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Modeling the response time of diatom assemblages to simulated water quality improvement and degradation in running waters.

Lacoursière, Sophie, Sprules, Gary, Lavoie, Isabelle ORCID: https://orcid.org/0000-0002-2918-6297, Rodríguez, Marco A. et Campeau, Stéphane (2011). Modeling the response time of diatom assemblages to simulated water quality improvement and degradation in running waters. Canadian Journal of Fisheries and Aquatic Sciences , vol. 68 , nº 3. p. 487-497. DOI: 10.1139/F10-162.

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Résumé

The objective of this study was to measure and model the response time of the Eastern Canadian Diatom Index (IDEC: Indice Diatomées de l’Est du Canada), a diatom-based index of biological integrity, following substrate translocation from altered sites (nutrient-enriched) to pristine sites and vice-versa. The frequency of sampling, duration (time after substrate translocation), and variety of site conditions in the present study provide strong evidence for an accelerated response of diatoms to a degradation reflecting eutrophication (within a week in certain cases) and a slower path to recovery (up to 4 weeks). Diatom response varied as a function of trophic status; oligotrophic rivers responded rapidly to a degradation, and mesotrophic or eutrophic rivers responded more slowly to an amelioration of the conditions. Variation in response time as a function of trophic status seemed to be partly linked to the diversity and complexity of the assemblages. The less diverse assemblages observed in oligotrophic waters were highly sensitive to nutrient enrichment, whereas the more diverse assemblages sampled in mesotrophic–eutrophic rivers were less sensitive to nutrient fluctuations, and major variations in nutrient concentrations took a longer time to induce a change in index values

Type de document: Article
Mots-clés libres: diatomées; rivières;
Centre: Centre Eau Terre Environnement
Date de dépôt: 04 août 2022 12:57
Dernière modification: 04 août 2022 12:57
URI: https://espace.inrs.ca/id/eprint/10633

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