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Article: Short-term arsenic exposure reduces diatom cell size in biofilm communities

TitleShort-term arsenic exposure reduces diatom cell size in biofilm communities
Authors
Issue Date2016
Citation
Environmental Science and Pollution Research, 2016, v. 23, p. 4257-4270 How to Cite?
AbstractArsenic (As) pollution in water has important impacts for human and ecosystem health. In freshwaters, arsenate (AsV) can be taken up by microalgae due to its similarity with phosphate molecules, its toxicity being aggravated under phosphate depletion. An experiment combining ecological and ecotoxicological descriptors was conducted to investigate the effects of AsV (130 μg L−1 over 13 days) on the structure and function of fluvial biofilm under phosphate-limiting conditions. We further incorporated fish (Gambusia holbrooki) into our experimental system, expecting fish to provide more available phosphate for algae and, consequently, protecting algae against As toxicity. However, this protection role was not fully achieved. Arsenic inhibited algal growth and productivity but not bacteria. The diatom community was clearly affected showing a strong reduction in cell biovolume; selection for tolerant species, in particular Achnanthidium minutissimum; and a reduction in species richness. Our results have important implications for risk assessment, as the experimental As concentration used was lower than acute toxicity criteria established by the USEPA.
Persistent Identifierhttp://hdl.handle.net/10722/230291

 

DC FieldValueLanguage
dc.contributor.authorBarral-Fraga, L-
dc.contributor.authorMorin, M-
dc.contributor.authorRovira, MDM-
dc.contributor.authorUrrea, G-
dc.contributor.authorMagellan, KMEG-
dc.contributor.authorGuasch, H-
dc.date.accessioned2016-08-23T14:16:12Z-
dc.date.available2016-08-23T14:16:12Z-
dc.date.issued2016-
dc.identifier.citationEnvironmental Science and Pollution Research, 2016, v. 23, p. 4257-4270-
dc.identifier.urihttp://hdl.handle.net/10722/230291-
dc.description.abstractArsenic (As) pollution in water has important impacts for human and ecosystem health. In freshwaters, arsenate (AsV) can be taken up by microalgae due to its similarity with phosphate molecules, its toxicity being aggravated under phosphate depletion. An experiment combining ecological and ecotoxicological descriptors was conducted to investigate the effects of AsV (130 μg L−1 over 13 days) on the structure and function of fluvial biofilm under phosphate-limiting conditions. We further incorporated fish (Gambusia holbrooki) into our experimental system, expecting fish to provide more available phosphate for algae and, consequently, protecting algae against As toxicity. However, this protection role was not fully achieved. Arsenic inhibited algal growth and productivity but not bacteria. The diatom community was clearly affected showing a strong reduction in cell biovolume; selection for tolerant species, in particular Achnanthidium minutissimum; and a reduction in species richness. Our results have important implications for risk assessment, as the experimental As concentration used was lower than acute toxicity criteria established by the USEPA.-
dc.languageeng-
dc.relation.ispartofEnvironmental Science and Pollution Research-
dc.titleShort-term arsenic exposure reduces diatom cell size in biofilm communities-
dc.typeArticle-
dc.identifier.emailMagellan, KMEG: magellan@hku.hk-
dc.identifier.doi10.1007/s11356-015-4894-8-
dc.identifier.hkuros262051-
dc.identifier.volume23-
dc.identifier.spage4257-
dc.identifier.epage4270-

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