Aquatic ecosystems are intrinsically complex because they have a network structure and nonlinear processes often take place at various spatial and temporal scales. Nonlinear reactions can occur, for example, as a result of perturbations that trigger a so-called regime shift, such as prolonged drought. Important determinants of complex aquatic ecosystems are the landscape structure in which the water bodies are located and the connectivity, i.e. the interconnection of the water bodies at different levels: These include the flows of water, energy, information, nutrients and pollutants, and the dispersal of organisms. These processes determine the structure and dynamics of ecosystems and are changed over time by external factors such as land use and climate change.
In the programme area “Dimensions of complexity of aquatic systems”, IGB aims to gain a better understanding of the dynamics and functioning of aquatic systems and the living organisms within them. Its overall goal is to enhance our mechanistic understanding on how freshwater ecosystems function and to study their spatial and temporal scaling. An important focus is on the interfaces and interactions between terrestrial and aquatic habitats, between sediment and the water column, between water and air, and between and within organisms.
Speakers
News
Downloads
Selected publications
Interactions between climate change and urbanization will shape the future of biodiversity
The study shows how interactions between climate change and urbanisation affect biodiversity and ecosystem dynamics. The authors point out that the interactions between these two drivers of global change can have far-reaching effects, and how this knowledge can inform urban planning.
Quantifying intra- and inter-annual dynamics of river-floodplain connectivity and wetland inundation with remote sensing and wavelet analysis
The authors used remote sensing data and wavelet analysis to quantify dynamics in floodplain inundation and riverfloodplain connectivity in the Lower Oder Valley National Park. They found marked inter-annual variation of wetland inundation. Heavy precipitation caused summer flooding in only one polder. This information is important for managing flows and sustaining valuable wetland habitats.
Six decades of ecohydrological research connecting landscapes and riverscapes in the Girnock Burn, Scotland: Atlantic salmon population and habitat dynamics in a changing world
Six decades of ecological monitoring provided the science needed to preserve Atlantic salmon. The unique long-term data revealed quantitative changes in the return rates, distribution, size, growth and age of salmon, increasing understanding on how ecosystems are changing in response to a warming climate.
Assessing impacts of alternative land use strategies on waterpartitioning, storage and ages in drought-sensitive lowlandcatchments using tracer-aided ecohydrological modelling
The authors used advanced process-based ecohydrological modelling to assess the effects of realistic land use scenarios for the Berlin/Brandenburg region on water flux and storage dynamics. Replacing conifer forests with uneven-aged mixed forests with younger, broad-leaved trees had the greatest potential for reducing evapotranspiration and increasing groundwater recharge
Hydrological model skills change with drought severity; insights from multi-variable evaluation
The study investigated the ability of the Continuum hydrological model in simulating the water cycle in the Po river basin (Italy) during droughts of increasing severity. The simulation of streamflow during the severe 2022 drought was characterized by comparatively lower performances than during moderate events, most likely due to challenges in representing high human influences via irrigation.