Nutrient cycling and ecosystem behaviour in a salt-water lake

Vries, I. de; Hopstaken, C.F.

doi:10.1016/0077-7579(84)90003-6

Cited by 44 publications

(16 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 and 2). Although the interstitial water often contains concentrations of inorganic nutrients orders of magnitude higher than the overlying water, the marine rnicrophytobenthos appear to be nutrient limited (mainly by N) and hence compete for nutrients in the overlying water (Henriksen et al 1980, Connor et al 1982, Blackburn & Henriksen 1983, Wonnerberger & Hopner 1984, de Vries & Hopstaken 1984, Graneli & Sundback 1985, Asmus 1986, Sundback 1986). In the Dutch Wadden Sea the microbenthic primary production has increased concomitant with the increase in nutrient loading (Cadee 1984).…”

Section: Discussionmentioning

confidence: 99%

Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Sundbäck¹,

Granéli²

1988

Mar. Ecol. Prog. Ser.

146

View full text Add to dashboard Cite

The importance of microphytobenthos as a regulator of the flux of inorganic phosphorus and nitrogen between sediment and water was investigated in a laboratory study. Sediment from the SE Kattegat was incubated in nutrient-enriched seawater during exposure to varying light quantities (0, 5, 10, and 30 pE m-' S-'). Microphytobenthos growth was limited by both inorganic nutrients and light quantity. When exposed to no-light conditions, chlorophyll a content of the sediment decreased only slightly and remained at an almost constant level (50 to 55 mg m-2) for several weeks, and increased rapidly when exposed to light. A relationship was observed between light quantity and the rate and direction of the flux of NH: and PO:-, but not NO;, between the sediment and overlying water The indirect influence of the microphytobenthos on the nutrient flux, i.e. by changes in the oxygen concentration, seemed more important than the direct effect by uptake by the algae. The rate of release of phosphate from the sediment exposed to darkness was up to 0.2 mm01 PO4 m-2 d-l The maximum mean rate of ammonia release was 1.6 mm01 m-' d-' in the dark and ca 0.1 mm01 m-2 d-' at 5 yE S-'. When the amount of light was 3 10 pE m-' S-', the microbenthic activity (oxygen production and increased nutrient requirements) prevented the release of PO4 and NH4 from the sediment.

show abstract

Section: Discussionmentioning

confidence: 99%

Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Sundbäck¹,

Granéli²

1988

Mar. Ecol. Prog. Ser.

146

View full text Add to dashboard Cite

show abstract

“…De Jong & Admiraal (1984) showed that even carbon may be a limiting factor in dense microalgal layers on tidal flats. The benthic microalgae thus depend on the nutrient pool of the overlying water and may compete with phytoplankton in shallow waters (de Vries & Hopstaken 1984, Carlton & Wetzel 1988.…”

Section: Nutrient Limitation Of Microphytobenthosmentioning

confidence: 99%

Response of a marine shallow-water sediment system to an increased load of inorganic nutrients

Nilsson¹,

Jönsson²,

Swanberg³

et al. 1991

Mar. Ecol. Prog. Ser.

111

View full text Add to dashboard Cite

An outdoor experimental system was used to investigate the effect of an increased load of inorganic nitrogen and phosphorus on the lower trophic levels of the food web of a shallow-water sandy sediment Estimates of structural changes were based on relationships between the biomass of autotrophs, heterotrophic bacteria and meiofauna and their qualitative composition. Effects on the functions of the sediment community were assessed by measuring primary and bacterial productivity and meiofaunal grazing rates using radiolabelling, as well as by measuring changes in oxygen and nutrient fluxes and carbon pools. The sediment system responded within 2 to 3 wk to the nutrient enrichment Meiofauna biomass increased, resulting in higher relative importance of oligochaetes and harpacticoid copepods Primary productivity increased faster than meiofaunal grazing, resulting in an increase of microalgal biomass by a factor of 4 Diatoms and filamentous cyanobacteria were favoured by the increased nutnent levels The stimulated photosynthetic acbvity had a negative feedback on the producing sediment layer, which was lifted off by oxygen bubbles entrapped in the mucus-rich top most layer. Stimulated growth of the filamentous green alga Enteroniorpha clathrata resulted In a biomass of ca 2 g C m-' after 4 wk, which was more than 2 times the biomass of microautotrophs living in the sediment. Bacterial productivity responded only weakly to the nutrient additions and the grazing pressure on bacteria was high during the whole 4 wk experiment. Meiofauna removed on average about 4 % of the microalgal biomass and 12 % of the bacterial biomass per day in treatments with increased nutrient levels, and about 10 % of autotrophs and 7 "/o of bacteria in treatments with ambient nutrient levels Although autotrophic organisms were more important carbon sources than bacteria for meiofauna, the impact of grazing on microautotrophs was small, whereas grazing may b e important in regulating bacterial growth. Measurements of ammonium, n~t r a t e , phosphate and silicate flux showed that shallow-water sediment with a high primary productivity in the top layer functions as a sink for inorgamc nutrients In terms of biomass, the addition of nutrients led to a dominance of meiofauna. However in terms of productivity, autotrophs predominated and thus, during the initlal phase of increasing nutnent levels, the entire sediment system was dominated by autotrophic processes.

show abstract

“…The chain of processes, nutrient uptake by phytoplankton, to formation of organic matter in algal cells, to mineralization of dead algae, to regeneration of nutrients, etc., repeats about eight times per year in Grevelingen. This implies that about 90% of the annual primary production of phytoplankton is supported by regenerated nutrients, especially NH 4 (de Vries and Hopstaken 1984;de Vries et al 1988a). …”

Section: Eutrophication Of Dutch Estuariesmentioning

confidence: 99%

Eutrophication, Water Management, and the Functioning of Dutch Estuaries and Coastal Lagoons

Nienhuis

1992

Estuaries

View full text Add to dashboard Cite

A number of major European rivers (especially the Rhine) have a prevailing influence on the nutrient cycling of most Dutch estuaries. Owing to the increased loading of the estuaries with nitrogen and phosphorus compounds, effects of eutrophication on the biological communities are most evident in the tidal Western Wadden Sea and in a nontidal brackish lagoon, Veerse Meer. Whether the relation between changed nutrient loadings and changed biomass and production of primary and secondary producers in the turbid tidal Dutch ecosystems should be considered as a causal relation is questionable. The very widespread practice of lagoon modification confuses the effects of nutrient loading.

show abstract

Nutrient cycling and ecosystem behaviour in a salt-water lake

Cited by 44 publications

References 40 publications

Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Response of a marine shallow-water sediment system to an increased load of inorganic nutrients

Eutrophication, Water Management, and the Functioning of Dutch Estuaries and Coastal Lagoons

Contact Info

Product

Resources

About