Contribution
Seasonal development of epiphytic algae on Phragmites australis (CAV.) TRIN. ex STEN. in a eutrophic lake
Müller, Ute
Archiv für Hydrobiologie Volume 129 Number 3 (1994), p. 273 - 292
49 références bibliographiques
publié: Jan 25, 1994
DOI: 10.1127/archiv-hydrobiol/129/1994/273
ArtNo. ESP141012903001, Prix: 29.00 €
Abstract
The epiphytic algal community on Phragmites australis was characterized by chlorophyll concentrations and biovolume throughout three annual cycles in the eutrophic Lake Belau (Schleswig-Holstein, Germany). During the investigation period, from November 1988 till October 1991, there were prominent spring maxima in March and April. A second but shorter peak was observed in May 1989 and June 1991. During the summer, the least amount of periphyton biomass was found on the stems. Throughout the year, the diatoms usually accounted for the most biovolume. Only in late spring or early summer, when the PAR (photosynthetic active radiation) was greatest within the Phragmites belt, they were displaced by chlorophytes. Only low volumes of cyanobacteria were present, and this group was never predominant. Adnate bacillariophyceaen and chlorophyceaen species were predominated during fall and winter, and loosely attached species displaced them during the other seasons. Biomass production and algal succession displaced great regularity throughout the three years of the investigation.
Mots-clefs
Phragmites australis • bacillariophyceaen • chlorophyceaen • diatoms • Lake Belau • Schleswig-Holstein • Germany