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A preliminary assessment of the effects ofDidymosphenia geminatanuisance growths on the structure and diversity of diatom assemblages of the Restigouche River basin, Quebec, Canada.

Gillis, Carole-Anne; Lavoie, Isabelle (2014). A preliminary assessment of the effects ofDidymosphenia geminatanuisance growths on the structure and diversity of diatom assemblages of the Restigouche River basin, Quebec, Canada. Diatom Research , vol. 29 , nº 3. p. 281-292. DOI: 10.1080/0269249X.2014.924437.

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Résumé

In June 2006, blooms of Didymosphenia geminata (Lyngbye) M. Schmidt were observed for the first time in the Matapedia River, Quebec. This species can produce nuisance-level epilithic algal mats in oligotrophic rivers with stable flows. The lack of knowledge surrounding the potential impacts of nuisance growths on lotic ecosystems has raised concerns. Periphyton communities were sampled in three rivers of the Restigouche watershed to assess the effects of D. geminata nuisance growths on surrounding diatom assemblages. This study provides a preliminary assessment of the effect of D. geminata on the species composition of diatom assemblages and the influence of increased biofilm complexity on species diversity. Our results show that D. geminata mats have an effect on the structure and diversity of diatom assemblages. Conversely, we found no evidence that an increase in Standing Crop Index (SCI) further impacted diatom diversity or structure of these assemblages. This preliminary study contributes to the growing knowledge of the biology and impact of D. geminata in lotic environments.

Type de document: Article
Mots-clés libres: Didymosphenia geminata; nuisance alga; diatom assemblages; didymo; periphyton; EDAB; Quebec
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 avr. 2018 19:01
Dernière modification: 18 avr. 2018 19:01
URI: http://espace.inrs.ca/id/eprint/6903

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