Dr. Thomas Petzoldt Scientist, Staff Member (Limnology and Ecologcal Modelling) Institute of Hydrobiology Workgroup Limnology Address TU Dresden Institute of Hydrobiology Helmholtzstr. 10 01069 Dresden Location: Zellescher Weg 40 (Drudebau) Tel. +49 351 463 34954 Fax +49 351 463 37108 thomas.petzoldt@tu-dresden.de

Field work ...

Curriculum Vitae

• 1983 - 1988: study of biology at Rostock University and Dresden University of Technology
• Diploma degree: Statistical data analysis and Monte Carlo simulation with the lake model SALMO
• 1988 - 1996: Scientist and "computer person" at the Institute of Hydrobiology
• 1996: PhD about Possibilities of phytoplankton prediction with different models approaches
  
• Since 1996: Scientist at the Institute of Hydrobiology: teaching, research projects, computer network administrator

Teaching

• Applied Computing
  
• Applied Statistics
  
• Ecological Systems Analysis

... and together with other people:

• Basic course in Hydrobiologcy
  
• Advanced courses in Hydrobiology Part I  and Part III
  
• Hydrobiological Excursions
  
• Ecology and systematics of water organisms Part I  and Part II
  
• Field course "Lake Limnology"

Research Topics

• Process models for hypothesis testing in limnology (differential equations and individual based models)
• Role of reservoirs within catchment areas (joint project "Spree")
• Model simplification and module construction using empirical rules and artificial neural networks
• Individual based simulation of diurnal vertical migration and population dynamics of Daphnia (together wih Karsten Rinke)
• Decision support for water quality management of lakes and reservoirs with the ecological lake model SALMO
• Development of an hydrophysical-ecological coupled reservoir model system (Joint Project GETAS)
• Integrated management of multi-purpose drinking water reservoirs (Joint Project IntegTa)
• Model-aided analysis of climate impacts on planktonic food webs based on long-term data of the Saidenbach Reservoir (wihtin the DFG Priority Programme AQUASHIFT)
  

==> More info about ongoing projects (abstracts, staff, details)

Committees and Memberships

• member of the study commission of the department of hydrosciences,
  
• member of the German Limnological Society (DGL), the International Society of Limnology (SIL) and of the R Foundation for Statistical Computing (R Foundation),
• working group member of the German Drinking Water Reservoir Management Group (ATT),
  
• Associate Editor of the "Journal of Statistical Software" (JSS), Reviewer for different international limnological and ecological journals.
  

Publications

My List guest editor of the JSS special volume "R in Ecology and Ecological Modelling" (together with Thomas Kneib), guest editor of a special issue for Limnologica (together with Stephan Hülsmann, Susanne Rolinski and Sabine Jähnichen), more publications of the workgroup limnology.

Tutorials, Tools und Downloads

Almost all packages are results of collaborative work with other first authors or co-authors, please consult the package description for details.

• R package simecol (Ecological models: differential equations, individual-based, spatially explicit, ...)
• the PDF of the corresponding publication is freely available
  
• R package qualV  (qualitative model validation criteria)
• the PDF of the corresponding publication is freely available
• R package cardidates (peak-fitting and determination of "cardinal dates" in phytoplankton time series)
• with quickstart manual (PDF)
  
• R package proto
  
• prototype based, class-free object oriented programming in R
  
• sourcecode, manuals (PDF 1 , PDF 2) and project-homepage: http://code.google.com/p/r-proto/ 
  
• download binary from CRAN: http://cran.r-project.org/src/contrib/Descriptions/proto.html
• Other R packages dedicated to modelling dynamic systems
  
• contributions to R package deSolve  for solving differential equation models
• packages FME (flecible modelling environment) marelac (tools for marine and lacustrine sciences) and more ...
• http://r-forge.r-project.org/users/petzoldt/ 
  

• Modelling for Limnologists with R (in German):
• short introductory R tutorial (in German): First_Rsession.pdf
  
• construction of ecological models with R (in German): modlim.pdf 
• data sets (please read README.TXT and respect *.info files)
  
• small models  (please respect README.TXT)