TY  - JOUR
A1  - Eigemann, Falk
A1  - Hilt, Sabine
A1  - Salka, Ivette
A1  - Grossart, Hans-Peter
T1  - Bacterial community composition associated with freshwater algae  species specificity vs. dependency on environmental conditions and source community
T2  - FEMS microbiology ecology
N2  - We studied bacterial associations with the green alga Desmodesmus armatus and the diatom Stephanodiscus minutulus under changing environmental conditions and bacterial source communities, to evaluate whether bacteriaalgae associations are species-specific or more generalized and determined by external factors. Axenic and xenic algae were incubated in situ with and without allelopathically active macrophytes, and in the laboratory with sterile and nonsterile lake water and an allelochemical, tannic acid (TA). Bacterial community composition (BCC) of algae-associated bacteria was analyzed by denaturing gradient gel electrophoresis (DGGE), nonmetric multidimensional scaling, cluster analyses, and sequencing of DGGE bands. BCC of xenic algal cultures of both species were not significantly affected by changes in their environment or bacterial source community, except in the case of TA additions. Species-specific interactions therefore appear to overrule the effects of environmental conditions and source communities. The BCC of xenic and axenic D.armatus cultures subjected to in situ bacterial colonization, however, had lower similarities (ca.55%), indicating that bacterial precolonization is a strong factor for bacteriaalgae associations irrespective of environmental conditions and source community. Our findings emphasize the ecological importance of species-specific bacteriaalgae associations with important repercussions for other processes, such as the remineralization of nutrients, and organic matter dynamics.
KW  - allelopathy
KW  - bacteriaalgae associations
KW  - heterotrophic bacteria
KW  - species-specific
Y1  - 2013
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/35185
SN  - 0168-6496
VL  - 83
IS  - 3
SP  - 650
EP  - 663
PB  - Wiley-Blackwell
CY  - Hoboken
ER  -