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The Phosphorus Cycle01:21

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Microbial Community Structure and Function Decoupling Across a Phosphorus Gradient in Streams.

Erick S LeBrun1, Ryan S King1, Jeffrey A Back1

  • 1Department of Biology, Center for Reservoir and Aquatic Systems Research, Baylor University, One Bear Place 97388, Waco, TX, 76798-7388, USA.

Microbial Ecology
|July 20, 2017
PubMed
Summary
This summary is machine-generated.

Microbial communities in freshwater streams are influenced by phosphorus levels, with turbidity also playing a significant role. Changes in phosphorus concentrations reveal distinct shifts in bacterial and archaeal populations.

Keywords:
Community functionFreshwaterMiSeqMicrobial communitiesPhosphorusTurbidity

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Area of Science:

  • Environmental Science
  • Microbiology
  • Ecology

Background:

  • Phosphorus (P) is vital for ecosystems, and human inputs significantly impact freshwater systems.
  • The role and composition of microbial communities in the phosphorus cycle are not fully understood.

Purpose of the Study:

  • Investigate the relationship between phosphorus levels and microbial communities (bacteria and archaea) in freshwater streams.
  • Analyze the structure and function of these communities using 16S rRNA gene sequencing and predicted functional metagenomes.

Main Methods:

  • Collected samples from 25 streams along a phosphorus gradient.
  • Employed 16S ribosomal RNA (rRNA) gene sequencing for community structure analysis.
  • Utilized computationally predicted functional metagenomes (PFMs) to assess functional capabilities.

Main Results:

  • Observed a decoupling between microbial community structure and function.
  • Found correlations between total phosphorus (TP) and community structure/function, but turbidity showed a stronger, independent correlation.
  • Identified sharp shifts in ecologically important taxa abundance at approximately 55 μg/L TP.

Conclusions:

  • Both phosphorus and turbidity significantly shape freshwater microbial communities.
  • Specific phosphorus thresholds can trigger substantial changes in microbial populations, impacting ecosystem dynamics.