Variation of nonlocal irrigation in a subtidal benthic community
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ID: 302729
2003
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Abstract
Irrigation, the effect of the pumping activity by benthic infauna on pore water solute distribution and fluxes, may be represented by a nonlocal irrigation function, a (units: 1/time) in the general diagenetic equation. We derived a from the distribution of a solute tracer, bromide, during laboratory incubations of sediment cores containing their natural faunal community. Sediments were sampled on 4 occasions over a period of one year from a site at 30 m depth in the southern North Sea. Fitting an irrigation function exponentially decaying with depth, we arrived at α-values ranging from 25 to >200 yr -1 at the sediment water interface and a < 10 at 16 cm depth. The importance of meaningful horizontal averaging was shown by contrasting our values with unreasonable high a based on inappropriate sampling. Variability of a between adjacent samples (n = 3-6) was as large as seasonal differences, and this fact underlines the necessity for cautious interpretation of data from single cores. No temperature effect on a was observed in the temperature range of 5-16°C since abundance of fauna and their behavior completely dominated the magnitude of a. Nutrient fluxes associated with this nonlocal irrigation are highly variable on a spatial scale reflecting macrofauna heterogeneity. The irrigation flux reduces the relative importance of temperature as a factor on benthic-pelagic solute fluxes.
| Reference Key |
openalex_W2069463367
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|---|---|
| Authors | Stefan Förster, Arzhang Khalili, Jarmila Kitlar |
| Journal | journal of marine research |
| Year | 2003 |
| DOI |
10.1357/002224003322201223
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| URL | |
| Keywords | Keywords not found |
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