Limnetic zooplankton passing through a high-head dam and their fate in a river with high current velocity (Case of the Krasnoyarsk hydroelectric power station on the Yenisey river)

Тип публикации: статья из журнала

Год издания: 2004

Ключевые слова: Copepoda, Heterocope

Аннотация: The vertical distribution of net zooplankton in head-water of Krasnoyarsk hydroelectric power station and its horizontal distribution in the tail-water were studied during two years in winter and summer seasons. In order to distinguish living and dead individuals the special staining was used. It was revealed that on average 77% of living plankton pass through high-head dam with deep water scoop to the tailwater. While passing through dam aggregates some individuals of the reservoir plankton are traumatized and die, that results in some increase of portion of dead individuals in the tail water near dam (from 3 to 6%). Alive zooplankton passed through the dam aggregates is eliminated under the Upper Yenisey highly turbulent conditions. There is approximately 10% of it in 32 km from the dam if compare with biomass in 20-40 m layer of reservoir, the portion of dead increases to 11%. The biomass of zooplankton suspended in the water column of the tail-water sometimes increases (till > 1 g/m3) due to large Copepoda Heterocope borealis, which inhabits near-bottom and near-shore river zones and can be found in the central part of the river during reproductive period. Limnetic zooplankton from the reservoir cannot be considered as important food for planktivores in the tail-water.

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Издание

Журнал: Zhurnal Obshchei Biologii

Выпуск журнала: Vol. 65, Is. 1

Номера страниц: 92-93

ISSN журнала: 00444596

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