@misc{WannerElmerSommeretal., author = {Wanner, Manfred and Elmer, Michael and Sommer, Michael and Funk, Roger and Puppe, Daniel}, title = {Testate amoebae colonizing a newly exposed land surface are of airborne origin}, series = {Ecological Indicators}, volume = {48}, journal = {Ecological Indicators}, issn = {1470-160x}, doi = {10.1016/j.ecolind.2014.07.037}, pages = {55 -- 62}, abstract = {We hypothesized that at the very beginning of terrestrial ecosystem development, airborne testate amoebae play a pivotal role in facilitating organismic colonization and related soil processes. We, therefore, analyzed size and quantity of airborne testate amoebae and immigration and colonization success of airborne testate amoebae on a new land surface (experimental site "Chicken Creek", artificial post-mining water catchment). Within an altogether 91-day exposure of 70 adhesive traps, 12 species of testate amoebae were identified to be of airborne origin. Phryganella acropodia (51\% of all individuals found, diameter about 35-45 μm) and Centropyxis sphagnicola (23\% of all individuals found, longest axis about 55-68 μm), occurred most frequently in the adhesive traps. We extrapolated an aerial amoeba deposition of 61 individuals d-1 m-2 (living and dead individuals combined). Although it would be necessary to have a longer sequence (some additional years), our analysis of the "target substrate" of aerial immigration (catchment site) may point to a shift from a stochastic (variable) beginning of community assembly to a more deterministic (stable) course. This shift was assigned to an age of seven years of initial soil development. Although experienced specialists are necessary to conduct these time-consuming studies, the presented data suggest that terrestrial amoebae are suitable indicators for initial ecosystem development and utilization.}, language = {en} } @inproceedings{SommerFlassigDuttaetal., author = {Sommer, Lars and Flassig, Peter Michael and Dutta, Amit Kumar and Bestle, Dieter}, title = {Kr{\"u}mmungs-Nebenbedingungen in der aerodynamischen Mehrkriterien-Optimierung von Verdichterschaufelprofilen}, series = {Deutscher Luft- und Raumfahrtkongress 2008, Darmstadt, 23. bis 25. September 2008, Bd. 2}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2008, Darmstadt, 23. bis 25. September 2008, Bd. 2}, publisher = {Dt. Ges. f{\"u}r Luft- und Raumfahrt}, address = {Bonn}, pages = {1011 -- 1022}, language = {de} } @misc{EhrmannPuppeWanneretal., author = {Ehrmann, Otto and Puppe, Daniel and Wanner, Manfred and Kaczorek, Danuta and Sommer, Michael}, title = {Testate amoebae in 31 mature forest ecosystems - densities and micro-distribution in soils}, series = {European Journal of Protistology}, volume = {48}, journal = {European Journal of Protistology}, number = {3}, issn = {1618-0429}, pages = {161 -- 168}, language = {en} } @misc{PuppeKaczorekWanneretal., author = {Puppe, Daniel and Kaczorek, Danuta and Wanner, Manfred and Sommer, Michael}, title = {Dynamics and drivers of the protozoic Si pool along a 10-year chronosequence of initial ecosystem states}, series = {Ecological Engineering}, journal = {Ecological Engineering}, number = {70}, issn = {0925-8574}, doi = {http://dx.doi.org/10.1016/j.ecoleng.2014.06.011}, pages = {477 -- 482}, abstract = {The size and dynamics of biogenic silicon (BSi) pools influence silicon (Si) fluxes from terrestrial to aquatic ecosystems. The research focus up to now was on the role of plants in Si cycling. In recent studies on old forests annual biosilicification rates of idiosomic testate amoebae (i.e. TA producing self-secreted silica shells) were shown to be of the order of Si uptake by trees. However, no comparable data exist for initial ecosystems. We analyzed the protozoic BSi pool (idiosomic TA), corresponding annual biosilicification rates and readily available and amorphous Si fractions along a 10-year chronosequence in a post-mining landscape in Brandenburg, Germany. Idiosomic Si pools ranged from 3 to 680 g Si ha-1 and were about 3-4 times higher at vegetated compared to uncovered spots. They increased significantly with age and were related to temporal development of soil chemical properties. The calculation of annual biosilicification resulted in maxima between 2 and 16 kg Si ha-1 with rates always higher at vegetated spots. Our results showed that the BSi pool of idiosomic TA is built up rapidly during the initial phases of ecosystem development and is strongly linked to plant growth. Furthermore, our findings highlight the importance of TA for Si cycling in young artificial ecosystems.}, language = {en} } @misc{PuppeEhrmannKaczoreketal., author = {Puppe, Daniel and Ehrmann, Otto and Kaczorek, Danuta and Wanner, Manfred and Sommer, Michael}, title = {The protozoic Si pool in temperate forest ecosystems - quantification, abiotic controls and interactions with earthworms}, series = {Geoderma}, journal = {Geoderma}, number = {243-244}, issn = {0016-7061}, pages = {196 -- 204}, language = {en} } @misc{PuppeHoehnKaczoreketal., author = {Puppe, Daniel and H{\"o}hn, Axel and Kaczorek, Danuta and Wanner, Manfred and Sommer, Michael}, title = {As time goes by—Spatiotemporal changes of biogenic Si pools in initial}, series = {Applied Soil Ecology}, volume = {105}, journal = {Applied Soil Ecology}, issn = {0929-1393}, doi = {10.1016/j.apsoil.2016.01.020}, pages = {9 -- 16}, abstract = {Accumulation and recycling of biogenic silicon (BSi) in terrestrial ecosystems influence fluxes of dissolved Si from the continents to the oceans, thus act as a filter in the global Si cycle. Although the biogenic control mechanism especially of phytogenic Si pools (phytoliths) has been generally recognized since decades quantitative information on other terrestrial BSi pools is surprisingly rare. For the first time terrestrial protophytic (diatom frustules), protozoic (testate amoeba shells) and zoogenic (sponge spicules) Si pools were quantified in soils of initial ecosystem states. We analyzed spatiotemporal changes of these Si pools in differently aged soils of the artificial catchment 'Chicken Creek' in NE Germany. Within a relatively short time span (<10 years) of ecosystem development protophytic, protozoic and zoogenic Si pool sizes increased markedly, whereat protozoic Si pools were the smallest ones with a maximum of 6.2 mg m-2. Zoogenic Si pool size (max. 22.6 mg m-2) is comparable to the one of protophytic Si pools (max. 30.5 mg m-2) although only few sponge spicules (n = 10) and spicule fragments (n = 2) were found. Differences in quantities, dynamics and resistibility against dissolution of various BSi pools indicate their possibility to influence biogeochemical Si cycling relatively rapid (protophytic and protozoic Si pools) or slow (zoogenic Si pool). Spatiotemporal changes of protophytic and protozoic Si pools within the first decade of ecosystem development seem to be mainly controlled by (biotic) small-scale environmental conditions (e.g., vegetation, food sources).}, language = {en} } @misc{WannerSeidlLampaaHoehnetal., author = {Wanner, Manfred and Seidl-Lampaa, Barbara and H{\"o}hn, Axel and Puppe, Daniel and Meisterfeld, Ralf and Sommer, Michael}, title = {Culture growth of testate amoebae under different silicon concentrations}, series = {European Journal of Protistology}, volume = {56}, journal = {European Journal of Protistology}, issn = {1618-0429}, pages = {171 -- 179}, language = {en} } @misc{PuppeHoehnKaczoreketal., author = {Puppe, Daniel and H{\"o}hn, Axel and Kaczorek, Danuta and Wanner, Manfred and Wehrhan, Marc and Sommer, Michael}, title = {How big is the influence of biogenic silicon pools on short-term changes in water-soluble silicon in soils? Implications from a study of a 10-year-old soil-plant system}, series = {Biogeosciences}, volume = {14}, journal = {Biogeosciences}, number = {22}, issn = {1726-4189}, pages = {5239 -- 5252}, language = {en} } @techreport{KeulerBlockAhrensetal., author = {Keuler, Klaus and Block, Alexander and Ahrens, Wilfried and Jacob, Daniela and Rechid, Diana and Kotova, Lola and Kotlarski, Sven and Heimann, Dietrich and Zemsch, Maria and Knoche, Richard and Dittmann, Ernst and Walter, Andreas and Berger, Franz and Sommer, Michael}, title = {QUIRCS: Quantification of uncertainties in regional climate and climate change simulations. German Climate Research Programme (2001-2006), Final Symposium 2005}, publisher = {DLR}, address = {Bonn}, pages = {9}, abstract = {The comparison of multi model runs of the reference period 1979-1993 with different observational data sets for several climate parameters enables the quantification of the model uncertainties in representing present-day climate conditions for Central Europe. The quantification is based on a number of objective distance measures which detect differences in the spatial and temporal structures of the data sets being compared. Additional climate change simulations of two 30-year periods (control and scenario simulation) are performed for the SRES B2 global change scenario. They indicate a severe warming for Germany with values of up to 4 K in summer which is much higher than the quantified uncertainty range of the regional models for this climate parameter. For precipitation in Germany, a weak reduction during the summer months is overcompensated by an increase in winter and fall. However, the simulated changes are smaller than the quantified uncertainty range for the regional models so that in particular a significant reduction of the annual precipitation in Germany cannot be stated on basis of the current simulations for the B2 scenario. Aim of the research in the context of DEKLIM A reliable assessment of possible future climate developments requires an improved understanding of climate and its variability as well as a detailed knowledge of the uncertainties of climate simulations which provide the requested information about the potential degree of future changes. The project QUIRCS focuses on the climate patterns of Central Europe and investigates the quality of currently used regional climate models and regionalization techniques by a model inter-comparison, a substantial model evaluation, additional sensitivity studies and an extensive analysis of climate data. The major scientific aims are • to quantify the uncertainties of regional climate simulations and of observed climate data, • to provide a regional climate change scenario for Europe with a particular focus on Germany, • to assess the reliability of the produced climate change signals with respect to the Collapse.}, language = {en} } @techreport{ThonickeRahnerArnethetal., author = {Thonicke, Kirsten and Rahner, Eva and Arneth, Almut and Bartkowski, Bartosz and Bonn, Aletta and D{\"o}hler, Christian and Finger, Robert and Freitag, Jens and Grosch, Rita and Grossart, Hans-Peter and Gr{\"u}tzmacher, Kim and Hartman Scholz, Amber and H{\"a}user, Christoph and Hickler, Thomas and H{\"o}lker, Franz and J{\"a}hnig, Sonja C. and Jeschke, Jonathan and Kassen, Rees and Kastner, Thomas and Kramer-Schadt, Stephanie and Krug, Cornelia and Lakner, Sebastian and Loft, Lasse and Matzdorf, Bettina and Meakins, Felicity and De Meester, Luc and Monaghan, Michael T. and M{\"u}ller, Daniel and Overmann, J{\"o}rg and Quaas, Martin and Radchuk, Viktoriia and Reyer, Christopher and Roos, Christian and Scholz, Imme and Schroer, Sibylle and Sioen, Giles Bruno and Sommer, Simone and Sommerwerk, Nike and Tockner, Klement and Turk, Zachary and Warner, Barbara and W{\"a}tzold, Frank and Wende, Wolfgang and Veenstra, Tonjes and Voort, Hein van de}, title = {10 Must-Knows aus der Biodiversit{\"a}tsforschung}, publisher = {Potsdam-Institut f{\"u}r Klimafolgenforschung e.V. (PIK)}, address = {Potsdam}, doi = {10.5281/zenodo.6257476}, pages = {58}, language = {de} } @misc{HeinrichBalanzateguiBensetal., author = {Heinrich, Ingo and Balanzategui, Daniel and Bens, Oliver and Blasch, Gerald and Blume, Theresa and B{\"o}ttcher, Falk and Borg, Erik and Brademann, Brian and Brauer, Achim and Conrad, Christopher and Dietze, Elisabeth and Dr{\"a}ger, Nadine and Fiener, Peter and Gerke, Horst H. and G{\"u}ntner, Andreas and Heine, Iris and Helle, Gerhard and Herbrich, Marcus and Harfenmeister, Katharina and Heußner, Karl-Uwe and Hohmann, Christian and Itzerott, Sibylle and Jurasinski, Gerald and Kaiser, Knut and Kappler, Christoph and Koebsch, Franziska and Liebner, Susanne and Lischeid, Gunnar and Merz, Bruno and Missling, Klaus Dieter and Morgner, Markus and Pinkerneil, Sylvia and Plessen, Birgit and Raab, Thomas and Ruhtz, Thomas and Sachs, Torsten and Sommer, Michael and Spengler, Daniel and Stender, Vivien and St{\"u}ve, Peter and Wilken, Florian}, title = {Interdisciplinary Geo-ecological Research across Time Scales in the Northeast German Lowland Observatory (TERENO-NE)}, series = {Vadose Zone Journal}, volume = {17}, journal = {Vadose Zone Journal}, number = {1}, issn = {1539-1663}, doi = {10.2136/vzj2018.06.0116}, pages = {1 -- 25}, language = {en} } @techreport{KeulerBlockAhrensetal., author = {Keuler, Klaus and Block, Alexander and Ahrens, Wilfried and Jacob, Daniela and Rechid, Diana and Kotova, Lola and Kotlarski, Sven and Heimann, Dietrich and Zemsch, Maria and Knoche, Richard and Dittmann, Ernst and Walter, Andreas and Berger, Franz and Sommer, Michael}, title = {Quantifizierung von Ungenauigkeiten regionaler Klima- und Klima{\"a}nderungssimulationen (QUIRCS). Zusammenfassung der wesentlichen Ergebnisse eines Projektes des deutschen Klimaforschungsprogramms DEKLIM}, pages = {153}, abstract = {Das Projekt QUIRCS ("Quantification of Uncertainties in Regional Climate and Climate-Change Simulations") ist eines von insgesamt37Verbundforschungsprojekten, die im Rahmen des Deutschen Klimaforschungsprogramms DEKLIM vom BMBF als Beitrag zum Teilbereich „Klima-forschung und Vorhersagbarkeit" gef{\"o}rdert worden sind [DEKLIM, 2005]. Unter der Koordination des Lehrstuhls Umweltmeteorologie der Brandenburgischen Technischen Universit{\"a}t (BTU) Cottbus waren 6 Institutionen mit insgesamt 13 Mitarbeitern {\"u}ber 4 Jahre an der Durchf{\"u}hrung des Projektes beteiligt. Der vorliegende Bericht gibt einen {\"U}berblick {\"u}ber die verschiedenen Aufgabenstellungen und fasst die wesentlichen Ergebnisse des Projektes zusammen.}, language = {de} } @misc{SommerHoehnBreueretal., author = {Sommer, Michael and H{\"o}hn, Axel and Breuer, J{\"o}rn and Zagorski, Zbigniew and Busse, J. and Barkusky, Dietmar and Meier, K. and Puppe, Daniel and Wanner, Manfred and Kaczorek, Danuta}, title = {Si cycling in a forest biogeosystem - the importance of transient state biogenic Si pools}, series = {Biogeosciences}, volume = {10}, journal = {Biogeosciences}, number = {7}, issn = {1726-4189}, pages = {4991 -- 5007}, language = {en} } @misc{PuppeWannerSommer, author = {Puppe, Daniel and Wanner, Manfred and Sommer, Michael}, title = {Data on euglyphid testate amoeba densities, corresponding protozoic silicon pools, and selected soil parameters of initial and forested biogeosystems}, series = {Data in Brief}, volume = {21}, journal = {Data in Brief}, issn = {2352-3409}, pages = {1697 -- 1703}, language = {en} }