High turnover rates of aerobic anoxygenic phototrophs in European freshwater lakes

0469707 - MBÚ 2017 RIV GB eng J - Journal Article
Cepáková, Zuzana - Hrouzek, Pavel - Žišková, Eva - Nuyanzina-Boldareva, Ekaterina - Šorf, M. - Kozlíková-Zapomělová, Eliška - Salka, I. - Grossart, H. P. - Koblížek, Michal
High turnover rates of aerobic anoxygenic phototrophs in European freshwater lakes.
Environmental Microbiology. Roč. 18, č. 12 (2016), s. 5063-5071. ISSN 1462-2912. E-ISSN 1462-2920
R&D Projects: GA MŠMT(CZ) LO1416; GA ČR GA13-11281S
Institutional support: RVO:61388971 ; RVO:60077344
Keywords : Aerobic Anoxygenic Phototrophic bacteria * bacteriochlorophyll (BChl) * AAP bacteria
Subject RIV: EE - Microbiology, Virology
Impact factor: 5.395, year: 2016

Aerobic Anoxygenic Phototrophic (AAP) bacteria are bacteriochlorophyll (BChl) a -containing organisms which use light energy to supplement their predominantly heterotrophic metabolism. Here, we investigated mortality and growth rates of AAP bacteria in three different freshwater lakes in Central Europe: the mountain lake Plešné, the oligo-mesotrophic Lake Stechlin and the forest pond Huntov. The mortality of AAP bacteria was estimated from diel changes of BChl a fluorescence. Net and gross growth rates were calculated from the increases in AAP cell numbers. The gross growth rates of AAP bacteria ranged from 0.38 to 5.6 d−1, with the highest values observed during summer months. Simultaneously, the rapidly growing AAP cells have to cope with an intense grazing pressure by both zooplankton and protists. The presented results document that during the day, gross growth usually surpased mortality. Our results indicate that AAP bacteria utilize light energy under natural conditions to maintain rapid growth rates, which are balanced by a generally intense grazing pressure.
Permanent Link: http://hdl.handle.net/11104/0268282