TY - JOUR A1 - Fabian, Jenny A1 - Zlatanovic, Sanja A1 - Mutz, Michael A1 - Grossart, Hans-Peter A1 - van Geldern, Robert A1 - Ulrich, Andreas A1 - Gleixner, Gerd A1 - Premke, Katrin T1 - Environmental control on microbial turnover of leaf carbon in streams BT - Ecological function of phototrophic-heterotrophic interactions JF - Frontiers in microbiology N2 - In aquatic ecosystems, light availability can significantly influence microbial turnover of terrestrial organic matter through associated metabolic interactions between phototrophic and heterotrophic communities. However, particularly in streams, microbial functions vary significantly with the structure of the streambed, that is the distribution and spatial arrangement of sediment grains in the streambed. It is therefore essential to elucidate how environmental factors synergistically define the microbial turnover of terrestrial organic matter in order to better understand the ecological role of photoheterotrophic interactions in stream ecosystem processes. In outdoor experimental streams, we examined how the structure of streambeds modifies the influence of light availability on microbial turnover of leaf carbon (C). Furthermore, we investigated whether the studied relationships of microbial leaf C turnover to environmental conditions are affected by flow intermittency commonly occurring in streams. We applied leaves enriched with a C-13-stable isotope tracer and combined quantitative and isotope analyses. We thereby elucidated whether treatment induced changes in C turnover were associated with altered use of leaf C within the microbial food web. Moreover, isotope analyses were combined with measurements of microbial community composition to determine whether changes in community function were associated with a change in community composition. In this study, we present evidence, that environmental factors interactively determine how phototrophs and heterotrophs contribute to leaf C turnover. Light availability promoted the utilization of leaf C within the microbial food web, which was likely associated with a promoted availability of highly bioavailable metabolites of phototrophic origin. However, our results additionally confirm that the structure of the streambed modifies light-related changes in microbial C turnover. From our observations, we conclude that the streambed structure influences the strength of photo-heterotrophic interactions by defining the spatial availability of algal metabolites in the streambed and the composition of microbial communities. Collectively, our multifactorial approach provides valuable insights into environmental controls on the functioning of stream ecosystems. KW - algae KW - bacteria KW - microbial interactions KW - C-13 stable isotopes KW - PLFA KW - terrestrial carbon KW - streambed structure KW - light Y1 - 2018 U6 - https://doi.org/10.3389/fmicb.2018.01044 SN - 1664-302X VL - 9 PB - Frontiers Research Foundation CY - Lausanne ER - TY - GEN A1 - Fabian, Jenny A1 - Zlatanović, Sanja A1 - Mutz, Michael A1 - Grossart, Hans-Peter A1 - Geldern, Robert van A1 - Ulrich, Andreas A1 - Gleixner, Gerd A1 - Premke, Katrin T1 - Environmental control on microbial turnover of leaf carbon in streams BT - ecological function of phototrophic-heterotrophic interactions T2 - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe N2 - In aquatic ecosystems, light availability can significantly influence microbial turnover of terrestrial organic matter through associated metabolic interactions between phototrophic and heterotrophic communities. However, particularly in streams, microbial functions vary significantly with the structure of the streambed, that is the distribution and spatial arrangement of sediment grains in the streambed. It is therefore essential to elucidate how environmental factors synergistically define the microbial turnover of terrestrial organic matter in order to better understand the ecological role of photo-heterotrophic interactions in stream ecosystem processes. In outdoor experimental streams, we examined how the structure of streambeds modifies the influence of light availability on microbial turnover of leaf carbon (C). Furthermore, we investigated whether the studied relationships of microbial leaf C turnover to environmental conditions are affected by flow intermittency commonly occurring in streams. We applied leaves enriched with a 13C-stable isotope tracer and combined quantitative and isotope analyses. We thereby elucidated whether treatment induced changes in C turnover were associated with altered use of leaf C within the microbial food web. Moreover, isotope analyses were combined with measurements of microbial community composition to determine whether changes in community function were associated with a change in community composition. In this study, we present evidence, that environmental factors interactively determine how phototrophs and heterotrophs contribute to leaf C turnover. Light availability promoted the utilization of leaf C within the microbial food web, which was likely associated with a promoted availability of highly bioavailable metabolites of phototrophic origin. However, our results additionally confirm that the structure of the streambed modifies light-related changes in microbial C turnover. From our observations, we conclude that the streambed structure influences the strength of photo-heterotrophic interactions by defining the spatial availability of algal metabolites in the streambed and the composition of microbial communities. Collectively, our multifactorial approach provides valuable insights into environmental controls on the functioning of stream ecosystems. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 693 KW - algae KW - bacteria KW - microbial interactions KW - 13C stable isotopes KW - PLFA KW - terrestrial carbon KW - streambed structure KW - light Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-426336 SN - 1866-8372 IS - 693 ER - TY - JOUR A1 - Mutz, Michael A1 - Burrmann, Ulrike T1 - Schulische Arbeitsgemeinschaften als Kontexte für Freizeitaktivitäten : Beteiligungschancen für sozial benachteiligte Jugendliche? N2 - School can be regarded as a context for a variety of leisure activities. Especially in all-day schools an increasing amount of young adolescents is spending more time in extracurricular activities. Therefore, all-day schools hold the potential to produce an "educational surplus" because it is argued that these activities contribute to the psychosocial development of adolescents. However, prior to the quest for possible developmental outcomes which could be related to extracurricular activities, another fundamental question must be responded to: Which groups of these young people do actually participate in such after-school programs? While analysing the socio-economic structure of participants for different school-organised activities, the article follows this query. For reasons of comparability, two other leisure contexts are examined: Clubs and volunteer associations as organised contexts on the one hand and a variety of informal and unstructured leisure activities on the other hand. The results reveal that extracurricular activities in schools succeed in including socially disadvantaged adolescents. The study is based on a secondary analysis of the German PISA 2000 data set. Y1 - 2009 SN - 1436-1957 ER - TY - BOOK A1 - Holtmann, Dieter A1 - Mutz, Michael A1 - Alber, Florian A1 - Görl, Tilo A1 - Buchheister, Claudia A1 - Hinteregger, Sigrid A1 - Grüneberg, Franziska A1 - Meisdrock, Claudia A1 - Jeske, Lydia A1 - Ratzlaff, Olaf A1 - Arlt, Maria A1 - Fink, Jana A1 - Wille, Robin A1 - Steinberg, Juliane A1 - Fütterer, Bernhard A1 - Balke, Gregor A1 - Wache, Stephan A1 - Benz, Caroline A1 - Humcke, Daniela A1 - Bruhn, Anja A1 - Lapp, Joachim A1 - Buhr, Stefanie A1 - Zippka, Susanne A1 - Thessel, Friedericke T1 - Zur Performanz von Wohlfahrtsregimen und zu den Unterstützungspotentialen für die verschiedenen Wohlfahrtskonzepte N2 - Wie Gesellschaften Wohlfahrt organisieren und institutionalisieren, drückt ihre grundlegenden Wertvorstellungen über gutes Zusammenleben aus. Der Vergleich von Gesellschaften lässt sich besonders fruchtbar mit dem Konzept der Wohlfahrtsregime durchführen, das die Logiken der Produktion und Verteilung von Wohlfahrt ins Zentrum stellt und mit dem Regimebegriff die zeitliche Entwicklung durch Regierungsphasen mit einer bestimmten politischen Ausrichtung thematisiert. Deshalb werden aufgrund einer Auseinandersetzung mit der sozialphilosophischen Diskussion acht Performanzkriterien entwickelt, die als Maßstab für den Vergleich von 28 Ländern und fünf Wohlfahrtsregimen verwendet werden: Wohlstand und Wachstum; ökologische Nachhaltigkeit; Innovation; soziale Sicherung durch Unterstützungsleistungen im Risikofall sowie vorsorgend durch Bildungsinvestitionen; Anerkennung der Besonderheiten (Frauenfreundlichkeit und Migrantenfreundlichkeit); Gleichheit der Teilhabe; soziale Integration; Autonomie („freedom of choice and capabilities”). Anschließend wird der Umbau der Wohlfahrtsregime anlässlich der aktuellen Herausforderungen und Randbedingungen für die verschiedenen Wohlfahrtsregime diskutiert. Schließlich wird untersucht, welche Gruppen in welchen Ländern welche der sechs Wohlfahrtskonzepte unterstützen, die sich bei der Faktorenanalyse von internationalen Einstellungssurveys ergeben. Y1 - 2006 SN - 3-939469-31-9 SN - 978-3-939469-31-5 PB - Univ.-Verl. CY - Potsdam ER - TY - JOUR A1 - Görl, Tilo A1 - Buchheister, Claudia A1 - Mutz, Michael A1 - Buchheister, Claudia A1 - Görl, Tilo ED - Holtmann, Dieter T1 - Die Sozialstrukturanalyse der Bundesrepublik Deutschland im internationalen Vergleich Y1 - 2007 SN - 978-3-939469-86-5 PB - Univ.-Verl. CY - Potsdam ER - TY - JOUR A1 - Mutz, Michael A1 - Nobis, Tina T1 - Politische Sozialisationsleistungen von Freiwilligenvereinigungen: Sportvereine und andere Freiwilligenvereinigungen im Vergleich Y1 - 2007 SN - 978-3-939390-66-4 ER - TY - JOUR A1 - Mutz, Michael A1 - Nobis, Tina T1 - Zur Mitgliederstruktur von Freiwilligenvereinigungen Y1 - 2007 SN - 978-3-939390-66-4 ER - TY - BOOK A1 - Holtmann, Dieter A1 - Mutz, Michael A1 - Buchheister, Claudia A1 - Görl, Tilo T1 - Die Sozialstruktur der Bundesrepublik Deutschland im internationalen Vergleich Y1 - 2007 SN - 978-3-939469-86-5 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - BOOK A1 - Holtmann, Dieter A1 - Mutz, Michael A1 - Buchheister, Claudia A1 - Görl, Tilo T1 - Die Sozialstruktur der Bundesrepublik Deutschland im internationalen Vergleich Y1 - 2007 SN - 978-3-939469-62-9 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - BOOK A1 - Baur, Jürgen A1 - Mutz, Michael A1 - Nobis, Tina A1 - Rübner, Anne A1 - Strahle, Yvonne T1 - Basisdaten zum Programm "Integration durch Sport" T3 - Ass-Materialien Y1 - 2008 SN - 1615-6129 VL - 28 CY - Potsdam ER -