Aerobic anoxygenic phototrophs are highly abundant in hypertrophic and polyhumic waters

Nóra Szabó-Tugyi, Lajos Vörös, Katalin Balogh, Zoltán Botta-Dukát, Gábor Bernát, Dénes Schmera, Boglárka Somogyi

Research output: Contribution to journalArticle

Abstract

Aerobic anoxygenic phototrophs (AAPs) are a group of photoheterotrophic bacteria common in natural waters. Here, AAP abundance and contribution to total bacterial abundance and biomass were investigated to test whether the trophic status of a lake or content of coloured dissolved organic matter (CDOM) play a role in determining AAP distribution and abundance in shallow inland lakes, with special focus on hypertrophic and polyhumic waters. Twenty-six different shallow lakes in Hungary were monitored. AAP abundance and biomass were determined by epifluorescence microscopy. The lakes exhibit a broad range of CDOM (2-7000 mg Pt L-1) and phytoplankton biomass (2-1200 μg L-1 chlorophyll a concentration). Very high AAP abundance (up to 3 × 107 cells mL-1) was observed in polyhumic and hypertrophic shallow lakes. AAP abundance was influenced by phytoplankton biomass and CDOM content, and these effects were interrelated. As determined, 40 μg L-1 chlorophyll a and 52 mg Pt L-1 CDOM are threshold levels above which these effects have a synergistic relationship. Hence, the observed high AAP abundance in some soda pans is a consequence of combined hypertrophy and high CDOM content. AAP contribution was influenced by total suspended solids (TSS) content: the success of AAP cells could be explained by high TSS levels, which might be explained by the decrease of their selective grazing control.

Original languageEnglish
Article numberfiz104
JournalFEMS microbiology ecology
Volume95
Issue number8
DOIs
Publication statusPublished - Jan 1 2019

Keywords

  • abundance
  • aerobic anoxygenic phototroph
  • chlorophyll a
  • coloured dissolved organic matter
  • heterotrophic bacterium
  • shallow lake

ASJC Scopus subject areas

  • Microbiology
  • Ecology
  • Applied Microbiology and Biotechnology

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