Viral and grazer regulation of prokaryotic growth efficiency in temperate freshwater pelagic environments

FEMS Microbiology Ecology
A S Pradeep RamT Sime-Ngando

Abstract

In aquatic systems, limited data exists on the impact of mortality forces such as viral lysis and flagellate grazing when seeking to explain factors regulating prokaryotic metabolism. We explored the relative influence of top-down factors (viral lysis and heterotrophic nanoflagellate grazing) on prokaryotic mortality and their subsequent impact on their community metabolism in the euphotic zone of 21 temperate freshwater lakes located in the French Massif Central. Prokaryotic growth efficiency (PGE, index of prokaryotic community metabolism) determined from prokaryotic production and respiration measurements varied from 5 to 74% across the lakes. Viral and potential grazer-induced mortality of prokaryotes had contrasting impact on PGE. Potential flagellate grazing was found to enhance PGE whereas viral lysis had antagonistic impacts on PGE. The average PGE value in the grazing and viral lysis dominated lake water samples was 35.4% (±15.2%) and 17.2% (±8.1%), respectively. Selective viral lysis or flagellate grazing on prokaryotes together with the nature of contrasted substrates released through mortality processes can perhaps explain for the observed variation and differences in PGE among the studied lakes. The influences of s...Continue Reading

References

Aug 10, 1989·Nature·O BerghM Heldal
Jan 5, 1999·Applied and Environmental Microbiology·D MarieD Vaulot
Nov 5, 1999·Clinics in Laboratory Medicine·L S Garcia
Mar 10, 2004·Applied and Environmental Microbiology·Corina P D Brussaard
Apr 28, 2004·FEMS Microbiology Reviews·Markus G Weinbauer
Aug 6, 2005·Journal of Microbiological Methods·Solange Duhamel, Stéphan Jacquet
Sep 16, 2005·Nature·Curtis A Suttle
Jun 1, 1987·Applied and Environmental Microbiology·S Lee, J A Fuhrman
Jun 1, 1996·Applied and Environmental Microbiology·M MiddelboeN Kroer
Jan 16, 2007·Environmental Microbiology·T Bouvier, P A del Giorgio
Sep 15, 2007·Nature Reviews. Microbiology·Farooq Azam, Francesca Malfatti
Feb 15, 2008·The ISME Journal·Angia Sriram Pradeep Ram, Télesphore Sime-Ngando
Jun 30, 2009·Environmental Microbiology·Ruth-Anne SandaaT Frede Thingstad
Jun 1, 1993·Trends in Ecology & Evolution·T F ThingstadI Dundas

❮ 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.