Aug 4, 2009

Microbial decomposer communities are mainly structured by trophic status in circumneutral and alkaline streams

Applied and Environmental Microbiology
Sofia DuarteJean-Yves Charcosset

Abstract

In streams, the release of nitrogen and phosphorus is reported to affect microbial communities and the ecological processes they govern. Moreover, the type of inorganic nitrogen (NO(3), NO(2), or NH(4)) may differently impact microbial communities. We aimed to identify the environmental factors that structure aquatic microbial communities and drive leaf litter decomposition along a gradient of eutrophication. We selected five circumneutral (Portuguese) and five alkaline (French) streams differing in nutrient concentrations to monitor mass loss of alder leaves, bacterial and fungal diversity by PCR-denaturing gradient gel electrophoresis, fungal biomass and reproduction, and bacterial biomass during 11 weeks of leaf immersion. The concentrations of inorganic nutrients in the stream water ranged from 5 to 300 microg liter(-1) soluble reactive phosphorus, 0.30 to 5.50 mg liter(-1) NO(3)-N, 2 to 103 microg liter(-1) NO(2)-N, and <4 to 7,100 microg liter(-1) NH(4)-N. Species richness was maximum in moderately anthropized (eutrophic) streams but decreased in the most anthropized (hypertrophic) streams. Different species assemblages were found in subsets of streams with different trophic statuses. In both geographic areas, the limitin...Continue Reading

  • References13
  • Citations19

References

  • References13
  • Citations19

Citations

Mentioned in this Paper

RNA Denaturation
Hypertrophic Cardiomyopathy
SDS-PAGE
Filamentous fungus
Hypertrophy
Phosphate Measurement
Allergy Testing Alder
Phosphorus Measurement
Streams
Soluble

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