Tight benthic-pelagic coupling drives seasonal and interannual changes in iron‑sulfur cycling in Arctic fjord sediments (Kongsfjorden, Svalbard)

2022 ◽  
Vol 225 ◽  
pp. 103645
Author(s):  
Lisa C. Herbert ◽  
Alexander B. Michaud ◽  
Katja Laufer-Meiser ◽  
Clara J.M. Hoppe ◽  
Qingzhi Zhu ◽  
...  
Keyword(s):  
Sulfur Cycling ◽  
Iron Sulfur ◽  
Arctic Fjord ◽  
Benthic Pelagic Coupling ◽  
Fjord Sediments

scholarly journals Relatively high antibiotic resistance among heterotrophic bacteria from arctic fjord sediments than water – Evidence towards better selection pressure in the fjord sediments

Polar Science ◽  
2015 ◽  
Vol 9 (4) ◽  
pp. 382-388 ◽  
Author(s):  
A.A. Mohamed Hatha ◽  
C.S. Neethu ◽  
S.M. Nikhil ◽  
K.M. Mujeeb Rahiman ◽  
K.P. Krishnan ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Selection Pressure ◽  
Heterotrophic Bacteria ◽  
Arctic Fjord ◽  
Fjord Sediments

scholarly journals Complex Microbial Communities Drive Iron and Sulfur Cycling in Arctic Fjord Sediments

2019 ◽  
Vol 85 (14) ◽  
Author(s):  
J. Buongiorno ◽  
L. C. Herbert ◽  
L. M. Wehrmann ◽  
A. B. Michaud ◽  
K. Laufer ◽  
...  
Keyword(s):  
Organic Matter ◽  
Primary Production ◽  
Sulfate Reduction ◽  
The Arctic ◽  
Sulfur Cycling ◽  
Glacial Retreat ◽  
Sulfate Reducing ◽  
Glacial Runoff ◽  
Sulfate Reduction Rates ◽  
Fjord Sediments

ABSTRACTGlacial retreat is changing biogeochemical cycling in the Arctic, where glacial runoff contributes iron for oceanic shelf primary production. We hypothesize that in Svalbard fjords, microbes catalyze intense iron and sulfur cycling in low-organic-matter sediments. This is because low organic matter limits sulfide generation, allowing iron mobility to the water column instead of precipitation as iron monosulfides. In this study, we tested this with high-depth-resolution 16S rRNA gene libraries in the upper 20 cm at two sites in Van Keulenfjorden, Svalbard. At the site closer to the glaciers, iron-reducingDesulfuromonadales, iron-oxidizingGallionellaandMariprofundus, and sulfur-oxidizingThiotrichalesandEpsilonproteobacteriawere abundant above a 12-cm depth. Below this depth, the relative abundances of sequences for sulfate-reducingDesulfobacteraceaeandDesulfobulbaceaeincreased. At the outer station, the switch from iron-cycling clades to sulfate reducers occurred at shallower depths (∼5 cm), corresponding to higher sulfate reduction rates. Relatively labile organic matter (shown by δ13C and C/N ratios) was more abundant at this outer site, and ordination analysis suggested that this affected microbial community structure in surface sediments. Network analysis revealed more correlations between predicted iron- and sulfur-cycling taxa and with uncultured clades proximal to the glacier. Together, these results suggest that complex microbial communities catalyze redox cycling of iron and sulfur, especially closer to the glacier, where sulfate reduction is limited due to low availability of organic matter. Diminished sulfate reduction in upper sediments enables iron to flux into the overlying water, where it may be transported to the shelf.IMPORTANCEGlacial runoff is a key source of iron for primary production in the Arctic. In the fjords of the Svalbard archipelago, glacial retreat is predicted to stimulate phytoplankton blooms that were previously restricted to outer margins. Decreased sediment delivery and enhanced primary production have been hypothesized to alter sediment biogeochemistry, wherein any free reduced iron that could potentially be delivered to the shelf will instead become buried with sulfide generated through microbial sulfate reduction. We support this hypothesis with sequencing data that showed increases in the relative abundance of sulfate reducing taxa and sulfate reduction rates with increasing distance from the glaciers in Van Keulenfjorden, Svalbard. Community structure was driven by organic geochemistry, suggesting that enhanced input of organic material will stimulate sulfate reduction in interior fjord sediments as glaciers continue to recede.

scholarly journals Glacial controls on redox-sensitive trace element cycling in Arctic fjord sediments (Spitsbergen, Svalbard)

2020 ◽  
Vol 271 ◽  
pp. 33-60 ◽  
Author(s):  
Lisa C. Herbert ◽  
Natascha Riedinger ◽  
Alexander B. Michaud ◽  
Katja Laufer ◽  
Hans Røy ◽  
...  
Keyword(s):  
Trace Element ◽  
Element Cycling ◽  
Arctic Fjord ◽  
Fjord Sediments

scholarly journals Direct determination of nitrogen cycling rates and pathways in Arctic fjord sediments (Svalbard, Norway)

2010 ◽  
Vol 55 (2) ◽  
pp. 740-752 ◽  
Author(s):  
Thomas M. Gihring ◽  
Gaute Lavik ◽  
Marcel M. M. Kuypers ◽  
Joel E. Kostka
Keyword(s):  
Nitrogen Cycling ◽  
Direct Determination ◽  
Arctic Fjord ◽  
Fjord Sediments

Iron-controlled oxidative sulfur cycling recorded in the distribution and isotopic composition of sulfur species in glacially influenced fjord sediments of west Svalbard

2017 ◽  
Vol 466 ◽  
pp. 678-695 ◽  
Author(s):  
Laura M. Wehrmann ◽  
Natascha Riedinger ◽  
Benjamin Brunner ◽  
Alexey Kamyshny ◽  
Casey R.J. Hubert ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Sulfur Cycling ◽  
Sulfur Species ◽  
Fjord Sediments

Glacial influence on the iron and sulfur cycles in Arctic fjord sediments (Svalbard)

2020 ◽  
Vol 280 ◽  
pp. 423-440 ◽  
Author(s):  
Alexander B. Michaud ◽  
Katja Laufer ◽  
Alyssa Findlay ◽  
André Pellerin ◽  
Gilad Antler ◽  
...  
Keyword(s):  
Arctic Fjord ◽  
Fjord Sediments

Contamination of arctic Fjord sediments by Pb–Zn mining at Maarmorilik in central West Greenland

2010 ◽  
Vol 60 (7) ◽  
pp. 1065-1073 ◽  
Author(s):  
K. Perner ◽  
Th. Leipe ◽  
O. Dellwig ◽  
A. Kuijpers ◽  
N. Mikkelsen ◽  
...  
Keyword(s):  
West Greenland ◽  
Arctic Fjord ◽  
Fjord Sediments

scholarly journals Oxygen distribution and bioirrigation in Arctic fjord sediments (Svalbard, Barents Sea)

2005 ◽  
Vol 292 ◽  
pp. 85-95 ◽  
Author(s):  
BB Jørgensen ◽  
RN Glud ◽  
O Holby
Keyword(s):  
Barents Sea ◽  
Oxygen Distribution ◽  
Arctic Fjord ◽  
Fjord Sediments

Global eddy permitting simulations of surface ocean nitrogen, iron, sulfur cycling

Chemosphere ◽  
2003 ◽  
Vol 50 (2) ◽  
pp. 223-235 ◽  
Author(s):  
Shaoping Chu ◽  
Scott Elliott ◽  
Mathew E Maltrud
Keyword(s):  
Sulfur Cycling ◽  
Surface Ocean ◽  
Iron Sulfur
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