Adaptive succesional changes in malacocoenoses as reaction to the changed hydrological conditions in the diversion area of the Gabcikovo power plant (Slovakia, the Danube river)
1997
Cejka, T. (Slovak Academy of Sciences, Bratislava (Slovak Republic). Inst. of Zoology)
In October 1992 a major part of the flow of the Danube was diverted into the diversion canal of the Gabcikovo power plant. In the area of diversion, since the river was barraged the hydrological regime of the ground water and surface water has been slowly changing, which is a limiting factor for the existence of the primary association of the floodplain forest. During seven years of investigation at the model site it was found that exacting mollusc species of the floodplain forest have been retreating (Aegopinella nitens, Semilimax semilimax), while euryvalent species have been penetrating (Nesovitrea hammonis, Punctum pygmaneum). The density of the forest hygrophilous species (Clausilia pumila, Urticicola umbrosus) as well as the ripicolous species (Carychium minimum, Pseudotrichia rubiginosa, Zonitoides nitidus) has been decreasing, while the open-country species (Vallonia costata, Vallonia pulchella) have been penetrating into observed malacocoenosis. The values of the species identity coefficient between individual years were between 53.8-95.8
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