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Adaptation of soil microbial communities to temperature: comparison of fungi and bacteria in a laboratory experiment

Författare:
Publiceringsår: 2009
Språk: Engelska
Sidor: 2950-2957
Publikation/Tidskrift/Serie: Global Change Biology
Volym: 15
Nummer: 12
Dokumenttyp: Artikel
Förlag: Wiley-Blackwell Publishing, Inc

Sammanfattning

Temperature not only has direct effects on microbial activity, but can also affect activity indirectly by changing the temperature dependency of the community. This would result in communities performing better over time in response to increased temperatures. We have for the first time studied the effect of soil temperature (5-50 degrees C) on the community adaptation of both bacterial (leucine incorporation) and fungal growth (acetate-in-ergosterol incorporation). Growth at different temperatures was estimated after about a month using a short-term assay to avoid confounding the effects of temperature on substrate availability. Before the experiment started, fungal and bacterial growth was optimal around 30 degrees C. Increasing soil temperature above this resulted in an increase in the optimum for bacterial growth, correlated to soil temperature, with parallel shifts in the total response curve. Below the optimum, soil temperature had only minor effects, although lower temperatures selected for communities growing better at the lowest temperature. Fungi were affected in the same way as bacteria, with large shifts in temperature tolerance at soil temperatures above that of optimum for growth. A simplified technique, only comparing growth at two contrasting temperatures, gave similar results as using a complete temperature curve, allowing for large scale measurements also in field situations with small differences in temperature.

Disputation

Nyckelord

  • Biology and Life Sciences
  • temperature
  • soil
  • fungal growth
  • bacterial growth
  • community adaptation
  • temperature response

Övrigt

Published
  • Effect of environmental factors on fungal and bacterial growth in soil
  • Microbial carbon-use efficiency
Yes
  • Microbial Ecology
  • ISSN: 1354-1013

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