Conditions for effective biomanipulation; conclusions derived from whole-lake experiments in Europe

Benndorf, Jürgen

doi:10.1007/978-94-017-0924-8_16

Cited by 122 publications

(113 citation statements)

References 19 publications

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“…Shifts in abundance and composition of phytoplankton and zooplankton, following a manipulation of the fish population, have been observed in several whole-lake food-web experiments (Shapiro, 1990;Benndorf, 1990). Most of these experiments, however, were followed over relatively short periods only.…”

Section: Discussionmentioning

confidence: 98%

Macrophyte-related shifts in the nitrogen and phosphorus contents of the different trophic levels in a biomanipulated shallow lake

Donk

Gulati²,

Iedema

et al. 1993

Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers

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Lake Zwemlust, a small highly eutrophic lake, was biomanipulated without reducing the external nutrient loading, and the effects were studied for four years. In this paper we pay special attention to the shifts in relative distribution of nitrogen and phosphorus in the different trophic levels and to the changes in growth limitation of the autotrophs.Despite of the high external nutrient loads to the lake (ca 2.4 g P me2 y-' and 9.6 g N m-* y-'), the effects of biomanipulation on the lake ecosystem were pronounced. Before biomanipulation no submerged vegetation was present in the lake and P and N were stored in the phytoplankton (44% N, 47% P), fish (33% N, 9% P) and in dissolved forms (23% N, 44% P). P and N contents in sediments were not determined. In the spring and summer following the biomanipulation (1987), zooplankton grazing controlled the phytoplankton biomass and about 90 y0 of N and P were present in dissolved form in the water. From 1988 onwards submerged macrophyte stands continue to thrive, reducing the ammonium and nitrate concentrations in the water below detection levels. In July 1989 storage of N and P in the macrophytes reached 86% and SO%, respectively. Elodea nuttallii (Planchon) St.John, the dominant species in 1988 and 1989, acted as sink both for N and P during spring and early summer, withdrawing up to ca 60% of its N and P content from the sediment. At the end of the year only part of the N and P from the decayed macrophytes (ca 30 y0 of N and 60 y0 of P) was recovered in the water phase of the ecosystem (chiefly in dissolved forms). The rest remained in the sediment, although some N may have been released from the lake by denitrification.In summer 1990 only 30% of the N and P was found in the macrophytes (dominant species Ceratophyllum demersum L.), while ca 30% of N and P was again stored in phytoplankton and fish.

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Section: Discussionmentioning

confidence: 98%

Macrophyte-related shifts in the nitrogen and phosphorus contents of the different trophic levels in a biomanipulated shallow lake

Donk

Gulati²,

Iedema

et al. 1993

Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers

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“…For the past loading, values of 1975 were used, resembling the highest loading in lake IJsselmeer of the last decades (6 g P m -2 y -1 and 100 g N m -2 y -1 ). These loading rates exceed most reported values for restoration of a clear state of shallow lakes (e.g., Jeppesen 1991;Benndorf 1990). The loading rate was assumed to be constant over the year.…”

Section: Scenariosmentioning

confidence: 78%

The Contribution of Marsh Zones to Water Quality in Dutch Shallow Lakes: A Modeling Study

Sollie

Janse

Mooij

et al. 2008

Environmental Management

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Many lakes have experienced a transition from a clear into a turbid state without macrophyte growth due to eutrophication. There are several measures by which nitrogen (N) and phosphorus (P) concentrations in the surface water can be reduced. We used the shallow lake model PCLake to evaluate the effects of three measures (reducing external nutrient loading, increasing relative marsh area, and increasing exchange rate between open water and marsh) on water quality improvement. Furthermore, the contribution of different retention processes was calculated. Settling and burial contributed more to nutrient retention than denitrification. The model runs for a typical shallow lake in The Netherlands showed that after increasing relative marsh area to 50%, total phosphorous (TP) concentration in the surface water was lower than the Maximum Admissible Risk (MAR, a Dutch government water quality standard) level, in contrast to total nitrogen (TN) concentration. The MAR levels could also be achieved by reducing N and P load. However, reduction of nutrient concentrations to MAR levels did not result in a clear lake state with submerged vegetation. Only a combination of a more drastic reduction of the present nutrient loading, in combination with a relatively large marsh cover (approximately 50%) would lead to such a clear state. We therefore concluded that littoral marsh areas can make a small but significant contribution to lake recovery.

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“…And if loading is reduced, biomanipulation needs to be less intense (Benndorf 1991) for recovery of the clear water conditions, and its effects, in terms of macrophyte abundance, may be more prolonged.…”

Section: The Alternative States Hypothesismentioning

confidence: 99%

Lakes and society: Mirrors to our past, present and future

Moss¹

2007

Lake and Reservoir Management

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Conditions for effective biomanipulation; conclusions derived from whole-lake experiments in Europe

Cited by 122 publications

References 19 publications

Macrophyte-related shifts in the nitrogen and phosphorus contents of the different trophic levels in a biomanipulated shallow lake

Macrophyte-related shifts in the nitrogen and phosphorus contents of the different trophic levels in a biomanipulated shallow lake

The Contribution of Marsh Zones to Water Quality in Dutch Shallow Lakes: A Modeling Study

Lakes and society: Mirrors to our past, present and future

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