Submerged macrophytes in the recently freshened lake system Volkerak-Zoom (The Netherlands), 1987–1991

Schutten, J.; Velden, J.A. van der; Smit, Harry

doi:10.1007/978-94-017-2460-9_18

Cited by 8 publications

(9 citation statements)

References 9 publications

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“…Giles (1994) showed similar effects of fish removal in a biomanipulated gravel pit by comparison with an unmanipulated control pit. Similar large, long-term changes in vegetation and parallel changes in populations of coots, swans, and herbivorous and omnivorous ducks have been reported, among others, by Hargeby et al (1994), Lauridsen et al (1994), Schutten et al (1994), van Donk et al (1994), and S!Ilndergaard et al (this volume, Chapter 20). In Hawksbury Lagoon, New Zealand, black swan population densities followed the week-to-week changes in biomass of aquatic vegetation remarkably closely during a 7-month period (Mitchell and Wass, 1996a).…”

Section: Water Birds and Macrophyte Abundancementioning

confidence: 62%

Interactions Between Grazing Birds and Macrophytes

Mitchell¹,

Perrow²

1998

The Structuring Role of Submerged Macrophytes in Lakes

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Section: Water Birds and Macrophyte Abundancementioning

confidence: 62%

Interactions Between Grazing Birds and Macrophytes

Mitchell¹,

Perrow²

1998

The Structuring Role of Submerged Macrophytes in Lakes

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“…The vertical projected sediment coverage of each macrophyte species (all vascular plants and Chara spp.) and filamentous algae as well as total community cover along the line and in the area up to 2 m (depending on visibility) on either side of the line were estimated using an adapted Tansley scale (see Schutten et al (1994) for details).…”

Section: Macrophyte Monitoringmentioning

confidence: 99%

“…However, information relating to the impact of grazing by birds frequently relies on experiments using macrophytes transplanted into the site (Lauridsen et al, 1993;Moss et al, 1996;Søndergaard et al, in press), rather than the impact on naturally occurring macrophytes (Anderson & Low, 1976;Esler, 1989). Alternatively, a measure of macrophyte production is compared with losses due to grazing often derived by multiplying the number of bird days against some estimate of dietary input derived from the literature (Kiørboe, 1980;Schutten et al, 1994). In addition, there is often little attempt to determine macrophyte/bird interactions in relation to population parameters, including seasonal fluctuation, macrophyte phenology or actual bird diet.…”

Section: Introductionmentioning

confidence: 99%

Interactions between coot (Fulica atra) and submerged macrophytes: the role of birds in the restoration process

et al. 1997

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Interactions between coot (Fulica atra) and submerged macrophytes: the role of birds in the restoration process. Perrow, M.R.; Schutten, J.; Howes, J.R.; Holzer, T.; Madgewick, F.J.; Jowitt, A.J.D. Published in: Hydrobiologia Link to publicationCitation for published version (APA): Perrow, M. R., Schutten, J., Howes, J. R., Holzer, T., Madgewick, F. J., & Jowitt, A. J. D. (1997). Interactions between coot (Fulica atra) and submerged macrophytes: the role of birds in the restoration process. Hydrobiologia, 242/243, 241-255. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. AbstractGrazing by herbivorous birds is often cited as an important factor in suppressing macrophyte development in shallow lakes undergoing restoration, thus delaying the attainment of the stable clear water state. Development and succession of macrophyte communities and size, diet and grazing pressure of coot (Fulica atra) populations upon macrophytes, were monitored over the seasonal cycle at ten shallow lakes of varying nutrient status, in the Norfolk Broads in eastern England. In spring, territorial breeding birds were at relatively low density and included only a small proportion of macrophytes in their diet, resulting in low grazing pressure on macrophytes. In summer, there was a significant relationship between macrophyte cover and bird density, illustrating the importance of macrophytes in the dispersion phase for birds following breeding. Macrophytes comprised the bulk of bird diet where they were available and the consumption of macrophytes was up to 76 fold higher than in spring. However, losses to grazing in both periods were negligible when compared to potential growth rates documented in the literature. Grazing experiments at two biomanipulated lakes confirmed that birds were not responsible for limiting macrophytes during the spring colonisation phase or in the summer growth period. During the period of autumnal senescence and over the winter months where some macrophyte species remain available, e.g. as developed individuals or dormant buds, grazing by birds may conceivably have an impact on the development and structure of macrophyte populations in subsequent growing seasons.The relative importance of bird grazing compared to other factors limiting the development of macrophytes...

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“…By filling the water column with dense and complex physical structure, macrophytes provide food (plants themselves and associated periphyton) and habitat for a host of organisms. The functional role of macrophytes tends to be greatest when plants fill the entire water column and when the growing season is long (Schutten, van der Velden & Smit, 1994). The functional role of macrophytes tends to be greatest when plants fill the entire water column and when the growing season is long (Schutten, van der Velden & Smit, 1994).…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of macrophytes and phytoplankton in shallow lakes: a eutrophication‐driven pathway from plants to plankton?

2010

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Summary 1. Seasonal relationships between macrophyte and phytoplankton populations may alter considerably as lakes undergo eutrophication. Understanding of these changes may be key to the interpretation of ecological processes operating over longer (decadal‐centennial) timescales. 2. We explore the seasonal dynamics of macrophytes (measured twice in June and August) and phytoplankton (measured monthly May–September) populations in 39 shallow lakes (29 in the U.K. and 10 in Denmark) covering broad gradients for nutrients and plant abundance. 3. Three site groups were identified based on macrophyte seasonality; 16 lakes where macrophyte abundance was perennially low and the water generally turbid (‘turbid lakes’); 7 where macrophyte abundance was high in June but low in August (‘crashing’ lakes); and 12 where macrophyte abundance was high in both June and August (‘stable’ lakes). The seasonal behaviour of the crashing and turbid lakes was extremely similar with a consistent increase in nutrient concentrations and chlorophyll‐a over May–September. By contrast in the stable lakes, seasonal changes were dampened with chlorophyll‐a consistently low (<10–15 μg L−1) over the entire summer. The crashing lakes were dominated by one or a combination of Potamogeton pusillus, Potamogeton pectinatus and Zannichellia palustris, whereas Ceratophyllum demersum and Chara spp. were more abundant in the stable lakes. 4. A long‐term loss of macrophyte species diversity has occurred in many shallow lakes affected by eutrophication. One common pathway is from a species‐rich plant community with charophytes to a species‐poor community dominated by P. pusillus, P. pectinatus and Z. palustris. Such compositional changes may often be accompanied by a substantial reduction in the seasonal duration of plant dominance and a greater tendency for incursions by phytoplankton. We hypothesise a slow‐enacting (10–100 s years) feedback loop in nutrient‐enriched shallow lakes whereby increases in algal abundance are associated with losses of macrophyte species and hence different plant seasonal strategies. In turn such changes may favour increased phytoplankton production thus placing further pressure on remaining macrophytes. This study blurs the distinction between so‐called turbid phytoplankton‐dominated and clear plant‐dominated shallow lakes and suggests that plant loss from them may be a gradual process.

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Submerged macrophytes in the recently freshened lake system Volkerak-Zoom (The Netherlands), 1987–1991

Cited by 8 publications

References 9 publications

Interactions Between Grazing Birds and Macrophytes

Interactions Between Grazing Birds and Macrophytes

Interactions between coot (Fulica atra) and submerged macrophytes: the role of birds in the restoration process

Seasonal dynamics of macrophytes and phytoplankton in shallow lakes: a eutrophication‐driven pathway from plants to plankton?

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