TY - CHAP A1 - Elmer, Michael A1 - Biemelt, Detlef A1 - Gerwin, Werner A1 - Hoberg, Karin A1 - Kleeberg, Andreas A1 - Lessmann, Dieter A1 - Schaaf, Wolfgang A1 - Schneider, Anna A1 - Zaplata, Markus Klemens A1 - Hüttl, Reinhard F. ED - Elmer, Michael ED - Schaaf, Wolfgang ED - Biemelt, Detlef ED - Gerwin, Werner ED - Hüttl, Reinhard F. T1 - Conclusions T2 - The artificial catchment Chicken Creek - initial ecosystem development 2005-2010 KW - Hühnerwasser KW - Künstliches Wassereinzugsgebiet Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus-23730 SP - 145 EP - 153 PB - FZLB CY - Cottbus ER - TY - GEN A1 - Oprei, Anna A1 - Schreckinger, José A1 - Kholiavko, Tatiana A1 - Frossard, Aline A1 - Mutz, Michael T1 - Functional and structural recovery of stream biofilms at the habitat scale is based on the individual disturbance history T2 - Ergebnisse der Jahrestagung 2019 in Münster KW - metabolic activity Y1 - 2020 UR - https://www.dgl-ev.de/cms/upload/dokumente/Publikationen/2020__DGL_Ergebnisse_Muenster_2019_web.pdf SN - 978-3-9818302-4-8 SP - 216 PB - Eigenverlag der DGL CY - Essen ER - TY - GEN A1 - Risse-Buhl, Ute A1 - Hagedorn, Frank A1 - Dümig, Alexander A1 - Gessner, Mark O. A1 - Schaaf, Wolfgang A1 - Nii-Annang, Seth A1 - Gerull, Linda A1 - Mutz, Michael T1 - Dynamics, chemical properties and bioavailability of DOC in an early successional catchment T2 - Biogeosciences Y1 - 2013 U6 - https://doi.org/doi:10.5194/bg-10-4751-2013 SN - 1726-4189 VL - 10 SP - 4751 EP - 4765 ER - TY - GEN A1 - Chabbi, Abad A1 - Rumpel, C. A1 - Grootes, Pieter M. A1 - Gonzales-Perez, J. A. A1 - Delaune, R. D. A1 - Gonzales-Vila, F. A1 - Nixdorf, Brigitte A1 - Hüttl, Reinhard F. T1 - Lignite degradation and mineralization in lignite-containing mine sediment as revealed by 14C activity measurements and molecular analysis T2 - Organic Geochemistry Y1 - 2006 U6 - https://doi.org/10.1016/j.orggeochem.2006.02.002 SN - 0146-6380 VL - 37 IS - 8 SP - 957 EP - 976 ER - TY - GEN A1 - Schaaf, Wolfgang A1 - Bens, Oliver A1 - Fischer, Anton A1 - Gerke, Horst H. A1 - Gerwin, Werner A1 - Grünewald, Uwe A1 - Holländer, Hartmut M. A1 - Kögel-Knabner, Ingrid A1 - Mutz, Michael A1 - Schloter, Michael A1 - Schulin, Rainer A1 - Veste, Maik A1 - Winter, Susanne A1 - Hüttl, Reinhard F. T1 - Patterns and processes of initial terrestrial-ecosystem development T2 - Journal of Plant Nutrition and Soil Science N2 - Ecosystems are characterized as complex systems with abiotic and biotic processes interacting between the various components that have evolved over long-term periods. Most ecosystem studies so far have been carried out in mature systems. Only limited knowledge exists on the very initial phase of ecosystem development. Concepts on the development of ecosystems are often based on assumptions and extrapolations with respect to structure–process interactions in the initial stage. To characterize the effect of this initial phase on structure and functioning of ecosystems in later stages, it is necessary to disentangle the close interaction of spatial and temporal patterns of ecosystem structural assemblages with processes of ecosystem development. The study of initial, less complex systems could help to better identify and characterize coupled patterns and processes. This paper gives an overview of concepts for the initial development of different ecosystem compartments and identifies open questions and research gaps. The artificial catchment site “Chicken Creek” is introduced as a new research approach to investigate these patterns and processes of initial ecosystem development under defined boundary conditions. This approach allows to integrate the relevant processes with related pattern and structure development over temporal and spatial scales and to derive thresholds and stages in state and functioning of ecosystems at the catchment level. KW - soils KW - pedogenesis KW - vegetation succession KW - microbial succession KW - artificial catchment Y1 - 2011 U6 - https://doi.org/10.1002/jpln.201000158 SN - 1522-2624 VL - 174 IS - 2 SP - 229 EP - 239 ER - TY - GEN A1 - Oprei, Anna A1 - Schreckinger, José A1 - Kholiavko, Tatiana A1 - Frossard, Aline A1 - Mutz, Michael A1 - Risse-Buhl, Ute T1 - Long-term functional recovery and associated microbial community structure after sediment drying and bedform migration T2 - Frontiers in Ecology and Evolution N2 - Climate change and erosion from agricultural areas cause increased drying periods and bedform migration of riverbeds, respectively, worldwide. Both sediment drying and bedform migration can independently stress the microbial community residing in the riverbed. Here, we investigated the microbial response after exposure to these stressors with a focus on long-term recovery. We conducted an in situ experiment to investigate the long-term (8 months) functional and structural recovery of benthic microbial communities from either sediment drying (episodic severe stressor) or bedform migration (frequent moderate stressor). Stressed sediment associated communities were rewetted (dried sediments) and immobilized (migrated sediments) and exposed in the River Spree (north-eastern Germany) to initiate the recovery process. We then evaluated the microbial function (community respiration, net community production and extracellular enzymatic activities) as well as the bacterial, fungal and diatom community structure (16S rRNA gene and ITS region metabarcoding, and microscopic diatom morphotype classification). We observed different recovery times for community respiration (less than 7 days) and gross primary production (more than 5 months), implying a shift toward net heterotrophy in the first few months after stress exposure. Similarly, we observed a strong autotrophic community response (particularly associated with the diatoms Navicula and Fragilaria), especially in migrated sediments. The bacterial and fungal community response to sediment drying was stronger than to bedform migration (particularly associated with the bacterium Flavobacterium and the fungi Alternaria sp. and Aureobasidium pullulans). Our results show that sediment drying and bedform migration had a significant impact on the microbial community function and structure, which persisted for several months after the stress. Due to the surprising long period of recovery, successive stress events combined with seasonal effects will likely hamper the ongoing recovery process with severe alterations to the microbial function and structure. These findings extend the concept of ecosystem resilience and stability on the dimensions of timescale and seasonal environmental variations. Legacy effects are expected to play a key role when facing future stress. Y1 - 2023 UR - https://www.frontiersin.org/articles/10.3389/fevo.2023.1112519/full U6 - https://doi.org/10.3389/fevo.2023.1112519 SN - 2296-701X VL - Vol. 11 ER - TY - CHAP A1 - Risse-Buhl, Ute A1 - Hagedorn, Frank A1 - Dümig, Alexander A1 - Gessner, Mark O. A1 - Schaaf, Wolfgang A1 - Nii-Annang, Seth A1 - Gerull, Linda A1 - Mutz, Michael ED - Jeltsch, Florian ED - Joshi, Jasmin T1 - Dynamics, chemical properties and bioavailability of DOC in an early successional catchment T2 - GfÖ 43rd Annual Meeting, Building bridges in ecology, linking systems, scales and disciplines, September 9 to 13, 2013, Potsdam, Germany N2 - The dynamics of dissolved organic carbon (DOC) have been intensively studied in mature ecosystems, but little is known about DOC dynamics and the significance of DOC as a substrate for microbial activity in early-successional catchments. We determined the concentration, chemical composition, radiocarbon age, and bioavailability of DOC along the hydrological flow path from soil solution to a downstream pond in a recently constructed catchment (Chicken Creek Catchment, Germany). Soil solution, upwelling ground water, subsurface water in an alluvial fan, and pond water all had high DOC concentrations (averaged 6.0 – 11.6 mg DOC L‐1), despite small carbon stocks in either vegetation or soil of the catchment. The mean 14C age of DOC in upwelling ground water was 2600 to 2800 years. Solid-state CPMAS 13C NMR revealed a higher proportion of aromatic compounds (32%) and a lower proportion of carbohydrates (33%) in upwelling ground water compared to pond water (18% and 45%, respectively). 14C age and 13C NMR spectra suggest that DOC was partly mobilized from charred organic matter inherent in the Quaternary substrate. In a 70-days incubation experiment, 20% of the total DOC was found to be bioavailable, irrespective of the water type. Origin of the microbial communities within the catchment (enriched from soil, stream sediment or pond water) had only marginal effects on overall DOC utilization. Overall, our data suggest that both recent and old DOC support microbial activity during early ecosystem succession, although a large fraction of the DOC is recalcitrant and eventually exported from the catchment once it has been mobilized. Y1 - 2013 SP - S. 377 PB - Gesellschaft für Ökologie CY - Berlin ER -