Herbivory by waterfowl and fish on macrophytes in a biomanipulated lake: effects on long-term recovery

Donk, Ellen Van; Deckere, Eric de; Breteler, J.G.P. Klein; Meulemans, John T.

doi:10.1080/03680770.1992.11900577

Cited by 20 publications

(16 citation statements)

References 13 publications

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“…Growth of stands at the exposed and sheltered site probably differed due to differences in wave stress (Ozimek et al, 1986) and/or grazing pressure, as the contents of organic matter in the sediment were comparable (unpublished) and periphyton densities were not significantly different (Roberts et al, 2003). Contrary to the findings of Van Donk et al (1994), macrophyte consumption by vertebrate grazers did negatively affect the recovery of submerged macrophytes in Lake Mu¨ggelsee, as protection resulted in significantly higher biomass. Exclosure experiments revealed that fish have a higher impact than waterfowl although the known herbivorous fish species like rudd (S. erythrophthalmus) or carp (Cyprinus carpio) were not abundant in the lake.…”

Section: Discussioncontrasting

confidence: 59%

“…Perrow et al (1997), however, state that there is little evidence in the literature to support this hypothesis and Van Donk et al (1994) and Mitchell & Wass (1996) could not find a significant effect of waterfowl grazing on the (re-) establishment of submerged plants. Other investigations do suggest an impact of fish, usually rudd (Scardinius erythrophthalmus) on macrophyte growth (Prejs, 1984;Van Donk et al, 1994). Several authors proposed that grazing might be critical for macrophyte development in lakes at the nutrient threshold where both a clearwater and a turbid state may occur (Søndergaard et al, 1996) and when light or other conditions for macrophyte growth are marginal (Mitchell & Wass, 1996).…”

Section: Introductionmentioning

confidence: 59%

“…Lauridsen et al, 1993;Søndergaard et al, 1996). Perrow et al (1997), however, state that there is little evidence in the literature to support this hypothesis and Van Donk et al (1994) and Mitchell & Wass (1996) could not find a significant effect of waterfowl grazing on the (re-) establishment of submerged plants. Other investigations do suggest an impact of fish, usually rudd (Scardinius erythrophthalmus) on macrophyte growth (Prejs, 1984;Van Donk et al, 1994).…”

Section: Introductionmentioning

confidence: 63%

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Recovery of Potamogeton pectinatus L. stands in a shallow eutrophic lake under extreme grazing pressure

Hilt¹

2006

Hydrobiologia

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In shallow lakes, submerged macrophytes contribute to the stabilization of the clear water state. If lost, a number of mechanisms prevent re-colonization. Lake Mu¨ggelsee (730 ha) lost its submerged vegetation due to increasing eutrophication and switched to phytoplankton dominance in 1970. After the reduction of nutrient loading in 1990, Potamogeton pectinatus L. started re-colonizing the lake. During the following years, it spread at a mean rate of 2.5 ha per year to all available areas <80 cm depth. Between 1993 and 1999, decreasing maximum biomass indicated hampered growth. Exclosure experiments revealed that herbivory reduced the aboveground biomass by more than 90%. Both waterfowl and fish were found to contribute to the grazing pressure despite a low abundance of the known herbivorous fish species and waterfowl in spring and summer. Protection of stands against grazing resulted in higher biomass of shoots, whereas shoot and tuber density did not change. Both shading by phytoplankton and periphyton, as well as grazing pressure, prevented the submerged vegetation of Lake Mu¨ggelsee from developing back to a dense zone that contributed to the reduction of turbidity.

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Section: Discussioncontrasting

confidence: 59%

Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 63%

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Recovery of Potamogeton pectinatus L. stands in a shallow eutrophic lake under extreme grazing pressure

Hilt¹

2006

Hydrobiologia

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“…can have a major impact on fennel pondweed biomass (Anderson & Low, 1976;Søndergaard et al, 1996;Mitchell & Perrow, 1998). Other researchers also suggest that the impact of fish may be important either directly through herbivory (e.g Van Donk et al, 1994) or indirectly through reduction of water clarity when the fish search for invertebrates in the sediment (Beklioglu et al, 2003), and through predation on large-bodied daphnids so that the indirect effects of reduced light may become intensified through eutrophication (Scheffer et al, 1993). Fish like tench (Tinca tinca) and carp (Cyprinus carpio) mainly feed on benthic macroinvertebrates, and prefer habitats with abundant macrophytes.…”

Section: Introductionmentioning

confidence: 96%

Effects of waterfowl, large fish and periphyton on the spring growth of Potamogeton pectinatus L. in Lake Mogan, Turkey

2005

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It has been argued that waterfowl and fish may threaten growth of submerged macrophytes, especially in spring during the early growth phase when plant biomass is low. A small reduction of biomass at that time might delay growth or decrease subsequent productivity. We investigated the impact of waterfowl and large fish on the spring growth of fennel pondweed (Potamogeton pectinatus L.) by employing an exclosure experiment in the macrophyte-dominated clear-water Lake Mogan, Turkey. Birds and large fish were excluded from eight plots and both in situ vegetation and macrophytes kept in pots were compared to eight open plots. Also, to investigate the effect of periphyton on plant growth it was removed from half of the pot plants. Exclusion of waterfowl and fish may decrease predation on macroinvertebrates, which in turn may affect periphyton, and macrophyte growth, why macroinvertebrates also were sampled. Waterfowl density was high (15-70 ind. of coot, Fulica atra L. ha )1 ), abundance of submerged plants was also high with a surface coverage of 70-80%, and benthivorous fish were present, mainly tench, (Tinca tinca L.) and carp, (Cyprinus carpio L.). Exclusion of waterfowl and large fish did not significantly affect the spring growth of pondweed; neither plants growing in situ nor kept in pots. Removal of periphyton from the plants in the pots did not favour growth. The density of macroinvertebrates was not affected by the exclusion of waterfowl and large fish, but it was positively related to aboveground biomass of fennel pondweed. We suggest that even if waterfowl and large fish are in high densities, their effect on fennel pondweed spring growth in lakes with abundant submerged vegetation, such as Lake Mogan, is low.

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“…The impact on sediments, vegetation and macroinvertebrates may have consequences for juvenile and adult fish (Crowder and Cooper 1982;Hanson and Legett, 1982;Mittelbach 1984;Keast 1985), and waterfowl (Szijj 1965;van Donk et al 1994;Sønderg-aard et al 1996;Schmieder et al 2006) which feed on macro-invertebrates or on Chara stands together with their epifauna. However, functional chains are complex, and include the structuring role of swinging circles, the shading by boats, the disturbance frequency by yachtsman, as well as behavioural patterns of the species in question.…”

Section: Discussionmentioning

confidence: 99%

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

Ostendorp

Gretler²,

Mainberger³

et al. 2008

Wetlands Ecol Manage

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Mooring areas are a common form of berthing in many of Germany's inland waters for the growing number of sporting boats. A circular swinging zone around the anchor zone is formed, in which the submerged macrophyte vegetation is destroyed to a large extent, and the sediment surface is eroded. We investigated the effects of two types of buoy (conventional and so-called hook-buoys) in comparison with undisturbed reference sites nearby. The aim of the study was to identify possible harmful consequences of mooring sites to lake littoral habitats in Lake Constance-Untersee, and to provide information to managers to aid them in the formulation of mooring management plans with the least ecological impact. The study focused on submerged vegetation, surface sediments and macro-invertebrate colonisation. In the swinging circle of conventional buoys (87 m 2 ) we observed a significant sediment matter erosion of 0.9 tonnes and a reduction of organic matter amount by 4.5% of the undisturbed reference. The vegetation free area increased by 122%, and the phytomass (mainly Chara div. spp.) was reduced by 14.6% per berth. The psammophilous macro-invertebrate numbers were not significantly affected (-3%) in contrast to the phytophilous taxa which were reduced by 12.7% per berth. The mayfly larvae were the most negatively affected taxon. Oligochaetes profited from the clearing of the sediment surface in the swinging circles. The ecological effects of the hook-buoys were more minor, mainly due to the smaller swinging circle (6 m 2 ). We concluded that the detrimental effects of mooring can be significantly reduced by mooring systems, e. g. the hookbuoy system as it was used in this study, which reduce the area disturbed and cleared by the anchor chain. We argue that these results can be generalised to mooring areas with soft bottom and dense macrophyte vegetation in Lake Constance and other large lakes.

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Herbivory by waterfowl and fish on macrophytes in a biomanipulated lake: effects on long-term recovery

Cited by 20 publications

References 13 publications

Recovery of Potamogeton pectinatus L. stands in a shallow eutrophic lake under extreme grazing pressure

Recovery of Potamogeton pectinatus L. stands in a shallow eutrophic lake under extreme grazing pressure

Effects of waterfowl, large fish and periphyton on the spring growth of Potamogeton pectinatus L. in Lake Mogan, Turkey

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

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