Sonntag B, Frantal D, Kammerlander B, Darienko T, Filker S, Stoeck T, Gruber M, Pröschold T (2022) Widespread occurrence of two planktonic ciliate species (Urotricha, Prostomatida) originating from high mountain lakes. Diversity 14, 362
Frantal D, Agatha S, Beisser D, Boenigk J, Darienko T, Dirren-Pitsch G, Filker S, Gruber M, Kammerlander B, Nachbaur L, Scheffel U, Stoeck T, Qian K, Weißenbacher B, Pröschold T, Sonntag B (2022) Molecular data reveal a cryptic diversity in the genus Urotricha (Alveolata, Ciliophora, Prostomatida), a key player in freshwater lakes, with remarks on morphology, food preferences, and distribution. Frontiers in Microbiology 12, 787290
Pröschold T, Rieser D, Darienko T, Nachbaur L, Kammerlander B, Qian K, Pitsch G, Bruni EP, Qu Z, Forster D, Rad-Menendez C, Posch T, Stoeck T, Sonntag B (2021) An integrative approach sheds new light onto the systematics and ecology of the widespread ciliate genus Coleps (Ciliophora, Prostomatea). Scientific Reports 11, 5916
Forster D, Qu Z, Pitsch G, Bruni EP, Kammerlander B, Pröschold T, Sonntag B, Posch T, Stoeck T (2021) Lake ecosystem robustness and resilience inferred from a climate-stressed protistan plankton network. Microorganisms 2021, 9, 549
Qu Z, Forster D, Bruni EP, Frantal D, Kammerlander B, Nachbaur L, Pitsch G, Posch T, Pröschold T, Teubner K, Sonntag B, Stoeck T (2021) Aquatic food webs in deep temperate lakes: key species establish through their autecological versatility. Molecular Ecology Molecular Ecology. 2021;30:1053–1071
Sonntag B, Sommaruga R (2020) Effectivness of photoprotective strategies in three mixotrophic planktonic ciliate species. Diversity 12:252
Spanner C, Darienko T, Biehler T, Sonntag B, Pröschold T (2020) Endosymbiotic green algae in Paramecium bursaria: a new isolation method and a simple diagnostic PCR approach for the identification. Diversity 12:240
Flemming FE, Potekhin A, Pröschold T, Schrallhammer M (2020) Algal diversity in Paramecium bursaria: species identification, detection of Choricystis parasitica, and assessment of the interaction specificity. Diversity 12:287
Pröschold T, Pitsch G, Darienko T (2020) Micractinium tetrahymenae (Trebouxiophyceae, Chlorophyta), a new endosymbiont isolated from ciliates. Diversity 12:200
Darienko T, Rad-Menendez L, Campbell C, Pröschold T (2019) Are there any true marine Chlorella species? Molecular phylogenetic assessment and ecology of marine Chlorella-like organisms, including a description of Droopiella gen. nov. Systematics and Biodiversity 17:811-829
Pitsch G, Bruni EP, Forster D, Qu Z, Sonntag B, Stoeck T, Posch T (2019) Seasonality of planktonic freshwater ciliates: are analyses based on V9 regions of the 18S rRNA gene correlated with morphospecies counts? Frontiers in Microbiology: Aquatic Microbiology 10:248
Kammerlander B, Tartarotti B, Sonntag B (2018) The impact of UV radiation on Paramecium populations from alpine lakes. Journal of Eukaryotic Microbiology 65:250-254
Sonntag B, Kammerlander B, Summerer M (2017) Bioaccumulation of ultraviolet sunscreen compounds (mycosporine-like amino acids) by the heterotrophic freshwater ciliate Bursaridium living in alpine lakes. Inland Waters 7:55-64
Schabetsberger R, Sichrowsky U, Scheck A, Schagerl M, Mähnert B, Sonntag B, Pall K (2017) First limnological characterization of the crater-lake Billy Mitchell (Bougainville Island, Papua New Guinea). Pacific Science 71:29 – 45
Kammerlander B, Koinig KA, Rott E, Sommaruga R, Tartarotti B, Trattner F, Sonntag B (2016) Ciliate community structure and interactions within the planktonic food web in two alpine lakes of contrasting transparency. Freshwater Biology 61:1950-1965
Slaveykova V, Sonntag B, Gutiérrez JC (2016) Stress and protists: no life without stress. European Journal of Protistology 55:39-49
Weisse T, Sonntag B (2016) Ciliates in planktonic food webs: communication and adaptive response. In: Witzany G. & Nowacki M (eds), Biocommunication of ciliates. Springer, Berlin, pp. 351-372
Dunthorn M, Lipps JH, Dolan JR, Abboud-Abi Saab M, Aescht E, Bachy C, Barría de Cao MS, Berger H, Bourland WA, Choi JK, Clamp J, Doherty M, Gao F, Gentekaki E, Gong J, Hu X, Huang J, Kamiyama T, Johnson MD, Kammerlander B, Kim SY, Kim Y-O, la Terza A, Laval-Peuto M, Lipscomb D, Lobban CS, Long H, Luporini P, Lynn DH, Macek M, Mansergh RI, Martín-Cereceda M, McManus GG, Montagnes DJS, Ong’ondo GO, Patterson DJ, Pérez-Uz B, Quintela-Alonso P, Safi LSL, Santoferrara LF, Sonntag B, Song W, Stoeck T, Stoecker DK, Strüder-Kypke MC, Trautmann I, Utz LRP, Vallesi A, Vd’ačný P, Warren A, Weisse T, Wickham SA, Yi Z, Zhang W, Zhan Z, Zufall R, Agatha S (2015) Ciliates – protists with complex morphologies and ambiguous early fossil record. Marine Micropaleontology 119:1-6
Kammerlander B, Breiner H-W, Filker S, Sommaruga R, Sonntag B, Stoeck T (2015) High diversity of protistan plankton communities in remote high mountain lakes in the European Alps and the Himalaya mountains. FEMS Microbiology Ecology 91:fiv010
Sichrowsky U, Schabetsberger R, Pall K, Sonntag B, Stoyneva M, Kalfatak D, Økland F, Scheck A, Tambets M (2015) Limnological characterization of the largest freshwater lake in remote Oceania (Lake Letas, Gaua Island, Vanuatu). Pacific Science 69:165-180
Sichrowsky U, Schabetsberger R, Sonntag B, Stoyneva M, Maloney AE, Nelson DB, Richey JN, Sachs JP (2014) Limnological characterization of volcanic crater lakes on Uvea Island (Wallis and Futuna, South Pacific). Pacific Science 68:333-343
Stoeck T, Breiner H-W, Filker S, Ostermaier V, Kammerlander B, Sonntag B (2014) A morpho-genetic survey on ciliate plankton from a mountain lake pinpoints the necessity of lineage-specific barcode markers in microbial ecology. Environmental Microbiology 16:430-444
Ong’ondo GO, Yasindi AW, Oduor SO, Jost S, Schagerl M, Sonntag B, Boenigk J (2013) Ecology and community structure of ciliated protists in two alkaline-saline Rift Valley lakes in Kenya with special emphasis on Frontonia. Journal of Plankton Research 35: 759-771
Sonntag B, Summerer M, Sommaruga R (2011) Are freshwater mixotrophic ciliates less sensitive to solar UV radiation than heterotrophic ones? Journal of Eukaryotic Microbiology 58: 196-202
Sonntag B, Summerer M, Sommaruga R (2011) Factors involved in the distribution pattern of ciliates in the water column of a transparent alpine lake. Journal of Plankton Research 33: 541-546
Sommaruga R, Sonntag B (2009) Photobiological aspects of the mutualistic association between Paramecium bursaria and Chlorella. In: Endosymbionts of Paramecium (M Fujishima, Ed.), Microbiology Monographs 12, Springer Verlag, Berlin, Germany, 111-130
Summerer M, Sonntag B, Hörtnagl P, Sommaruga R (2009) Symbiotic ciliates receive protection against UV damage from their algae: A test with Paramecium bursaria and Chlorella. Protist 160: 233-243
Sonntag B, Strüder-Kypke MC, Summerer M (2008) Uroleptus willii nov. sp., a euplanktonic freshwater ciliate (Dorsomarginalia, Spirotrichea, Ciliophora) with algal symbionts: morphological description including phylogenetic data of the small subunit rRNA gene sequence and ecological notes. Denisia 23: 279-288
Summerer M, Sonntag B, Sommaruga R (2008) Ciliate-symbiont specificity of freshwater endosymbiotic Chlorella (Trebouxiophyceae, Chlorophyta). Journal of Phycology 44: 77-87
Sterr B, Sommaruga R (2008) Does ultraviolet radiation alter kairomones? An experimental test with Chaoborus obscuripes and Daphnia pulex. Journal of Plankton Research 30: 1343-1350
Sonntag B, Summerer M, Sommaruga R (2007) Sources of mycosporine-like amino acids in planktonic Chlorella-bearing ciliates (Ciliophora). Freshwater Biology 52: 1476-1485
Summerer M, Sonntag B, Sommaruga R (2007) An experimental test of the symbiosis specificity between the ciliate Paramecium bursaria and strains of the unicellular green alga Chlorella. Environmental Microbiology 9: 2117-2122
Posch T, Mindl B, Horňák K, Jezbera J, Salcher MM, Sattler B, Sonntag B, Vrba J, Šimek K (2007) Biomass reallocation within freshwater bacterioplankton induced by manipulating phosphorous availability and grazing. Aquatic Microbial Ecology 49: 223-232
Salcher MM, Hofer J, Horňák K, Jezbera J, Sonntag B, Vrba J, Šimek K, Posch T (2007) Modulation of microbial predator-prey dynamics by phosphorous availability. Part II: Growth patterns and survival strategies of bacterial phylogenetic clades. FEMS Microbiology Ecology 60: 40-50
Sonntag B, Posch T, Klammer S, Teubner K, Psenner R (2006) Phagotrophic ciliates and flagellates in an oligotrophic deep alpine lake: contrasting variability with seasons and depths. Aquatic Microbial Ecology 43: 193-207
Pérez P, Libkind D, Diéguez MdC, Summerer M, Sonntag B, Sommaruga R, van Broock M, Zagarese HE (2006) Mycosporines from freshwater yeasts: a trophic cul-de-sac? Photochemical and Photobiological Sciences 5: 25-30
Rott E, Füreder L, Schütz C, Sonntag B, Wille A (2006) Species coexistence in contrast to competition – first evidence from biota within an extreme stream microhabitat. Proceedings of the International Association of Theoretical and Applied Limnology (SIL) 29: 2321-2323
Mindl B, Sonntag B, Pernthaler J, Vrba J, Psenner R, Posch T (2005) Effects of phosphorus loading on interactions of algae and bacteria: reinvestigation of the „phytoplankton-bacteria paradox“ in a continuous cultivation system. Aquatic Microbial Ecology 38: 203-213
Sonntag B, Foissner W (2004) Urotricha psenneri n. sp. and Amphileptus piger (Vuxanovici, 1962) n. comb., two planktonic ciliates (Protozoa, Ciliophora) from an oligotrophic lake in Austria. Journal of Eukaryotic Microbiology 51: 670-677
Sonntag B, Posch T, Klammer S, Griebler C, Psenner R (2002) Protozooplankton in the deep oligotrophic Traunsee (Austria) influenced by discharges of soda and salt industries. Water, Air, and Soil Pollution: Focus 2: 211-226
Griebler C, Sonntag B, Mindl B, Posch T, Klammer S, Psenner R (2002) Assessment of the ecological integrity of Traunsee (Austria) via analysis of sediments and benthic microbial communities. Water, Air, and Soil Pollution: Focus 2: 33-62
Klammer S, Posch T, Sonntag B, Griebler C, Mindl B, Psenner R (2002) Dynamics of bacterial abundance, biomass, activity, and community composition in the oligotrophic Traunsee and the Traun River (Austria). Water, Air, and Soil Pollution: Focus 2: 137-163
Posch T, Jezbera J, Vrba J, Šimek K, Pernthaler J Andreatta S, Sonntag B (2001) Size selective feeding in Cyclidium glaucoma (Ciliophora, Scuticociliatida) and its effects on bacterial community structure: a study from a continuous cultivation system. Microbial Ecology 42: 217-227
Sonntag B, Posch T, Psenner R (2000) Comparison of three methods for determining flagellate abundance, cell size, and biovolume in cultures and natural freshwater samples. Archiv für Hydrobiologie 149: 337-351
Wille A, Sonntag B, Sattler B, Psenner R (1999) Abundance, biomass and size structure of the microbial assemblage in the high mountain lake Gossenköllesee (Tyrol, Austria) during the ice-free period. Journal of Limnology 58: 117-126
Posch T, Šimek K, Vrba J, Pernthaler J, Nedoma J, Sattler B, Sonntag B, Psenner R (1999) Predator-induced changes of bacterial size-structure and productivity studied on an experimental microbial community. Aquatic Microbial Ecology 18: 235-246
Pfister G, Sonntag B, Posch T (1999) Comparison of a direct live count and an improved quantitative protargol stain (QPS) in determining abundance and cell volumes of pelagic freshwater protozoa. Aquatic Microbial Ecology 18: 95-103
