Structural Elements. Principal Populations of Algae. Spatial Distribution
The algal flora of a fishpond is generally quite rich, including elements from ecologically different microbiotopes. This holds true especially for the pond littoral ecosystems. In managed fishponds, two distinct zones of the littoral, an outer landward and an inner waterward zone, may be distinguished, both usually differing in the structure of macrophyte communities, in water chemistry as well as in the composition of the algal microvegetation (See Fig. I in Introduction to this Sect. and Fig. 11 in Sect. 2.3). These differences arise and/or are supported by intense long-term management of the fishponds. In the central part of a pond, this management generally creates a biotope differing considerably from the environment in which the fishpond had been set up. Hence it is in the littoral that the ecological pressures of the original and changed environments meet; frequently, a distinct boundary arises between the outer littoral, where the original conditions tend to prevail, and the far more modified inner littoral.
KeywordsFilamentous Alga Phragmites Communis Open Water Surface Chlorococcal Alga Ceratium Hirundinella
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