Project Team
Dr. Sonja Jähnig - Researcher / Group Leader
Dr. Sonja Jähnig

Dr. Sonja Jähnig is research group leader at the Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB, Berlin), Department of Ecosystem Research. She holds a Diploma in Environmental Sciences and a PhD from University of Duisburg-Essen. Her research focuses on global change effects in river ecosystems, large scale patterns of freshwater biodiversity and river health, and traits and functions in river ecosystems. Sonja is and has been actively involved in a number of European and international projects funded e.g. by the DFG and BMBF (current: GLANCE), especially interested at the interface of hydrology and hydrobiology. In the Project AQUACROSS she is currently leading the work package 7 - Forecasting Biodiversity and Ecosystem Service Provision and is additionally involved into the WP 3, 4, 5 and 8.

 

Main research interests

  • Global change effects in river ecosystems
  • Large scale patterns in freshwater biodiversity and river health
  • Traits and functions in river ecosystems

Contact

T. +49 (0) 30 6392 4085

IGB, Justus-von-Liebig-Str. 7, 12489 Berlin

IGB Webpage Profile

Dr. Jens Kiesel - Researcher
Dr. Jens Kiesel

Dr. Jens Kiesel is a Postdoc in the group of Dr. Sonja Jähnig. His main research interests are the simulation of hydrological, hydraulic and ecological processes in freshwater streams. He works on linking these components on different scales for simulating aquatic ecosystems. In the project GLANCE he is investigating the effects of global change on hydrologic and hydraulic processes.

 

Contact

T. +49 (0) 30 6392 4086

IGB, Justus-von-Liebig-Str. 7, 12489 Berlin

IGB Webpage Profile

Katherine Irving - PhD student
Katherine Irving

Title of work: Improvement of Global Change Projections for Benthic Invertebrates

The primary focus is to further develop the predictive ability of Species Distribution Models for riverine benthic macro invertebrates.

  • The work aims to determine benthic macro invertebrate sensitivity to certain environmental conditions, the outcome of which will lead to a species-focused integration of the most influencing factors on distributional range.
  • The application of future projections of extreme hydrological events as well as land-use, will provide a more detailed depiction of river ecosystems leading to more conclusive estimates of benthic macro invertebrate range shifts.

"Understanding the drivers of benthic macro invertebrate distribution will be instrumental in aiding future management decisions and the mitigation of global change in rivers. The results of this study will further our ecological knowledge of benthic river communities under the influence of global change while also improving the predictive power of Species Distribution Models."

Contact


IGB, Justus-von-Liebig-Str. 7, 12489 Berlin

IGB Webpage Profile

Karan Kakouei - Reearcher (former PhD student)
Karan Kakouei

Title of work: Determination and quantification of flow traits of benthic invertebrates in running water systems

Although, the discharge of many rivers is expected to be decreasing worldwide due to climate change, surprisingly little empirical knowledge is available on the ecological requirements of benthic invertebrates living in these ecosystems. Being rather descriptive, these ecological traits are of limited value to quantify effects of changes in flow. Hence, we aimed to determine quantitative preferences of lotic invertebrates regarding flow conditions (“flow traits”) for Central Europe.

 

For that, we gathered two datasets:

  1. Long-term hydrological data recorded at 365 gauging stations in Germany: Hydrological data were characterized by 10 selected hydrological indices, providing information on magnitude, timing, duration, rate and frequency of changes in flow.
  2. Results from benthic invertebrate samples (774 sites) of Germany's rivers and streams.

By using hierarchical logistic regression modelling, we then identified invertebrate preferences for a variety of hydrological conditions, e.g. min./max./optimum response values for individual taxa.

"The results of this analysis enable a quantitative description of taxa responses to flow alteration, which represent valuable information for ecological modelling and predicting impacts of flow changes."

Contact

T. +49(30) 64181 690

IGB, Müggelseedamm 301, 12587 Berlin

IGB Webpage Profile

Martin Friedrichs - PhD student
Martin Friedrichs

Species distribution models play an increasingly important role in modern nature conservation management as well as for effective nature conservation planning. SDMs allow estimations of the potential spatial distribution of species on large spatial scales. To make reliable use of predictions for nature conservation management and planning, it is necessary to record and minimise potential uncertainties. I am assessing the uncertainties in future distribution range predictions for fish species in river ecosystems using species distribution models. Especially, I focus on uncertainties arising from the modelled spatial (sub-basin size) and temporal scale (timeframe of species distribution data used). The overall aim is to use the gained knowledge to create nature conservation networks according to predicted species range shifts.

 

Title of work: Uncertainties in species distribution models: effects of spatial and temporal scales on future predictions

Contact

T. +49 (0) 6392 4098

IGB, Justus-von-Liebig-Str. 7, 12489 Berlin

IGB Webpage Profile

Annett Wetzig - Technician
Annett Wetzig

Technician

 

Contact

T. +49(30) 6392 4087

IGB, Justus-von-Liebig-Str. 7, 12489 Berlin

IGB Webpage Profile