Fish manipulation as a lake restoration tool in shallow, eutrophic temperate lakes 1: cross-analysis of three Danish case-studies

Jeppesen, Erik; Søndergaard, Martin; Mortensen, Erik Lykke; Kristensen, Peter; Riemann, Bo; Jensen, H.J.; Müller, J. P.; Sortkjær, Ole; Jensen, Jens Peder; Christoffersen, Kirsten; Bosselmann, Suzanne; Dall, E.

doi:10.1007/978-94-017-0924-8_17

Cited by 58 publications

(52 citation statements)

References 39 publications

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“…Phytoplankton production is 275 k 9 mm01 C m-2 d-' (Jeppesen et al 1997) and Secchi depth ranges between 55 and 85 cm (Jeppesen et al 1990). …”

Section: Methodsmentioning

confidence: 99%

“…We attribute these factors to mechanisms other than molecular diffusion controlling benthic solute exchange. Previous data of Ssndergaard (1990) indicate that benthic solute exchange in the lake is controlled by such mechanisms. Srandergaard found both enhanced gross phosphorus release from the lake sediment compared to what could be estimated from porewater profiles, and rapid changes in the phosphate porewater profiles after storms.…”

Section: Monthmentioning

confidence: 96%

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Denitrification in a soft bottom lake: evaluation of laboratory incubations

Risgaard-Petersen¹,

Skårup²,

Nielsen³

1999

Aquat. Microb. Ecol.

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Annual benthic denitnficatlon in a shallow soft bottom lake was estimated in laboratoryIncubated sediment cores, using the isotope pairing technique Rates were < 3 0 % of the estimate calculated from nitrogen mass balance of the lake. To investigate this discrepancy, in situ measurements were performed in flexible enclosures to which 15N03-was added. Accumulation of 29N2 and 30N2 in the sedunent and water column was measured and the loss to the atmosphere was estimated from depletion of argon, added in excess to the water of the enclosures. The calculated denitrification activities in the enclosures were 6 to 26 times higher than the activlty in the incubated cores. We suggest that denitrification in situ was enhanced b y wave forces, increasing the transport of oxygen and nitrate into these soft sediments. Such transport is not simulated by conventional stirring of the water column in laboratory incubations, which consequently may underestimate the in situ activity.

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“…Phytoplankton production is 275 k 9 mm01 C m-2 d-' (Jeppesen et al 1997) and Secchi depth ranges between 55 and 85 cm (Jeppesen et al 1990). …”

Section: Methodsmentioning

confidence: 99%

Section: Monthmentioning

confidence: 96%

Denitrification in a soft bottom lake: evaluation of laboratory incubations

Risgaard-Petersen¹,

Skårup²,

Nielsen³

1999

Aquat. Microb. Ecol.

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“…From 1964, the lake received wastewater from a small village, but this was diverted in 1981, projected to reduce the external phosphorus loading from 4 to 1.5 g·P·m −2 ·year −1 [2]. However, the lake remained eutrophic with a mean summer Secchi depth of 0.…”

Section: Study Areamentioning

confidence: 99%

“…Biomanipulation by removing zooplanktivorous and benthivorous fish has been used as a method to restore and improve lake water quality for many years [1][2][3][4][5]. By decreasing the top-down control from fish on particularly large-sized zooplankton, the aim is to increase the filtration of zooplankton capacity on phytoplankton and thereby create clearer water.…”

Section: Introductionmentioning

confidence: 99%

“…The failure to establish a long-lasting clear water state and inability to create permanent effects have been ascribed to a number of factors. First, adequate reduction of the external nutrient loading is crucial to obtain permanent effects [2,3,15,16]. In shallow lakes, TP concentrations below 0.05 mg·L −1 have been suggested as a prerequisite of this [17].…”

Section: Introductionmentioning

confidence: 99%

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Repeated Fish Removal to Restore Lakes: Case Study of Lake Væng, Denmark—Two Biomanipulations during 30 Years of Monitoring

Søndergaard

Lauridsen

Johansson

2017

Water

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Biomanipulation by fish removal has been used in many shallow lakes as a method to improve lake water quality. Here, we present and analyse 30 years of chemical and biological data from the shallow and 16 ha large Lake Vaeng, Denmark, which has been biomanipulated twice with a 20-year interval by removing roach (Rutilus rutilus) and bream (Abramis brama). After both biomanipulations, Lake Vaeng shifted from a turbid, phytoplankton-dominated state to a clear, water macrophyte-dominated state. Chlorophyll a was reduced from 60-80 µg·L −1 to 10-30 µg·L −1 and the coverage of submerged macrophytes, dominated by Elodea canadensis, increased from <0.1% to 70%-80%. Mean summer total phosphorus was reduced from about 0.12 to 0.07 mg·L −1 and total nitrogen decreased from 1.0 to 0.4 mg·L −1 . On a seasonal scale, phosphorus and chlorophyll concentrations changed from a summer maximum during turbid conditions to a winter maximum under clear conditions. The future of Lake Vaeng is uncertain and a relatively high phosphorus loading via the groundwater, and the accumulation of a mobile P pool in the sediment make it likely that the lake eventually will return to turbid conditions. Repeated fish removals might be a relevant management strategy to apply in shallow lakes with a relatively high external nutrient loading.

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The impact of human activity on the aquatic macroflora of Llangorse Lake, South Wales

Wade

1999

Aquatic Conserv: Mar. Freshw. Ecosyst.

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1. The first recorded effects of human activity on the aquatic flora of Llangorse Lake, South Wales, were the result of introductions of Elodea canadensis in the early 1900s and of Nymphoides peltata in 1936, altering the species balance of both submerged and floating plant communities. 2. The most significant impact on the lake in recent times has been effluent from the sewage treatment works, which discharged into the lake between the early 1950s and 1982, and the impact of a concurrent intensification of agriculture within the catchment, both leading to accelerated eutrophication. 3. The eutrophication of the lake resulted in a significant change in the submerged flora, which declined in diversity and extent to only a few stands of two species in 1982. 4. Following the diversion of the sewage effluent, the submerged flora recovered to a situation similar to that existing before the effects of accelerated eutrophication. 5. The emergent and floating plant communities did not reflect the eutrophication in the same way as the submerged flora, although Equisetum fluviatile has declined noticeably. 6. The floating and emergent communities, notably Phragmites australis reed swamp, have been significantly damaged in the immediate vicinity of mooring developments, but elsewhere the introduction of water‐based recreation cannot be demonstrated to have had a widespread detrimental effect. 7. The recovery of the submerged plant community is considered to be in part due to residual populations of the various species ‘lost’ from the main body of the lake existing in refugia in and around the lake. 8. The history of the lake is notable in terms of the recovery of the submerged flora and in the absence of dominants new to the system invading during the period of accelerated eutrophication. Copyright © 1999 John Wiley & Sons, Ltd.

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Fish manipulation as a lake restoration tool in shallow, eutrophic temperate lakes 1: cross-analysis of three Danish case-studies

Cited by 58 publications

References 39 publications

Denitrification in a soft bottom lake: evaluation of laboratory incubations

Denitrification in a soft bottom lake: evaluation of laboratory incubations

Repeated Fish Removal to Restore Lakes: Case Study of Lake Væng, Denmark—Two Biomanipulations during 30 Years of Monitoring

The impact of human activity on the aquatic macroflora of Llangorse Lake, South Wales

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