The potential to retain nitrogen in beaver ponds and delta floodplains of the River Nemunas.

Lamsodis, Romanas; Vaikasas, Saulius

doi:10.1127/lr/15/2003/225

Cited by 4 publications

(3 citation statements)

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“…Modification of natural flow regimes alters the abundance and composition of biological conditions in aquatic environments (Wright et al 2002;Winterwerp, Kesteren 2004;Ambers 2007;Soulsby et al 2010). Dams affect ecosystems in a number of ways: by altering the natural flow fluctuations, modifying the physicochemical characteristics of riverine water and fragmenting the continuity of rivers (Grzybkowska, Dukowska 2002;Bahuguna et al 2004;Lamsodis, Vaikasas 2005;Penczak, Kruk 2005;Pietraszewski et al 2008;Zdankus et al 2008;Vaikasas 2010).…”

Section: Introductionmentioning

confidence: 99%

Influence of hydropower dams on the state of macroinvertebrates assemblages in the Virvyte river, Lithuania

Vaikasas

Palaima

Pliūraitė

2013

Journal of Environmental Engineering and Landscape Management

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Macroinvertebrate organization along the Virvyte ˙River was examined to relate biological response in environmental changes. Benthic macroinvertebrates and a range of environmental variables were sampled from three study sections: control, HPP dams and below HPP dams. Total macroinvertebrate taxon number (NT 28), EPT taxon number (NT 13) and Shannon-Wiener diversity index (H´3.85) were the highest in control sites of the river and the smallest in HPP dams (17, 5, 2.75, respectively). Taxon number and total abundance of macroinvertebrates declined significantly both in HPP dams and below them in comparison with the control sites. Total macroinvertebrate abundance in the control sites (698±41 ind.m 2 ) was significantly higher than in HPP dams and below them (430± 21 ind.m 2 and 425±22 ind.m 2 , respectively). The obtained data show that the investigated sections differed in terms of composition and relative abundance of different taxa of macroinvertebrates. Compared to reference conditions (control sites), macroinvertebrate samples from the sites below the dams and in them had relatively more Chironomidae larvae, Oligochaeta and Mollusca and fewer of the more sensitive taxa Plecoptera, Ephemeroptera and Trichoptera. According to Danish Stream Fauna Index and Hilsenhoff biotic index, water quality in the Virvyte Ṙiver control sites was higher in comparison with water quality in HPP dams and below-dam sites.

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Section: Introductionmentioning

confidence: 99%

Influence of hydropower dams on the state of macroinvertebrates assemblages in the Virvyte river, Lithuania

Vaikasas

Palaima

Pliūraitė

2013

Journal of Environmental Engineering and Landscape Management

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“…(1996) there was a significant decrease in the concentrations of nitrates found in water drained from dammed up subsurface drains. It is worth noting here that when water is flowing via beaver‐impounded stretches of open drains, nutrient (nitrate and phosphorus) concentrations have been shown to decrease as well (Lamsodis, 2003; Lamsodis and Vaikasas, 2005).…”

Section: Discussionmentioning

confidence: 99%

Attempt to manage after‐effects of beaver impounding activities in drainage systems: One trial assay

Lamsodis¹

2011

Irrigation and Drainage

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When there is a high population density of beavers, they readily occupy open drains. By impounding these drains, the animals also dam up the subsurface drainage systems that empty into them. This paper provides the results from a trial conducted in a beaver-obstructed stretch of the open drain, Ž iedupis, and its environs in the Nevėžis River basin in Lithuania. Studies were carried out on the functioning of pond drains installed in beaver dams, the behaviour of beavers in reacting to the lowered water levels, the condition of the tile drain pipes operating under damming, and the hydrological conditions of the soils drained by these drains. The trial was conducted in soils with a light texture. The weather conditions were generally rather drier than average. It was found that pond drains were able to maintain water in ponds at the desirable levels that benefit the functioning of subsurface drainage systems. However, they did not prevent beavers from building new dams, and did not encourage the animals to abandon the beaver site. Possible reasons for beaver expansion into open drains, as well as ways to avoid or mitigate the harm from their damming of drainage systems, are also discussed in the paper. Copyright # 2010 John Wiley & Sons, Ltd. RÉ SUMÉQuand il y a une forte densité de population de castors, ils occupent volontiers les fossés. En occupant ces fossés, les animaux tassent aussi les drains enterrés qui s'y déversent. L'article présente les résultats d'un essai mené sur tronçon du collecteur ouvert obstrué par les castors, Ž iedupis dans le bassin du fleuve Nevėžis en Lituanie. Des études ont été menées sur le fonctionnement de drains de vidange mis en place dans les barrages de castors, le comportement des castors en réaction à la baisse des niveaux d'eau, le comportement des drains sous le tassement, et les conditions hydrologiques des sols drainés par ces drains. L'essai s'est déroulé dans des sols à texture légère. Les conditions météorologiques étaient généralement plutôt plus sèches que la moyenne. Il a été constaté que ces drains ont été en mesure de maintenir l'eau au niveau souhaitable bénéficiant du fonctionnement des systèmes de drainage souterrain. Toutefois, ils n'ont pas empêché les castors de construire de nouveaux barrages, et n'encouragent pas les castors à abandonner leurs sites. Les raisons possibles pour l'expansion du castor dans les fossés, ainsi que les façons d'éviter ou d'atténuer les effets dommageables du tassement des drains enterrés, sont également discutées dans l'article.

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“…It has been determined that during floods the sedimentation and absorption processes result in increased amounts of nutrients available to plants which are contained in the soils of the flooded polders of the Nemunas lowland (Gipiškis, 2000;Mališauskas and Š ileika, 2001;Lamsodis and Vaikasas, 2005). For example, after the spring flood the soil of the Š yša summer polder contained much higher amounts of plantavailable nutrients compared with the winter polder (Figure 4).…”

Section: Sedimentation Regime and Nutrient Retention Conditionsmentioning

confidence: 96%

Water management tasks in the summer polders of the Nemunas lowland

Lukianas¹,

Vaikasas²,

Mališauskas³

2006

Irrigation and Drainage

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Surplus water during floods as well as the low level of the soil surface determine the complicated ecological, economic and demographic conditions in the Nemunas delta. Subsequently, it leads to different types and intensity of use of farmland as well as different methods of water regime regulation: summer or winter type polders. The building of 17 summer polders in the 32 500 ha floodplain area was a compromise, seeking to improve farming conditions and maintain the stability of the flood regime and ecology in the delta. Field measurements and mathematical modelling were carried out. As study results have shown, grass yield losses due to flooding depend on the distribution of water levels and flood duration in the summer polders. Relative damage to agriculture is insignificant and makes up only 10-15% of the total amount of flood damage in the Nemunas lowland.The field measurements and hydraulic and mathematical modelling of flow and sediment regime as well as study of flooding and changed farming conditions also show that it is possible to reduce the height of floods and economic and ecological damage. Rearrangement of the system of protective dikes, regulation of the main river canal and water/sedimentation regime with the help of pumping stations, decrease of pollutant migration into the Curonian Lagoon and Baltic Sea, and recreation of natural meadows are important in that case. Copyright convient de réorganiser le système des digues de protection, de réguler le chenal principal du fleuve et le régime de sédimentation des eaux à l'aide de stations de pompage, de réduire les déversements polluants dans la lagune Curonian et la mer Baltique, et de régénérer des pâturages naturels.

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The potential to retain nitrogen in beaver ponds and delta floodplains of the River Nemunas.

Cited by 4 publications

References 0 publications

Influence of hydropower dams on the state of macroinvertebrates assemblages in the Virvyte river, Lithuania

Influence of hydropower dams on the state of macroinvertebrates assemblages in the Virvyte river, Lithuania

Attempt to manage after‐effects of beaver impounding activities in drainage systems: One trial assay

Water management tasks in the summer polders of the Nemunas lowland

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