Phytoplankton primary production and biomass in the western Wadden Sea (The Netherlands); A comparison with an ecosystem model

Veldhuis, Mjw; Colijn, F.; Venekamp, L.A.H.; Villerius, L.

doi:10.1016/0077-7579(88)90051-8

Cited by 30 publications

(8 citation statements)

References 28 publications

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“…Based on model calculations van concluded that part of the organic phosphorus components accumulated in the sediments of the western Wadden Sea during the winter and spring are mineralized and released to the water column during the summer, and also that a part of the inorganic phosphate produced by mineralization is retained temporarily in the sediment due to adsorption to the sediment particles. Moreover, mineralization and exchange processes are probably most important in the shallow and turbid inner area of the basin (de Jonge & Postma, 1974), whereas primary production dominates near the tidal inlets (Cade, 1986;Cad6e & Hegeman, 1974, 1979Veldhuis et al, 1988). These literature data indicate that locally and on time scales less than one year the P-cycle in the Marsdiep basin is far more complicated than the annual budgets suggest.…”

Section: Discussionmentioning

confidence: 76%

The phosphorus budget of the Marsdiep tidal basin (Dutch Wadden Sea) in the period 1950–1985: importance of the exchange with the North Sea

Raaphorst

Veer

1990

Hydrobiologia

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Nutrient and carbon budgets of the western part of the Dutch Wadden Sea are based on the concept formulated by Postma (1954): import of organic compounds from the North Sea, mineralization in the estuary ans subsequently an export of dissolved inorganic nutrients to the North Sea. In this paper the phosphorus budget of the westernmost part of the Wadden Sea (Marsdiep basin) during the period 1950-1985 is considered to evaluate this concept and to investigate whether eutrophication processes have changed these P-budgets during the last decades. Most attention is paid to the importance of the exchange of P-components between the tidal basin and the open sea. The budgets are based on a general mass balance equation in which the main entries are the loadings via the freshwater sources, the net sediment-water exchange, the exchange with the North Sea, the input from the adjacent Vlie basin, and a transformation term representing the interchange between dissolved and particulate phosphorus. Averaged over the entire period 55 % of the phosphate input (SRP) to the basin is delivered by the fresh water sources, and 45% by the Vlie basin. For non-SRP components these numbers are 50% and 40% respectively, while only 10% comes from the North Sea. The import from the North Sea, as calculated by our model thus seems less important than previously documented. There is a clear effect of the eutrophication during the last decades. In the first 20 years of the period investigated there was a moderate increase in the TP input to the basin, partly caused by an increasing input of non-SRP (TP minus soluble reactive phosphorus) from the North Sea. In 1970/71 almost 30% of the non-SRP loading originated from the North Sea. From approximately 1975 onwards this import of non-SRP turns into an export, while the TP-loading from the other sources inclined, until a maximum was reached in 1981. Recently a decrease in the TP-inputs has been observed. It is concluded that the recent output of phosphorus from the Marsdiep basin may have a considerable impact on the adjacent area of the North Sea.

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Section: Discussionmentioning

confidence: 76%

The phosphorus budget of the Marsdiep tidal basin (Dutch Wadden Sea) in the period 1950–1985: importance of the exchange with the North Sea

Raaphorst

Veer

1990

Hydrobiologia

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“…Composition of the phytoplankton community in coastal, temperate waters varies seasonally, from a predominance of large, chain-forming diatoms in the wlnter and spring to dinoflagellates, protozoans and nanoplankton in the summer and early fall (Smayda 1980, Marshal1 & Cohn 1983, Marshal1 1984, Veldhuis et al 1988, Nielsen & Richardson 1989. This results in a succession from a diatom-based food chain in the winter and spring to one based on the 'microbial loop' in the summer and fall.…”

Section: Introductionmentioning

confidence: 99%

Seasonal differences in the content of Oikopleura vanhoeffeni and Calanus finmarchicus faecal pellets: illustrations of zooplankton food web shifts in coastal Newfoundland waters

Urban¹,

McKenzie²,

Deibel³

1992

Mar. Ecol. Prog. Ser.

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Faecal pellet contents from Oikopleura vanhoeffeni and Calanus finmarchicus were examined in the spring, summer, fall and winter. Contents varied seasonally, resembling available particles in the water column. This indicated a temporal succession from a diatom-based food chain in the winter and spring to one based on the microbial loop in the summer and fall. Bacteria, cyanobacteria, Anabaena sp., choanoflagellates, ciliates, and heterotrophic dinoflagellates were found in the faeces, suggesting a direct link between the microbial loop and both crustaceans and pelagic tunicates.

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“…7) was used to estimate the mean primary production for the total Marsdiep tidal basin in a specific year between 1950 and 1986. A correction factor of 0.6 based on the measurements done by Veldhuis et al (1988) and the values presented in Table 2 was used to estimate, from the above given relationship for the Marsdiep tidal channel ... .... i: i Table 3. Calculations of annual primary production for a mean m 2 based on () the relation as presented in Fig.…”

Section: Discussionmentioning

confidence: 99%

Response of the Dutch Wadden Sea ecosystem to phosphorus discharges from the River Rhine

Jonge

1990

Hydrobiologia

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Phytoplankton primary production and biomass in the western Wadden Sea (The Netherlands); A comparison with an ecosystem model

Cited by 30 publications

References 28 publications

The phosphorus budget of the Marsdiep tidal basin (Dutch Wadden Sea) in the period 1950–1985: importance of the exchange with the North Sea

The phosphorus budget of the Marsdiep tidal basin (Dutch Wadden Sea) in the period 1950–1985: importance of the exchange with the North Sea

Seasonal differences in the content of Oikopleura vanhoeffeni and Calanus finmarchicus faecal pellets: illustrations of zooplankton food web shifts in coastal Newfoundland waters

Response of the Dutch Wadden Sea ecosystem to phosphorus discharges from the River Rhine

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