Thomas Posch
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View article: Bringing the uncultivated microbial majority of freshwater ecosystems into culture
Bringing the uncultivated microbial majority of freshwater ecosystems into culture Open
Axenic cultures are essential for studying microbial ecology, evolution, and genomics. Despite the importance of pure cultures, public culture collections are biased towards fast-growing copiotrophs, while many abundant aquatic prokaryotes…
View article: Bringing the uncultivated microbial majority of freshwater ecosystems into culture
Bringing the uncultivated microbial majority of freshwater ecosystems into culture Open
Axenic cultures are essential for studying microbial ecology, evolution, and genomics. Despite the importance of pure cultures, public culture collections are biased towards fast-growing copiotrophs, while many abundant aquatic prokaryotes…
View article: An early evolutionary stage of mutualistic endosymbiosis reveals a parasitic aspect of endosymbionts
An early evolutionary stage of mutualistic endosymbiosis reveals a parasitic aspect of endosymbionts Open
Mutualistic endosymbiosis is a cornerstone of evolutionary innovation, enabling organisms to exploit diverse niches unavailable to individual species. However, our knowledge about the early evolutionary stage of this relationship remains l…
View article: Environment-dependent mutualism–parasitism transitions in the incipient symbiosis between <i>Tetrahymena utriculariae</i> and <i>Micractinium tetrahymenae</i>
Environment-dependent mutualism–parasitism transitions in the incipient symbiosis between <i>Tetrahymena utriculariae</i> and <i>Micractinium tetrahymenae</i> Open
Mutualistic endosymbiosis is a cornerstone of evolutionary innovation, enabling organisms to exploit diverse niches unavailable to individual species. However, our knowledge about the early evolutionary stage of this relationship remains l…
View article: The planktonic freshwater ciliate <i>Balanion planctonicum</i> (Ciliophora, Prostomatea): A cryptic species complex or a “complex species”?
The planktonic freshwater ciliate <i>Balanion planctonicum</i> (Ciliophora, Prostomatea): A cryptic species complex or a “complex species”? Open
The globally distributed ciliate Balanion planctonicum is a primary consumer of phytoplankton spring blooms. Due to its small size (~20 μm), identification and quantification by molecular tools is preferable as an alternative to the labori…
View article: The GRAZ Method—Determination of Urban Surface Temperatures from Aerial Thermography Based on a Three-Dimensional Sampling Algorithm
The GRAZ Method—Determination of Urban Surface Temperatures from Aerial Thermography Based on a Three-Dimensional Sampling Algorithm Open
A novel method to derive surface temperatures from aerial thermography is proposed. Its theoretical foundation, details regarding the implementation, relevant sensitivities, and its application on a day and night survey are presented here.…
View article: Variability of winter cooling affects intensity of phytoplankton spring blooms – how resilient is the ciliate assemblage composition to changes in food availability?
Variability of winter cooling affects intensity of phytoplankton spring blooms – how resilient is the ciliate assemblage composition to changes in food availability? Open
After years of partial winter mixing in Lake Zurich (Switzerland), a complete turnover of the water column reoccurred during winter/spring 2021. It was favored by a cold, windy winter and a small difference of water temperatures between th…
View article: Global freshwater distribution of <i>Telonemia</i> protists
Global freshwater distribution of <i>Telonemia</i> protists Open
Telonemia are one of the oldest identified marine protists that for most part of their history have been recognized as a distinct incertae sedis lineage. Today, their evolutionary proximity to the SAR supergroup (Stramenopiles, Alveolates,…
View article: FISHing for ciliates: Catalyzed reporter deposition fluorescence in situ hybridization for the detection of planktonic freshwater ciliates
FISHing for ciliates: Catalyzed reporter deposition fluorescence in situ hybridization for the detection of planktonic freshwater ciliates Open
Planktonic ciliate species form multiple trophic guilds and are central components of freshwater food webs. Progress in molecular analytical tools has opened new insight into ciliate assemblages. However, high and variable 18S rDNA copy nu…
View article: The Red Harmful Plague in Times of Climate Change: Blooms of the Cyanobacterium Planktothrix rubescens Triggered by Stratification Dynamics and Irradiance
The Red Harmful Plague in Times of Climate Change: Blooms of the Cyanobacterium Planktothrix rubescens Triggered by Stratification Dynamics and Irradiance Open
Planktothrix rubescens is a harmful planktonic cyanobacterium, forming concentrated metalimnetic populations in deep oligo- and mesotrophic lakes, even after successful restoration. In Lake Zurich (Switzerland), P. rubescens emerged as a k…
View article: Lake Ecosystem Robustness and Resilience Inferred from a Climate-Stressed Protistan Plankton Network
Lake Ecosystem Robustness and Resilience Inferred from a Climate-Stressed Protistan Plankton Network Open
Network analyses of biological communities allow for identifying potential consequences of climate change on the resilience of ecosystems and their robustness to resist stressors. Using DNA metabarcoding datasets from a three-year-sampling…
View article: Aquatic food webs in deep temperate lakes: Key species establish through their autecological versatility
Aquatic food webs in deep temperate lakes: Key species establish through their autecological versatility Open
Microbial planktonic communities are the basis of food webs in aquatic ecosystems since they contribute substantially to primary production and nutrient recycling. Network analyses of DNA metabarcoding data sets emerged as a powerful tool …
View article: Cascading effects in freshwater microbial food webs by predatory Cercozoa, Katablepharidacea and ciliates feeding on aplastidic bacterivorous cryptophytes
Cascading effects in freshwater microbial food webs by predatory Cercozoa, Katablepharidacea and ciliates feeding on aplastidic bacterivorous cryptophytes Open
Heterotrophic nanoflagellates (HNF) are considered as major planktonic bacterivores, however, larger HNF taxa can also be important predators of eukaryotes. To examine this trophic cascading, natural protistan communities from a freshwater…
View article: Bacterial and Eukaryotic Small-Subunit Amplicon Data Do Not Provide a Quantitative Picture of Microbial Communities, but They Are Reliable in the Context of Ecological Interpretations
Bacterial and Eukaryotic Small-Subunit Amplicon Data Do Not Provide a Quantitative Picture of Microbial Communities, but They Are Reliable in the Context of Ecological Interpretations Open
High-throughput sequencing (HTS) of amplified fragments of rRNA genes provides unprecedented insight into the diversity of prokaryotic and eukaryotic microorganisms. Unfortunately, HTS data are prone to quantitative biases, which may lead …
View article: Circalunar variations of the night sky brightness – an FFT perspective on the impact of light pollution
Circalunar variations of the night sky brightness – an FFT perspective on the impact of light pollution Open
Circa-monthly activity conducted by moonlight is observed in many species on Earth. Given the vast amount of artificial light at night (ALAN) that pollutes large areas around the globe, the synchronization to the circalunar cycle is often …
View article: Microbial food webs in hypertrophic fishponds: Omnivorous ciliate taxa are major protistan bacterivores
Microbial food webs in hypertrophic fishponds: Omnivorous ciliate taxa are major protistan bacterivores Open
Despite the importance of shallow lakes worldwide, knowledge of microbial components, the base of their food webs, remains scarce. To close this gap, we investigated planktonic microbial food webs, in particular protistan bacterivory (for …
View article: Quantifying circalunar periodicity, long-term trends and seasonal variations in the night sky brightness based on the Austrian SQM network
Quantifying circalunar periodicity, long-term trends and seasonal variations in the night sky brightness based on the Austrian SQM network Open
Based on the paper by Posch, Binder & Puschnig (JQSRT 211, 144), we extend the study of the night sky brightness (henceforth: NSB) at 26 locations in Eastern Austria in time and complement it by a new method to quantify the amplitude of th…
View article: Seasonality of Planktonic Freshwater Ciliates: Are Analyses Based on V9 Regions of the 18S rRNA Gene Correlated With Morphospecies Counts?
Seasonality of Planktonic Freshwater Ciliates: Are Analyses Based on V9 Regions of the 18S rRNA Gene Correlated With Morphospecies Counts? Open
Ciliates represent central nodes in freshwater planktonic food webs, and many species show pronounced seasonality, with short-lived maxima of a few dominant taxa while many being rare or ephemeral. These observations are primarily based on…
View article: Additional file 2: of Hunters or farmers? Microbiome characteristics help elucidate the diet composition in an aquatic carnivorous plant
Additional file 2: of Hunters or farmers? Microbiome characteristics help elucidate the diet composition in an aquatic carnivorous plant Open
Table S5. a Prokaryotic OTUs distribution in samples. b Methanotropic OTUs distribution in samples (external file). c Fungal OTUs distribution in samples. (XLSX 930 kb)
View article: Additional file 3: of Hunters or farmers? Microbiome characteristics help elucidate the diet composition in an aquatic carnivorous plant
Additional file 3: of Hunters or farmers? Microbiome characteristics help elucidate the diet composition in an aquatic carnivorous plant Open
Table S6. Summary of metatranscriptomic analyses. (XLSX 1461 kb)
View article: Hunters or gardeners? Linking community structure and function of trap-associated microbes to the nutrient acquisition strategy of a carnivorous plant
Hunters or gardeners? Linking community structure and function of trap-associated microbes to the nutrient acquisition strategy of a carnivorous plant Open
All higher eukaryotes live in a relationship with diverse microorganisms which colonize their bodily surfaces; plants are no exception. However, we still lack a satisfactory understanding of how these loosely associated microbiomes with im…