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A Note on the Variability of the Diatom Cyclotella meneghiniana (KÜTZ.) after Isolation from the Natural Environment
Author(s) -
Benndorf Jürgen,
Egerer Gabriele
Publication year - 1981
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19810660513
Subject(s) - diatom , isolation (microbiology) , strain (injury) , population , botany , natural population growth , biology , phaeodactylum tricornutum , grazing pressure , grazing , ecology , chemistry , microbiology and biotechnology , demography , anatomy , sociology
A pure culture strain of Cyclotella meneghiniana (KÜTZ.) isolated from the hypereutrophic Bautzen reservoir (March 1980) developed from the typical Cyclotella ‐shape to cells with an extremely prolonged pervalvar axis and a small diameter after five months growing under pure culture conditions. This change is interpreted as a consequence of the complete absence of grazing pressure as a selection factor. Since the cell surface/volume ratio showed a singificant increase (3.0) in comparison with the natural population (1.8), it is assumed that the culture strain has also changed with respect to physiological criteria. The conclusion is drawn that investigations of pure cultures for ecological purposes should be restricted to freshly isolated strains.