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Temporal changes in a pink feedlot lagoon.

T L Wenke1, J C Vogt

  • 1Department of Biological Sciences, Fort Hays State University, Hays, Kansas 67601.

Applied and Environmental Microbiology
|February 1, 1981
PubMed
Summary

Annual fall peaks in Thiopedia rosea abundance were observed in a feedlot lagoon, linked to optimal pH and protein levels. Increased sulfate concentrations followed protein peaks, with aeration reducing bacterial growth.

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Area of Science:

  • Environmental microbiology
  • Limnology
  • Bacterial ecology

Background:

  • Feedlot drainage lagoons can harbor unique microbial communities.
  • Thiopedia rosea, a phototrophic purple sulfur bacterium, can dominate these environments.
  • Understanding temporal dynamics is crucial for lagoon management.

Purpose of the Study:

  • To investigate the seasonal variations in Thiopedia rosea populations within a feedlot lagoon.
  • To correlate bacterial abundance with key environmental parameters.
  • To assess the impact of environmental changes on lagoon chemistry and microbial composition.

Main Methods:

  • Monitoring surface protein and bacteriochlorophyll concentrations over a 3-year period as indicators of T. rosea abundance.
  • Measuring environmental parameters including pH, alkalinity, sulfide, and sulfate concentrations.
  • Observing changes in dissolved oxygen and water levels.
  • Assessing the effect of aeration on bacterial populations.

Main Results:

  • T. rosea abundance, indicated by protein and bacteriochlorophyll, peaked annually in the fall.
  • Bacteriochlorophyll concentrations correlated positively with pH, alkalinity, and protein.
  • Sulfate concentrations significantly increased in fall and winter, preceded by protein peaks.
  • Increased dissolved oxygen and aeration led to a decline in T. rosea populations.

Conclusions:

  • Thiopedia rosea exhibits distinct seasonal population dynamics in feedlot lagoons, favoring fall conditions.
  • Lagoon chemistry, particularly pH and sulfate levels, is closely linked to T. rosea abundance.
  • Changes in hydrology and oxygen levels significantly impact T. rosea populations, suggesting sensitivity to aeration.

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