Effects of Daphnia exudates and sodium octyl sulphates on filament morphology and cell wall thickness of Aphanizomenon gracile (Nostocales), Cylindrospermopsis raciborskii (Nostocales) and Planktothrix agardhii (Oscillatoriales)

Grazing is recognized as one of the selective factors shaping the morphology and physiology of cyanobacteria. A recent study has shown that the filamentous cyanobacterium Aphanizomenon gracile strain SAG 31.79 thickened in the presence of Daphnia (Cladocera) and its exudates. The aims of our study were: (1) to determine whether this type of response to Daphnia cues is common for other strains of A. gracile, and other species of filamentous...