Harmful filamentous cyanobacteria favoured by reduced water turnover with lake warming
Evidence is presented that climate change-induced lake warming may cause the same undesired effects as have formerly emerged from excess nutrients (eutrophication) as well as unidirectional lake-restoration measures in parallel with recurrent absence of holomixis owing to lake warming.
Microdiversification in genome-streamlined ubiquitous freshwater Actinobacteria
- S. Neuenschwander, R. Ghai, J. Pernthaler, M. Salcher
- Biology, Environmental ScienceThe ISME Journal
- 13 October 2017
A new order within Actinobacteria is proposed (‘Candidatus Nanopelagicales’) with two new genera and nine new species and a surprising degree of inter- and intraspecific diversity in metabolic pathways, especially of carbohydrate transport and metabolism, and mainly encoded in genomic islands.
The ecology of pelagic freshwater methylotrophs assessed by a high-resolution monitoring and isolation campaign
- M. Salcher, S. Neuenschwander, T. Posch, J. Pernthaler
- Environmental Science, BiologyThe ISME Journal
- 5 May 2015
Two planktonic freshwater lineages affiliated with Methylophilaceae in Lake Zurich, Switzerland, are studied by a combination of molecular and cultivation-based approaches to propose a new genus with two species, ‘Candidatus Methylopumilus planktonicus’ (LD28) and ‘PRD01a001B“, which confirmed a methylotrophic lifestyle with a reduced set of genes involved in C1 metabolism.
Same same but different: ecological niche partitioning of planktonic freshwater prokaryotes
- M. Salcher
- Environmental Science
- 26 August 2013
This review gives an overview of the most abundant prokaryotic populations by grouping them in specific ecological guilds based on their life strategies, reflected in a distinct seasonality of the freshwater bacterioplankton.
Spatio-temporal niche separation of planktonic Betaproteobacteria in an oligo-mesotrophic lake.
- M. Salcher, J. Pernthaler, M. Zeder, R. Psenner, T. Posch
- Environmental Science, BiologyEnvironmental Microbiology
- 1 August 2008
In general, only moderate seasonal changes in abundance were observed in the upper water layers, whereas there was a clear relationship between decreasing oxygen levels and the rise of bacteria from the PnecC and beta IV clades in deeper strata.
Seasonal bloom dynamics and ecophysiology of the freshwater sister clade of SAR11 bacteria ‘that rule the waves’ (LD12)
LD12 bacteria do not only share phenotypic and metabolic traits with Pelagibacter, but also seem to thrive in the analogous spatiotemporal niche in freshwaters.
Spatiotemporal distribution and activity patterns of bacteria from three phylogenetic groups in an oligomesotrophic lake
The contrasting vertical and seasonal patterns suggest that the three phylogenetic groups to some extent represent different functional compartments of the bacterioplankton in an oligomesotrophic alpine lake.
Rapid successions affect microbial N-acetyl-glucosamine uptake patterns during a lacustrine spring phytoplankton bloom.
- Ester M. Eckert, M. Salcher, T. Posch, Bettina Eugster, J. Pernthaler
- Environmental ScienceEnvironmental Microbiology
- 1 March 2012
While 'opportunistically' growing BET and CF dominated NAG uptake in the initial period ruled by bottom-up factors, ACT constituted the major fraction of NAG active cells during the subsequent phase of high predation pressure, indicating that some ACT could profit from a substrate that might in parts have originated from the grazing of protists on their bacterial competitors.
Vertical and longitudinal distribution patterns of different bacterioplankton populations in a canyon‐shaped, deep prealpine lake
This work studied the spatial distribution patterns of different heterotrophic bacteria, picocyanobacteria, and the dominant primary producer, the filamentous cyanobacterium Planktothrix rubescens, in a large, canyon-shaped, prealpine lake in six vertical profiles along a 21-km longitudinal transect to stress the potential importance of spatial niche differentiation in freshwater bacterioplankton.
Modulation of microbial predator-prey dynamics by phosphorus availability: growth patterns and survival strategies of bacterial phylogenetic clades.
- M. Salcher, Julia S. Hofer, T. Posch
- Biology, Environmental ScienceFEMS Microbiology Ecology
- 1 April 2007
By combining several single-cell methods, new insight is gained into the competitive abilities of freshwater bacteria from a variety of phylogenetic lineages under contrasting sets of bottom-up and top-down constraints.