The Daugava (Zapadnaja Dvina) Zooplankton From Surozha (Belarus) to Dunava (Latvia)

Deksne, Rasma; Skute, Arturs; Skute, Renate

doi:10.17770/etr2009vol2.1018

Cited by 1 publication

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“…Consolidated sedimentary rocks dominate in the catchment, and the mean slope of the river is only 0.3%. The river flow velocity is highly variable: from 0.1 to more than 2 m s -1 (Deksne et al, 2009). The longterm average runoff of the Daugava River is 21.1 km 3 y -1 .…”

Section: Study Sitementioning

confidence: 99%

Dynamics of silica and phytoplankton population under altered conditions of river flow in the Daugava River, Latvia

Aigars¹,

Jurgensone²,

Jansons³

2014

Estonian J. Ecol.

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Three dams affect the flow of the lower Daugava River. The water reservoirs created by damming are relatively small with residence times from three to nine days. However, the water flow alteration is sufficient to cause a decrease in the phytoplankton biomass from an average of 246 to 96 mg m -3 . The diatom community was dominated by single-cell and small (d = 5-10 µm) centric diatoms under the unaltered flow conditions. Under the altered flow conditions, chain-forming freshwater planktonic diatoms and singe-cell pennatae diatoms dominated the diatom community. The concentrations of dissolved silica varied between 51 and 121 µmol dm -3 and of biogenic silica from 1 to 12 µmol dm -3 . In both cases the lowest values were observed during summer months. Furthermore, dissolved and biogenic silica concentrations were higher at stations representing unaltered flow conditions in comparison to those representing altered flow conditions during summer.

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Section: Study Sitementioning

confidence: 99%