Impact of urban pollution on freshwater biofilms: Oxidative stress, photosynthesis and lipid responses
2024
Roux, Caroline | Madru, Cassandre | Millan-Navarro, Débora | Jan, Gwilherm | Mazzella, Nicolas | Moreira, Aurélie | Vedrenne, Jacky | Carassou, Laure | Morin, Soizic | Ecosystèmes aquatiques et changements globaux (UR EABX) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | MetaboHUB-Bordeaux ; MetaboHUB | AQUA INRAE | Nature Division of Bordeaux Métropole (Biodiver'Cité2 -with funding from Bordeaux Metropole, Agence de l'Eau Adour Garonne, Département de la Gironde, Région Nouvelle-Aquitaine)
International audience
显示更多 [+] 显示较少 [-]英语. Urban ecosystems are subjected to multiple anthropogenic stresses, which impact aquatic communities. Artificiallight at night (ALAN) for instance can significantly alter the composition of algal communities as well as thephotosynthetic cycles of autotrophic organisms, possibly leading to cellular oxidative stress. The combined effects of ALAN and chemical contamination could increase oxidative impacts in aquatic primary producers,although such combined effects remain insufficiently explored. To address this knowledge gap, a one-monthexperimental approach was implemented under controlled conditions to elucidate effects of ALAN and dodecylbenzyldimethylammonium chloride (DDBAC) on aquatic biofilms. DDBAC is a biocide commonly used invirucidal products, and is found in urban aquatic ecosystems. The bioaccumulation of DDBAC in biofilms exposedor not to ALAN was analyzed. The responses of taxonomic composition, photosynthetic activity, and fatty acidcomposition of biofilms were examined. The results indicate that ALAN negatively affects photosynthetic yieldand chlorophyll production of biofilms. Additionally, exposure to DDBAC at environmental concentrations induces lipid peroxidation, with an increase of oxylipins. This experimental study provides first insights on theconsequences of ALAN and DDBAC for aquatic ecosystems. It also opens avenues for the identification of newbiomarkers that could be used to monitor urban pollution impacts in natural environments.
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