| Title | Impact of a river flood on marine water quality and planktonic microbial communities |
| Abstract | Coastal systems represent primary receptors of land-derived nutrients and pollutants, thus playing a crucial role
in carbon burial and marine productivity processes. A closer look into potential effects of river floods and following
seawater quality modifications is fundamental to specifically explore the links between the marine contamination
patterns and the planktonic microbial processes involved in carbon fluxes. Here we investigated the
effects of an extreme flood event (8603m3 s-1) from a large river (Po River, Italy) on the physical and chemical
seawater properties, along with the responses of phytoplanktonic and heterotrophic microbial communities to
riverine inputs. Following a multidisciplinary oceanographic survey conducted across three sampling transects
perpendicular to the Italian coastline, marine waters differently impacted by the river flood could be discriminated
according to the variation patterns of relevant seawater properties (i.e., temperature, salinity, dissolved
oxygen, total suspended matter). The concentrations of major nutrients and the organic matter composition (i.e.,
particulate and dissolved organic carbon, stable carbon isotopic composition, chromophoric dissolved organic
matter) were significantly higher in waters at high river flood impact levels. The total dissolved organic carbon
and the concentrations of selected inorganic and organic pollutants (i.e., heavy metals and polycyclic aromatic
hydrocarbons) were unaltered by riverine inputs, showing values similar or lower than those reported at regular
flow conditions. Moreover, the phytoplanktonic and heterotrophic microbial communities showed significant
changes linked to river flood, as revealed by a net increase of Chlorophyll-b concentrations (related to the occurrence
of freshwater algal taxa), higher prokaryotic C production rates, and shorter prokaryotic cell turnover
times in highly impacted waters. In conclusion, our results showed that an extreme river flood event could represent
a source of energy for the microbial metabolism involved in OM transformation processes, with consequences
on the microbially-driven C-flux and to the overall productivity of coastal marine systems. |
| Source | Estuarine, coastal and shelf science (Print) 224, pp. 62–72 |
| Keywords | EXTREME EVENTSRIVERINE DISCHARGECOASTAL WATERSCONTAMINATION PATTERNSMICROBIAL FUNCTIONINGC-CYCLING |
| Journal | Estuarine, coastal and shelf science (Print) |
| Editor | Academic Press in association with the Estuarine and Brackish-water Sciences Association,, New York, Stati Uniti d'America |
| Year | 2019 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.ecss.2019.04.038 |
| Authors | Zoppini A., Ademollo N., Bensi M., Berto D., Bongiorni L., Campanelli A., Casentini B., Patrolecco L., Amalfitano S. |
| Text | 402406 2019 10.1016/j.ecss.2019.04.038 Scopus 2 s2.0 85065260256 ISI Web of Science WOS WOS 000472813500007 EXTREME EVENTS RIVERINE DISCHARGE COASTAL WATERS CONTAMINATION PATTERNS MICROBIAL FUNCTIONING C CYCLING Impact of a river flood on marine water quality and planktonic microbial communities Zoppini A., Ademollo N., Bensi M., Berto D., Bongiorni L., Campanelli A., Casentini B., Patrolecco L., Amalfitano S. IRSA CNR, IRSA CNR, OGS, ISPRA, ISMAR CNR, IRBIM CNR,IRSA CNR, IRSA CNR Coastal systems represent primary receptors of land derived nutrients and pollutants, thus playing a crucial role in carbon burial and marine productivity processes. A closer look into potential effects of river floods and following seawater quality modifications is fundamental to specifically explore the links between the marine contamination patterns and the planktonic microbial processes involved in carbon fluxes. Here we investigated the effects of an extreme flood event 8603m3 s 1 from a large river Po River, Italy on the physical and chemical seawater properties, along with the responses of phytoplanktonic and heterotrophic microbial communities to riverine inputs. Following a multidisciplinary oceanographic survey conducted across three sampling transects perpendicular to the Italian coastline, marine waters differently impacted by the river flood could be discriminated according to the variation patterns of relevant seawater properties i.e., temperature, salinity, dissolved oxygen, total suspended matter . The concentrations of major nutrients and the organic matter composition i.e., particulate and dissolved organic carbon, stable carbon isotopic composition, chromophoric dissolved organic matter were significantly higher in waters at high river flood impact levels. The total dissolved organic carbon and the concentrations of selected inorganic and organic pollutants i.e., heavy metals and polycyclic aromatic hydrocarbons were unaltered by riverine inputs, showing values similar or lower than those reported at regular flow conditions. Moreover, the phytoplanktonic and heterotrophic microbial communities showed significant changes linked to river flood, as revealed by a net increase of Chlorophyll b concentrations related to the occurrence of freshwater algal taxa , higher prokaryotic C production rates, and shorter prokaryotic cell turnover times in highly impacted waters. In conclusion, our results showed that an extreme river flood event could represent a source of energy for the microbial metabolism involved in OM transformation processes, with consequences on the microbially driven C flux and to the overall productivity of coastal marine systems. 224 Published version https //doi.org/10.1016/j.ecss.2019.04.038 20/04/2019 L ATTIVITA SPERIMENTALE E STATA SVOLTA NELL AMBITO DEL PROGETTO BANDIERA RITMARE ATTIVITA SP3 WP2 AZ1 UO06 C flow and microbial communities in coastal areas at a high anthropogenic impact. Impact of a river flood on marine water quality and planktonic microbial communities REPRINT Zoppini_et_al_ ECSS_2019.pdf Impact of a river flood on marine water quality final 1_s2_0_S0272771419300319.pdf Bacterial diversity and microbial functional responses to organic matter composition and persistent organic pollutants in deltaic lagoon sediments JOURNAL PREPROOF ZOPPINI PREPROOF_ID402406.pdf Articolo in rivista Academic Press in association with the Estuarine and Brackish water Sciences Association, 0272 7714 Estuarine, coastal and shelf science Print Estuarine, coastal and shelf science Print Estuar., coast. shelf sci. Print Estuarine, coastal and shelf science. Print BENSI MANUEL luisa.patrolecco PATROLECCO LUISA stefano.amalfitano AMALFITANO STEFANO barbara.casentini CASENTINI BARBARA alessandra.campanelli CAMPANELLI ALESSANDRA lucia.bongiorni BONGIORNI LUCIA nicoletta.ademollo ADEMOLLO NICOLETTA annamaria.zoppini ZOPPINI ANNAMARIA TA.P04.032.002 Ruolo delle comunita microbiche nei cicli biogeochimici e nella degradazione degli inquinanti DTA.AD002.479.001 Gestione sostenibile ed efficiente delle risorse naturali, degli ecosistemi e della biodiversita |
