Dr. Katja Geißler

Dr. Katja Geißler
Foto: Dr. Katja Geißler

Contact

University of Potsdam

Biodiversity Research | Systematic Botany

Maulbeerallee 2a, room K.24
14469 Potsdam 

Phone: +49 331 977 1974 (Potsdam)

+49 33875 30621 (ökologische Station Gülpe)

E-Mail: kgeissle[at]uni-potsdam.de

 

Dr. Katja Geißler
Foto: Dr. Katja Geißler

Research Interests

  • Impacts of land use on plant functional diversity
  • Biotic interactions of plants and animals
  • Mechanisms of stress tolerance and stress avoidance of plants
  • Biogeochemical ecosystem processes in drylands
  • Nature conservation

 

 

Links

 

 

Supervised Thesis (selection)

  • Der Einfluss von Herbivorie auf den Wasserhaushalt holziger Savannenpflanzen: Jonas Roth 2020 (MSc)
  • The relationship between biological macropores and plant traits associated with drought adaptation at different sites along a rainfall gradient, Kalahari Namibia: Kaarina N. Shilula 2019 (MSc)
  • Predicting woody plant vulnerability to drought along a precipitation gradient in Namibia using vessels conductivity and wood density: Katharina Holst 2019 (MSc)
  • Effect of tree size on water partitioning between Senegalia mellifera and groundwater recharge in a semiarid savanna: Jessica Heblack 2018 (MSc)
  • The effect of biological macropores on water stress level of the perennial grass Stipagrostis uniplumis: Alexandra Straka 2018 (BSc)
  • Effects of ecotourism activities on plant diversity in a semiarid savanna in northern Botswana. Carina Hofmeister 2017 (MSc)
  • A study of isotopic composition of xylem water of woody vegetation and groundwater along a precipitation gradient in Namibia: Cristofina Kanyama 2016 (MSc)
  • Der Einfluss von Wurzelherbivorie und Nährstoffheterogenität im Boden auf die inter-spezifische Konkurrenz verschiedener Grünlandpflanzen: Anne Karpinski 2016 (MSc)
  • Wilting point and water sources of savanna species for different stages of their life cycle: Maria Schönen 2016 (MSc)
  • Habitat, Artenvielfalt und Konnektivität von basenreichen Trockenstandorten im Potsdam Brandenburger Havelgebiet: Maria Bönisch 2016 (MSc)
  • How much compensation is possible? Analysing the effects of grazing on growth and regrowth of annual and perennial grasses in a semi-arid Namibian savanna: Lisa Schrade 2015 (MSc)
  • Disentangling competition and facilitation for seedling establishment of a key bush encroacher in a semi-arid African savanna - A field experiment with Acacia mellifera: Vanessa Schönfeld-Janewa 2015 (MSc):
  • Der Effekt der Samenmasse auf die Keimung und der Einfluss des Niederschlags-musters auf das Etablierungswurzelwachstum der südafrikanischen Verbuschungsart Acacia mellifera: Stephan Mertens 2014 (BSc)
  • Konkurrenz um Wasser bei Grünlandarten der Unteren Havelaue entlang räumlicher und zeitlicher Gradienten: Eileen Massow 2014 (MSc)
  • Adapting an Ecohydrological Dryland Model for Simulating Soil Water and vegetation Dynamics of the Qinghai-Tibetan Plateau: Sebastian Fiedler 2013 (MSc)
  • Auswirkungen verschiedener Konkurrenz-Intensitäten auf zwei Phytometer-Arten entlang eines Feuchtigkeitsgradienten: Annika Grabau 2013 (BSc)
  • Auswirkungen von Salzwasser auf die Keimung der Samen von Frischwasser-Grünlandarten der Nord- und Ostseeküste: Marie Poppei 2013 (BSc)
  • Feedbacks between land use and plant functional traits of herbaceous vegetation in an African Savanna Rangeland: Claudia Hahn 2013  (MSc)
  • Libellenzönosen naturnaher Fließgewässer im Atlantischen Regenwald des Alto Parana (Misiones – Argentinien): Jonas von Tschirnhaus 2013 (MSc)
  • Einfluss von Konkurrenz und Stickstoff auf die Keimung und Etablierung verschiedener Arten aus basiphilen Trockenrasen: Janine Pottek 2011 (MScLehramt)
  • Relating colonization success and traits: a case study of former fields adjacent to dry grasslandsof land use on plant functional diversity: Kolja Bergholz 2010 (MSc)

 

 

Education and Experience

  • 2019 - : Lecturer, University of Potsdam, Germany
  • 2019 - : Subproject leader - Scale crossing water fluxes in Drylands (ORYCS project), University of Potsdam
  • 2014 - 2018: Coordinator and Postdoctoral Researcher on Plant traits in Drylands (OPTIMASS project), Plant Ecology and Nature Conservation, University of Potsdam
  • 2009 - 2014: Postdoctoral Researcher on ecohydrological modeling of Dryland Ecosystems (projects: GLOWA, TIP) , Department of Plant Ecology and Nature Conservation, University of Potsdam
  • 2008 - 2009: Postdoctoral Researcher: Impacts of the Horse-chestnut leave miner, Department of Ecophysiology, University of Potsdam, Germany,
  • 2006: Teaching and Research Assistant, Universidad Autónoma de Puebla, Instituto de Ciencias, Mexico
  • 2000 - 2007:  PhD in Ecology, University of Potsdam, Germany (with Prof. Dr. Axel Gzik: “Life strategies of rare river corridor plants with particular emphasis on stress resistance")
  • 1999, 2002, 2003 Maternity leave
  • 1992 - 1998: Diplom (equiv. MSc) in Biology, Humboldt University of Berlin, Germany and University of Wales, Aberystwyth, UK (thesis:"Variability of stand structure and ecophysiology of different clones of common reed after planting on a degraded fen")

 

 

Publications

  • Marquart A, Eldridge DJ, Geissler K, Lobas C & Blaum N (2020). Interconnected effects of shrubs, invertebrate‐derived macropores and soil texture on water infiltration in a semi‐arid savanna rangeland. Land Degradation and Development. DOI: 10.1002/ldr.3598.
  • Marquart A, Geissler K, Heblack J, Lobas C, Münch E & Blaum N (2020). Individual shrubs, large scale grass cover and seasonal rainfall explain invertebrate-derived macropore density in a semi-arid Namibian savanna. Journal of Arid Environments 176doi:10.1016/j.jaridenv.2020.104101.
  • Geissler K, Fiedler S, Ni J, Herzschuh U, Jeltsch F (2019): Combined effects of grazing and climate warming drive shrub dominance on the Tibetan PLateau. The Rangeland Journal 41: 425-429,  doi:10.1071/RJ19027
  • Geissler K, Heblack J, Uugulu S., Wanke H, Blaum N (2019): Partitioning of water between differently sized shrubs and potential groundwater recharge in a semiarid savanna in Namibia. Frontiers in Plant Science,  doi:10.3389/fpls.2019.01411
  • Geissler K, Hahn C, Joubert D, Blaum N (2019): Functional responses of the herbaceous plant community explain ecohydrological feedbacks of savanna shrub encroachment. Perspectives in Plant Ecology and Evolution39, doi:10.1016/j.ppees.2019.125458
  • Hering R, Hauptfleisch M, Geißler K, Marquart A, Schoenen M & Blaum N (2019). Shrub encroachment is not always land degradation: Insights from ground dwelling beetle species niches along a shrub cover gradient in a semi-arid Namibian savanna. Land Degradation and Development30: 14-27.
  • Reinhard J, Geissler K, Blaum N (2019): Short-term responses of darkling beetles (Coleoptera:Tenebrionidae) to the effects of fire and grazing in savannah rangeland. Insect Conservation and Diversity 12: 39-48.
  • Poppei M., Michael Ristow, Katja Geissler & Johannes Metz (2018): Die Bestandssituation des Breitblättrigen Knabenkrautes (Dactylorhiza majalis [Rchb.] Hunt et Summerhayes subsp. majalis) in ausgewählten Schutzgebieten Brandenburgs. Naturschutz und Landschaftspflege in Brandenburg, 27 (1) 20-27.
  • Synodinos AD, Eldridge D, Geißler K, Jeltsch F, Lohmann D, Midgley G & Blaum N (2018). Remotely sensed canopy height reveals three pantropical ecosystem states: comment. Ecology. DOI: 10.1002/ecy.1997
  • Weiss L, Schalow L, Jeltsch F, Geissler K (2018) Experimental evidence for root competition effects on community evenness in one of two phytometer species. – Journal of Plant Ecology. doi.org/10.1093/jpe/rty021
  • Geißler K , Gzik A (2016) Lebensstrategien seltener Stromtalpflanzen. In: Beiträge aus dem Nationalpark Unteres Odertal Band1/2016, Daten vom Fluss: Wissenschaftliche Untersuchungen und aktuelle Anwendungsaspekte in Auenlandschaften. Nationalpark Unteres Odertal (Hrsg.) 74-78
  • Bergholz K, Jeltsch F, Weiss L, Pottek J, Geißler K, Ristow M (2015) Fertilization affects the establishment ability of species differing in seed mass via direct nutrient addition and indirect competition effects. Oikos. DOI:10.1111/oik.02193
  • Lohmann D, Falk T, Geissler K, Blaum N, Jeltsch F (2014). Determinants of semi-arid rangeland management in a land reform setting in Namibia. Journal of Arid Environments100 - 101. pp. 23 - 30. http://dx.doi.org/10.1016/j.jaridenv.2013.10.005
  • Müller, E N, L van Schaik, T Blume, A Bronstert, J Carus, J H Fleckenstein, N Fohrer, K Geißler, H H Gerke, T Graeff, C  Hesse, A Hildebrandt, F Hölker, P Hunke, K Körner, J Lewandowski, Lohmann  D , K Meinikmann, A Schibalski, B Schmalz, B Schröder und B Tietjen (2014): Scales, key aspects, feedbacks and challenges of ecohydrological research in Germany. HyWa58: 221-240 DOI: 10.5675/HyWa_2014,4_2
  • Schaldach R, Wimmer F,  Koch J, Volland J, Geißler K, Köchy M  (2013). Model based analysis of the environmental impacts of grazing management on Eastern Mediterranean ecosystems in Jordan. Journal of Environmental Management127, 84-95
  • Jeltsch F, Blaum N,  Brose U, Chipperfield J, Clough Y, Farwig N, Geissler K, Graham C, Grimm V, Hickler T, Huth A, May F, Meyer K, Pagel J, Reineking B, Rillig M, Shea K, Schurr F, Schroeder B, Weiss L, Wiegand K, Wiegand T, Wirth C, Zurell D (2012). How can we better link empirical studies and models in functional biodiversity research? Basic and Applied Ecology14: 93-101.
  • Geissler, K. and Gzik, A. (2010). Germination ecology of Cnidium dubium, Gratiola officinalis and Juncus atratus, three endangered River corridor plants of Central European lowlands. Flora205, 590-598
  • Geissler, K. and Gzik, A. (2008). The impact of flooding and drought on seeds of Cnidium dubium, Gratiola officinalis, and Juncus atratus, three endangered perennial River corridor plants of Central European lowlands. Aquatic Botany89, 283-291
  • Geissler, K. and Gzik, A. (2008). Ramet demography and ecological attributes of the perennial river corridor plant Cnidium dubium. Flora203, 396-408
  • Pflugmacher, S., Geissler, K., Steinberg, C.E.W. (1999). Activity of phase I and phase II detoxification enzymes in different cormus parts of Phragmites australis. Ecotoxicol Environ Saf42 (1): 62-66.
  • Koppitz, H., Kühl, H., Henze, R., Geissler, K., Eitner, A. and Kohl, J.-G. (1999). Comparison of the development of different reed clones (Phragmites australis) established at a reflooded fen area. I. Seasonal development of stand structure, culm morphology and productivity (in German). Archives of Nature Conservation and Landscape Research38, 145-166.
  • Koppitz, H., Kühl, H., Geissler, K., and Kohl, J.-G. (1999). Comparison of the development of different reed clones (Phragmites australis) established at a reflooded fen area. II. C/N-balance and rhizome ventilation. Archives of Nature Conservation and Landscape Research38, 167-191.