Grösbacher, M; Spicher, C; Bayer, A; Obst, M; Karwautz, C; Pilloni, G; Wachsmann, M; Scherb, H; Griebler, C: Organic contamination versus mineral properties: competing selective forces shaping bacterial community assembly in aquifer sediments, Aquatic Microbial Ecology, 76, 243-255 (2016), doi:10.3354/ame01781 [Link]
Abstract:

Multiple factors have been shown to influ- ence the assembly of sediment microbial communities. We hypothesized that in an organically polluted aquifer, the degree of contamination controls bacterial distribution pat- terns, superimposing other selective forces such as sedi- ment and mineral properties. Groundwater and sediment samples were analyzed from distinct zones of a petroleum hydrocarbon contaminated sandy aquifer that correspond to different degrees of contamination: Zone 1, with a high concentration of dissolved contaminants (benzene, toluene, ethylbenzene, and xylenes); Zone 2, with high concentra- tions of sediment-bound polycyclic aromatic hydrocarbons (PAHs); and Zone 3, with only minor PAH contamination. Sediment analysis concentrated on 2 mineral fractions dif- fering in many sediment properties, i.e. translucent quartz (TQ) and mica. Sediment bacterial communities were ana- lyzed by DNA fingerprinting (terminal restriction fragment length polymorphism) and total cell counts. While Zone 1 exhibited highly similar communities on TQ and mica, the selective sorption of PAHs to mica revealed sediment bac- terial communities with hardly any taxonomic units shared in Zone 2. Typical selective forces active in sediments of oligotrophic habitats, such as sediment mineral content and surface roughness, only gained influence in Zone 3. Similarly, the least contamination revealed the most pro- nounced differences in Shannon diversity, evenness, and total cell counts between the mineral fractions tested, with mica characterized by highest biomass and bacterial diver- sity. The role of contamination as a selective force is also underlined by the zone-specific dominance of key microbes involved in petroleum hydrocarbon degradation. Our re- sults demonstrate that typical selective forces shaping aquifer sediment microbial communities are outcompeted by organic contamination.

Aktuelle Termine

Fr. 10.07.2020 aktuell
12th BayCEER Workshop 2020: "Call for Abstracts" geöffnet
BayCEER-Kolloquium:
Do. 22.10.2020
Extreme redox oscillations in freshwater re-flooded acid sulfate soil wetlands: Effects on Fe, S, and trace metals geochemical behavior
Do. 29.10.2020
Dissolved organic matter quality in differently managed forest ecosystems
Do. 05.11.2020
Signaling of rhizosphere microbiome: key for plant health, development and nutrition
Workshop:
Do. 29.10.2020
Neuer Termin: BayCEER Workshop 2020
BayCEER Blog
13.01.2020
Why Science Communication?
24.05.2019
Stoichiometric controls of C and N cycling
07.05.2019
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
16.04.2019
Picky carnivorous plants?
RSS Blog als RSS Feed
Wetter Versuchsflächen
Luftdruck (356m): 978.5 hPa
Lufttemperatur: 11.8 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 1.7 km/h
Wind (Max.): 2.9 km/h
Windrichtung: SW

...mehr
Globalstrahlung: 44 W/m²
Lufttemperatur: 14.0 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 0.0 km/h

...mehr
Diese Webseite verwendet Cookies. weitere Informationen