About me

New paper is out: R. Ladwig, A. Appling, A. Delany, H. Dugan, Q. Gao, N. Lottig, J. Stachelek, P. Hanson, Long-term change in metabolism phenology in north temperate lakes, Limnology & Oceanography (2022). Check it out here.


Welcome, my name is Robert. I am a computational limnologist with a keen interest in aquatic ecosystem modeling, physical limnology, aquatic ecology and theory-guided data science. I am a co-founder and member of the organisational team for Hacking Limnology, which is a global community that each years hosts a venue with the aim to bring together a diverse array of aquatic scientists, who are all interested in data-intensive techniques.

I am a Postdoctoral Research Fellow at the Center for Limnology at the University of Wisconsin-Madison advised by Hilary Dugan and Paul Hanson working on simulating aquatic ecosystems using GLM-AED2. My research focuses on how physical and biogeochemical process can influence an aquatic ecosystem’s biology and ecosystem function by taking advantage of cutting-edge data-intensive and computationally demanding techniques. My current research focuses on understanding the impact of drivers on long-term aquatic ecosystem dynamics, developing open-access scientific software and tools, and improving ecological modeling code and algorithms built on state-of-the-art Biological theory.

My current research interests in a nutshell:

  • lake phenology (i.e., stratification and ice dynamics, lake metabolism, phytoplankton succession):
    • long-term dissolved oxygen depletion and metabolism dynamics in lakes (metabolism phenology, anoxia in Lake Mendota, metalimnetic oxygen minimum)
    • investigating the impact of climate change on future lake mixing dynamics (Lake Tegel, Global ensemble analysis)
    • integrating stochastic processes into deterministic models, e.g. to improve simulations of phytoplankton bloom dynamics
  • sustainable water resources management:
  • aquatic ecosystem modeling:


I did my PhD work at the Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB) in Berlin, Germany, supervised by Michael Hupfer and Reinhard Hinkelmann. Here, I studied the impact of multiple stressors on urban lakes using field sampling, monitoring and numerical modeling (e.g. vertical 1D GLM-AED2, vertical 1D FLake, depth-averaged 2D open TELEMAC-MASCARET).

Here is an overview of some of my software projects:

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