RT Journal Article
T1 Using single-species and algal communities to determine long-term adverse effects of silver nanoparticles on freshwater phytoplankton
A1 Cortés Téllez, Alondra A.
A1 D'Ors De Blas, Ana
A1 Sánchez Fortún, A.
A1 Fajardo, C.
A1 Mengs, G.
A1 Nande Barbeitos, María Del Mar
A1 Martín, C.
A1 Costa Buitrago, Gonzalo Antonio
A1 Martín, M.
A1 Bartolomé Camacho, María del Carmen
A1 Sánchez-Fortún Rodríguez, Sebastián
A2 Barceló, Damià
AB The physical and chemical properties of silver nanoparticles (AgNPs) have led to their increasing use in various fields such as medicine, food, and industry. Evidence has proven that AgNPs cause adverse effects in aquatic ecosystems, especially when the release of Ag is prolonged in time. Several studies have shown short-term adverse effects of AgNPs on freshwater phytoplankton, but few studies have analysed the impact of long-term exposures on these populations. Our studies were carried out to assess the effects of AgNPs on growth rate, photosynthesis activity, and reactive oxygen species (ROS) generation on the freshwater green algae Scenedesmus armatus and the cyanobacteria Microcystis aeruginosa, and additionally on microcystin (MC-LR) generation from these cyanobacteria. The tests were conducted both in single-species cultures and in phytoplanktonic communities exposed to 1 ngL-1 AgNPs for 28 days. The results showed that cell growth rate of both single-species cultures decreased significantly at the beginning and progressively reached control-like values at 28 days post-exposure. This effect was similar for the community-cultured cyanobacteria, but not for the green algae, which maintained a sustained decrease in growth rate. While gross photosynthesis (Pg) increased in both strains exposed in single cultures, dark respiration (R) and net photosynthesis (Pn) decreased in S. armatus and M. aeruginosa, respectively. These effects were mitigated when both strains were exposed under community culture conditions. Similarly, the ROS generation shown by both strains exposed in single-species cultures was mitigated when exposure occurred in community cultures. MC-LR production and release were significantly decreased in both single-species and community exposures. These results can supply helpful information to further investigate the potential risks of AgNPs and ultimately help policymakers make better-informed decisions about their utilization for environmental restoration.
PB Elsevier
SN 0048-9697
YR 2024
FD 2024-04-18
LK https://hdl.handle.net/20.500.14352/103539
UL https://hdl.handle.net/20.500.14352/103539
LA eng
NO CRediT authorship contribution statement: A.A. Cortes-Tellez: Writing – original draft, Visualization, Investigation, Formal analysis. A. D’ors: Visualization, Investigation, Formal analysis. C. Fajardo: Visualization, Supervision, Investigation. G. Mengs: Software, Investigation. M. Nande: Software, Investigation. C. Martín: Visualization, Investigation. G. Costa: Visualization, Investigation. M. Martín: Visualization, Supervision, Investigation, Funding acquisition. M.C. Bartolome-Camacho: Writing – original draft, Supervision, Investigation. S. Sanchez-Fortún: Writing – original draft, Investigation, Formal analysis.
NO Ministerio de Ciencia, Innovación y Universidades (España)
DS Docta Complutense
RD 25 ago 2024