Denitrification in a large river: consideration of geomorphic controls on microbial activity and community structure

Ecology
Corianne TatariwJennifer W Edmonds

Abstract

Ecological theory argues that the controls over ecosystem processes are structured hierarchically, with broader-scale drivers acting as constraints over the interactions and dynamics at nested levels of organization. In river ecosystems, these interactions may arise from broadscale variation in channel form that directly shapes benthic habitat structure and indirectly constrains resource supply and biological activity within individual reaches. To evaluate these interactions, we identified sediment characteristics, water chemistry, and denitrifier community structure as factors influencing benthic denitrification rates in a sixth-order river that flows through two physiographic provinces and the transitional zone between them, each with distinct geomorphological properties. We found that denitrification rates tracked spatial changes in sediment characteristics and varied seasonally with expected trends in stream primary production. Highest rates were observed during the spring and summer seasons in the physiographic province dominated by fine-grained sediments, illustrating how large-scale changes in river structure can constrain the location of denitrification hotspots. In addition, nirS and nirK community structure each respo...Continue Reading

References

Apr 2, 1999·Applied and Environmental Microbiology·S Hallin, P E Lindgren
Mar 8, 2000·Microbiology and Molecular Biology Reviews : MMBR·X PerretW J Broughton
Jun 1, 1986·Applied and Environmental Microbiology·P B Christensen, J Sørensen
Feb 1, 2007·Microbial Ecology·Sarah E InwoodMelody J Bernot
Feb 20, 2007·Microbial Ecology·Melissa A Rubin, Laura G Leff
Oct 17, 2007·FEMS Microbiology Ecology·Heather E Reed, Jennifer B H Martiny
Mar 14, 2008·Nature·Patrick J MulhollandSuzanne M Thomas
May 24, 2008·Science·Paul G FalkowskiEdward F Delong
Mar 28, 2009·Ecology·Michael S StricklandMark A Bradford
Jul 17, 2009·Environmental Science & Technology·Charles W KnappDavid W Graham
Jan 6, 2010·Journal of Environmental Quality·Sara K McMillanHans W Paerl
Feb 2, 2010·Applied and Environmental Microbiology·Karin EnwallSara Hallin
Sep 20, 2011·Applied and Environmental Microbiology·Jennifer J Mosher, Robert H Findlay
May 26, 2012·Environmental Microbiology·Maria C PortilloNoah Fierer
Jul 7, 2012·Ecology·G Darrel Jenerette, Amitava Chatterjee

❮ Previous
Next ❯

Citations

Mar 11, 2015·PloS One·Jatta SaarenheimoMarja Tiirola
Sep 23, 2014·The ISME Journal·Daniel S ReadRobert I Griffiths

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.