Hülsmann, Stephan

Academic Officer

  • Stephan Hülsmann
    UNU-FLORES, Ammonstrasse 74, Dresden, 01067, Germany
    +49 (0) 351 8921 9374

    Research Interests

    • Impact of climate change on ecosystems and resource cycling
    • Reservoir ecology and management
    • Systems and flux analysis for resources management


    • PhD (Dr. rer. nat.) in Aquatic Ecology, Technische Universität Dresden, Germany
    • Diplom in Biology, Georg-August Universität Göttingen, Germany

    Biographical Statement

    Stephan Hülsmann is an Academic Officer at UNU-FLORES where he leads the Systems and Flux Analysis considering Global Change Assessment unit. He studied Biology in Göttingen, Kiel and Lund (Sweden) and graduated (Diplom) in Göttingen, Germany. He obtained his PhD at Technische Universität Dresden (integrated water quality management in reservoirs), followed by a research project at the Netherlands Institute of Ecology of the Royal Netherlands Academy of Arts and Sciences.

    After returning to TU Dresden he worked as a senior research scientist with the interdisciplinary Hydro Sciences Department, Institute of Hydrobiology, prior to assuming his function as Project Officer at the UNU Vice Rectorate in Europe and UNU-FLORES, mainly managing and establishing partnerships and projects in Africa. His research focuses on integrated water and watershed management, nutrient fluxes, and on responses of aquatic systems to stressors such as eutrophication and climate change, using systems analysis approaches, modelling, as well as experimental approaches.

    Stephan Hülsmann is currently also serving as the PhD Programme Coordinator for the joint Doctoral Programme in Integrated Management of Water, Soil and Waste with Technische Universität Dresden.

  • Articles

    • Andreu, Ana, Dube, Timothy, Nieto, Hector, Mudau, Azwitamisi E., González-Dugo, María P., Guzinski, Radoslaw and Hülsmann, Stephan (2019). Remote Sensing of Water Use and Water Stress in the African Savanna Ecosystem at Local Scale – Development and Validation of a Monitoring Tool. Physics and Chemistry of the Earth, 1-11
    • Gebrechorkos, Solomon H., Hülsmann, Stephan and Bernhofer, Christian (2019). Regional Climate Projections for Impact Assessment Studies in East Africa. Environmental Research Letters, 14(4), 1-14
    • Gebrechorkos, Solomon H., Hülsmann, Stephan and Bernhofer, Christian (2019). Statistically Downscaled Climate Dataset for East Africa. Scientific Data, 1-8
    • Gebrechorkos, Solomon H., Bernhofer, Christian and Hülsmann, Stephan (2019). Impacts of Projected Change in Climate on Water Balance in Basins of East Africa. Science of The Total Environment, 682, 160-170
    • Gebrechorkos, Solomon H., Hülsmann, Stephan and Bernhofer, Christian (2019). Long-term trends in rainfall and temperature using high-resolution climate datasets in East Africa. Scientific Reports, 9(1), 1-9
    • Hülsmann, Stephan, Sušnik, Janez, Rinke, Karsten, Langan, Simon, van Wijk, Dianneke, Janssen, Annette BG. and Mooij, Wolf M. (2019). Integrated modelling and management of water resources: the ecosystem perspective on the nexus approach. Current Opinion in Environmental Sustainability, 40, 14-20
    • Gebrechorkos, Solomon H., Hülsmann, Stephan and Bernhofer, Christian (2018). Evaluation of Multiple Climate Data Sources for Managing Environmental Resources in East Africa. Hydrology and Earth System Sciences, 22(8), 4547-4564
    • Jampani, Mahesh, Hülsmann, Stephan, Liedl, Rudolf, Sonkamble, Sahebrao, Ahmed, Shakeel and Amerasinghe, Priyanie (2018). Spatio-Temporal Distribution and Chemical Characterization of Groundwater Quality of a Wastewater Irrigated System: A Case Study. Science of The Total Environment, 636, 1089-1098
    • Gebrechorkos, Solomon H., Hülsmann, Stephan and Bernhofer, Christian (2018). Changes in Temperature and Precipitation Extremes in Ethiopia, Kenya, and Tanzania. International Journal of Climatology, n/a-n/a
    • Daher, Bassel, Saad, Walid, Pierce, Suzanne A., Hülsmann, Stephan and Mohtar, Rabi H. (2017). Trade-offs and Decision Support Tools for FEW Nexus-Oriented Management. Current Sustainable/Renewable Energy Reports, 4(12), 1-7
    • Sallwey, Jana, Hettiarachchi, Hiroshan and Hülsmann, Stephan (2017). Challenges and Opportunities in Municipal Solid Waste Management in Mozambique: A Review in the Light of Nexus Thinking. AIMS Environmental Science, 4(5), 621-639
    • Mannschatz, Theresa, Hülsmann, Stephan and Wolf, Tobias (2016). Nexus Tools Platform: Web-Based Comparison of Modelling Tools for Analysis of Water-Soil-Waste Nexus. Environmental Modelling & Software, 76, 137-153
    • Gan, Thian Yew, Ito, Mari, Hülsmann, Stephan, Qin, Xiaosheng, Lu, Xi Xi, Liong, Shie-Yui, Rutschman, Peter, Disse, Markus and Koivusalo, Harri (2016). Possible Climate Change/Variability and Human Impacts, Vulnerability of Drought-Prone Regions, Water Resources and Capacity Building for Africa. Hydrological Sciences Journal, 61(7), 1209-1226
    • Wagner, A, S. Hülsmann, W. Horn, Thomas Schiller, T. Schulze, S. Volkmann, and J. Benndorf. 2013. “Food-Web-Mediated Effects of Climate Warming: Consequences for the Seasonal Dynamics of Daphnia.” Freshwater Biology 58 (3): 573–87. doi:10.1111/j.1365-2427.2012.02809.x.
    • Pitsch, M., V. Awassi, E. Susko, and S. Hülsmann. 2012. “Effects of Zooplankton Dynamics on Epilimnetic Phosphorus Loss.” Freshwater Biology 57: 704–15. doi:10.1111/j.1365-2427.2012.02736.x.
    • Wagner, A, S. Hülsmann, L. Paul, Rüdiger J. Paul, T. Petzoldt, René Sachse, Thomas Schiller, Bettina Zeis, J. Benndorf, and T. U. Berendonk. 2012. “A Phenomenological Approach Shows a High Coherence of Warming Patterns in Dimictic Aquatic Systems across Latitude.” Marine Biology 159 (11): 2543–59. doi:10.1007/s00227-012-1934-5.
    • Hülsmann, S., Annekatrin Wagner, Matthias Pitsch, Wolfgang Horn, R. J. Paul, Anne Rother, and Bettina Zeis. 2012. “Effects of Winter Conditions on Daphnia Dynamics and Genetic Diversity in a Dimictic Temperate Reservoir.” Freshwater Biology 57: 1458–70. doi:10.1111/j.1365-2427.2012.02810.x.
    • Hülsmann, S. 2011. “The Combined Effect of Bottom-up and Top-down Factors on Life History and Reproduction of Daphnia in the Field: Is a Strategic Dilemma Underlying Population Declines?” Journal of Limnology 70: 378–86. doi:10.3274/JL11-70-2-22.
    • Hülsmann, S., K. Rinke, and W. M. Mooij. 2011. “Size-Selective Predation and Predator-Induced Life-History Shifts Alter the Outcome of Competition between Planktonic Grazers.” Functional Ecology 25: 199–208. doi:10.1111/j.1365-2435.2010.01768.x.
    • Rother, Anne, M. Pitsch, and S. Hülsmann. 2010. “The Importance of Hatching from Resting Eggs for Population Dynamics and Genetic Composition of Daphnia in a Deep Reservoir.” Freshwater Biology 55: 2319–31. doi:10.1111/j.1365-2427.2010.02441.x.
    • Mooij, W. M., Dennis Trolle, E. Jeppensen, G. Arhonditsis, P. V. Belolipetsky, B. R. Chitamwebwa, A. G. Degermendzhy, et al. 2010. “Challenges and Opportunities for Integrating Lake Ecosystem Modelling Approaches.” Aquatic Ecology 44: 633–67. doi:10.1007/s10452-010-9339-3.
    • Wagner, A., S. Hülsmann, L. Paul, T. Petzoldt, T. U. Berendonk, and J. Benndorf. 2009. “Der Einfluss von Klimavariabilität Auf Aquatische Nahrungsnetze.” Wissenschaftliche Zeitschrift Der Technischen Universität Dresden 58: 77–82.
    • Mooij, W. M., L. N. De Senerpont Domis, and S. Hülsmann. 2008. “The Impact of Climate Warming on Water Temperature, Timing of Hatching and Young-of-the-Year Growth of Fish in Shallow Lakes in the Netherlands.” Journal of Sea Research 60: 32–43. doi:10.1016/j.seares.2008.03.002.
    • Kahl, U., S. Hülsmann, R. J. Radke, and J. Benndorf. 2008. “The Impact of Water Level Fluctuations on the Year Class Strength of Roach: Implications for Fish Stock Management.” Limnologica 38: 258–68.
    • Hülsmann, Stephan, Thomas Petzoldt, Sabine Jähnichen, and Susanne Rolinski. 2008. “Integrating Approaches in Limnological Research: From Basic to Applied and from Empirical to Theoretical.” Limnologica 38 (October): 175–78.
    • Rinke, K., S. Hülsmann, and W. M. Mooij. 2008. “Energetic Costs, Underlying Resource Allocation Patterns, and Adaptive Value of Predator-Induced Life-History Shifts.” Oikos 117: 273–85.
    • Dörner, H., S. Hülsmann, F. Hölker, C. Skov, and A. Wagner. 2007. “Size-Dependent Predator-Prey Relationships between Pikeperch and Their Prey Fish.” Ecology of Freshwater Fish 16: 307–14.
    • Hülsmann, S., and A. Wagner. 2007. “Multiple Defence Strategies of Daphnia galeata against Predation in a Weakly Stratified Reservoir.” Hydrobiologia 594: 187–99. doi:10.1007/s10750-007-9087-0.
    • Kasprzak, P., J. Benndorf, T. Gonsiorczyk, R. Koschel, L. Krienitz, T. Mehner, S. Hülsmann, H. Schultz, and A. Wagner. 2007. “Reduction of Nutrient Loading and Biomanipulation as Tools in Water Quality Management: Long-Term Observations on Bautzen Reservoir and Feldberger Haussee (Germany).” Lake and Reservoir Management 23: 410–27. doi:10.1080/07438140709354027.
    • De Senerpont Domis, L. N., W. M. Mooij, S. Hülsmann, E. H. van Nes, and M. Scheffer. 2007. “Can Overwintering versus Diapausing Strategy in Daphnia Determine Match-Mismatch Events in Zooplankton-Algae Interactions?” Oecologia 150: 682–98. doi:10.1007/s00442-006-0549-2.
    • Mooij, W. M., J. H. Janse, L. N. De Senerpont Domis, S. Hülsmann, and B. W. Ibelings. 2007. “Predicting the Effect of Climate Change on Temperate Shallow Lakes with the Ecosystem Model PCLake.” Hydrobiologia 584: 443–54.
    • Hülsmann, Stephan, Heidemarie Horn, Wolfgang Horn, Uwe Kahl, Lothar Paul, Robert J. Radke, Susanne Worischka, and Jürgen Benndorf. 2006. “Relations between Food Web Structure and Nutrient Budget in a Stratified Lake: Results from a Whole-Lake Experiment in Saidenbach Reservoir, Germany.” Verhandlungen Der Internationalen Vereinigung Für Theoretische Und Angewandte Limnologie 29: 1543–47.
    • Wagner, A., S. Hülsmann, M. Bollenbach, and J. Benndorf. 2005. “Piscivory as a Factor Controlling Invertebrate Predators (Leptodora kindtii, Chaoborus flavicans, Piona spp.) in a Biomanipulated Reservoir.” Verhandlungen Der Internationalen Vereinigung Für Theoretische Und Angewandte Limnologie 29: 993–96.
    • Mooij, W. M., S. Hülsmann, L. N. De Senerpont Domis, B. A. Nolet, P. L. E. Bodelier, P. C. M. Boers, M. L. Dionisio Pires, et al. 2005. “The Impact of Climate Change on Lakes in the Netherlands: A Review.” Aquatic Ecology 39: 381–400.
    • Hülsmann, S., K. Rinke, and W. M. Mooij. 2005. “A Quantitative Test of the Size Efficiency Hypothesis by Means of a Physiologically Structured Model.” Oikos 110: 43–54.
    • Wagner, A, S. Hülsmann, H. Dörner, M. Janssen, U. Kahl, T. Mehner, and J. Benndorf. 2004. “Initiation of the Midsummer Decline of Daphnia as Related to Predation, Non-Consumptive Mortality and Recruitment: A Balance.” Archiv Für Hydrobiologie 160: 1–23.
    • Hülsmann, S., J. Vijverberg, M. Boersma, and W. M. Mooij. 2004. “Effects of Infochemicals Released by Gape-Limited Fish on Life History Traits of Daphnia: A Maladaptive Response?” Journal of Plankton Research 26: 535–43. doi:10.1093/plankt/fbh054.
    • Hülsmann, S. 2003. “Recruitment Patterns of Daphnia: A Key for Understanding Midsummer Declines?” Hydrobiologia 491: 35–46. doi:10.1023/A:1024424513404.
    • Dörner, H., S. Berg, L. Jakobsen, S. Hülsmann, M. Brobjerg, and A. Wagner. 2003. “The Feeding Behaviour of Large Perch Perca fluviatilis (L.) in Relation to Food Availability: A Comparative Study.” Hydrobiologia 506: 427–34.
    • Dörner, H., J. Benndorf, S. Hülsmann, U. Kahl, T. Mehner, H. Schultz, T. Schulze, and A. Wagner. 2003. “Size-Dependent Predation on Juvenile Fish by Perch and Zander in Relation to Prey Fish Availability.” In , edited by T. P. Barry and J. A. Malison, 80–81. Madison, Wisconsin, U.S.A. University of Wisconsin Sea Grant Institute, Madison, WI.
    • Mooij, W. M., S. Hülsmann, J. Vijverberg, A. Veen, and E. H. R. R. Lammens. 2003. “Modeling Daphnia Population Dynamics and Demography under Natural Conditions.” Hydrobiologia 491: 19–34.
    • Hülsmann, S., and H. Voigt. 2002. “Life-History of Daphnia galeata in a Hypertrophic Reservoir and Consequences of Non-Consumptive Mortality for the Initiation of a Midsummer Decline.” Freshwater Biology 47: 2313–24. doi:10.1046/j.1365-2427.2002.00991.x.
    • Voigt, H., and S. Hülsmann. 2001. “Do Fast Increasing Food Conditions Promote the Midsummer Decline of Daphnia Galeata?” Hydrobiologia 442: 253–59.
    • Hülsmann, S. 2001. “Reproductive Potential of Daphnia galeata in Relation to Food Conditions: Implications of a Changing Size-Structure of the Population.” Hydrobiologia 442: 241–52. doi:10.1023/A:1017534122780.
    • Hülsmann, S., and W. Weiler. 2000. “Adult, Not Juvenile Mortality as a Major Reason for the Midsummer Decline of a Daphnia Population.” Journal of Plankton Research 22: 151–68. doi:10.1093/plankt/22.1.151.
    • Hülsmann, S., T. Mehner, S. Worischka, and M. Plewa. 1999. “Is the Difference in Population Dynamics of Daphnia galeata in Littoral and Pelagic Areas of a Long-Term Biomanipulated Reservoir Affected by Age-0 Fish Predation?” Hydrobiologia 408/409: 57–63.
    • Mehner, T., S. Hülsmann, S. Worischka, M. Plewa, and J. Benndorf. 1998. “Is the Midsummer Decline of Daphnia Really Induced by Age-0 Fish Predation? Comparison of Fish Consumption and Daphnia Mortality and Life History Parameters in a Biomanipulated Reservoir.” Journal of Plankton Research 20: 1797–1811. doi:10.1093/plankt/20.9.1797.
    • Mehner, T., M. Plewa, S. Hülsmann, and S. Worischka. 1998. “Gape-Size Dependent Feeding of Age-0 Perch (Perca fluviatilis) and Age-0 Zander (Stizostedion lucioperca) on Daphnia galeata.” Archiv Für Hydrobiologie 142: 191–207.
    • Hülsmann, S., and T. Mehner. 1997. “Predation Impact of Underyearling Perch (Perca fluviatilis) on a Daphnia galeata Population in a Short-Term Enclosure Experiment.” Freshwater Biology 38: 209–19. doi:10.1046/j.1365-2427.1997.00208.x.
    • Mehner, T., M. Plewa, S. Hülsmann, H. Voigt, and J. Benndorf. 1997. “Age-0 Fish Predation on Daphnids – Spatial and Temporal Variability in the Top-down Manipulated Bautzen Reservoir.” Archiv Für Hydrobiologie Special Issues Advances in Limnology 49: 13–25.


    Book Chapters

    Conference Proceedings

    • Hülsmann, Stephan and Ardakanian, Reza ed. Special Session at the Symposium of European Freshwater Sciences (SEFS 8): Societal Concerns and Capacity Development 2013/07/01-05 Münster, Germany. Dresden, Germany: United Nations University Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES), 2014.
    • Ardakanian, Reza, and Stephan Hülsmann. 2014. “Introduction to the Proceedings of the Special Session.” In Proceedings of the Special Session “Societal Concerns and Capacity Development” Organized by UNU-FLORES at the Symposium of European Freshwater Sciences (SEFS 8). Proceedings 3. Dresden: UNU-FLORES.
    • Hülsmann, Stephan, and Reza Ardakanian. 2014a. “Advancing a Nexus Approach to the Sustainable Management of Environmental Resources: Capacity Development Activities of the United Nations University Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES).” In Proceedings of the Special Session “Societal Concerns and Capacity Development” Organized by UNU-FLORES at the Symposium of European Freshwater Sciences (SEFS 8). Proceedings 3. Dresden: UNU-FLORES.
    • Ardakanian, Reza, Stephan Hülsmann, and Benjamin Zhu, ed. 2013. Opening Ceremony Proceedings UNU-FLORES, 10 December 2012. Proceedings 2. Dresden: UNU-FLORES.
    • Hülsmann, Stephan and Ardakanian, Reza ed. Regional Workshop on Establishment of a Network for Partnership of UNU-FLORES Based in Maputo, Mozambique 2013/05/06-08 Maputo, Mozambique. Dresden, Germany: United Nations University Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES), 2013.
    • Ardakanian, Reza, S. Hülsmann, and P. Krebs. 2011. “The New UNU Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES) in Dresden (Germany) and Maputo: Core Areas of Focus and Twinning Concept.” In Proceedings on Research and Capacity Development on Water Resources Management by the United Nations University: focus on Africa, edited by R. Ardakanian and Jens Liebe. Bonn: UNW-DPC.
    • Ardakanian, Reza, Hülsmann, Stephan and Johmann, Jessica ed. 2nd International Scoping Workshop 2011/10/24-25 Maputo, Mozambique. Paffenholz, Germany: UNU-ViE, 2011.
    • Ardakanian, Reza, Hülsmann, Stephan and Johmann, Jessica ed. 1st International Scoping Workshop 2010/11/11-12 Dresden, Germany. Bonn, Germany: UNU-ViE, 2010.