Bibliothèque Électronique Lac Saint-Pierre

Presence of algae in freshwater ice cover of fluvial lac Saint-Pierre

Frenette, J.-J. et Thibeault, P. et Lapierre, J.-F. et Hamilton, P.B. (2008). Presence of algae in freshwater ice cover of fluvial lac Saint-Pierre. Journal of Phycology , 44 . p. 284-291. DOI: 10.1111/j.1529-8817.2008.00481.x.

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Résumé

Winter ice cover is a fundamental feature of north temperate aquatic systems and is associated with the least productive months of the year. Here we describe a previously unknown freshwater habitat for algal and microbial communities in the ice cover of the freshwater St. Lawrence River, Quebec, Canada. Sampling performed during winter 2005 revealed the presence of viable algal cells, such as Aulacoseira islandica (O. Mu¨ll.) Simonsen (Bacillariophyceae), and microbial assemblage growing in the ice and at the ice–water interface. Vertical channels (1–5 mm wide) containing algae were also observed. Concentrations of chl a ranged between 0.5 and 169 l g Æ L)1 of melted ice, with maximal concentrations found in the lower part of the ice cores. These algae have the potential to survive when ice breakup occurs and reproduce rapidly in spring ⁄ summer conditions. Freshwater ice algae can thus contribute to in situ primary production, biodiversity, and annual carbon budget in various habitats of riverine communities.

Type de document: Article scientifique
Statut du texte intégral: Autre
Mots-clés libres: Bacillariophyceae, Chlorophyta, Fluvial lake, Freshwater, Ice algae, Protist, Spatial distribution, Sympagic communities, Temperate ecosystem, Vertical channel
Sujets: 2. Milieu physique > 2.3. Climatologie
3. Végétation, milieux humides
Date de dépôt: 30 juin 2016 15:46
Dernière modification: 30 juin 2016 15:46
URI: http://belsp.uqtr.ca/id/eprint/223

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Concepteur de la BELSP : André Barabé, Ph. D.