Effects of bioirrigation on the spatial and temporal dynamics of oxygen above the sediment-water interface
| Autor: | Andreas Lorke, Erni Murniati, Kasper Hancke, D. Gross, H. Herlina |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Biogeochemical cycle
010504 meteorology & atmospheric sciences Oxygen flux Soil science 010501 environmental sciences Aquatic Science 01 natural sciences Sediment–water interface Oxygen-sensitive nanobeads Diffusive boundary layer Laser-induced fluorescence Chironomus plumosus Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Ecology biology Bioirrigation Sediment biology.organism_classification Burrow Benthic zone Sediment-water interface Environmental science Bioturbation |
| Zdroj: | Murniati, E, Gross, D, Herlina, H, Hancke, K & Lorke, A 2017, ' Effects of bioirrigation on the spatial and temporal dynamics of oxygen above the sediment-water interface ', Freshwater Science, vol. 36, no. 4, pp. 784-795 . https://doi.org/10.1086/694854 |
| DOI: | 10.1086/694854 |
| Popis: | Burrow ventilation by tube-dwelling benthic animals affects solute exchange between sediments and water by 2 means. Drawing of O2-rich water into the burrow increases O2 availability in the sediment and stimulates biogeochemical and microbial processes, whereas flushing of the burrow creates a 3-dimensional flow field above the burrow, which induces mixing. Previous studies have revealed the role of the diffusive boundary layer (DBL) thickness on the exchange of solutes between the sediment and overlying water. Mapping the O2 gradient within the DBL is a challenging task in the presence of benthic faunal activities. We used a novel lifetime-based laser induced fluorescence (τLIF) technique that enables unobstructed observations of spatial and temporal O2 dynamics above burrows inhabited by midge larvae (Chironomus plumosus). We observed instantaneous plumes of O2-depleted water released from the outlet of the burrows and drawdown of O2-rich water above the inlet caused by peristaltic pumping of C. plumosus larvae. Vertical O2 gradients changed dynamically during burrow ventilation relative to in a control tank without animals. The advective transport of O2 above the opening caused by burrow ventilation degraded the O2-concentration gradient. For a range of larvae densities that is frequently observed in ponds and lakes, the advective transport caused by burrow ventilation was the dominant transport mechanism. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|