Effect of hydrological connectivity on the molluscan community structure in oxbow lakes of the Łyna River

• Autorzy: Obolewski K. , Glińska-Lewczuk K. , Kobus S.
• Języki publikacji: EN

Abstrakty

EN

During 2004 and 2005 research on the malacocenoses existing in oxbow lakes differ in terms of hydrological connectivity was conducted in the valley of the Łyna River. The results showed that the connection of an oxbow lake with the river is the key factor influencing the abundance and biomass of molluscs in the lake. Three types of oxbow lakes representing lentic, semi-lotic and lotic environments were considered. In the lentic oxbow lake Mollusca was dominated by Potamapyrgus antipodarum Gray, the semi-lotic by Viviparus viviparus L., and the lotic by Pisidium sp. The most hospitable conditions for the molluscs’ development were found in the semi-lotic reservoir where contact with the river was maintained by backwater in the downstream arm. The separation of the reservoir from the river caused a total reduction of the Bivalvia representatives. Diversity of the malacocenoses resulted mainly from different abilities to adapt to temporary oxygen deficits. Each type of oxbow lake is characterized by an individual pattern of oxygen distribution. To avoid anaerobic conditions and enable the development of biodiversity in floodplains, water bodies should be supplied by well-aerated river water.

Słowa kluczowe

EN

Mollusca; oxbow lakes; Łyna river; hydrological connectivity

• Wydawca: Institute of Oceanography University of Gdańsk
• Czasopismo: Oceanological and Hydrobiological Studies
• Rocznik: 2009
• Tom: Vol. 38, No.4
• Strony: 75--88
• Opis fizyczny: bibliogr. 25 poz., tab., wykr.

Twórcy

autor

Obolewski K.

autor

Glińska-Lewczuk K.

autor

Kobus S.

• 1Department of Water Ecology, Pomeranian Academy ul. Arciszewskiego 22 b, 76-200 Słupsk, Poland,

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