10.3389/fmicb.2018.02926.s006
Juanjo Rodríguez
Juanjo
Rodríguez
Christine M. J. Gallampois
Christine
M. J. Gallampois
Sari Timonen
Sari
Timonen
Agneta Andersson
Agneta
Andersson
Hanna Sinkko
Hanna
Sinkko
Peter Haglund
Peter
Haglund
Åsa M. M. Berglund
Åsa
M. M. Berglund
Matyas Ripszam
Matyas
Ripszam
Daniela Figueroa
Daniela
Figueroa
Mats Tysklind
Mats
Tysklind
Owen Rowe
Owen
Rowe
Image_6_Effects of Organic Pollutants on Bacterial Communities Under Future Climate Change Scenarios.JPEG
Frontiers
2018
bacterial community composition
organic pollutants
dissolved organic matter
climate change
Baltic Sea
metagenomics
2018-11-30 04:34:16
Figure
https://frontiersin.figshare.com/articles/figure/Image_6_Effects_of_Organic_Pollutants_on_Bacterial_Communities_Under_Future_Climate_Change_Scenarios_JPEG/7404632
<p>Coastal ecosystems are highly dynamic and can be strongly influenced by climate change, anthropogenic activities (e.g., pollution), and a combination of the two pressures. As a result of climate change, the northern hemisphere is predicted to undergo an increased precipitation regime, leading in turn to higher terrestrial runoff and increased river inflow. This increased runoff will transfer terrestrial dissolved organic matter (tDOM) and anthropogenic contaminants to coastal waters. Such changes can directly influence the resident biology, particularly at the base of the food web, and can influence the partitioning of contaminants and thus their potential impact on the food web. Bacteria have been shown to respond to high tDOM concentration and organic pollutants loads, and could represent the entry of some pollutants into coastal food webs. We carried out a mesocosm experiment to determine the effects of: (1) increased tDOM concentration, (2) organic pollutant exposure, and (3) the combined effect of these two factors, on pelagic bacterial communities. This study showed significant responses in bacterial community composition under the three environmental perturbations tested. The addition of tDOM increased bacterial activity and diversity, while the addition of organic pollutants led to an overall reduction of these parameters, particularly under concurrent elevated tDOM concentration. Furthermore, we identified 33 bacterial taxa contributing to the significant differences observed in community composition, as well as 35 bacterial taxa which responded differently to extended exposure to organic pollutants. These findings point to the potential impact of organic pollutants under future climate change conditions on the basal coastal ecosystem, as well as to the potential utility of natural bacterial communities as efficient indicators of environmental disturbance.</p>