Experimental warming differentially influences the vulnerability of phototrophic and heterotrophic periphytic communities to copper toxicity - Archive ouverte HAL Access content directly
Journal Articles Frontiers in Microbiology Year : 2018

Experimental warming differentially influences the vulnerability of phototrophic and heterotrophic periphytic communities to copper toxicity

Une hausse thermique artificielle impact différemment la vulnérabilité des communautés microbiennes périphytiques phototrophes et hétérotrophes à la toxicitié du cuivre

(1) , (1) , (2) , (1, 3) , (1) , (1)
1
2
3
Stéphane Pesce
A.S. Lambert
  • Function : Author
Soizic Morin
Marina Coquery
Aymeric Dabrin

Abstract

Aquatic ecosystems are generally subjected to multiple perturbations due to simultaneous or successive combinations of various natural and anthropogenic environmental pressures. To better assess and predict the resulting ecological consequences, increasing attention should be given to the accumulation of stresses on freshwater ecosystems and its effects on the vulnerability of aquatic organisms, including microbial communities, which play crucial functional roles. Here we used a microcosm study to assess the influence of an experimental warming on the vulnerability of phototrophic and heterotrophic periphytic communities to acute and chronic copper (Cu) toxicity. Natural periphytic communities were submitted for 4 weeks to three different temperatures (18, 23, and 28°C) in microcosms contaminated (at about 15 µg L-1) or not with Cu. The vulnerability of both phototrophic and heterotrophic microbial communities to subsequent acute Cu stress was then assessed by measuring their levels of sensitivity to Cu from bioassays targeting phototrophic (photosynthetic activity) and heterotrophic (β-glucosidase and leucine aminopeptidase extracellular enzymatic activities) microbial functions. We postulated that both the increase in temperature and the chronic Cu exposure would modify microbial community structure, thus leading to changes in the capacity of phototrophic and heterotrophic communities to tolerate subsequent acute exposure to Cu. Our results demonstrated that the influence of temperature on the vulnerability of phototrophic and heterotrophic microbial communities to Cu toxicity can vary greatly according to function studied. These findings emphasize the importance of considering different functional compartments and different functional descriptors to better assess the vulnerability of periphyton to multiple stresses and predict the risks induced by multiple stressors for ecosystem balance and functioning.
Fichier principal
Vignette du fichier
ly2018-pub00059042.pdf (1.25 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-01927765 , version 1 (20-11-2018)

Identifiers

Cite

Stéphane Pesce, A.S. Lambert, Soizic Morin, A. Foulquier, Marina Coquery, et al.. Experimental warming differentially influences the vulnerability of phototrophic and heterotrophic periphytic communities to copper toxicity. Frontiers in Microbiology, 2018, 9, pp.1424-1438. ⟨10.3389/fmicb.2018.01424⟩. ⟨hal-01927765⟩
38 View
51 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More