Importance of advective mass transfer and sediment surface area for streambed microbial communities
| Autor: | Clara Mendoza-Lera, Laura L. Federlein, Matthias Knie, Aline Frossard, Michael Mutz, Mark O. Gessner |
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| Rok vydání: | 2016 |
| Předmět: |
010504 meteorology & atmospheric sciences
Ecology 0208 environmental biotechnology Sorting (sediment) Sediment Soil science 02 engineering and technology STREAMS Aquatic Science 01 natural sciences Grain size 020801 environmental engineering Flume Hydraulic conductivity Microbial population biology Mass transfer Environmental science 0105 earth and related environmental sciences |
| Zdroj: | Freshwater Biology. 62:133-145 |
| ISSN: | 0046-5070 |
| Popis: | Summary Variability of flow and shear stress cause local sorting and a patchy distribution of grain size in streambed sediments. Sediment microbial communities can be affected by the resulting heterogeneity because grain size determines (i) the sediment surface area available for microbial colonisation and (ii) the hydraulic conductivity and hence advective mass transfer of solutes and redox partners. However, the relative influence of the two factors on sediment microbial communities is not clear. We performed an experiment in 12 indoor flumes with three types of sediment: gravel (2–8 mm), a sand–gravel mixture (25 and 75% by mass) and sand (0.2–0.8 mm) in four flumes each. The sediments differed in both advective mass transfer (gravel > sand–gravel mixture = sand) and surface area (gravel |
| Databáze: | OpenAIRE |
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