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Effect of salinity on valves morphology in freshwater diatoms

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Abstract

Increased salt concentration is one of the most widespread problems affecting freshwater worldwide. Aquatic communities, and in particular periphytic diatoms, react to this alteration in water quality by modifying their structural parameters and physiology at the individual level, which is commonly manifested by the appearance of teratological forms. The present work presents the results of an experimental laboratory study in which a biofilm grown on artificial substrates was subjected to a gradient of water conductivities for 4 weeks. The results show an increase in the number of deformed valves over time proportionally to the increase in conductivity for each experimental treatment. These effects are also verified by analyzing the concentration of chlorophyll-a in the experimental biofilms, which demonstrate a metabolic response to the induced osmotic stress. No changes were recorded; however, in species richness or diversity of taxa present in the treatments. Our results, therefore, confirm at the experimental level numerous previous field observations about the harmful effect of salinity on periphytic diatoms, and also their ability to reintegrate with the new stress conditions.

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Acknowledgements

The present work was financially supported by the Algerian Ministry of Higher Education and Scientific Research and the University of 20 August 1955 (Skikda, Algeria) under the university training research project (PRFU) code A16N01UN210120180002. We express our thanks to the team of the Diatom Laboratory (University of León, Spain) for their assistance during the experiment. Special thanks to Óscar Fernández and Adrián Llamazares for their precious technical help.

Funding

The present work was funded by the Algerian Ministry of Higher Education and Scientific Research and the University of 20 August 1955 (Skikda, Algeria), and it fits into the university training research project (PRFU) carrying the code A16N01UN210120180002.

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Authors and Affiliations

  1. Department of Natural and Life Sciences, Faculty of Sciences, University of 20 August 1955, Skikda, Algeria

    Faïza Noune, Hadjer Kaddeche & Sophia Metallaoui

  2. Laboratoire de Recherche Sur La Physico-Chimie des Surfaces Et Interfaces (LRPCSI), University of 20 August 1955, Skikda, Algeria

    Faïza Noune, Hadjer Kaddeche & Sabrina Dzizi

  3. Department of Process Engineering, Faculty of Technology, University of 20 August 1955, Skikda, Algeria

    Nadjla Chaib & Sabrina Dzizi

  4. Laboratory of Catalysis, Bioprocesses and Environment – LCBE, University of 20 August 1955, Skikda, Algeria

    Nadjla Chaib

  5. Laboratoire de Recherche des Interactions, Biodiversité, Ecosystèmes et Biotechnologie (LRIBEB), University of 20 August 1955, Skikda, Algeria

    Sophia Metallaoui

  6. Departamento de Biodiversidad y Gestión Ambiental, Facultad de Ciencias Biológicas y Ambientales, Universidad de León, Campus de Vegazana S/N, 24071, León, Spain

    Saùl Blanco

  7. Laboratorio de Diatomología, La Serna 58, 24007, León, Spain

    Saùl Blanco

Authors
  1. Faïza Noune
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  2. Nadjla Chaib
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  3. Hadjer Kaddeche
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  4. Sabrina Dzizi
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  5. Sophia Metallaoui
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  6. Saùl Blanco
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Contributions

Faïza Noune conceptualization, methodology, formal analysis, investigation, data curation, writing—original draft, visualization. Nadjla Chaib conceptualization, methodology, investigation, visualization, validation, formal analysis, writing—review and editing, supervision, project administration, funding acquisition. Hadjer Kaddeche conceptualization, methodology, investigation. Sabrina Dzizi methodology, investigation, validation. Sofia Metallaoui validation, writing—review and editing. Saùl Blanco conceptualization, methodology, investigation, visualization, validation, formal analysis, data curation, writing—review and editing, supervision, project administration, funding acquisition.

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Correspondence to Faïza Noune.

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Noune, F., Chaib, N., Kaddeche, H. et al. Effect of salinity on valves morphology in freshwater diatoms. Environ Monit Assess 195, 159 (2023). https://doi.org/10.1007/s10661-022-10770-w

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