Oct 12, 2013

Temperature affects leaf litter decomposition in low-order forest streams: field and microcosm approaches

FEMS Microbiology Ecology
Aingeru MartínezJesús Pozo

Abstract

Despite predicted global warming, the temperature effects on headwater stream functioning are poorly understood. We studied these effects on microbial-mediated leaf decomposition and the performance of associated aquatic hyphomycete assemblages. Alder leaves were incubated in three streams differing in winter water temperature. Simultaneously, in laboratory, leaf discs conditioned in these streams were incubated at 5, 10 and 15 °C. We determined mass loss, leaf N and sporulation rate and diversity of aquatic hyphomycete communities. In the field, decomposition rate correlated positively with temperature. Decomposition rate and leaf N presented a positive trend with dissolved nutrients, suggesting that temperature was not the only factor determining the process velocity. Under controlled conditions, it was confirmed that decomposition rate and leaf N were positively correlated with temperature, leaves from the coldest stream responding most clearly. Sporulation rate correlated positively with temperature after 9 days of incubation, but negatively after 18 and 27 days. Temperature rise affected negatively the sporulating fungi richness and diversity only in the material from the coldest stream. Our results suggest that temperatur...Continue Reading

  • References14
  • Citations7

References

Mentioned in this Paper

Sporulation
Filamentous fungus
Allergy Testing Alder
Streams
Microbial
Fungi
Hyphomycetes
Alder antigen
Plant Leaves
Alder plant

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