| Abstract | The effects of climate change-induced ice melting on the microbial communities in different glacial-fed aquatic systems have been reported, but seasonal dynamics remain poorly inves-tigated. In this study, the structural and functional traits of the aquatic microbial community were assessed along with the hydrological and biogeochemical variation patterns of the Arctic Pasvik River under riverine and brackish conditions at the beginning (May = Ice-melt(-)) and during the ice-melting season (July = Ice-melt(+)). The microbial abundance and morphometric analysis showed a spatial diversification between the riverine and brackish stations. Results highlighted different levels of microbial respiration and activities with different carbon and phosphorous utilization pathways, thus suggesting an active biogeochemical cycling along the river especially at the beginning of the ice-melting period. At Ice-melt(-), Gammaproteobacteria and Alphaproteobacteria were dominant in riverine and brackish stations, respectively. Conversely at Ice-melt(+), the microbial community composition was more homogeneously distributed along the river (Gammaproteobacteria>Alphaproteobacteria> Bacteroidetes). Our findings provide evidence on how riverine microbial communities adapt and respond to seasonal ice melting in glacial-fed aquatic ecosystems. |
| Authors | Papale M., Rizzo C., Caruso G., Amalfitano S., Maimone G., Miserocchi S., La Ferla R., Aspholm P.E., Decembrini F., Azzaro F., Conte A., Graziano M., Rappazzo A.C., Lo Giudice A., Azzaro M. |
| Text | 455894 2021 microbial abundance microbial activities prokaryotic biomass bacterial diversity Arctic River ice melting conditions Ice melt induced variations of structural and functional traits of the aquatic microbial community along an Arctic river Pasvik River, Norway Papale M., Rizzo C., Caruso G., Amalfitano S., Maimone G., Miserocchi S., La Ferla R., Aspholm P.E., Decembrini F., Azzaro F., Conte A., Graziano M., Rappazzo A.C., Lo Giudice A., Azzaro M. Institute of Polar Sciences, National Research Council CNR ISP , Messina, Italy; Stazione Zoologica Anton Dohrn, National Institute of Biology, Department BIOTECH, Messina, Italy; Water Research Institute, National Research Council CNR IRSA , Monterotondo RM Rome, Italy; Institute of Polar Sciences, National Research Council CNR ISP , Bologna, Italy; Norwegian Institute of Bioeconomy Research NIBIO , Svanvik, Norway; Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy The effects of climate change induced ice melting on the microbial communities in different glacial fed aquatic systems have been reported, but seasonal dynamics remain poorly inves tigated. In this study, the structural and functional traits of the aquatic microbial community were assessed along with the hydrological and biogeochemical variation patterns of the Arctic Pasvik River under riverine and brackish conditions at the beginning May = Ice melt and during the ice melting season July = Ice melt . The microbial abundance and morphometric analysis showed a spatial diversification between the riverine and brackish stations. Results highlighted different levels of microbial respiration and activities with different carbon and phosphorous utilization pathways, thus suggesting an active biogeochemical cycling along the river especially at the beginning of the ice melting period. At Ice melt , Gammaproteobacteria and Alphaproteobacteria were dominant in riverine and brackish stations, respectively. Conversely at Ice melt , the microbial community composition was more homogeneously distributed along the river Gammaproteobacteria>Alphaproteobacteria> Bacteroidetes . Our findings provide evidence on how riverine microbial communities adapt and respond to seasonal ice melting in glacial fed aquatic ecosystems. 13 Preprint 18/08/2021 Articolo in rivista Molecular Diversity Preservation International 2073 4441 Water Basel Water Basel Water Basel Water. Basel maria.papale PAPALE MARIA rosabruna.laferla LA FERLA ROSABRUNA RAPPAZZO ALESSANDRO CIRO stefano.miserocchi MISEROCCHI STEFANO gabriella.caruso CARUSO GABRIELLA franco.decembrini DECEMBRINI FRANCO filippo.azzaro AZZARO FILIPPO maurizio.azzaro AZZARO MAURIZIO stefano.amalfitano AMALFITANO STEFANO angelina.logiudice LO GIUDICE ANGELINA giovanna.maimone MAIMONE GIOVANNA |
