Restoration of Botshol (The Netherlands) by reduction of external nutrient load: Recovery of the Characean community

Simons, J.; Ohm, Marieke; Daalder, Remco

doi:10.1007/bf02270814

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…Submerged macrophytes play a very important role in stabilising the clear-water state in shallow mesotrophic and eutrophic lakes (Perrow et al, 1997;Scheffer, 1998). Because charophytes are able to colonise lakes rapidly (Simons et al, 1994;Beltman & Allegrini, 1997;Meijer et al, 1999), they often play an important role in early stages of recovery after reduction of high anthropogenic nutrient inputs (Simons et al, 1994;Van den Berg, 1999). There is much evidence that charophytes have a particularly strong positive effect on water transparency (Crawford, 1979;Scheffer et al, 1994;Van den Berg et al, 1998;Van Donk & Van de Bund, 2003. Responses of macrophytes, phytoplankton, zooplankton and other important food-web constituents to combinations of nutrient addition and the abundance of zooplanktivorous fish were tested in in situ enclosures in a shallow lake dominated by charophytes.…”

Section: Introductionmentioning

confidence: 99%

Effects of fish and nutrient additions on food‐web stability in a charophyte‐dominated lake

Bund

Donk

2004

Freshwater Biology

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SUMMARY1. The response of major food-web constituents to combinations of nutrient addition and zooplanktivorous fish abundance was tested during two subsequent years in the shallow charophyte-dominated lake Naardermeer in the Netherlands, using in situ enclosures. 2. Treatment effects differed sharply between study years. In 1998, when the summer temperature was low (17-21°C), high algal biomass only developed at high nutrient levels in the presence of fish, but with no major effect on Chara biomass. In 1999, when the summer temperature was relatively high (20-25°C), algal blooms occurred at high nutrient levels regardless of fish abundance, and were associated with a drastic decline in Chara biomass. 3. Differences between years in temperature and initial zooplankton composition and biomass were likely to contribute to the varying relative importance of top-down and bottom-up effects in these enclosure experiments. 4. The results suggest that when nutrient loads are increased towards levels where the macrophyte-dominated state is being destabilised, a 'switch' is more likely to occur in warm summers.

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Section: Introductionmentioning

confidence: 99%

Effects of fish and nutrient additions on food‐web stability in a charophyte‐dominated lake

Bund

Donk

2004

Freshwater Biology

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“…Hosper 1997;Scheffer 1998), an increase in the phosphate concentration can lead to a rise in the phytoplankton levels and a decrease of the light penetration in the water, which is probably the primary controlling factor for the germination and growth of Charophyta (Blindow 1988;Simons et al 1992). The studies described in this article show that pumping suppletion water with a different chemical composition into a nature reserve in periods of drought can have an internal eutrophication effect.…”

Section: Methodsmentioning

confidence: 85%

“…These measures included an iron-chloride dosing plant in the supply route and the isolation from the agricultural areas by dams to prevent runoff. In 1990 the Chara communities did recover (Simons et al 1992), but after 1992 the Chara community collapsed and a undulating pattern was established of collapsing and recovering Chara communities and submerged macrophytes and P levels fluctuated below and above the threshold level of 0.02 mg P l À1 (Rip et al 1994).…”

Section: Introductionmentioning

confidence: 97%

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Effect of Different Chloride Concentrations on Nutrient Release in Wetland Soils: A Phytometer Assessment in the Botshol Wetlands, The Netherlands

Beltman

Rip²,

Bak

et al. 2005

Wetlands Ecol Manage

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Turbid water, high phosphorus (P)-loading and disappearing Chara communities forced local water authorities to carry out restoration measures in the lakes and marshes of the Botshol The Netherlands. The reduction of the external-P input could be reached by chemical treatment of the brackish suppletion water and by separating the area from nearby agricultural areas. A side effect of these measures was an increase of chloride from 400 mg l À1 to 1000 mg l À1 in the surface water of Botshol. Internal biogeochemical processes were investigated with phytometers and direct measurements of soil nutrient availability in greenhouse experiments. The increased chloride levels were assumed to increase soil pore water P. The first experiment showed higher P in the peat-soils treated with the highest Cl-concentration and an increased leaching of PO 4 from the lake-bottom peat-soils. No reaction of the phytometer Epilobium hirsutum was found. In the second experiment the 800 mg l À1 Cl-treatment resulted in significantly higher biomass of Carex acutiformis grown on treated bank soil. N-uptake by the phytometer Carex acutiformis was significantly higher. The available-P and total-P in the bank soil did not show a treatment effect. The two studies showed under similar 'standardized' conditions a treatment effect of chloride on the P-availability, resulting in higher PO 4 leaching and increased plant nutrient concentrations and biomass. The field study showed higher available-P concentrations in the shore zone than in remote areas. The high chloride levels after restoration impact internal nutrient availability in the Botshol wetlands, on soil loaded with P in recent and historic times.

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“…Substantial reduction of nutrient loading can be useful, particularly in cases when nutrients come from point sources (Simons et al 1994;Moss et al 1996a;Jeppesen et al 2005Jeppesen et al , 2007Søndergaard et al 2005a), but it might not produce the desired effect or such an effect can be considerably delayed in cases of accumulation of phosphorus in the sediment or diffuse external nutrient sources (Lauridsen et al 2003;Carpenter 2005;Søndergaard et al 2007) A number of studies have demonstrated, however, that sizeable reduction in fish densities shifts lakes and ponds from phytoplankton to submerged vegetation dominance, thus improving the water quality and reducing the risk of cyanobacterial bloom occurrence (Shapiro and Wright 1984;Shapiro 1990Shapiro , 1995Gulati and van Donk 2002;Søndergaard et al 2007;Van Wichelen et al 2007). Removal of all or most of the fish or addition of piscivores with the aim of reducing phytoplankton biomass is referred to as biomanipulation (Shapiro and Wright 1984;Moss et al 1996a).…”

Section: Introductionmentioning

confidence: 99%

Biomanipulation of hypereutrophic ponds: when it works and why it fails

Peretyatko

Teissier

Backer

et al. 2011

Environ Monit Assess

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Phytoplankton, zooplankton, submerged vegetation and main nutrients have been monitored in 48 eutrophic ponds from the Brussels Capital Region (Belgium) between 2005 and 2008. Nine ponds have been biomanipulated in order to improve their ecological quality and prevent the occurrence of noxious cyanobacterial blooms. The 4-year study of a large number of ponds allowed identification of the factors having the strongest influence on phytoplankton growth. Continuous monitoring of the biomanipulated ponds allowed the significance of changes caused by biomanipulation to be tested as well as the main reasons of biomanipulation successes and failures to be elucidated. The main factors controlling phytoplankton in the ponds studied appeared to be grazing by large cladocerans and inhibition of phytoplankton growth by submerged vegetation. Biomanipulation resulted in a significant decrease in phytoplankton biomass in general and biomass of bloom-forming cyanobacteria in particular that were associated with a significant increase in large Cladocera density and size. In six out of nine ponds biomanipulation resulted in the restoration of submerged vegetation. The maintenance of the restored clearwater state in the biomanipulated ponds was strongly dependent on fish recolonisation and nutrient level. In the absence of fish, the clearwater state could be maintained by submerged vegetation or large zooplankton grazing alone. In case of fish recolonisation, restoration of extensive submerged vegetation could buffer, to a considerable degree, the effect of fish except for ponds with high nutrient levels.

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Restoration of Botshol (The Netherlands) by reduction of external nutrient load: Recovery of the Characean community

Cited by 10 publications

References 7 publications

Effects of fish and nutrient additions on food‐web stability in a charophyte‐dominated lake

Effects of fish and nutrient additions on food‐web stability in a charophyte‐dominated lake

Effect of Different Chloride Concentrations on Nutrient Release in Wetland Soils: A Phytometer Assessment in the Botshol Wetlands, The Netherlands

Biomanipulation of hypereutrophic ponds: when it works and why it fails

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