Inst. Ökologie

175 Items

Recent Submissions
Electron & Biomass Dynamics of Cyanothece Under Interacting Nitrogen & Carbon Limitations

Rabouille, Sophie ; Campbell, Douglas A. ; Masuda, Takako ; Zavřel, Tomáš ; Bernát, Gábor ; Polerecky, Lubos ; Halsey, Kimberly ; Eichner, Meri ; Kotabová, Eva ; Stephan, Susanne ; Lukeš, Martin ; Claquin, Pascal ; Bonomi-Barufi, José ; Lombardi, Ana Teresa ; Červený, Jan ; Suggett, David J. ; Giordano, Mario ; Kromkamp, Jacco C. ; Prášil, Ondřej (2021-04-09)

Marine diazotrophs are a diverse group with key roles in biogeochemical fluxes linked to primary productivity. The unicellular, diazotrophic cyanobacterium Cyanothece is widely found in coastal, subtropical oceans. We analyze the consequences of diazotrophy on growth efficiency, compared to NO3–-supported growth in Cyanothece, to understand how cells cope with N2-fixation when they also have to...

Interaction of traffic intensity and habitat features shape invasion dynamics of an invasive alien species (Ambrosia artemisiifolia) in a regional road network

Lemke, Andreas ; Buchholz, Sascha ; Kowarik, Ingo ; Starfinger, Uwe ; Lippe, Moritz von der (2021-03-24)

Road corridors are important conduits for plant invasions, and an understanding of the underlying mechanisms is necessary for efficient management of invasive alien species in road networks. Previous studies identified road type with different traffic volumes as a key driver of seed dispersal and abundance of alien plants along roads. However, how the intensity of traffic interacts with the hab...

Atmosphere Driven Mass-Balance Sensitivity of Halji Glacier, Himalayas

Arndt, Anselm ; Scherer, Dieter ; Schneider, Christoph (2021-03-26)

The COupled Snowpack and Ice surface energy and mass balance model in PYthon (COSIPY) was employed to investigate the relationship between the variability and sensitivity of the mass balance record of the Halji glacier, in the Himalayas, north-western Nepal, over a 40 year period since October 1981 to atmospheric drivers. COSIPY was forced with the atmospheric reanalysis dataset ERA5-Land that ...

Do earthworms (D. veneta) influence plant-available water in technogenic soil-like substrate from bricks and compost?

Ulrich, Susanne ; Willaredt, Moreen ; Nehls, Thomas ; van Schaik, Loes (2020-09-15)

Purpose: Topsoil and peat are often taken from intact rural ecosystems to supply the urban demand for fertile soils and soil-like substrates. One way of reducing this exploitation is to recycle suitable urban wastes to produce Technosols and technogenic soil-like substrates. In this study, we investigate the role earthworms can play in impacting the hydraulic properties of such a soil-like subs...

Seasonality and spatial variability of dynamic precipitation controls on the Tibetan Plateau

Curio, Julia ; Scherer, Dieter (2016-09-20)

The Tibetan Plateau (TP) is the origin of many large Asian rivers, which provide water resources for large regions in south and east Asia. Therefore, the water cycle on the TP and adjacent high mountain ranges, in particular the precipitation distribution and variability play an important role for the water availability for billions of people in the downstream regions of the TP. The High Asia ...

A 12-year high-resolution climatology of atmospheric water transport over the Tibetan Plateau

Curio, Julia ; Maussion, Fabien ; Scherer, Dieter Ernst (2015-03-13)

The Tibetan Plateau (TP) plays a key role in the water cycle of high Asia and its downstream regions. The respective influence of the Indian and East Asian summer monsoon on TP precipitation and regional water resources, together with the detection of moisture transport pathways and source regions are the subject of recent research. In this study, we present a 12-year high-resolution climatolog...

The fate of silver nanoparticles in riverbank filtration systems — The role of biological components and flow velocity

Degenkolb, Laura ; Leuther, Frederic ; Lüderwald, Simon ; Philippe, Allan ; Metreveli, George ; Amininejad, Sayed ; Vogel, Hans-Jörg ; Kaupenjohann, Martin ; Klitzke, Sondra (2019-09-10)

Riverbank filtration is a natural process that may ensure the cleaning of surface water for producing drinking water. For silver nanoparticles (AgNP), physico-chemical interaction with sediment surfaces is one major retention mechanism. However, the effect of flow velocity and the importance of biological retention, such as AgNP attachment to biomass, are not well understood, yet. We investiga...

Retention and remobilization mechanisms of environmentally aged silver nanoparticles in an artificial riverbank filtration system

Degenkolb, Laura ; Metreveli, George ; Philippe, Allan ; Brandt, Anja ; Leopold, Kerstin ; Zehlike, Lisa ; Vogel, Hans-Jörg ; Schaumann, Gabriele E. ; Baumann, Thomas ; Kaupenjohann, Martin ; Lang, Friederike ; Kumahor, Samuel ; Klitzke, Sondra (2018-07-17)

Riverbank filtration systems are important structures that ensure the cleaning of infiltrating surface water for drinking water production. In our study, we investigated the potential risk for a breakthrough of environmentally aged silver nanoparticles (Ag NP) through these systems. Additionally, we identified factors leading to the remobilization of Ag NP accumulated in surficial sediment laye...

Transport and retention of differently coated CeO2 nanoparticles in saturated sediment columns under laboratory and near-natural conditions

Degenkolb, Laura ; Dippon, Urs ; Pabst, Silke ; Klitzke, Sondra (2019-04-08)

Where surface-functionalized engineered nanoparticles (NP) occur in drinking water catchments, understanding their transport within and between environmental compartments such as surface water and groundwater is crucial for risk assessment of drinking water resources. The transport of NP is mainly controlled by (i) their surface properties, (ii) water chemistry, and (iii) surface properties of ...

Investigation of water retention functions of artificial soil-like substrates for a range of mixing ratios of two components

Willaredt, Moreen ; Nehls, Thomas (2020-08-04)

Purpose: Urban greening is politically fostered as an adaptation strategy to climate change. Therefore, the demand for fertile planting substrates increases. Such substrates are usually mixed from mined geogenic resources but should rather be produced from recycled materials. Furthermore, their hydraulic properties should be designed according to their application, e.g., by optimizing the mixin...

Herbert Sukopp – an inspiring pioneer in the field of urban ecology

Kowarik, Ingo (2020-03-24)

Urban ecology is a well-established integrative discipline with many historical roots. One of the eminent pioneers of urban ecology is the German ecologist Herbert Sukopp, who works in Berlin since the late 1950s and is often referred to as the founder of the "Berlin School of Urban Ecology". On the occasion of his 90th anniversary in 2020, this paper aims to recognize and commemorate the major...

New methods of spatial analysis in urban gardens inform future vegetation surveying

Egerer, Monika H. ; Wagner, Benjamin ; Lin, Brenda B. ; Kendal, Dave ; Zhu, Kai (2020-02-10)

Context: Land use change requires measuring shifting patterns in biodiversity at various spatial scales to inform landscape management. Assessing vegetation change at different scales is challenging in urban ecosystems managed by many individuals. Thus, we do not know much about the structure and function of green spaces that support biodiversity. Objective: We aim to understand how vegetation ...

Functional ecology of wild bees in cities: towards a better understanding of trait-urbanization relationships

Buchholz, Sascha ; Egerer, Monika H. (2020-06-08)

A functional ecological understanding of urban wild bee communities is of growing importance especially in regard to biodiversity conservation, ecosystem service maintenance and effective conservation programmes. In this paper, we review and summarize the published literature aiming to inform future research investigations in the growing field of wild bee functional ecology. Specifically, we: (...

Mono-specific forest plantations are valuable bat habitats: implications for wind energy development

Buchholz, Sascha ; Kelm, Volker ; Ghanem, Simon J. (2020-12-03)

Near-natural or semi-natural forests such as relatively undisturbed and old deciduous or mixed woodland are considered worth protecting and ecologically valuable habitats for bat conservation. In contrast, mono-specific forest plantations are considered ecologically less valuable; thus, decision-makers recommend these plantations as suitable locations for wind power stations and therefore want ...

Defining the baseline for river restoration: comparing carabid beetle diversity of natural and human-impacted riparian habitats

Sprößig, Claudia ; Buchholz, Sascha ; Dziock, Frank (2020-07-15)

Near-natural rivers and riparian ecosystems can represent biodiversity hotspots harbouring many highly specialised, rare and endangered species. During the past centuries, these habitats have been heavily degraded by anthropogenic use, and therefore river restoration is one of the most striking fields of action that is legally defined by the European Union Water Framework Directive. Successful ...

Water dynamics at the urban soil-atmosphere interface—rainwater storage in paved surfaces and its dependence on rain event characteristics

Nehls, Thomas ; Peters, Andre ; Kraus, Fabian ; Rim, Yong Nam (2020-08-28)

Purpose: The surface store governs the rainwater partition, e.g., water storage and evaporation on paved surfaces, especially for low-intensity and low-sum rain events, which account for the greatest part of the total rainfall in a temperate climate city like Berlin, Germany. The surface store S is a fixed value, dependent on surface relief and pore system characteristics. Contrary, in this stu...

Nitrogen mineralization in soils of tropical climates - concepts, experiments and implications for modelers

Melzer, Dennis (2021)

The microbial release of nitrogen (N) from soil organic matter (SOM) is the underlying process for plant growth in many terrestrial soils. The prediction of the N background supply also determines the quality of agricultural simulation models. Nevertheless, the progress in the theoretical understanding of SOM are only gradually translated into new modeling approaches. For example, N release dyn...

Temporal Patterns and Intra- and Inter-Cellular Variability in Carbon and Nitrogen Assimilation by the Unicellular Cyanobacterium Cyanothece sp. ATCC 51142

Polerecky, Lubos ; Masuda, Takako ; Eichner, Meri ; Rabouille, Sophie ; Vancová, Marie ; Kienhuis, Michiel V. M. ; Bernát, Gabor ; Bonomi-Barufi, Jose ; Campbell, Douglas Andrew ; Claquin, Pascal ; Červený, Jan ; Giordano, Mario ; Kotabová, Eva ; Kromkamp, Jacco ; Lombardi, Ana Teresa ; Lukeš, Martin ; Prášil, Ondrej ; Stephan, Susanne ; Suggett, David ; Zavřel, Tomas ; Halsey, Kimberly H. (2021-02-04)

Unicellular nitrogen fixing cyanobacteria (UCYN) are abundant members of phytoplankton communities in a wide range of marine environments, including those with rapidly changing nitrogen (N) concentrations. We hypothesized that differences in N availability (N2 vs. combined N) would cause UCYN to shift strategies of intracellular N and C allocation. We used transmission electron microscopy and n...

Three-Dimensional Mapping of Forest Soil Carbon Stocks Using SCORPAN Modelling and Relative Depth Gradients in the North-Eastern Lowlands of Germany

Russ, Alexander ; Riek, Winfried ; Wessolek, Gerd (2021-01-13)

To cope with the challenges in forest management that are contemporarily caused by climate change, data on current chemical and physical soil properties are more and more necessary. For this purpose, we present a further amalgam of depth functions and SCORPAN modelling to provide data at arbitrary depth layers. In this concept, regionalisation is split up into the modelling of plot totals and t...

Mobility and transport mechanisms of engineered nanoparticles in soils and water-saturated sediments

Degenkolb, Laura (2021)

Due to their promising and unique properties, nanoparticles (NP) are increasingly being used in industry and in everyday products. Their special properties are based on their size of less than 100 nm and the associated large surface area and high reactivity. If released into the environment during production or use, they may pose a risk to ecosystems and living organisms. For this reason, their...