Iron and sulfate reduction structure microbial communities in (sub-)Antarctic sediments

Permanently cold marine sediments are heavily influenced by increased input of iron as a result of accelerated glacial melt, weathering, and erosion. The impact of such environmental changes on microbial communities in coastal sediments is poorly understood. We investigated geochemical parameters th...

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Autores principales: Wunder, Lea C., Aromokeye, David A., Yin, Xiuran, Richter-Heitmann, Tim, Willis Poratti, Graciana, Schnakenberg, Annika, Otersen, Carolin, Dohrmann, Ingrid, Römer, Miriam, Bohrmann, Gerhard, Kasten, Sabine, Friedrich, Michael W.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Ciencias Exactas
Biología
Biogeochemistry
Microbial ecology
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/141956
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-141956
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Biología
Biogeochemistry
Microbial ecology
spellingShingle Ciencias Exactas
Biología
Biogeochemistry
Microbial ecology
Wunder, Lea C.
Aromokeye, David A.
Yin, Xiuran
Richter-Heitmann, Tim
Willis Poratti, Graciana
Schnakenberg, Annika
Otersen, Carolin
Dohrmann, Ingrid
Römer, Miriam
Bohrmann, Gerhard
Kasten, Sabine
Friedrich, Michael W.
Iron and sulfate reduction structure microbial communities in (sub-)Antarctic sediments
topic_facet Ciencias Exactas
Biología
Biogeochemistry
Microbial ecology
description Permanently cold marine sediments are heavily influenced by increased input of iron as a result of accelerated glacial melt, weathering, and erosion. The impact of such environmental changes on microbial communities in coastal sediments is poorly understood. We investigated geochemical parameters that shape microbial community compositions in anoxic surface sediments of four geochemically differing sites (Annenkov Trough, Church Trough, Cumberland Bay, Drygalski Trough) around South Georgia, Southern Ocean. Sulfate reduction prevails in Church Trough and iron reduction at the other sites, correlating with differing local microbial communities. Within the order <i>Desulfuromonadales</i>, the family Sva1033, not previously recognized for being capable of dissimilatory iron reduction, was detected at rather high relative abundances (up to 5%) while other members of <i>Desulfuromonadales</i> were less abundant (<0.6%). We propose that Sva1033 is capable of performing dissimilatory iron reduction in sediment incubations based on RNA stable isotope probing. Sulfate reducers, who maintain a high relative abundance of up to 30% of bacterial 16S rRNA genes at the iron reduction sites, were also active during iron reduction in the incubations. Thus, concurrent sulfate reduction is possibly masked by cryptic sulfur cycling, i.e., reoxidation or precipitation of produced sulfide at a small or undetectable pool size. Our results show the importance of iron and sulfate reduction, indicated by ferrous iron and sulfide, as processes that shape microbial communities and provide evidence for one of Sva1033’s metabolic capabilities in permanently cold marine sediments.
format Articulo
Articulo
author Wunder, Lea C.
Aromokeye, David A.
Yin, Xiuran
Richter-Heitmann, Tim
Willis Poratti, Graciana
Schnakenberg, Annika
Otersen, Carolin
Dohrmann, Ingrid
Römer, Miriam
Bohrmann, Gerhard
Kasten, Sabine
Friedrich, Michael W.
author_facet Wunder, Lea C.
Aromokeye, David A.
Yin, Xiuran
Richter-Heitmann, Tim
Willis Poratti, Graciana
Schnakenberg, Annika
Otersen, Carolin
Dohrmann, Ingrid
Römer, Miriam
Bohrmann, Gerhard
Kasten, Sabine
Friedrich, Michael W.
author_sort Wunder, Lea C.
title Iron and sulfate reduction structure microbial communities in (sub-)Antarctic sediments
title_short Iron and sulfate reduction structure microbial communities in (sub-)Antarctic sediments
title_full Iron and sulfate reduction structure microbial communities in (sub-)Antarctic sediments
title_fullStr Iron and sulfate reduction structure microbial communities in (sub-)Antarctic sediments
title_full_unstemmed Iron and sulfate reduction structure microbial communities in (sub-)Antarctic sediments
title_sort iron and sulfate reduction structure microbial communities in (sub-)antarctic sediments
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/141956
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