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Microorganisms help to keep the water of lakes clean. In the process, they also detoxify the nitrogen compound ammonium, which is introduced into water bodies by fertilizers, for example, and is also produced naturally by metabolic processes. An international team led by the German Collection of Microorganisms and Cell Cultures (DSMZ) with IGB researchers Hans-Peter Grossart and Danny Ionescu has now shown that this detoxification of ammonium in the depths of European lakes is only sustained by an extremely small number of specific archaebacteria species.

Urbanization goes hand in hand with a considerable sealing of soils. About 20 percent of the newly sealed area is not in urban areas, but in rural areas. However, calculations of nutrient fluxes into water bodies have not taken these new sealings in rural areas into account, because these are often based on land use maps and consider urban areas.

As an international, science-based organisation, GEO AquaWatch is dedicated to the global observation of freshwater and marine systems. Since 2022, the organisation has been having a new node at IGB to drive the calibration and validation of satellite data. 

Happy Birthday LakeLab! For a decade now, IGB has been conducting large-scale experiments on the impacts of climate change and other anthropogenic environmental changes on lake ecosystems at the IGB LakeLab in Lake Stechlin. In this brief interim account, we present the projects, scientific findings and new perspectives that have emerged from research conducted in the facility so far. It is a journey through time on the occasion of the first big anniversary.

Routine fishing on 29 November this year was the first large inventory conducted in the middle of the Oder since the man-made environmental disaster that occurred in summer. The result: much fewer fish were caught in total, and species such as the blue bream and the asp, which are important to this ecosystem, were lacking completely. Moreover, water analysis conducted by the researchers shows that the salt concentration is still far too high. There could be a repeat of the disaster when temperatures increase, endangering remaining stocks.

Rutynowe połowy 29 listopada br. były pierwszą poważną inwentaryzacją w środkowym biegu Odry po spowodowanej przez człowieka katastrofie ekologicznej w lecie. Efekt: ogólnie złowiono znacznie mniej ryb, a gatunki ważne dla tego ekosystemu, takie jak rozpiór i boleń, były zupełnie nieobecne. Z analiz wody przeprowadzonych przez badaczy wynika również, że stężenie soli jest nadal wyraźnie za wysokie. Wraz ze wzrostem temperatur katastrofa może się powtórzyć, co spowoduje zagrożenie dla ryb, które przeżyły.

IGB has provided feedback on the government draft of the National Water Strategy, emphasising, among other things, the relevance of aquatic biodiversity and the large practical implementation deficit in water management.

Alexander Sukhodolov has been carrying out a research on the Tagliamento River in the north-east of Italy for almost a decade and a half. Scientists are fascinated by this river because it has a number of features that makes it a unique object of study. IGB operates a River Lab at the Tagliamento, where researchers study river hydrodynamics and its effect and interactions with aquatic biota.