Management of urban, industrial and agricultural pollution to control coastal eutrophication

Malmgren-Hansen, A.; Warren, Ross

doi:10.1016/b978-0-444-89990-3.50096-1

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…K0ge Bay receives wastewater from industries and urban areas equivalent to 1.2 million Person Equivalents (PE), of which the industrial part equals 770 000 PE of the load (Malmgren-Hansen & Warren, 1992). The water exchange with the southern part of the Oresund is generally good.…”

Section: Study Areamentioning

confidence: 99%

Assessment of nutrient availability and limitation using macroalgae

Lyngby

Mortensen

1994

J Aquat Ecosyst Stress Recov

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Discs of the macroalga, Ulva lactuca L., were transplanted around an ocean outfall and at a reference site in KCge Bay, Denmark, to assess the influence of the outfall on the nutrient availability, At 2-wk intervals, samples were collected and analyzed for growth, nitrogen, and phosphorus content.The tissue concentrations of nitrogen and phosphorus decreased with distance to the outfall, showing that the tissue concentrations are suitable for monitoring nutrient availability in coastal areas and provide a time-integrated measure of the nutrient availability. The lowest tissue concentrations of nitrogen were recorded at the reference station, where the internal concentrations generally were below the critical concentration level, showing that nitrogen limited the growth. At the station located close to the outfall, the flux of nitrogen was sufficient to maintain the maximum growth rate. The tissue concentrations of phosphorus were only below the critical concentration level on one occasion, and the result showed a net uptake throughout the study period.It was concluded that in the Kcge Bay, nitrogen was the main limiting factor for macroalgae growth during the summer. The applicability of tissue concentrations for assessment of nutrient availability is discussed and it is considered that the method, when evaluated against established critical concentrations, provides a valuable tool for assessing ecosystem health with regard to eutrophication.

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Section: Study Areamentioning

confidence: 99%

Assessment of nutrient availability and limitation using macroalgae

Lyngby

Mortensen

1994

J Aquat Ecosyst Stress Recov

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Harris

1997

Hydrobiologia

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Predictive models in spatially and temporally variable freshwater systems

Harris

1998

Australian Journal of Ecology

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This paper discusses the relationships between scaling and predictability in ecosystems. The logical basis of ecosystem modelling is explored using ideas first developed in complexity theory and analogies with the behaviour of complex adaptive systems. Any ecological model is a scale‐dependent entity and both empirical and dynamic models of freshwater systems have their strengths and weaknesses. The logical basis of modelling using functional groups is explored. I conclude that such an approach can be justified and that such models have predictive power. Any predictive model of freshwater systems must take the major scales of external (atmospheric and catchment) forcing into account as well as the scales of key processes in the ecosystem itself. The importance of so‐called ‘pink noise’ spectra, which arise both from external forcing and the internal dynamics of dynamic systems, is noted. The key scales of pattern and process in freshwater ecosystems are discussed in relation to the properties of the major functional groups. In order to have predictive power, I conclude that models of freshwater systems must include sediment exchanges and the properties of aquatic macrophytes as well as water column interactions and the pelagic components. When viewed at the scale of functional groups and the major biogeochemical processes, freshwater ecosystems may not be as complex as is often assumed.

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Management of urban, industrial and agricultural pollution to control coastal eutrophication

Cited by 3 publications

References 2 publications

Assessment of nutrient availability and limitation using macroalgae

Assessment of nutrient availability and limitation using macroalgae

Untitled

Predictive models in spatially and temporally variable freshwater systems

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