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afbeelding van Stefan  Geisen

Dr. Stefan Geisen

Researcher

Terrestrial Ecology


Research expertise
  • Cloning
  • Cultivation
  • Fungi
  • High-throughput amplicon sequencing
  • Metatranscriptomics
  • Oomycetes
  • Phylogeny
  • Plant pathogens
  • Protistology
  • Protozoology
  • Range-expanding plants
  • Taxonomy
  • qPCR

  • Page last updated: 14-09-2020

    VENI laureat; Junior Group Leader

    Current research 

    From January 2018 on I will start my three year VENI project. It aims at disentangling whether soil biodiversity affects plant performance, both of crop plant species and even more of natural (early- and mid-successional) plant species. I will focus on soil protists and a diversity gradient of up to 100 species, a diversity that to date has never been touched in diversity-functioning experiments. 

    ​ ​

    In line, in collaboration with Alex Jousset from Utrecht University I have been granted an NWO project that aims at applying soil protists to increase plant performance for applied purposes.

    To disentangle the importance of protists within the soil microbiome and to get a better understanding of soil biodiversity in general I will coollaborate with other scientists at the NIOO including Wim van der Putten, Paolina Gerbeva, Eiko Kuramae in diverse projects.

    However, I am also directly interested in other soil organisms, their diversity and ecological functioning and therefore directly include bacteria, fungi and nematodes in my studies using both classical cultivation based as well as molecular (qPCR, sequencing) approaches.

     

    Previous work

    ERC work on plant range expansion

    Between April 2014 and end 2017 I was working both at the NIOO and for a 8 months period at Wageningen University in Wim van der Puttens ERC project SPECIALS. In this project we tried to determine mechanistic abiotic and biotic drivers that help plants expand their range northwards in the course of climate warming. My role was to investigate the diversity and role of fungal and fungal like oomycete organisms associated with range-expanding and related native plants (e.g. Geisen et al. Frontiers in Microbiology 2017)

    Furthermore, I was involved in molecular analyses of bacteria, fungi and nematodes the plant's rhizosphere along a transect throughout Europe (from Greece to the Netherlands). My focus was to design mitochondrial and chloroplast blocking primers to allow higher coverage of bacteria inside roots and design a high-throughput sequencing methodology to study nematodes.

    I was collaborating with several partners within that project to disentangle belowground processed that determine range-expansion (e.g. Wilschut, Geisen et al. 2016 SBB)

     

    Figure 1: Summary scheme showing my current work; due to global climate change, plants expand their range towards the north, which might relax them from pathogens in their native area. This favors their performance in their expanded range. 

     

    Protist work

    Starting from my PhD and continuing thereafter, my major focus is on soil protists, and I am interested in many aspects including their diversity and their ecological functioning. 

    I am trying to raise awareness of the importance of soil protists in the scientific community; for instance I started thesoil protist initiative where more than a 100 scientists are involved in which also resulted in a large opinion paper with 47 authors. This initiative is in close link to the global soil biodiversity initiative. Furthermore, I am involved as a steering committee member in the global UniEuk project that aims at providing a universal taxonomic framework to better study and understand protists with help of all scientists working on protists. More details at the webpage and Berney at al. Journal of Eukaryotic Microbiology 2017. By standardizing and optimizing methods to study soil protists (Geisen & Bonkowski 2017), I hope to help a wider range of scientists to include protists in their studies.

     

    My entire interest on protists started with my PhD entitled “Soil Protists - Diversity, Distribution and Ecological Functioning” aimed at increasing the knowledge on soil protists across different European soils and were embedded in the EU project EcoFINDERS (http://ecofinders.dmu.dk/) and performed in the terrestrial ecology department at the University of Cologne, Germany. To approach this vast topic on soil protists I used a wide range of tools to investigate protist taxonomy, community composition, diversity and species-specific functioning. 

    The taxonomic (and phylogenetic) work resulted in the description of several new species and genera of soil protists and modifications of current phylogeny of many groups of protists (Geisen et al. 2014a, Geisen et al. 2014b, Berney, Geisen et al. 2015, Geisen et al. 2015c, ), such as new species of beautiful Cochliopodium (Figure 2). Other taxonomic and phylogenetic work on protists emerging from my PhD efforts descriptions Bass et al. 2016, Tice et al. 2016, Smirnov et al. 2017 showing that classical cultivation based work is fruitful but even more that a lot of this work is needed to get a better understanding of soil (protist) biodiversity!

        ​ ​

    Figure 2: Light microscopic pictures of the newly described species Cochliopodium plurinucleolum

     

    I also applied a range of techniques to study the  diversity and community structure of protists in soils and terrestrial environments ranging from microscope-based enrichment cultivation (Geisen et al. 2015) to a combination of cultivation and sequencing (Geisen et al. 2014c), to high-throughput sequencing approaches (Geisen et al. 2015a, Andriuzzi, Phuong-Thi, Geisen et al. 2016, Bass et al. 2016, Geisen et al. 2015b)

    All methods revealed that the diversity of soil protists is much higher than previously suggested as, in addition to the identification of several new protist taxa mentioned above, the diversity of soil protists in each investigated sample was high. 

     

    In my major research focus are ecological functioning of soil protists. Starting in my PhD work and continuing after, I could show that protists are much more than merely bacterivorous; I could show that mycophagous taxa (those that feed on fungi) are common (Geisen et al. 2016b) and that common soil protists can even feed on larger nematodes (Geisen et al. 2016c; Figure 3). Many soil protists seem to feed on different food sources and are therefore omnivores, which contradicts the classical perception of clearly separated and simple bacterial- and fungal energy channels in soils (Geisen et al. 2016d). 

    I could also elaborate that parasites are common among soil protists (Geisen et al. 2015) and that many of those inhabit larger soil organisms like mites and earthworms (Geisen et al. 2015b; Geisen et al. 2016e)

     

    Figure 3: Time series of soil amoebae feeding on a nematode

     

    These results lead to a conceptual revision of the soil food web (Figure 4, Geisen et al. 2016d).

     

     

     

    Figure 4: Conceptual model of soil food webs focusing on the diverse nodes occupied by protists

    • CV
    • Groepen
    • Wetenschappelijke publicaties
    • Populair-wetenschappelijke publicaties
    • Nevenfuncties

    Stefan Geisen

    Date of birth: 21 December 1983 in Lahnstein, Germany

    Current adresse: Bretagnesingel 138, 6666XX Heteren, the Netherlands

     

    WORK EXPERIENCE AND EDUCATION

    01/18 – 12/20          Junior Group leader with personal VENI (Innovational Research Incentives Scheme) grant; Netherland Institute for Ecology (NIOO), Wageningen, the Netherlands,

    11/16 – 12/17          Post-doctoral fellow; Netherland Institute for Ecology (NIOO), Wageningen, the Netherlands,

    04/16 – 11/16          Post-doctoral fellow; Wageningen University, Wageningen, NL

    04/14 – 03/16          Post-doctoral fellow; NIOO, Wageningen, the Netherlands

    04/11 – 03/14          PhD thesis; University of Cologne, Germany (Grade: Summa cum

                                     laude); Title: “Soil Protists: Diversity, Distribution and Ecological

                                     Functioning”

    10/10 – 02/11          Supply teacher for biology and mathematics; Elly-Heuss-Knapp Realschule, Cologne, Germany

    10/08 – 09/10        Master of Science in „General Biology“; University of Cologne (Grade: 1.3)

                                     Master thesis in collaboration with NIOO (Grade: 1.1)

    01/05 – 07-08        Bachelor of Science in Biology (Grade: 2.0)

    01/05 – 05/06          University of Maryland, College Park, USA (full scholarship)

    10/06 – 07/08          University of Cologne; Bachelor thesis at Bayer CropScience AG

                              (Frankfurt, Germany)

    05/03 – 06/04        Voluntary Year of Social Services; Federal sports association of Rhineland- Palatinate; Germany

    06/94 – 03/03          Abitur certificate; Johannes-Gymnasium, Lahnstein, Germany  

     

    PROFESSIONAL ACTIVITIES

    Published 28 Peer-reviewed scientific papers in international journals (15 first, one last authorships), one book chapter

    Active participation at more than 40 international workshops and conferences, including more than 20 invited oral presentations and organising and convening four sessions

    Initiator and manager of the Soil Protist Initiative in a joint effort with the Global Soil Biodiversity Initiative (GSBI)

    Steering committee member of the global project UniEuk

     

    Research stays

    • Nanjing University, Hainan University and Chongqing University (2016)
    • Natural history museum London (UK; 2014)
    • INRA (France; 2013)
    • St. Petersburg State University (Russia; 2012)

     

    Student helper at the University of Cologne (Germany; 2009);

    Erasmus-Semester; Lund University (Sweden; 2009)

     

    Internships

    • Federal Institute for Hydrology (BfG) (Germany; 2009)
    • Teagasc Research Station (Irland; 2008)
    • Bayer CropScience AG (Germany; 2007)

     

    Participation in professional training courses such as leadership and scientific writing

    Reviewer for more than 30 international journals and national funding agencies

    Review editor of Frontiers in Earth Science and Microbiology

    Invited to symposium presentations at 4 Universities

              

     

    Geisen Junior Group
    The research in the Geisen Junior Group focuses on the importance and interactions of soil biodiversity on plant performance with particular focus on protists...Read more

      2021

    • Bahram, M., Netherway, T., Frioux, C., Ferretti, P., Coelho, L. P., Geisen, S., Bork, P., & Hildebrand, F. (2021). Metagenomic assessment of the global diversity and distribution of bacteria and fungi. Environmental Microbiology, 23(1), 316-326. https://doi.org/10.1111/1462-2920.15314
    • 2020

    • Li, X., Zhu, H., Geisen, S., Bellard, C., Hu, F., Li, H., Chen, X., & Liu, M. (2020). Agriculture erases climate constraints on soil nematode communities across large spatial scales. Global Change Biology, 26(2), 919-930. https://doi.org/10.1111/gcb.14821
    • Tao, C., Li, R., Xiong, W., Shen, Z., Liu, S., Wang, B., Ruan, Y., Geisen, S., Shen, Q., & Kowalchuk, G. A. (2020). Bio-organic fertilizers stimulate indigenous soil Pseudomonas populations to enhance plant disease suppression. Microbiome, 8(1), [137]. https://doi.org/10.1186/s40168-020-00892-z
    • Koorem, K., Snoek, B., Bloem, J., Geisen, S., Kostenko, O., Manrubia, M., Ramirez, K., Weser, C., Wilschut, R., & van der Putten, W. H. (2020). Community-level interactions between plants and soil biota during range expansion. Journal of Ecology, Online. https://doi.org/10.1111/1365-2745.13409
    • Zhao, Z-B., He, J-Z., Quan, Z., Wu, C-F., Sheng, R., Zhang, L-M., & Geisen, S. (2020). Fertilization changes soil microbiome functioning, especially phagotrophic protists. Soil Biology & Biochemistry, 148. https://doi.org/10.1016/j.soilbio.2020.107863
    • De Gruyter, J., Weedon, J. T., Bazot, S., Dauwe, S., Fernandez-Garberí, P-R., Geisen, S., De La Motte, L. G., Heinesch, B., Janssens, I. A., Leblans, N., Manise, T., Ogaya, R., Löfvenius, M. O., Peñuelas, J., Sigurdsson, B. D., Vincent, G., & Verbruggen, E. (2020). Patterns of local, intercontinental and interseasonal variation of soil bacterial and eukaryotic microbial communities. FEMS Microbiology Ecology, 96(3), [fiaa018]. https://doi.org/10.1093/femsec/fiaa018
    • Wilschut, R., Magnée, K. J. H., Geisen, S., van der Putten, W. H., & Kostenko, O. (2020). Plant population and soil origin effects on rhizosphere nematode community composition of a range-expanding plant species and a native congener. Oecologia, 194, 237-250. https://doi.org/10.1007/s00442-020-04749-y
    • Geisen, S., Hu, S., dela Cruz, T. E. E., & Veen, G. F. (2020). Protists as catalyzers of microbial litter breakdown and carbon cycling at different temperature regimes. ISME Journal. https://doi.org/10.1038/s41396-020-00792-y
    • Xiong, W., Song, Y., Yang, K., Gu, Y., Wei, Z., Kowalchuk, G. A., Xu, Y., Jousset, A., Shen, Q., & Geisen, S. (2020). Rhizosphere protists are key determinants of plant health. Microbiome, 8(1). https://doi.org/10.1186/s40168-020-00799-9
    • Gu, Y., Dong, K., Geisen, S., Yang, W., Yan, Y., Gu, D., Liu, N., Borisjuk, N., Luo, Y., & Friman, V-P. (2020). The effect of microbial inoculant origin on the rhizosphere bacterial community composition and plant growth-promotion. Plant and Soil. https://doi.org/10.1007/s11104-020-04545-w
    • Oliverio, A. M., Geisen, S., Delgado-Baquerizo, M., Maestre, F. T., Turner, B. L., & Fierer, N. (2020). The global-scale distributions of soil protists and their contributions to belowground systems. Science advances, 6(4). https://doi.org/10.1126/sciadv.aax8787
    • 2019

    • Kurm, V., Geisen, S., & Hol, W. H. G. (2019). A low proportion of rare bacterial taxa responds to abiotic changes compared with dominant taxa. Environmental Microbiology, 21(2), 750-758. https://doi.org/10.1111/1462-2920.14492
    • Geisen, S., Briones, M. J. I., Gan, H., Behan-Pelletier, V. M., Friman, V-P., de Groot, G. A., Hannula, S. E., Lindo, Z., Philippot, L., Tiunov, A. V., & Wall, D. H. (2019). A methodological framework to embrace soil biodiversity. Soil Biology & Biochemistry, 136, [107536]. https://doi.org/10.1016/j.soilbio.2019.107536
    • Geisen, S., Wall, D. H., & van der Putten, W. H. (2019). Challenges and Opportunities for Soil Biodiversity in the Anthropocene. Current Biology, 29(19), R1036-R1044. https://doi.org/10.1016/j.cub.2019.08.007
    • Kurm, V., van der Putten, W. H., Weidner, S., Geisen, S., Snoek, B. L., Bakx, T., & Hol, W. H. G. (2019). Competition and predation as possible causes of bacterial rarity. Environmental Microbiology, 21(4), 1356-1368. https://doi.org/10.1111/1462-2920.14569
    • Ou, Y., Penton, C. R., Geisen, S., Shen, Z., Sun, Y., Lv, N., Wang, B., Ruan, Y., Xiong, W., Li, R., & Shen, Q. (2019). Deciphering Underlying Drivers of Disease Suppressiveness Against Pathogenic Fusarium oxysporum. Frontiers in Microbiology, 10, [02535]. https://doi.org/10.3389/fmicb.2019.02535
    • Liao, H., Zhao, Q., Cui, P., Chen, Z., Yu, Z., Geisen, S., Friman, V-P., & Zhou, S. (2019). Efficient reduction of antibiotic residues and associated resistance genes in tylosin antibiotic fermentation waste using hyperthermophilic composting. Environment International, 133, [105203]. https://doi.org/10.1016/j.envint.2019.105203
    • Liao, H., Friman, V-P., Geisen, S., Zhao, Q., Cui, P., Lu, X., Chen, Z., Yu, Z., & Zhou, S. (2019). Horizontal gene transfer and shifts in linked bacterial community composition are associated with maintenance of antibiotic resistance genes during food waste composting. Science of the Total Environment, 660, 841-850. https://doi.org/10.1016/j.scitotenv.2018.12.353
    • Wilschut, R. A., Geisen, S., Martens, H. J., Kostenko, O., De Hollander, M., Ten Hooven, F. C., Weser, C., Snoek, B., Bloem, J., Caković, D., Čelik, T., Koorem, K., Krigas, N., Manrubia, M., Ramirez, K. S. R., Tsiafouli, M. A., Vreš, B., & van der Putten, W. H. (2019). Latitudinal variation in soil nematode communities under climate warming-related range-expanding and native plants. Global Change Biology, 25(8), 2714-2726. https://doi.org/10.1111/gcb.14657
    • Xiong, W., Li, R., Guo, S., Karlsson, I., Jiao, Z., Xun, W., Kowalchuk, G. A., Shen, Q., & Geisen, S. (2019). Microbial amendments alter protist communities within the soil microbiome. Soil Biology & Biochemistry, 135, 379-382. https://doi.org/10.1016/j.soilbio.2019.05.025
    • Thakur, M. P., van der Putten, W. H., Cobben, M. M. P., Van Kleunen, M., & Geisen, S. (2019). Microbial invasions in terrestrial ecosystems. Nature Reviews Microbiology, Online, 621-631. https://doi.org/10.1038/s41579-019-0236-z
    • Zhao, Z-B., He, J-Z., Geisen, S., Han, L-L., Wang, J-T., Shen, J-P., Wei, W-X., Fang, Y-T., Li, P-P., & Zhang, L-M. (2019). Protist communities are more sensitive to nitrogen fertilization than other microorganisms in diverse agricultural soils. Microbiome, 7(1). https://doi.org/10.1186/s40168-019-0647-0
    • Gao, Z., Karlsson, I., Geisen, S., Kowalchuk, G., & Jousset, A. (2019). Protists: Puppet Masters of the Rhizosphere Microbiome. Trends in Plant Science, 24(2), 165-176. https://doi.org/10.1016/j.tplants.2018.10.011
    • Ramirez, K. S., Snoek, L. B., Koorem, K., Geisen, S., Bloem, L. J., ten Hooven, F., Kostenko, O., Krigas, N., Manrubia, M., Caković, D., van Raaij, D., Tsiafouli, M. A., Vreš, B., Čelik, T., Weser, C., Wilschut, R. A., & van der Putten, W. H. (2019). Range-expansion effects on the belowground plant microbiome. Nature Ecology and Evolution. https://doi.org/10.1038/s41559-019-0828-z
    • Wilschut, R. A., van der Putten, W. H., Garbeva, P. V., Harkes, P., Konings, W., Kulkarni, P., Martens, H. J., & Geisen, S. (2019). Root traits and belowground herbivores relate to plant-soil feedback variation among congeners. Nature Communications, 10, [1564(2019)]. https://doi.org/10.1038/s41467-019-09615-x
    • Manrubia, M., van der Putten, W. H., Weser, C., ten Hooven, F., Martens, H. J., Brinkman, E. P., Geisen, S., Ramirez, K., & Veen, G. F. (2019). Soil functional responses to drought under range-expanding and native plant communities. Functional Ecology, 33(12), 2402-2416. https://doi.org/10.1111/1365-2435.13453
    • van den Hoogen, J., Geisen, S., Routh, D., Ferris, H., Traunspurger, W., Wardle, D. A., de Goede, R. G. M., Adams, B. J., Ahmad, W., Andriuzzi, W. S., Bardgett, R. D., Bonkowski, M., Campos-Herrera, R., Cares, J. E., Caruso, T., de Brito Caixeta, L., Chen, X., Costa, S. R., Creamer, R.,... Crowther, T. W. (2019). Soil nematode abundance and functional group composition at a global scale. Nature, 572(7768), 194-198. https://doi.org/10.1038/s41586-019-1418-6
    • Thakur, M. P., & Geisen, S. (2019). Trophic regulations of the soil microbiome. Trends in Microbiology, 27(9). https://doi.org/10.1016/j.tim.2019.04.008
    • 2018

    • Zanella, A., Geisen, S., Ponge, J-F., Jagers, G., Benbrook, C., Dilli, T., Vacca, A., Kwiatkowska-Malina, J., Aubert, M., Fusaro, S., Nobili, M. D., Lomolino, G., & Gomiero, T. (2018). Humusica 2, article 17: techno humus systems and global change − three crucial questions: HUMUSICA 2 - Natural terrestrial humus systems. Applied Soil Ecology, 122, 237-253. https://doi.org/10.1016/j.apsoil.2017.10.010
    • Liao, H., Lu, X., Rensing, C., Friman, V. P., Geisen, S., Chen, Z., Yu, Z., Wei, Z., Zhou, S., & Zhu, Y. (2018). Hyperthermophilic Composting Accelerates the Removal of Antibiotic Resistance Genes and Mobile Genetic Elements in Sewage Sludge. Environmental Science and Technology, 52(1), 266-276. https://doi.org/10.1021/acs.est.7b04483
    • Geisen, S., Snoek, B., Ten Hooven, F. C., Duyts, H., Kostenko, O., Bloem, J., Martens, H. J., Quist, C. W., Helder, J., & van der Putten, W. H. (2018). Integrating quantitative morphological and qualitative molecular methods to analyse soil nematode community responses to plant range expansion. Methods in Ecology and Evolution, in press, 1366-1378. https://doi.org/10.1111/2041-210X.12999
    • Geisen, S., & Bonkowski, M. (2018). Methodological advances to study the diversity of soil protists and their functioning in soil food webs. Applied Soil Ecology, 123(February), -. https://doi.org/10.1016/j.apsoil.2017.05.021
    • Ramirez, K. S., Geisen, S., Morriën, E., Snoek, B. L., & van der Putten, W. H. (2018). Network Analyses Can Advance Above-Belowground Ecology. Trends in Plant Science, 23(9), 759-768. https://doi.org/10.1016/j.tplants.2018.06.009
    • Ferreira de Araujo, A. S., Mendes, L. W., Lemos, L. N., Lopes Antunes, J. E., Aguiar Beserra Jr, J. E., Catanho Pereira de Lyra, M. D. C., Barreto Figueiredo, M. D. V., de Almeida Lopes, A. C., Ferreira Gomes, R. L., Bezerra, W. M., Maciel Melo, V. M., de Araujo, F. F., & Geisen, S. (2018). Protist species richness and soil microbiome complexity increase towards climax vegetation in the Brazilian Cerrado. Communications Biology, 1, [135]. https://doi.org/10.1038/s42003-018-0129-0
    • Xiong, W., Jousset, A., Guo, S., Karlsson, I., Zhao, Q., Wu, H., Kowalchuk, G. A., Shen, Q., Li, R., & Geisen, S. (2018). Soil protist communities form a dynamic hub in the soil microbiome. ISME Journal, 12, 634-638. https://doi.org/10.1038/ismej.2017.171
    • Geisen, S., Mitchell, E. A. D., Adl, S., Bonkowski, M., Dunthorn, M., Ekelund, F., Fernández, L. D., Jousset, A., Krashevska, V., Singer, D., Spiegel, F. W., Walochnik, J., & Lara, E. (2018). Soil protists: a fertile frontier in soil biology research. FEMS Microbiology Reviews, 42(3), 293-323. https://doi.org/10.1093/femsre/fuy006
    • Griffiths, B. S., de Groot, G. A., Laros, I., Stone, D., & Geisen, S. (2018). The need for standardisation: Exemplified by a description of the diversity, community structure and ecological indices of soil nematodes. Ecological Indicators, 87, 43 - 46. https://doi.org/10.1016/j.ecolind.2017.12.002
    • 2017

    • Smirnov, A., Nassonova, E., Geisen, S., Bonkowski, M., Kudryavtsev, A., Berney, C., Glotova, A., Bondarenko, N., Dyková, I., Mrva, M., Fahrni, J., & Pawlowski, J. (2017). Phylogeny and Systematics of Leptomyxid Amoebae (Amoebozoa, Tubulinea, Leptomyxida). Protist, 168(2), 220-252. https://doi.org/10.1016/j.protis.2016.10.006
    • Geisen, S., Kostenko, O., Cnossen, M. C., ten Hooven, F. C., Vreš, B., & van Der Putten, W. H. (2017). Seed and root endophytic fungi in a range expanding and a related plant species. Frontiers in Microbiology, 8, [01645]. https://doi.org/10.3389/fmicb.2017.01645
    • Morriën, E., Hannula, S. E., Snoek, B., Helmsing, N. R., Zweers, H., De Hollander, M., Lujan Soto, R., Bouffaud, M. L., Buée, M., Dimmers, W., Duyts, H., Geisen, S., Girlanda, M., Griffiths, R. I., Jørgensen, H-B., Jensen, J., Plassart, P., Redecker, D., Schmelz, R. M.,... van der Putten, W. H. (2017). Soil networks become more connected and take up more carbon as nature restoration progresses. Nature Communications, 8, [14349]. https://doi.org/10.1038/ncomms14349
    • Geisen, S., Mitchell, E. A. D., Wilkinson, D. M., Adl, S., Bonkowski, M., Brown, M. W., Fiore-donno, A. M., Heger, T. J., Jassey, V. E. J., Krashevska, V., Lahr, D. J. G., Marcisz, K., Mulot, M., Payne, R., Singer, D., Anderson, O. R., Charman, D. J., Ekelund, F., Griffiths, B. S.,... Lara, E. (2017). Soil protistology rebooted: 30 fundamental questions to start with. Soil Biology & Biochemistry, 111, 94-103. https://doi.org/10.1016/j.soilbio.2017.04.001
    • Schulz-Bohm, K., Geisen, S., Wubs, E. R. J., Song, C., De Boer, W., & Garbeva, P. V. (2017). The prey’s scent – volatile organic compound mediated interactions between soil bacteria and their protist predators. ISME Journal, 11, 817-820. https://doi.org/10.1038/ismej.2016.144
    • Berney, C., Ciuprina, A., Bender, S., Brodie, J., Edgcomb, V., Kim, E., Rajan, J., Parfrey, L. W., Adl, S., Audic, S., Bass, D., Caron, D. A., Cochrane, G., Czech, L., Dunthorn, M., Geisen, S., Gloeckner, F. O., Mahe, F., Quast, C.,... de Vargas, C. (2017). UniEuk: Time to Speak a Common Language in Protistology! Journal of Eukaryotic Microbiology, 64(3), 407-411. https://doi.org/10.1111/jeu.12414
    • 2016

    • Bass, D., Silberman, J. D., Brown, M. W., Pearce, R. A., Tice, A. K., Jousset, A., Geisen, S., & Hartikainen, H. (2016). Coprophilic amoebae and flagellates, including Guttulinopsis, Rosculus and Helkesimastix, characterise a divergent and diverse rhizarian radiation and contribute to a large diversity of faecal-associated protists. Environmental Microbiology, 18(5), 1604-1619. https://doi.org/10.1111/1462-2920.13235
    • Tice, A. K., Shadwick, L. L., Fiore-Donno, A. M., Geisen, S., Kang, S., Schuler, G. A., Spiegel, F. W., Wilkinson, K. A., Bonkowski, M., Dumack, K., Lahr, D. J. G., Voelcker, E., Clauß, S., Zhang, J., & Brown, M. W. (2016). Expansion of the molecular and morphological diversity of Acanthamoebidae (Centramoebida, Amoebozoa) and identification of a novel life cycle type within the group. Biology Direct, 11(1), [69]. https://doi.org/10.1186/s13062-016-0171-0
    • Wilschut, R. A., Geisen, S., Ten Hooven, F. C., & van der Putten, W. H. (2016). Interspecific differences in nematode control between range-expanding plant species and their congeneric natives. Soil Biology & Biochemistry, 100, 233-241. https://doi.org/10.1016/j.soilbio.2016.06.025
    • Andriuzzi, W. S., Ngo, P-T., Geisen, S., Keith, A. M., Dumack, K., Bolger, T., Bonkowski, M., Brussaard, L., Faber, J. H., Chabbi, A., Rumpel, C., & Schmidt, O. (2016). Organic matter composition and the protist and nematode communities around anecic earthworm burrows. Biology and Fertility of Soils, 52(1), 91-100. https://doi.org/10.1007/s00374-015-1056-6
    • Griffiths, B. S., Römbke, J., Schmelz, R. M., Scheffczyk, A., Faber, J. H., Bloem, J., Pérès, G., Cluzeau, D., Chabbi, A., Suhadolc, M., Sousa, J. P., Martins Da Silva, P., Carvalho, F., Mendes, S., Morais, P., Francisco, R., Pereira, C., Bonkowski, M., Geisen, S.,... Stone, D. (2016). Selecting cost effective and policy-relevant biological indicators for European monitoring of soil biodiversity and ecosystem function. Ecological Indicators, 69, 213-223. https://doi.org/10.1016/j.ecolind.2016.04.023
    • Geisen, S. (2016). The bacterial-fungal energy channel concept challenged by enormous functional versatility of soil protists. Soil Biology & Biochemistry, 102(November), 22-25. https://doi.org/10.1016/j.soilbio.2016.06.013
    • Geisen, S., Koller, R., Huenninghaus, M., Dumack, K., Urich, T., & Bonkowski, M. (2016). The soil food web revisited: Diverse and widespread mycophagous soil protists. Soil Biology & Biochemistry, 94, 10-18. https://doi.org/10.1016/j.soilbio.2015.11.010
    • Geisen, S. (2016). Thorough high-throughput sequencing analyses unravels huge diversities of soil parasitic protists. Environmental Microbiology, 18(6), 1669-1672. https://doi.org/10.1111/1462-2920.13309
    • 2015

    • Geisen, S., Bonkowski, M., Zhang, J., & De Jonckheere, J. F. (2015). Heterogeneity in the genus Allovahlkampfia and the description of the new genus Parafumarolamoeba (Vahlkampfiidae; Heterolobosea). European Journal of Protistology, 51(4), 335-349. https://doi.org/10.1016/j.ejop.2015.05.003
    • Geisen, S., Tveit, A. T., Clark, I. M., Richter, A., Svenning, M. M., Bonkowski, M., & Urich, T. (2015). Metatranscriptomic census of active protists in soils. ISME Journal, 9(10), 2178-2190. https://doi.org/10.1038/ismej.2015.30
    • Geisen, S., Laros, I., Vizcaíno, A., Bonkowski, M., & de Groot, G. A. (2015). Not all are free-living: high-throughput DNA metabarcoding reveals a diverse community of protists parasitizing soil metazoa. Molecular Ecology, 24(17), 4556-4569. https://doi.org/10.1111/mec.13238
    • Geisen, S., Rosengarten, J., Koller, R., Mulder, C., Urich, T., & Bonkowski, M. (2015). Pack hunting by a common soil amoeba on nematodes. Environmental Microbiology, 17(11), 4538-4546. https://doi.org/10.1111/1462-2920.12949

      2019

    • Geisen, S. (2019). How do we show the importance of invisible soil organisms? Global Soil Biodiversity Initiative.
    • Wilschut, R. A., & Geisen, S. (2019). New insights in belowground drivers of plant performance. Global Soil Biodiversity Initiative. https://www.globalsoilbiodiversity.org/blog-beneath-our-feet/2019/4/4/new-insights-in-belowground-drivers-of-plant-performance
    • Manrubia, M., van der Putten, W. H., Weser, C., ten Hooven, F., Martens, H. J., Brinkman, E. P., Geisen, S., Ramirez, K., & Veen, G. F. (2019). Soil functional responses to drought under range-expanding and native plant communities: Lay Summary. (12 ed.) (Functional Ecology). https://besjournals.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1111%2F1365-2435.13453&file=fec13453-sup-0001-Summary.pdf
    • Geisen, S. (2019). The soil microbiome as a driver of plant communities and vegetation. Gewasbescherming, 50(2), 53. https://www.knpv.org/db/upload/documents/Gewasbescherming/2019gb50nr2.pdf
    • 2018

    • Lara, E., & Geisen, S. (2018). Soil protists: a fertile frontier in biology research. (OUPblog).

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