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Silver stress differentially affects growth of phototrophic and heterotrophic chrysomonad flagellate populations

Title data

Bock, Christina ; Zimmermann, Sonja ; Beisser, Daniela ; Dinglinger, Sarah-Maria ; Engelskirchen, Simone ; Giesemann, Philipp ; Klink, Saskia ; Olefeld, Jana L. ; Rahmann, Sven ; Vos, Matthijs ; Boenigk, Jens ; Sures, Bernd:
Silver stress differentially affects growth of phototrophic and heterotrophic chrysomonad flagellate populations.
In: Environmental Pollution. Vol. 244 (January 2019) . - pp. 314-322.
ISSN 1873-6424
DOI: https://doi.org/10.1016/j.envpol.2018.09.146

Abstract in another language

Silver ions are among the predominant anthropogenic introduced pollutantsin aquatic systems. As silverhas effects on species at all trophic levels the community composition in aquatic habitats can be changed as a result of silver stress. The response of planktonic protists to environmental stressors is particularly important as they act both as producers and consumers in complex planktonic communities. Chrysomonad flagellates are of major interest, since this group includes heterotrophic, mixotrophic and phototrophic taxa, and therefore allows analysis of silver stress in organisms with contrasting nutritionalstrategies independent of a potential taxonomic bias. In a series of lab experiments, we compared the response of different trophic chrysophyte strains to low (5 mg L¹), medium (10 mg L¹) and high (20 mg L¹) nominal Ag concentrations in combination with changes in temperature and light intensity (phototrophs), temperature and food concentration (heterotrophs), or a combination of the above settings (mixotrophs). All tested strains were negatively affected by silver in their growth rates. The phototrophic strains reacted strongly to silver stress, whereas light intensity andtemperature had only minor effects on growth rates. For heterotrophic strains, high food concentration toned down the effectof silver, whereas temperatures outside the growth optimum had a combined stress effect. The mixotrophic strains reacted differently depending on whether their nutritional mode was dominated by heterotrophy or by phototrophy. The precise response pattern across all variables was uniquely different for every single species we tested. The present work contributes to a deeper understanding of the effectsof environmental stressors on complex planktonic communities. It indicates that silver will negatively impact planktonic communities and may create shifts in their composition and functioning.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER148388
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 25 Mar 2019 09:34
Last Modified: 25 Mar 2019 09:34
URI: https://eref.uni-bayreuth.de/id/eprint/48066