Temperature modulates phototrophic periphyton response to chronic copper exposure - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Environmental Pollution Année : 2016

Temperature modulates phototrophic periphyton response to chronic copper exposure

Modulation par la température de la réponse du périphyton à une exposition chronique au cuivre

Résumé

Streams located in vineyard areas are highly prone to metal pollution. In a context of global change, aquatic systems are generally subjected to multi-stress conditions due to multiple chemical and/or physical pressures. Among various environmental factors that modulate the ecological effects of toxicants, special attention should be paid to climate change, which is driving an increase in extreme climate events such as sharp temperature rises. In lotic ecosystems, periphyton ensures key ecological functions such as primary production and nutrient cycling. However, although the effects of metals on microbial communities are relatively well known, there is scant data on possible interactions between temperature increase and metal pollution. Here we led a study to evaluate the influence of temperature on the response of phototrophic periphyton to copper (Cu) exposure. Winter communities, collected in a 8 °C river water, were subjected for six weeks to four thermal conditions in microcosms in presence or not of Cu (nominal concentration of 15 mg L-1). At the initial river temperature (8 °C), our results confirmed the chronic impact of Cu on periphyton, both in terms of structure (biomass, distribution of algal groups, diatomic composition) and function (photosynthetic efficiency). At higher temperatures (13, 18 and 23 °C), Cu effects were modulated. Indeed, temperature increase reduced Cu effects on algal biomass, algal class proportions, diatom assemblage composition and photosynthetic efficiency. This reduction of Cu effects on periphyton may be related to lower bioaccumulation of Cu and/or to selection of more Cu-tolerant species at higher temperatures.
Fichier non déposé

Dates et versions

hal-02602562 , version 1 (16-05-2020)

Identifiants

Citer

A.S. Lambert, A. Dabrin, Soizic Morin, J. Gahou, A. Foulquier, et al.. Temperature modulates phototrophic periphyton response to chronic copper exposure. Environmental Pollution, 2016, 208, pp.821-829. ⟨10.1016/j.envpol.2015.11.004⟩. ⟨hal-02602562⟩
12 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More