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Department Head: 

Prof. Dr. Alexandra-Maria Klein
phone:+49 (0)761 203-67770



Mrs. Ilona Winkler
phone:+49 (0)761 203-3635
fax:+49 (0)761 203-3638


Chair of Nature Conservation
& Landscape Ecology
University of Freiburg
Tennenbacher Str. 4
D-79106 Freiburg




Dr. Nick Rosenberger

Nick Rosenberger


Nick Rosenberger
Web of Science ResearcherID: GAQ-2494-2022
phone: +49 (0) 761 203 -3643
Room-No. 501



 I am a broadly trained ecologist that uses floral reproduction, pollination, and mutualisms to understand how global change drivers (specifically climate change and biological invasions) are influencing persistence of species and how these changes reshape ecological communities. I fundamentally want to understand what future ecological communities will look like and what mechanisms govern their structure and transience.

For my masters research in Patagonia I studied how the invasive bumble bee Bombus terrestris disrupted the interaction of the native bumble bee Bombus dahlbomii and diminished its pollination of a native plant (Fuchsia magellanica) through nectar robbing. My work demonstrated that replacing a species interaction with a similarly related species (same genus) does not replace mutualism.

For my PhD research I aimed to understand the constraints that extreme heat imposes on the dynamics of pollination and plant-pollinator interactions. All organisms have a maximum temperature that they can tolerate and range of temperatures they can function within. However, Flowers are highly sensitive to heat and especially so during development. When flowers develop during heat, they produce less nectar and pollen, and the quality of their pollen and ovules diminishes. This creates a catch 22: there is higher demand for pollinators (more visitation needed),  but there are less resources to attract pollinators (less pollen and nectar) and those pollinators must also forage in extreme heat. I found that extreme heat limits pollination and pollinator foraging, and heat’s qualitative effects on pollen and ovules causes insufficient pollination to overcome pollen limitation.

I hope to integrate these lessons of what I have learned into my work at the Chair of Nature Conservation and Landscape Ecology where I will work on the EU project RestPoll, where we aim to restore pollinator habitats in agricultural landscapes. We will need to design habitat restoration efforts that are climate resilient so that our efforts both restore and sustain biodiversity in Europe well into the future.



Since 05/2024
Postdoc at Chair of Nature Conservation and Landscape Ecology, Faculty of Environment and Natural Resources, University of Freiburg
09/2020 - present UC Davis Jastro-Shields Research Scholarship
2016 - 2024 PhD in Ecology, University of California, Davis
2018 - 2023 Teaching Assistant, University of California, Davis
10/2021 - 09/2022
DAAD research scholarship at Chair of Nature Conservation and Landscape Ecology, Faculty of Environment and Natural Resources, University of Freiburg
09/2018 - 12/2020
Graduate Group in Ecology Fellowship, University of California, Davis
2016 - 2018
MSc in Ecology, University of Calgary  
2016 - 2017 Teaching Assistant, University of Calgary
09/2016 - 12/2016
Entrance Scholarship, University of Calgary
11/2015-5/2016 National Geographic Society Young Explorer’s Grant
2011 - 2014
BSc in Wildlife Biology with Honors, University of Montana, Missoula
08/2013 - 05/2014
Richard F. Johnson Memorial Scholarship, University of Montana
01/2011 - 05/2014
Leadership and Service Award, University of Montana
05/2013 - 09/2013 NSF EPSCoR Undergraduate Research Award
05/2013 - 09/2013 Irene Evers Undergraduate Research Scholarship
05/2013 Climate Change Studies Summer Award, selected for, not funded 
08/2012 - 05/2013

Christian Bowers Memorial Scholarship, University of Montana

08/2011 - 12/2011
Teaching Assistant, University of Montana





































  • Hemberger, J.A., Rosenberger, N.M. & Williams, N.M. (2023): Experimental heatwaves disrupt bumblebee foraging through direct heat effects and reduced nectar production. Functional Ecology 37: 591-601. Link 

  • Rosenberger, N.M., Aizen, M.A., Dickson, R.G. & Harder, L.D. (2022):  Behavioral responses by a bumble bee to competition with a niche-constructing congener. Journal of Animal Ecology 91: 580-592.

  • Page, M.L., Nicholson, C.C., Brennan, R.M., Britzman, A.T., Greer, J., Hemberger, J., Kahl, H., Müller, U., Peng, Y., Rosenberger, N.M., Stuligross, C., Wang, L., Yang, L.H., & Williams, N.M. (2021): A metaanalysis of single visit pollination effectiveness comparing honeybees and other floral visitors. American Journal of Botany 108: 2196-2207.

  • Williams, N.M, Mola, J.M., Stuligross, C., Harrison, T., Page, M.L., Brennan, R.M., Rosenberger, N.M. & Rundlöf, M. (2019): Fantastic bees and where to find them: locating the overwintering queens of a western bumble bee. Ecosphere 10:e02949.

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