Interactive Impacts of Silver and Phosphorus on Autotrophic Biofilm Elemental and Biochemical Quality for a Macroinvertebrate Consumer

Frontiers in Microbiology

Aridane G. González¹  Vincent Felten²  Kévin Sanchez-Thirion²  Fanny Perrière²  Michael Danger²  Clément Crenier²  Jessica Ferriol³  Loïc Ten-Hage⁵  Alexandre Bec⁵  Joséphine Leflaive⁵ 

[1] Instituto de Oceanografía y Cambio Global, Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain;LTSER France, Zone Atelier du Bassin de la Moselle, Vandœuvre-lès-Nancy, France;Laboratoire Ecologie Fonctionnelle et Environnement, UMR 5245 CNRS-INP-UPS, Université de Toulouse, Toulouse, France;Laboratoire Interdisciplinaire des Environnements Continentaux, Université de Lorraine – Centre National de la Recherche Scientifique, Metz, France;Université Clermont Auvergne, CNRS UMR 6023, Laboratoire Microorganismes : Génome et Environnement, Clermont-Ferrand, France;

关键词: ecological stoichiometry;    essential fatty acids;    trophic ecotoxicology;    Gammarus fossarum;    multiple stressors;    benthic microalgae;   

DOI  :  10.3389/fmicb.2019.00732

来源: DOAJ

【 摘 要 】

Autotrophic biofilms are complex and fundamental biological compartments of many aquatic ecosystems. In particular, these biofilms represent a major resource for many invertebrate consumers and the first ecological barrier against toxic metals. To date, very few studies have investigated the indirect effects of stressors on upper trophic levels through alterations of the quality of biofilms for their consumers. In a laboratory study, we investigated the single and combined effects of phosphorus (P) availability and silver, a re-emerging contaminant, on the elemental [carbon (C):nitrogen (N):P ratios] and biochemical (fatty acid profiles) compositions of a diatom-dominated biofilm initially collected in a shallow lake. We hypothesized that (1) P and silver, through the replacement of diatoms by more tolerant primary producer species, reduce the biochemical quality of biofilms for their consumers while (2) P enhances biofilm elemental quality and (3) silver contamination of biofilm has negative effects on consumers life history traits. The quality of biofilms for consumers was assessed for a common crustacean species, Gammarus fossarum, by measuring organisms’ survival and growth rates during a 42-days feeding experiment. Results mainly showed that species replacement induced by both stressors affected biofilm fatty acid compositions, and that P immobilization permitted to achieve low C:P biofilms, whatever the level of silver contamination. Gammarids growth and survival rates were not significantly impacted by the ingestion of silver-contaminated resource. On the contrary, we found a significant positive relationship between the biofilm P-content and gammarids growth. This study underlines the large indirect consequences stressors could play on the quality of microbial biomass for consumers, and, in turn, on the whole food web.

【 授权许可】

Unknown