Acta Botanica Croatica, Vol. 30 No. 1, 1971.
Original scientific paper
The Littoral Microphytic Vegetation of Lake Ohrid
Ivan Čado
; Hrvatska
Abstract
Under the modified Mediterranean climatic conditions, the predominant calcareous structure of the massifs of the Lake basin and the features of the shore with its numerous karstic, surface and sublacustrine sources, a littoral zone in the classic manner has been differentiated in Lake Ohrid with its more characteristic facies: residue facies, sandy-shore facies, pebble-stone and stone facies, and rock facies. The residue facies, as compared to the stone and rock facies, are spread along the shortest length of the lake shore.
The most numerous within the lithophytic association are the representatives of the following groups: Cyanophyta, Bacillariophyceae, Chlorophyta, Rhodophyta, Bryophyta, Lichenes and Bacteria, primarily the forms of a wide ecological range, namely, forms that can endure frequent thermic excesses, long spells of dry weather, intensive insolation etc.
The lithophytic vegetation in the littoral zone of Lake Ohrid is of a stratified disposition. On the basis of allocation of vegetation and the specific features of ecological factors at the vertical section of the littoral belt of the lake, we can differentiate the following zones: supralittoral, eulittoral and infralittoral. This classification is of a regional character and is to be expected in lakes with a similar complex of abiotic and biotic factors and within an approximately similar framework.
By the characteristic forms that leave a particular stamp of vegetation, the supralittoral could be defined as the Gloeocapsa — Scytonema zone, the eulittoral as the Microcoleus — Schizothrix — Rivularia zone on the one hand and as the Bangia — Cladophora zone on the other. The infralittoral, where we can distinguish an upper and a lower belt, is characterised by an increased number of floral forms and by an increased quotient in relation to Cyanophyta and other groups of water plants.
Keywords
Hrčak ID:
156609
URI
Publication date:
31.12.1971.
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