TY  - JOUR
A1  - Attermeyer, Katrin
A1  - Tittel, Joerg
A1  - Allgaier, Martin
A1  - Frindte, Katharina
A1  - Wurzbacher, Christian
A1  - Hilt, Sabine
A1  - Kamjunke, Norbert
A1  - Grossart, Hans-Peter
T1  - Effects of Light and Autochthonous Carbon Additions on Microbial Turnover of Allochthonous Organic Carbon and Community Composition
JF  - Microbial ecology
N2  - The fate of allochthonous dissolved organic carbon (DOC) in aquatic systems is primarily controlled by the turnover of heterotrophic bacteria. However, the roles that abiotic and biotic factors such as light and DOC release by aquatic primary producers play in the microbial decomposition of allochthonous DOC is not well understood. We therefore tested if light and autochthonous DOC additions would increase allochthonous DOC decomposition rates and change bacterial growth efficiencies and community composition (BCC). We established continuous growth cultures with different inocula of natural bacterial communities and alder leaf leachates (DOCleaf) with and without light exposure before amendment. Furthermore, we incubated DOCleaf together with autochthonous DOC from lysed phytoplankton cultures (DOCphyto). Our results revealed that pretreatments of DOCleaf with light resulted in a doubling of bacterial growth efficiency (BGE), whereas additions of DOCphyto or combined additions of DOCphyto and light had no effect on BGE. The change in BGE was not accompanied by shifts in the phylogenetic structure of the BCC, but BCC was influenced by the DOC source. Our results highlight that a doubling of BGE is not necessarily accompanied by a shift in BCC and that BCC is more strongly affected by resource properties.
KW  - Bacterial growth efficiency
KW  - Continuous cultures
KW  - Carbon decomposition
KW  - Leaf litter
KW  - Photolysis
Y1  - 2015
U6  - https://doi.org/10.1007/s00248-014-0549-4
SN  - 0095-3628
SN  - 1432-184X
VL  - 69
IS  - 2
SP  - 361
EP  - 371
PB  - Springer
CY  - New York
ER  -