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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 7 | PAGES 1159-1166 | 1996
© Oxford University Press


research-article

Persistence and genetic diversity among strains of phycoerythrinrich cyanobacteria from the picoplankton of Lake Constance

Christine Postius1, Anneliese Ernst1,3, Ulrich Kenter2 and Peter Böger1

1Lehrstuhl für Physiologie und Biochemie der Pflanzen, Universität Konstanz D-78434 Konstanz, FRG 2Limnologisches Institut der Universität Konstanz D-78434 Konstanz, FRG

3To whom correspondence should be addressed

Received on November 20, 1995; accepted on February 2, 1996 Twelve strains of phycoerythrin (PE)-rich unicellular cyanobacteria of the Synechococcus type were isolated from the pelagial of Lake Constance in different phases during the growth period of the year 1994. By analysing the restriction fragment length polymorphism (RFLP) of the DNA three new genotypes were distinguished. The persistence of one strain during the course of the year was demonstrated. The data set was compared with the RFLP observed in PE-rich Synechococcus strains isolated in former years from the same sampling site. The plurality in the picoplanktic isolates and the possibility of cultivation of strains is discussed with respect to the oligotrophication of Lake Constance.


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