Sebastian | Research | CV | Misc | Imprint |
The aim of this project is to better determine and understand the
influence of different landscape characteristics on biodiversity.
The idea is to develop a spatially explicit multi-species simulation
model with stochastic birth, death and dispersal processes. The
empirical basis for the model is previously collected data on different
taxonomic groups of invertebrates in agricultural landscapes.
Status: Current project. For starters we simulate ground-beetle
populations on artificial landscapes where we can completely control
the landscape measures like landscape configuration and composition.
Cooperations: Katrin Meyer, Teja Tscharntke, Kerstin Wiegand
Fairy circles are circular bare patches that form strikingly regular patterns over huge areas.
They occur in the millions in parts of Namibia, South Africa and Angola.
Despite years of research, the origin of the fairy circles still remains unclear.
With our fairy circle simulation model, we aim to identify and understand processes
that may cause the genesis and maintenance of fairy circles based on
spatial self organization.
Status: Current project. Bachelor thesis of Theresa Möller-Lindenhof: Ecological drivers of fairy circle patterns in dryland vegetation (supervision together with Stephan Getzin and Katrin Meyer).
Cooperations: Stephan Getzin, Katrin Meyer, Kerstin Wiegand
Land degradation and desertification are serious threads to extensively farmed arid and
semiarid savanna rangelands. Land degradation processes such as bush encroachment
and loss in vegetation cover are strongly influenced by the applied farming practice, but
it is very difficult to identify the actual causes and effects in such complex ecosystems.
Computer simulation models can be valuable tools to help to better understand the complex processes of rangeland
dynamics under different management scenarios.
During my diploma thesis we developed a spatially explicit, grid-based based rangeland simulation model which allows simulations on real landscape data. The model is able to resemble vegetation patterns as the formation of a specific sequence of vegetation types along a gradient of different grazing intensity - a so-called piosphere. The model is adaptable for different management (i.e. stocking rate, livestock composition, camp rotation) and climatic scenarios (spatio-temporal precipitation pattern, temperature).
Status: Kick-off model for a follow-up project: IDESSA.
Cooperations: Klaus Kellner, Theunis Morgenthal, Kerstin Wiegand, Thorsten Wiegand
Tiger bush is a striped (or banded) vegetation pattern that is caused by
local facilitation and not-only-local competition for water. It occurs on
slight slopes and the vegetation bands are parallel to the contour lines.
The idea of this model is to make the slope variable and include
adjacent ecotopes without slope to better understand the development (and conservation) of tiger bush.
The model is based on the TIGREE-model.
Status: This model was part of a term paper during my studies in mathematical biology in Jena.