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Effect of the brittle star Amphiura filiformis (Amphiuridae, Echinodermata) on oxygen flux into the sediment
It is suggested that natural populations of A. filiformiscan account for 80% of the total flux of O 2 into the soft bottom, and at least 67% of this portion is due to the diffusion of O2 across additional sediment-water interfaces excavated by the brittle star.
Hypoxia and sulphide as structuring factors in a macrozoobenthic community on the Baltic Sea shore: colonisation studies and tolerance experiments
At these shallow sites in the Baltic Sea a combined set of abiotic and biotic factors seems to favour rapid recovery of a stress-preconditioned macrobenthos from recurring small-scale hypoxic and sulphidic periods which dominate the ecosystem as structuring factors.
Photosynthetic performance of benthic microbial mats in Lake Hoare, Antarctica
We measured in situ photosynthesis of benthic microbial mats at various depths in Lake Hoare, a permanently ice‐covered lake of the McMurdo Dry Valleys, Antarctica, using oxygen (O2) microelectrodes.…
Interactions between the mat‐forming alga Didymosphenia geminata and its hydrodynamic environment
Enhanced mass transfer at mat surfaces and effective solute retention in mat matrices suggest a mechanism by which D. geminata cells acquire nutrients from different sources: advection-dominated transport of water-column nutrients to cells at mat surface, and diffusion-dominated Transport from decomposing organic matter within mats, with minimal advective losses.
Modification of sediment-water solute exchange by sediment-capping materials : effects on O2 and pH
The release of phosphorus from sediments can stimulate algal blooms in eutrophic water bodies worldwide. One technique to reduce this release involves capping the sediment with millimetre-thick…
The large-scale environmental impact experiment DISCOL—reflection and foresight
Abyssal nematode assemblages in physically disturbed and adjacent sites of the eastern equatorial Pacific
Ciliate-generated advective seawater transport supplies chemoautotrophic ectosymbionts
Variations of (O2) and (H2S) in seawater surrounding laboratory-reared sessile ciliates with ectosymbiotic chemoautotrophic bacteria were studied at high spatial and temporal resolutions and it is suggested that this advective fluid transport supplies the ectobiotic bacteria with O2 and H2S simultaneously.
Flow microenvironment of two marine peritrich ciliates with ectobiotic chemoautotrophic bacteria
The measurements given here support the earlier data indicating the importance of the feeding current for the bacteria-ciliate association, i.e. the cilia beat drives H2S- and O2-containing seawater toward the zooid at high veloc- ity and thus, supports the growth of the ectobiotic sulfide-oxidizing bacteria.
Deposition of terrigenous sediment on subtidal marine macrobenthos: response of two contrasting community types
- A. Lohrer, S. Thrush, C. Lundquist, K. Vopel, J. Hewitt, P. E. Nicholls
- Environmental Science
- 24 January 2006
The diverse coarse sand community outside the harbour was more sensitive to terrigenous materials than that which lived in muddier sedi- ments inside the harbour, as indicated by multivariate and univariate analyses.