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| Titel |
Diatoms as an indicator for tile drainage flow in a German lowland catchment |
| VerfasserIn |
Naicheng Wu, Claas Faber, Uta Ulrich, Britta Schmalz, Nicola Fohrer |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090701
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| Publikation (Nr.) |
 EGU/EGU2014-4955.pdf |
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| Zusammenfassung |
| The separation of flow components within a model simulation is of great importance for a
successful implementation of management measures. Tracers are commonly used to
identify and assess runoff-generating processes and to detect sources of stream flow
components within a target catchment. Diatoms could be an ideal tracer due to their
diverse preferences to different aquatic habitats (van Dam et al. 1994, Pfister et al.
2009).
As a part of a DFG (Deutsche Forschungsgemeinschaft) project, we collected diatom
samples of 9 sites (4 tile drainage, and 5 river sites) weekly or biweekly from March to July
2013 in a German lowland catchment (the Kielstau catchment).
First results showed that diatom species Achnanthes lanceolata, Fragilaria biceps and
Navicula ingapirca dominated in tile drainage flow with relative abundances of 22.2%, 21.5%
and 10.9%, respectively. For river sites, the most abundant species was Navicula
cryptocephala (20.5%), followed by Fragilaria biceps (12.9%), Cyclotella meneghiniana
(9.5%) and Achnanthes lanceolata (9.3%). Compared with river sites, tile drainage flow had
lower diatom density, biomass, species richness and percentage of Aquatic/Riparian diatoms
(AqRi%). However, the proportion of Riparian diatoms (RiZo%) increased at tile drainage
flow.
Indicator value method (IndVal) revealed that the two water types were characterized by
different indicator species. Fifteen taxa (e.g. Cocconeis placentula, Cyclotella meneghiniana,
Navicula cryptocephala and Fragilaria biceps) were significant indicators for river sites.
Achnanthes lanceolata, Achnanthes minutissima and Navicula ingapirca were significant
indicators for tile drainage flow.
These results highlight the suitability of diatoms as an indicator for tile drainage flow.
Spatial and temporal variations of diatom community should be considered in future
surveys.
Keywords: Diatoms, Flow components, Indicator value method, Tracer
References:
Pfister, L., J. J. McDonnell, S. Wrede, D. Hlúbiková, P. Matgen, F. Fenicia, L.
Ector, and L. Hoffmann. 2009. The rivers are alive: on the potential for diatoms as
a tracer of water source and hydrological connectivity. Hydrological Processes
23:2841-2845.
van Dam, H., A. Mertens, and J. Sinkeldam. 1994. A coded checklist and ecological
indicator values of freshwater diatoms from the Netherlands. Netherlands Journal of Aquatic
Ecology 28:117-133. |
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