Biogeochemical indicators as tools for assessing sediment quality/vulnerability in transitional aquatic ecosystems
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Author(s)
Viaroli, P
Bartoli, M
Giordani, G
Magni, P
Welsh, DT
Bartoli, M
Giordani, G
Magni, P
Welsh, DT
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Dr Philip J. Boon & Dr John M. Baxter
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2004
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Abstract
- We review the major variables that can be used to monitor sediment characteristics and benthic processes in transitional water bodies with respect to ecological significance, cost/time demands, method consensus, and uncertainty of the current techniques. 2. Most of the state variables, namely organic matter, total nitrogen and phosphorus contents, are easily determined at low monetary/time cost using standardized techniques. However, they are not sufficiently informative to be used as individual-specific indicators. 3. The speciation analysis of nitrogen, phosphorus, iron and reduced sulphur provides much more precise information on the sedimentary buffering capacity. However, analytical techniques are cost/time expensive and often present some critical step, which biases their generalized application. 4. A good understanding of sedimentary processes can also be achieved by measuring benthic fluxes and process rates, but analytical techniques are too expensive to be applied in conventional monitoring programmes. 5. A tentative integrated index, based on a few low-cost simple measures of sediment characteristics (granulometry, organic matter, carbonates, reactive iron and acid volatile sulphides) is proposed, which, in parallel with the water retention time, could provide a rapid assessment of sediment vulnerability status.
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Aquatic Conservation: Marine and Freshwater Ecosystems
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14
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Environmental sciences
Biological sciences
Agricultural, veterinary and food sciences