Cryptophyta as major bacterivores in freshwater summer plankton

0495058 - BC 2019 RIV GB eng J - Journal Article
Grujčič, Vesna - Nuy, J.K. - Salcher, Michaela M. - Shabarova, Tatiana - Kasalický, Vojtěch - Boenigk, J. - Jensen, M. - Šimek, Karel
Cryptophyta as major bacterivores in freshwater summer plankton.
The ISME Journal. Roč. 12, č. 7 (2018), s. 1668-1681. ISSN 1751-7362. E-ISSN 1751-7370
R&D Projects: GA ČR(CZ) GA13-00243S
Institutional support: RVO:60077344
Keywords : in-situ hybridization * ribosomal-rna genes * community composition * protist diversity * functional diversity
OECD category: Microbiology
Impact factor: 9.493, year: 2018

Small bacterivorous eukaryotes play a cardinal role in aquatic food webs and their taxonomic classification is currently a hot topic in aquatic microbial ecology. Despite increasing interest in their diversity, core questions regarding predator-prey specificity remain largely unanswered, e.g., which heterotrophic nanoflagellates (HNFs) are the main bacterivores in freshwaters and which prokaryotes support the growth of small HNFs. To answer these questions, we fed natural communities of HNFs from Rimov reservoir (Czech Republic) with five different bacterial strains of the ubiquitous betaproteobacterial genera Polynucleobacter and Limnohabitans. We combined amplicon sequencing and catalyzed reporter deposition fluorescence in situ hybridization (CARD-FISH) targeting eukaryotic 18 S rRNA genes to track specific responses of the natural HNF community to prey amendments. While amplicon sequencing provided valuable qualitative data and a basis for designing specific probes, the number of reads was insufficient to accurately quantify certain eukaryotic groups. We also applied a double-hybridization technique that allows simultaneous phylogenetic identification of both predator and prey. Our results show that community composition of HNFs is strongly dependent upon prey type. Surprisingly, Cryptophyta were the most abundant bacterivores, although this phylum has been so far assumed to be mainly autotrophic. Moreover, the growth of a small lineage of Cryptophyta (CRY1 clade) was strongly stimulated by one Limnohabitans strain in our experiment. Thus, our study is the first report that colorless Cryptophyta are major bacterivores in summer plankton samples and can play a key role in the carbon transfer from prokaryotes to higher trophic levels.
Permanent Link: http://hdl.handle.net/11104/0288083