Journal
INTERNATIONAL REVIEW OF HYDROBIOLOGY
Volume 96, Issue 3, Pages 221-234Publisher
WILEY
DOI: 10.1002/iroh.201111355
Keywords
flooding episodes; microbial biomass; enzymatic activities; litter quality; dissolved inorganic nitrogen
Categories
Funding
- Spanish CICYT [CGL2007-65549/BOS, CGL2008-05618-C02/BOS]
- Consolider-Ingenio [CSD2009-00065]
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Microbial colonization dynamics of fungi and bacteria were analyzed in an intermittent Mediterranean forested stream using two different leaf substrata (Platanus acerifolia and Populus nigra). Results showed that fungal and bacterial biomass accumulation was stimulated on both leaves due to a flooding episode that increased dissolved inorganic nitrogen (DIN) and dissolved oxygen (DO) availability in the stream water. Leaf mass loss coincided with the parallel increase in microbial biomass and extracellular enzymatic activities after the flood event. Differences in litter quality favoured bacterial biomass accumulation and beta-glucosidase and cellobiohydrolase enzymatic activities in the soft Populus species. Microbial heterotrophs colonization of submerged leaf litter and organic matter use in Mediterranean-type streams are modulated by environmental conditions, especially the hydrological variability.
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