Long-term nutrient enrichment of an estuarine system: Ythan, Scotland (1958–1993)

Balls, P.W.; MacDonald, Alan; Pugh, K.B.; Edwards, Anthony C.

doi:10.1016/0269-7491(95)00025-m

Cited by 56 publications

(22 citation statements)

References 18 publications

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“…Such problem mostly originates from the release of nitrogen and phosphorus compounds from point nutrient sources, such as wastewater treatment facilities, industrial effluents and agricultural non-point inputs (including land drainage and animal wastes) (Balls et al, 1995). On the basis of accumulated scientific evidence, nitrogen and phosphorus control has become increasingly important for the coastal water quality management.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Water Quality and Assessment of Land-Based Nutrient Loadings and Cycling in Kavala Gulf

Sylaïos

Stamatis

Kallianiotis

et al. 2005

Water Resour Manage

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The results of a systematic and intensive nutrient monitoring program are reported, which took place during the period 1997-1999 in Kavala Gulf, Northern Greece, having as a general task to study the impact of the various human activities on the nutrient loadings and cycling of the aquatic environment. A nutrient budget box model was used to estimate the annual capacity of Kavala Gulf to store and transform dissolved inorganic nitrogen and phosphorus, aiming at understanding the biogeochemical processes taking place in the area of interest. Point sources of nutrients from two municipal wastewater treatment plants (Kavala and Palio Seawage Treatment Works) and a phosphoric fertilizer producing industrial facility (PFP), as well as non-point sources from agricultural activities, seem responsible for the increased concentrations of dissolved inorganic nitrogen and phosphorus. Seasonal N:P-ratios suggest that nitrogen is the limiting nutrient during the summer, autumn and winter and phosphorus during the spring. The annual nutrient budget model revealed that Kavala Gulf is presently slightly autotrophic with nitrogen fixation exceeding denitrification.

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Section: Introductionmentioning

confidence: 99%

Monitoring Water Quality and Assessment of Land-Based Nutrient Loadings and Cycling in Kavala Gulf

Sylaïos

Stamatis

Kallianiotis

et al. 2005

Water Resour Manage

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“…Total N and P concentrations in the River Ythan 8 and its estuary 9 have shown an increase over recent decades, associated with changes in agricultural practice in the area. 8,10 The catchment has therefore been the subject of investigations under the EC Nitrate Directive.…”

Section: Introductionmentioning

confidence: 99%

Assessing nitrogen and phosphorus efficiency at farm and catchment scale using nutrient budgets

Domburg¹,

Edwards²,

Sinclair³

et al. 2000

J. Sci. Food Agric.

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“…In line with much of the rest of Europe, the amount of nitrogenous fertiliser applied to crops in the catchment has increased substantially and there has been a shift towards cereals and oil-seed rape (Raffaelli 1998(Raffaelli , 1999. Not surprisingly, the levels of dissolved oxidised nitrogen in the river have increased over the past 30 years and these levels are reflected in the receiving estuary (Balls et al 1995;Raffaelli 1999). Analysis of aerial photographs taken in mid-summer at low tide show that in 1954 and 1969, green macro-algal mats (only biomasses >1 kg m -2 wet weight show up on the photographs) were then much less widespread than in the 1980s and 1990s (Fig.…”

Section: Introductionmentioning

confidence: 99%

Interactions between macro-algal mats and invertebrates in the Ythan estuary, Aberdeenshire, Scotland

Raffaelli¹

2000

Helgoland Marine Research

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Blooms of opportunistic green macro-algae are a common feature of coastal areas and their effects on mudflat invertebrates can be dramatic. On the Ythan estuary, Aberdeenshire, Scotland, we have carried out a number of manipulative field experiments designed to evaluate the effects on invertebrates of different species of macro-algae with contrasting ecologies, and the effects of invertebrates on the development of the blooms. Macro-algal mats were found to have dramatic negative effects on the density of the amphipod Corophium volutator, with higher algal biomasses having greater impact. The mechanism for this interaction seems to be interference by the algal filaments with the feeding behaviour of the amphipod. In contrast, the polychaete Capitella spp. increases in abundance under macro-algal mats due to enrichment of the sediment with organic material. These two interactions are seen at all scales, in areas of less than 1 m 2 to the scale of the entire estuary, irrespective of the species composition of the macroalgal mats. Bioturbation by Corophium and grazing by the snail Hydrobia ulvae had little effect on macro-algal biomass, but there were less algae when the polychaete Nereis diversicolor was present. The most significant interaction in this system is the pronounced negative impact of algal mats on the abundance of Corophium, probably the most important invertebrate species in the diets of the estuary's shorebirds, fish and epibenthic crustaceans.

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Long-term nutrient enrichment of an estuarine system: Ythan, Scotland (1958–1993)

Cited by 56 publications

References 18 publications

Monitoring Water Quality and Assessment of Land-Based Nutrient Loadings and Cycling in Kavala Gulf

Monitoring Water Quality and Assessment of Land-Based Nutrient Loadings and Cycling in Kavala Gulf

Assessing nitrogen and phosphorus efficiency at farm and catchment scale using nutrient budgets

Interactions between macro-algal mats and invertebrates in the Ythan estuary, Aberdeenshire, Scotland

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