B. Papp szerk.: Studia Botanica Hungarica 32. 2001 (Budapest, 2001)

Buczkó, Krisztina; Rajczy, Miklós: Changes of attached diatoms in a dead arm of the Danube between 1992-1999 at Ásványráró (Szigetköz section)

Reed periphyton Altogether 89 taxa were found in the 13 samples collected from reed. Achnanthes minutissima and the Centrales group occurred in all samples. Amphora pediculus and Cocconeis placentula were also frequent, they were absent only in 1 sample. The constancy of Cymbella affinis and Navicula veneta was also 5. Twelve taxa had constancy 2, and 58 taxa had constancy 1 (15 taxa occurred only in two samples, and the occurrence of 43 taxa was sporadic). The result of the cluster analysis shows the separation of the samples collected in 1999 from the others. The dendrogram (Fig. 4) indicates that the Fig. 3. Biplot of PCA analysis, the arrangement of the sampling points and species along the 2nd and 3rd axis.