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- W387208193 abstract "Species-rich diatom communities were found to occur within colo- nies of the nitrogen-fixing cyanobacterium Rivularia atra Roth in the brackish Bal- tic Sea. These communities have never been reported before. To understand how the special conditions within the cyanobacterial colonies (limited light, presence of host mucilage, chemical excretions by the host) affected diatom community compo- sition, comparisons were made with diatom communities epiphytic on macroalgae sampled from the same stones as the Rivularia colonies. Motile diatoms of the ge- nera Amphora, Berkeleya, Cymbella, Entomoneis, Epithemia, Lunella, Mastogloia, Nitzschia and Rhopalodia dominated the Rivularia-associated communities whe- reas attached diatoms of the genera Achnanthes, Cocconeis, Diatoma, Fragilaria, Gomphonema, Hyalosira, Licmophora, Rhoicosphenia and Tabularia dominated the epiphytic communities on macroalgae. Diatom species richness, Shannon diversity and evenness were all significantly higher in the Rivularia communities. The diatoms probably profit from the symbiosis with Rivularia in several ways: (1) by protection against grazing (2) by protection against physical disturbances, (3) by using cyanobacterial mucilage as a substratum for motility and (4) by excre- tion of inorganic and organic nutrients from Rivularia cells. It is more difficult to identify advantages for Rivularia in this symbiosis, but nutritional advantages may exist for the cyanobacterium as well." @default.
- W387208193 created "2016-06-24" @default.
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- W387208193 date "2004-01-01" @default.
- W387208193 modified "2023-09-27" @default.
- W387208193 title "SYMBIOSIS BETWEEN DIATOMS AND CYANOBACTERIAL COLONIES" @default.
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