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Perrow, Martin R.; Schutten, J.; Howes, John R.; Holzer, Tim; Madgwick, F. Jane; Jowitt, Adrian J. D.

doi:10.1023/a:1017007911190

Cited by 77 publications

(2 citation statements)

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“…Waterweed species are non-native yet widespread in NW Europe and they are often among the first macrophytes to return after restoration measures have been taken (Heimans and Thijsse 1895; Perrow et al 1997; Pot and ter Heerdt 2014; Immers et al 2015). They are documented to cause nuisance by their mass development and are subject to mowing management (Hilt et al 2006; Zehnsdorf et al 2015).…”

Section: Methodsmentioning

confidence: 99%

Mowing Submerged Macrophytes in Shallow Lakes with Alternative Stable States: Battling the Good Guys?

Kuiper

Verhofstad

Louwers

et al. 2017

Environmental Management

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Submerged macrophytes play an important role in maintaining good water quality in shallow lakes. Yet extensive stands easily interfere with various services provided by these lakes, and harvesting is increasingly applied as a management measure. Because shallow lakes may possess alternative stable states over a wide range of environmental conditions, designing a successful mowing strategy is challenging, given the important role of macrophytes in stabilizing the clear water state. In this study, the integrated ecosystem model PCLake is used to explore the consequences of mowing, in terms of reducing nuisance and ecosystem stability, for a wide range of external nutrient loadings, mowing intensities and timings. Elodea is used as a model species. Additionally, we use PCLake to estimate how much phosphorus is removed with the harvested biomass, and evaluate the long-term effect of harvesting. Our model indicates that mowing can temporarily reduce nuisance caused by submerged plants in the first weeks after cutting, particularly when external nutrient loading is fairly low. The risk of instigating a regime shift can be tempered by mowing halfway the growing season when the resilience of the system is highest, as our model showed. Up to half of the phosphorus entering the system can potentially be removed along with the harvested biomass. As a result, prolonged mowing can prevent an oligo—to mesotrophic lake from becoming eutrophic to a certain extent, as our model shows that the critical nutrient loading, where the lake shifts to the turbid phytoplankton-dominated state, can be slightly increased.

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Section: Methodsmentioning

confidence: 99%

Mowing Submerged Macrophytes in Shallow Lakes with Alternative Stable States: Battling the Good Guys?

Kuiper

Verhofstad

Louwers

et al. 2017

Environmental Management

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show abstract

“…Even though 'pioneer' species like H. ovalis generally recover more quickly from grazing than larger 'climax'species (e.g. Eklöf et al 2008b), and loss of benthic estuarine vegetation could decrease swan abundance and indirectly reduce grazing pressure (McKinnon and Mitchell 1994), shading-induced community shifts to domination by persistent and recurring phytoplankton blooms can be maintained by even moderate black swan grazing pressure Perrow et al 1997). …”

Section: Swan-seagrass Interactions In the Historical And Present Setmentioning

confidence: 99%

Effects of multiple disturbances in seagrass meadows: shading decreases resilience to grazing

Eklöf

McMahon

Lavery

2009

Mar. Freshwater Res.

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Abstract. Ecosystem shifts are often associated with multiple disturbances, but limited knowledge on the mechanisms involved hampers management. This study investigated how short-term shading affected the resilience of the seagrass Halophila ovalis to grazing by black swans (Cygnus atratus) -a historically dominant grazer currently recovering from hunting and habitat loss -in south-western Australian estuaries, using field surveys and a grazing-shading experiment. Black swans were heterogeneously distributed and, in a high-density site, consumed 23% of seagrass production. Seagrasses recovered rapidly from a single disturbance (i.e. short-term shading or grazing), even though shading alone halved carbohydrate content. When seagrasses were exposed to both disturbances, recovery depended on the type of grazing; where grazing was confined to leaves, leaf densities recovered within 3 weeks, but where grazing was on both leaves and rhizomes there was no recovery. Shading increased the frequency of apex initiation, as did rhizome grazing, but only if the plants had not been shaded. This indicates that shading alters the flow of energy needed to produce apices and leaves following disturbance on rhizomes. Based on the historical swan densities and continuing recurring phytoplankton blooms, management actions reintroducing swans without controlling algal blooms could have an on impact seagrass resilience and associated organisms.

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Restoration of Ormesby Broad Through Biomanipulation: Ecological, Technical and Sociological Issues

Tomlinson

Perrow

Hoare

et al. 2002

Management and Ecology of Lake and Reservoir Fisheries

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Untitled

Cited by 77 publications

References 0 publications

Mowing Submerged Macrophytes in Shallow Lakes with Alternative Stable States: Battling the Good Guys?

Mowing Submerged Macrophytes in Shallow Lakes with Alternative Stable States: Battling the Good Guys?

Effects of multiple disturbances in seagrass meadows: shading decreases resilience to grazing

Restoration of Ormesby Broad Through Biomanipulation: Ecological, Technical and Sociological Issues

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