scholarly journals Archaea Dominate the Ammonia-Oxidizing Community in the Rhizosphere of the Freshwater Macrophyte Littorella uniflora

2008 ◽  
Vol 74 (10) ◽  
pp. 3279-3283 ◽  
Author(s):  
Martina Herrmann ◽  
Aaron M. Saunders ◽  
Andreas Schramm
Keyword(s):  
Freshwater Sediment ◽  
Ammonia Monooxygenase ◽  
Nitrification Activity ◽  
Submersed Macrophyte ◽  
Littorella Uniflora ◽  
Relative Abundances ◽  
Freshwater Macrophyte

ABSTRACT Archaeal and bacterial ammonia monooxygenase genes (amoA) had similar low relative abundances in freshwater sediment. In the rhizosphere of the submersed macrophyte Littorella uniflora, archaeal amoA was 500- to >8,000-fold enriched compared to bacterial amoA, suggesting that the enhanced nitrification activity observed in the rhizosphere was due to ammonia-oxidizing Archaea.

Fate of N,N-Bis-(2,4,6-Trichlorophenyl)-Urea in a Freshwater Sediment

1990 ◽  
Author(s):  
Scott D. Harvey ◽  
Dennis D. Dauble ◽  
Bruce D. McVeety ◽  
Robert J. Fellows ◽  
Roger M. Beam
Keyword(s):  
Freshwater Sediment

The Influence of Benthic Biota on Copper Speciation and Distribution in Freshwater-Sediment Systems

1981 ◽  
Vol 16 (1) ◽  
pp. 45-58 ◽  
Author(s):  
G. Krantzberg ◽  
P.M. Stokes
Keyword(s):  
Freshwater Sediment ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Copper Species ◽  
Copper Speciation ◽  
Physico Chemical ◽  
Macro Benthos

Abstract An investigation was made of the effects exerted by benthic macroinvertebrate communities on copper speciation in sediments from a lake which is becoming acidified. In laboratory microcosms, benthic macroinvertebrate communities stimulated the flux of copper from sediment to water. The presence of the macro-benthos resulted in a redistribution of physico-chemical copper species within the sediment with a transfer from more strongly complexed forms (HC1 extractable) to adsorbed and cation exchangeable forms (MgCl2 extractable). The role of bio-turbation in copper transformations is discussed.

UNDERSTANDING THE ROLE OF MICROBES IN THE FRESHWATER SEDIMENT CRYPTIC SULFUR CYCLE USING METAGENOMICS AND METATRANSCRIPTOMICS

2020 ◽  
Author(s):  
Emily Hyde ◽  
◽  
Cody Sheik ◽  
Sergei Katsev ◽  
Madelyn Petersen ◽  
...  
Keyword(s):  
Sulfur Cycle ◽  
Freshwater Sediment

Chironomus sancticaroli generation test applied to chemical contaminants and freshwater sediment samples

2021 ◽  
Author(s):  
Mayara Caroline Felipe ◽  
Aline Christine Bernegossi ◽  
Bruna Nayara Cardoso-Silva ◽  
Marcelo Marques Dell’Acqua ◽  
Juliano José Corbi
Keyword(s):  
Freshwater Sediment ◽  
Chemical Contaminants ◽  
Sediment Samples ◽  
Generation Test

scholarly journals Effects of long-acting, broad spectra anthelmintic treatments on the rumen microbial community compositions of grazing sheep

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Christina D. Moon ◽  
Luis Carvalho ◽  
Michelle R. Kirk ◽  
Alan F. McCulloch ◽  
Sandra Kittelmann ◽  
...  
Keyword(s):  
Archaeal Community ◽  
Fungal Communities ◽  
Control Group ◽  
Microbiota Composition ◽  
Rumen Microbiota ◽  
Treatment Groups ◽  
Methanobrevibacter Ruminantium ◽  
Group 12 ◽  
Relative Abundances ◽  
Long Acting

AbstractAnthelmintic treatment of adult ewes is widely practiced to remove parasite burdens in the expectation of increased ruminant productivity. However, the broad activity spectra of many anthelmintic compounds raises the possibility of impacts on the rumen microbiota. To investigate this, 300 grazing ewes were allocated to treatment groups that included a 100-day controlled release capsule (CRC) containing albendazole and abamectin, a long-acting moxidectin injection (LAI), and a non-treated control group (CON). Rumen bacterial, archaeal and protozoal communities at day 0 were analysed to identify 36 sheep per treatment with similar starting compositions. Microbiota profiles, including those for the rumen fungi, were then generated for the selected sheep at days 0, 35 and 77. The CRC treatment significantly impacted the archaeal community, and was associated with increased relative abundances of Methanobrevibacter ruminantium, Methanosphaera sp. ISO3-F5, and Methanomassiliicoccaceae Group 12 sp. ISO4-H5 compared to the control group. In contrast, the LAI treatment increased the relative abundances of members of the Veillonellaceae and resulted in minor changes to the bacterial and fungal communities by day 77. Overall, the anthelmintic treatments resulted in few, but highly significant, changes to the rumen microbiota composition.

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