Dr. rer. nat. Ulrike Scharfenberger

Scientist

Contact

Department River Ecology

Helmholtz-Zentrum
für Umweltforschung - UFZ
Brückstr. 3a, 39114 Magdeburg

Tel: +49 391 810 9653

ulrike.scharfenberger[at]ufz.de

Ulrike Scharfenberger

Academic positions

Since 2020 Scientist in the Department of River Ecology at the Helmholtz Center for Environmental Research - UFZ, Magdeburg, Germany.
2019 - 2020 Postdoc in the working group Light Pollution and Ecophysiology in the Department of Ecohydrology at the Leibniz Institute for Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany.

2016 - 2018 Postdoc in the working group Long-term and Climate Impact Research of Lake Ecosystems in the department for Ecosystem Research at the Leibniz Institute for Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany.

2010 - 2016 PhD in the working group Long-term and Climate Impact Research of Lake Ecosystems in the department for Ecosystem Research at the Leibniz Institute for Freshwater Ecology and Inland Fisheries (IGB), Berlin, and the Freie Universität Berlin.

2006 - 2007 Research assistant in the Neuroinformatics Research Group in the Department of Information and Computer Science at Helsinki University of Technology, Finland.
2003 - 2005 Research assistant in the department for Computer Engineering at the University of Tübingen, Germany.

Education

2010 - 2016 PhD in the working group Long-term and Climate Impact Research in the department for Ecosystem Research at the Leibniz Institute for Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany. 

  • Doctoral degree (rerum naturalium) in biology at Freie Universität Berlin (summa cum laude)
2000 - 2009 Study of computer science with additional qualification for bioinformatics at the Wilhelm-Schickard Institute for Computer Science at the Eberhard-Karls-University Tübingen, Germany.

  • Degree: Diplom-Informatikerin (Bioinformatik)
  • Title of the thesis: "Concepts for building a functional brain map - Towards a neuroscientific retrieval and mining tool for fMRI research studies"

Awards

  • Nominated for the Leibniz Dissertation Award (10 out of 800).

Research interests

My interest is in understanding systemic processes in river and lake ecosystems, such as ecosystem metabolism. My focus is on the investigation of the effects of global change on process dynamics, in particular on non-linear, threshold-driven changes.

Methodologically, my studies are based on both long-term data and experimental data and realize a close relationship between data-driven analysis and ecological theories, as well as results from ecological modelling.

Methodical: statistical modelling, time series analysis, nonlinear optimization, mesocosm experiments

  • Climate change and eutrophication
  • Threshold-driven processes in freshwater ecosystems
  • Abrupt changes in zooplankton community composition with specific consideration of external and internal drivers
  • Capability of early warning signals to predict impeding regime shifts based on empirical long-term data
  • Interacting effects of nutrients, temperature and water level changes on ecosystem metabolism, periphyton and macrophytes
  • Influence of stratification on lake metabolism and metabolic balance
  • Difficulties in the application of the 24 h oxygen curve method to estimate metabolic rates in small wind sheltered lakes dominated by horizontal convective mixing


Projects

HI-CAM (Helmholtz-Initiative Climate Adaptation and Mitigation)

Sub-project: Climate change effects on the water quality of large rivers in Germany.


Research profiles


Researcher ID

ORCID

ResearchGate


Publications


2020 (1)

Other publications


  • Ulrike Scharfenberger, Erik Jeppesen, Meryem Beklioğlu, Martin Søndergaard, David G.Angeler, Ayşe İdil Çakıroğlu, Stina Drakare, Josef Hejzlar, Aldoushy Mahdy, Eva Papastergiadou, Michal Šorf, Kostantinos Stefanidis, Arvo Tuvikene, Priit Zingel, Rita Adrian (2019): Effects of trophic status, water level and temperature on shallow lake metabolism and metabolic balance: A standardised pan-European mesocosm experiment. Limnology and Oceanography, 64: 616-631
  • Ülkü Nihan Tavşanoğlu, Michal Šorf, Konstantinos Stefanidis, Sandra Brucet, Semra Türkan, Helen Agasild, Didier L. Baho, Ulrike Scharfenberger, Josef Hejzlar, Eva Papastergiadou, Rita Adrian, David G. Angeler, Priit Zingel, Ayşe İdil Çakıroğlu, Arda Özen, Stina Drakare, Martin Søndergaard, Erik Jeppesen, Meryem Beklioğlu (2017): Effects of nutrient and water level changes on the composition and size structure of zooplankton communities in shallow lakes under different climatic conditions: a pan-European mesocosm experiment.  Aquatic Ecology, 51: 257–273
  • Darren P. Giling, Peter A. Staehr, Hans Peter Grossart, Mikkel René Andersen, Bertram Boehrer, Carmelo Escot, Fatih Evrendilek, Lluís Gómez-Gener, Mark Honti, Ian D Jones, Nusret Karakaya, Alo Laas, Enrique Moreno-Ostos, Karsten Rinke, Ulrike Scharfenberger, Silke R. Schmidt, Michael Weber, R. Iestyn Woolway, Jacob A. Zwart, Biel Obrador (2017): Delving deeper: Metabolic processes in the metalimnion of stratified lakes. Limnology and Oceanography, 62: 1288–1306
  • Soren Brothers, Garabet Kazanjian, Jan Köhler, Ulrike Scharfenberger, Sabine Hilt (2017): Convective mixing and high littoral production established systematic errors in the diel oxygen curves of a shallow, eutrophic lake. Limnology and Oceanography: Methods, 15: 429–435
  • Alena S. Gsell, Ulrike Scharfenberger, Deniz Özkundakci, Annika Walters, Lars-Ansers Hansson, Annette B. G. Janssen, Peeter Nõges, Philip C. Reid, Daniel E. Schindler, Ellen van Donk, Vasilis Dakos, Rita Adrian (2016): Evaluating early-warning indicators of critical transitions in natural aquatic ecosystems. PNAS, 113: E8089--E8095
  • Jan Coppens, Josef Hejzlar, Michal Šorf, Erik Jeppesen, Şeyda Erdoğan, Ulrike Scharfenberger, Aldoushy Mahdy, Peeter Nõges, Arvo Tuvikene, Didier L. Baho, Cristina Trigal, Eva Papastergiadou, Kostas Stefanidis, Saara Olsen, Meryem Beklioğlu (2016): The influence of nutrient loading, climate and water depth on nitrogen and phosphorus loss in shallow lakes: a pan-European mesocosm experiment. Hydrobiologia, 778: 13–32
  • Aldoushy Mahdy, Sabine Hilt, Nur Filiz, Meryem Beklioğlu, Josef Hejzlar, Deniz Özkundakci, Eva Papastergiadou, Ulrike Scharfenberger, Michal Šorf, Kostas Stefanidis, Lea Tuvikene, Priit Zingel, Martin Søndergaard, Erik Jeppesen, Rita Adrian (2015): Effects of water temperature on summer periphyton biomass in shallow lakes: a pan-European mesocosm experiment. Aquatic Sciences, 77: 499–510
  • Didier L. Baho, Ülkü Nihan Tavşanoğlu, Michal Šorf, Konstantinos Stefanidis, Stina Drakare, Ulrike Scharfenberger, Helen Agasild, Meryem Beklioğlu, Josef Hejzlar, Rita Adrian, Eva Papastergiadou, Priit Zingel, Martin Søndergaard, Erik Jeppesen, David G. Angeler (2015): Macroecological Patterns of Resilience Inferred from a Multinational, Synchronized Experiment. Sustainability, 7: 1142–1160
  • Aldoushy Mahdy, Ulrike Scharfenberger, Rita Adrian, Sabine Hilt (2015): Experimental comparison of periphyton removal by chironomid larvae and Daphnia magna. Inland Waters, 5: 81–88
  • Frank Landkildehus, Martin Søndergaard, Meryem Beklioğlu, Rita Adrian, David G. Angeler, Josef Hejzlar, Eva Papastergiadou, Priit Zingel, Ayşe İdil Çakıroğlu, Ulrike Scharfenberger, Stina Drakare, Tiina Nõges, Michal Šorf, Konstantinos Stefanidis, Ülkü Nihan Tavşanoğlu, Cristina Trigal, Aldoushy Mahdy, Christina Papadaki, Lea Tuvikenek, Søren E. Larsen, Martin Kernan, Erik Jeppesen (2014): Climate change effects on shallow lakes: design and preliminary results of a cross-European climate gradient mesocosm experiment. Estonian Journal of Ecology, 63: 71–89
  • Danijela Markovic, Ulrike Scharfenberger, Stefan Schmutz, Florian Pletterbauer, Christian Wolter (2013): Variability and alterations of water temperatures across the Elbe and Danube River Basins. Climatic Change, 119: 375–389