellular, brown algae with siliceous cell walls. They are often used to show water quality in river sand lakes. Benthic diatoms can show elevated nutrient levels, very acid conditions, pollution by organic matter and probably also pollution by heavy metals, which makes them us...
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| Formato: | Second cycle, A2E |
| Lenguaje: | sueco Inglés |
| Publicado: |
2012
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| Acceso en línea: | https://stud.epsilon.slu.se/4994/ |
| _version_ | 1855570773264039936 |
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| author | Naghavian, Navid |
| author_browse | Naghavian, Navid |
| author_facet | Naghavian, Navid |
| author_sort | Naghavian, Navid |
| collection | Epsilon Archive for Student Projects |
| description | Benthic diatoms are unicellular, brown algae with siliceous cell walls. They are often used to show water quality in river sand lakes. Benthic diatoms can show elevated nutrient levels, very acid conditions, pollution by organic matter and probably also pollution by heavy metals, which makes them useful biological indicator species. Observed impact of metal pollution on benthic diatoms are reductions in cell number, valve malformation and reduction of some diatom taxa which leads to a change in community structure. The present study is focusing on the impact of the heavy metal zinc.
In aquatic environments, zinc exists in form of divalent cation Zn2+, hydrated zinc (pH=4-7) and moderately weak complexes. At higher pH (7-10) Zn2+ is replaced by adsorbed Zinc (ZnFe(OH)3), or aqueous ZnCO3and Zn(OH)2.. Zinc release to soil and aquatic environments may be from mining, smelting metals, steel production, waste incineration, burning coal and fossil fuel.
Two hypotheses were tested in laboratory experiments in the present project:
1. The culture of benthic diatoms is possible under the given laboratory (artificial) conditions.
2. High concentrations of zinc (300μg/l zinc) decrease the number of benthic diatoms and increase abnormalities in cell walls.
The first hypothesis “The culture of benthic diatoms is possible under the given laboratory (artificial) conditions.” was confirmed. Diatom cell numbers increased during the course of the first experiment.
The second hypothesis that “High concentrations of zinc (300μg/l zinc) decrease the number of benthic diatoms and increase abnormalities in cell walls.” was not confirmed by this experiment, possibly due to the loss of the toxic zinc form from solution over time. |
| format | Second cycle, A2E |
| id | RepoSLU4994 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2012 |
| publishDateSort | 2012 |
| record_format | eprints |
| spelling | RepoSLU49942012-11-07T10:08:50Z https://stud.epsilon.slu.se/4994/ Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water Naghavian, Navid Aquatic ecology Water resources and management Pollution Benthic diatoms are unicellular, brown algae with siliceous cell walls. They are often used to show water quality in river sand lakes. Benthic diatoms can show elevated nutrient levels, very acid conditions, pollution by organic matter and probably also pollution by heavy metals, which makes them useful biological indicator species. Observed impact of metal pollution on benthic diatoms are reductions in cell number, valve malformation and reduction of some diatom taxa which leads to a change in community structure. The present study is focusing on the impact of the heavy metal zinc. In aquatic environments, zinc exists in form of divalent cation Zn2+, hydrated zinc (pH=4-7) and moderately weak complexes. At higher pH (7-10) Zn2+ is replaced by adsorbed Zinc (ZnFe(OH)3), or aqueous ZnCO3and Zn(OH)2.. Zinc release to soil and aquatic environments may be from mining, smelting metals, steel production, waste incineration, burning coal and fossil fuel. Two hypotheses were tested in laboratory experiments in the present project: 1. The culture of benthic diatoms is possible under the given laboratory (artificial) conditions. 2. High concentrations of zinc (300μg/l zinc) decrease the number of benthic diatoms and increase abnormalities in cell walls. The first hypothesis “The culture of benthic diatoms is possible under the given laboratory (artificial) conditions.” was confirmed. Diatom cell numbers increased during the course of the first experiment. The second hypothesis that “High concentrations of zinc (300μg/l zinc) decrease the number of benthic diatoms and increase abnormalities in cell walls.” was not confirmed by this experiment, possibly due to the loss of the toxic zinc form from solution over time. 2012-10-23 Second cycle, A2E NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/4994/11/naghavian_n_121107.pdf Naghavian, Navid, 2012. Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water. Second cycle, A2E. Uppsala: (NL, NJ) > Dept. of Aquatic Sciences and Assessment <https://stud.epsilon.slu.se/view/divisions/OID-280.html> urn:nbn:se:slu:epsilon-s-1807 eng |
| spellingShingle | Aquatic ecology Water resources and management Pollution Naghavian, Navid Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water |
| title | Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water |
| title_full | Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water |
| title_fullStr | Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water |
| title_full_unstemmed | Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water |
| title_short | Experimental zinc stress on benthic diatoms assemblage growth in Fyrisån water |
| title_sort | experimental zinc stress on benthic diatoms assemblage growth in fyrisån water |
| topic | Aquatic ecology Water resources and management Pollution |
| url | https://stud.epsilon.slu.se/4994/ https://stud.epsilon.slu.se/4994/ |