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Influence of natural amphipod (Victoriopisa australiensis) (Chilton, 1923) population densities on benthic metabolism, nutrient fluxes, denitrification and DNRA in sub-tropical estuarine sediment

The influence of natural populations of the sub-surface deposit-feeding amphipod Victoriopisa australiensis on sediment biogeochemistry was assessed by randomly collecting 21 sediment cores in a zone of Coombabah Lake, southern Moreton Bay, Australia, where the benthic infauna was dominated by this...

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Published in:Hydrobiologia 2009-07, Vol.628 (1), p.95-109
Main Authors: Dunn, Ryan J. K, Welsh, David T, Jordan, Mark A, Teasdale, Peter R, Lemckert, Charles J
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description The influence of natural populations of the sub-surface deposit-feeding amphipod Victoriopisa australiensis on sediment biogeochemistry was assessed by randomly collecting 21 sediment cores in a zone of Coombabah Lake, southern Moreton Bay, Australia, where the benthic infauna was dominated by this species. Cores were incubated sequentially to determine sediment-water column fluxes of oxygen, dissolved inorganic carbon and inorganic N species, followed by incubations to determine rates of denitrification and dissimilatory nitrate reduction to ammonium (DNRA) using the isotope pairing technique. Finally, each core was sieved in order to determine the population and biomass of amphipods present. Whilst all measures of overall benthic metabolism (sediment oxygen demand, and effluxes of inorganic carbon and nitrogen) showed increased with amphipod density, with rates being stimulated 70-220% at the highest categorised density range of 2,500-3,500 ind m⁻², only the correlation with dissolved inorganic carbon was statistically significant. In contrast, there were no discernable trends between amphipod densities and any of the N-cycle processes with the slopes of all correlations being very close to zero. These results highlight the differences in mesocosm simulations of fauna effects, which primarily relate to shifts in rates of organic matter turnover, compared to natural sediments where fauna effects relate more to induced changes in rates of organic matter deposition. Therefore, while mesocosms represent a powerful tool to investigate the mechanisms by which fauna influences microbial metabolism in the sediment, only studies of natural sediments can determine to what extent these mechanisms function in situ.
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ispartof Hydrobiologia, 2009-07, Vol.628 (1), p.95-109
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1573-5117
language eng
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source Springer Nature
subjects Ammonium
Animal and plant ecology
Animal, plant and microbial ecology
Biogeochemistry
Biological and medical sciences
Biomedical and Life Sciences
Brackish
Carbon
Cores
Crustacea
Denitrification
Dissolved inorganic carbon
Ecology
Estuaries
Fauna
Freshwater & Marine Ecology
Fundamental and applied biological sciences. Psychology
General aspects
Hydrology
Invertebrates
Life Sciences
Marine ecology
Metabolism
Natural populations
Nitrate reduction
Organic matter
Oxygen demand
Population density
Primary Research Paper
Sediments
Synecology
Water column
Zoology
title Influence of natural amphipod (Victoriopisa australiensis) (Chilton, 1923) population densities on benthic metabolism, nutrient fluxes, denitrification and DNRA in sub-tropical estuarine sediment
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