TY - INPR A1 - Ensslin, Andreas A1 - Tschoepe, Okka A1 - Burkart, Michael A1 - Joshi, Jasmin Radha T1 - Fitness decline and adaptation to novel environments in ex situ plant collections: Current knowledge and future perspectives T2 - : an international journal N2 - The conservation of rare plant species as living collections in botanic gardens and arboreta has become an established tool in the battle against worldwide species' extinctions. However, the establishment of ex situ collections with a high conservation value requires a sound understanding of the evolutionary processes that may reduce the suitability of these collections for future reintroductions. Particularly, risks such as fitness decline of cultivated plants over time, trait shifts and loss of adaptation to the original habitat due to changes in selection regimes have rarely been addressed so far. Based on a literature review and results of our own project we show that genetic drift can lead to fitness decline in ex situ cultivated plants, but these drift effects strongly depend on the conditions and cultivation history in the ex situ facility. Furthermore, we provide evidence that shifts in traits such as germination and flowering time, and a decrease in stress tolerance to drought and competition can reduce the conservation value of ex situ collections. These threats associated with ex situ conditions require more attention by researchers, curators and conservationists. We need to increase knowledge on traits that are subject to novel selection pressures in ex situ collections, and to define population sizes that prevent genetic drift. Establishing conservation networks with replicated collections across gardens and balancing the seed contribution of mother plants to the next generation within a collection are suggested as first steps to increase the conservation value of ex situ plant collections. (C) 2015 Elsevier Ltd. All rights reserved. KW - Ex situ conservation KW - Botanic gardens KW - Artificial selection KW - Genetic drift KW - Adaptive evolution Y1 - 2015 U6 - https://doi.org/10.1016/j.biocon.2015.10.012 SN - 0006-3207 SN - 1873-2917 VL - 192 SP - 394 EP - 401 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Hector, Andy A1 - Hautier, Yann A1 - Saner, Philippe A1 - Wacker, Lukas A1 - Bagchi, Robert A1 - Joshi, Jasmin Radha A1 - Scherer-Lorenzen, Michael A1 - Spehn, Eva M. A1 - Bazeley-White, Ellen A1 - Weilenmann, Markus A1 - Caldeira, Maria da Conceição Brálio de Brito A1 - Dimitrakopoulos, Panayiotis G. A1 - Finn, John A. A1 - Huss-Danell, Kerstin A1 - Jumpponen, Ari A1 - Mulder, Christa P. H. A1 - Palmborg, Cecilia A1 - Pereira, J. S. A1 - Siamantziouras, Akis S. D. A1 - Terry, Andrew C. A1 - Troumbis, Andreas Y. A1 - Schmid, Bernhard A1 - Loreau, Michel T1 - General stabilizing effects of plant diversity on grassland productivity through population asynchrony and overyielding N2 - Insurance effects of biodiversity can stabilize the functioning of multispecies ecosystems against environmental variability when differential species' responses lead to asynchronous population dynamics. When responses are not perfectly positively correlated, declines in some populations are compensated by increases in others, smoothing variability in ecosystem productivity. This variance reduction effect of biodiversity is analogous to the risk- spreading benefits of diverse investment portfolios in financial markets. We use data from the BIODEPTH network of grassland biodiversity experiments to perform a general test for stabilizing effects of plant diversity on the temporal variability of individual species, functional groups, and aggregate communities. We tested three potential mechanisms: reduction of temporal variability through population asynchrony; enhancement of long-term average performance through positive selection effects; and increases in the temporal mean due to overyielding. Our results support a stabilizing effect of diversity on the temporal variability of grassland aboveground annual net primary production through two mechanisms. Two-species communities with greater population asynchrony were more stable in their average production over time due to compensatory fluctuations. Overyielding also stabilized productivity by increasing levels of average biomass production relative to temporal variability. However, there was no evidence for a performance-enhancing effect on the temporal mean through positive selection effects. In combination with previous work, our results suggest that stabilizing effects of diversity on community productivity through population asynchrony and overyielding appear to be general in grassland ecosystems. Y1 - 2010 UR - http://esapubs.org/esapubs/journals/ecology.htm SN - 0012-9658 ER - TY - JOUR A1 - Rottstock, Tanja A1 - Joshi, Jasmin Radha A1 - Kummer, Volker A1 - Fischer, Markus T1 - Higher plant diversity promotes higher diversity of fungal pathogens, while it decreases pathogen infection per plant JF - Ecology : a publication of the Ecological Society of America N2 - Fungal plant pathogens are common in natural communities where they affect plant physiology, plant survival, and biomass production. Conversely, pathogen transmission and infection may be regulated by plant community characteristics such as plant species diversity and functional composition that favor pathogen diversity through increases in host diversity while simultaneously reducing pathogen infection via increased variability in host density and spatial heterogeneity. Therefore, a comprehensive understanding of multi-host multi-pathogen interactions is of high significance in the context of biodiversity-ecosystem functioning. We investigated the relationship between plant diversity and aboveground obligate parasitic fungal pathogen ("pathogens" hereafter) diversity and infection in grasslands of a long-term, large-scale, biodiversity experiment with varying plant species (1-60 species) and plant functional group diversity (1-4 groups). To estimate pathogen infection of the plant communities, we visually assessed pathogen-group presence (i.e., rusts, powdery mildews, downy mildews, smuts, and leaf-spot diseases) and overall infection levels (combining incidence and severity of each pathogen group) in 82 experimental plots on all aboveground organs of all plant species per plot during four surveys in 2006. Pathogen diversity, assessed as the cumulative number of pathogen groups on all plant species per plot, increased log-linearly with plant species diversity. However, pathogen incidence and severity, and hence overall infection, decreased with increasing plant species diversity. In addition, co-infection of plant individuals by two or more pathogen groups was less likely with increasing plant community diversity. We conclude that plant community diversity promotes pathogen-community diversity while at the same time reducing pathogen infection levels of plant individuals. KW - biodiversity KW - ecosystem processes KW - ecosystem services KW - grasslands KW - multi-host-multi-pathogen interactions KW - obligate parasitic fungal pathogens KW - pathogen diversity KW - pathogen proneness KW - pathogen transmission KW - plant functional types Y1 - 2014 SN - 0012-9658 SN - 1939-9170 VL - 95 IS - 7 SP - 1907 EP - 1917 PB - Wiley CY - Washington ER - TY - JOUR A1 - Zuppinger-Dingley, D. A1 - Schmid, Bernhard A1 - Chen, Y. A1 - Brandl, H. A1 - van der Heijden, M. G. A. A1 - Joshi, Jasmin Radha T1 - In their native range, invasive plants are held in check by negative soil-feedbacks JF - Ecosphere : the magazine of the International Ecology University N2 - The ability of some plant species to dominate communities in new biogeographical ranges has been attributed to an innate higher competitive ability and release from co-evolved specialist enemies. Specifically, invasive success in the new range might be explained by release from biotic negative soil-feedbacks, which control potentially dominant species in their native range. To test this hypothesis, we grew individuals from sixteen phylogenetically paired European grassland species that became either invasive or naturalized in new ranges, in either sterilized soil or in sterilized soil with unsterilized soil inoculum from their native home range. We found that although the native members of invasive species generally performed better than those of naturalized species, these native members of invasive species also responded more negatively to native soil inoculum than did the native members of naturalized species. This supports our hypothesis that potentially invasive species in their native range are held in check by negative soil-feedbacks. However, contrary to expectation, negative soil-feedbacks in potentially invasive species were not much increased by interspecific competition. There was no significant variation among families between invasive and naturalized species regarding their feedback response (negative vs. neutral). Therefore, we conclude that the observed negative soil feedbacks in potentially invasive species may be quite widespread in European families of typical grassland species. KW - biotic interactions KW - enemy release KW - invasive species KW - native range KW - naturalized species KW - plant invasions KW - plant-soil feedbacks KW - soil inoculation KW - soil sterilization Y1 - 2011 U6 - https://doi.org/10.1890/ES11-00061.1 SN - 2150-8925 VL - 2 IS - 5 PB - Wiley CY - Washington ER - TY - JOUR A1 - Müller, Jörg A1 - Heinze, Johannes A1 - Joshi, Jasmin Radha A1 - Boch, Steffen A1 - Klaus, Valentin H. A1 - Fischer, Markus A1 - Prati, Daniel T1 - Influence of experimental soil disturbances on the diversity of plants in agricultural grasslands JF - Journal of plant ecology N2 - Disturbance is supposed to play an important role for biodiversity and ecosystem stability as described by the intermediate disturbance hypothesis (IDH), which predicts highest species richness at intermediate levels of disturbances. In this study, we tested the effects of artificial soil disturbances on diversity of annual and perennial vascular plants and bryophytes in a field experiment in 86 agricultural grasslands differing in land use in two regions of Germany. On each grassland, we implemented four treatments: three treatments differing in application time of soil disturbances and one control. One year after experimental disturbance, we recorded vegetation and measured biomass productivity and bare ground. We analysed the disturbance response taking effects of region and land-use-accompanied disturbance regimes into account. Region and land-use type strongly determined plant species richness. Experimental disturbances had small positive effects on the species richness of annuals, but none on perennials or bryophytes. Bare ground was positively related to species richness of bryophytes. However, exceeding the creation of 12% bare ground further disturbance had a detrimental effect on bryophyte species richness, which corresponds to the IDH. As biomass productivity was unaffected by disturbance our results indicate that the disturbance effect on species richness of annuals was not due to decreased overall productivity, but rather due to short-term lowered inter- and intraspecific competition at the newly created microsites. Generally, our results highlight the importance of soil disturbances for species richness of annual plants and bryophytes in agricultural grasslands. However, most grasslands were disturbed naturally or by land-use practices and our additional experimental soil disturbances only had a small short-term effect. Overall, total plant diversity in grasslands seemed to be more limited by the availability of propagules rather than by suitable microsites for germination. Thus, nature conservation efforts to increase grassland diversity should focus on overcoming propagule limitation, for instance by additional sowing of seeds, while the creation of additional open patches by disturbance might only be appropriate where natural disturbances are scarce. KW - annuals KW - bryophytes KW - colonization KW - intermediate disturbance hypothesis KW - microsites Y1 - 2014 U6 - https://doi.org/10.1093/jpe/rtt062 SN - 1752-9921 SN - 1752-993X VL - 7 IS - 6 SP - 509 EP - 517 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Schwarzer, Christian A1 - Heinken, Thilo A1 - Luthardt, Vera A1 - Joshi, Jasmin Radha T1 - Latitudinal shifts in species interactions interfere with resistance of southern but not of northern bog-plant communities to experimental climate change JF - The journal of ecology N2 - The persistence of species under changed climatic conditions depends on adaptations and plastic responses to these conditions and on interactions with their local plant community resulting in direct and indirect effects of changed climatic conditions. Populations at species' range margins may be especially crucial in containing a gene pool comprising adaptations to extreme climatic conditions. Many species of northern European bog ecosystems reach their southern lowland range limit in central Europe. In a common-garden experiment, we experimentally assessed the impact of projected climatic changes on five bog-plant species (including peat moss Sphagnum magellanicum) sampled along a latitudinal gradient of 1400km from Scandinavia to the marginal lowland populations in Germany. Populations were cultivated in monocultures and in experimental communities composed of all five species from their local community, and exposed to five combinations of three climate treatments (warming, fluctuating water-tables, fertilization) in a southern common garden. Whereas most monocultures showed a decreasing biomass production from southern to northern origins under southern environmental conditions, in the experimental mixed-species communities, an increasing biomass production towards northern communities was observed together with a shift in interspecific interactions along the latitudinal gradient. While negative dominance effects prevailed in southern communities, higher net biodiversity effects were observed in northern subarctic communities. The combined effects of climate treatments increased biomass production in monocultures of most origins. In communities, however, overall the treatments did not result in significantly changed biomass production. Among individual treatments, water-table fluctuations caused a significant decrease in biomass production, but only in southern communities, indicating higher vulnerability to changed climatic conditions. Here, negative effects of climate treatments on graminoids were not compensated by the slightly increased growth of peat moss that benefited from interspecific interactions only in northern communities.Synthesis. We conclude that shifting interactions within multispecies communities caused pronounced responses to changed climatic conditions in wetland communities of temperate southern marginal, but not of northern subarctic origin. Therefore, future models investigating the impacts of climate change on plant communities should consider geographical variation in species interactions an important factor influencing community responses to changed climatic conditions. KW - additive partitioning of biodiversity effects KW - biodiversity KW - ecosystem services KW - ecosystem stability KW - intraspecific divergence KW - multifactorial environmental change KW - nitrogen deposition KW - northern peatlands KW - Sphagnum magellanicum KW - wetland ecosystems Y1 - 2013 U6 - https://doi.org/10.1111/1365-2745.12158 SN - 0022-0477 SN - 1365-2745 VL - 101 IS - 6 SP - 1484 EP - 1497 PB - Wiley-Blackwell CY - Hoboken ER - TY - GEN A1 - de Vera, Jean-Pierre Paul A1 - Alawi, Mashal A1 - Backhaus, Theresa A1 - Baque, Mickael A1 - Billi, Daniela A1 - Boettger, Ute A1 - Berger, Thomas A1 - Bohmeier, Maria A1 - Cockell, Charles A1 - Demets, Rene A1 - de la Torre Noetzel, Rosa A1 - Edwards, Howell A1 - Elsaesser, Andreas A1 - Fagliarone, Claudia A1 - Fiedler, Annelie A1 - Foing, Bernard A1 - Foucher, Frederic A1 - Fritz, Jörg A1 - Hanke, Franziska A1 - Herzog, Thomas A1 - Horneck, Gerda A1 - Hübers, Heinz-Wilhelm A1 - Huwe, Björn A1 - Joshi, Jasmin Radha A1 - Kozyrovska, Natalia A1 - Kruchten, Martha A1 - Lasch, Peter A1 - Lee, Natuschka A1 - Leuko, Stefan A1 - Leya, Thomas A1 - Lorek, Andreas A1 - Martinez-Frias, Jesus A1 - Meessen, Joachim A1 - Moritz, Sophie A1 - Moeller, Ralf A1 - Olsson-Francis, Karen A1 - Onofri, Silvano A1 - Ott, Sieglinde A1 - Pacelli, Claudia A1 - Podolich, Olga A1 - Rabbow, Elke A1 - Reitz, Günther A1 - Rettberg, Petra A1 - Reva, Oleg A1 - Rothschild, Lynn A1 - Garcia Sancho, Leo A1 - Schulze-Makuch, Dirk A1 - Selbmann, Laura A1 - Serrano, Paloma A1 - Szewzyk, Ulrich A1 - Verseux, Cyprien A1 - Wadsworth, Jennifer A1 - Wagner, Dirk A1 - Westall, Frances A1 - Wolter, David A1 - Zucconi, Laura T1 - Limits of life and the habitability of Mars BT - the ESA space experiment BIOMEX on the ISS T2 - Astrobiology N2 - BIOMEX (BIOlogy and Mars EXperiment) is an ESA/Roscosmos space exposure experiment housed within the exposure facility EXPOSE-R2 outside the Zvezda module on the International Space Station (ISS). The design of the multiuser facility supports-among others-the BIOMEX investigations into the stability and level of degradation of space-exposed biosignatures such as pigments, secondary metabolites, and cell surfaces in contact with a terrestrial and Mars analog mineral environment. In parallel, analysis on the viability of the investigated organisms has provided relevant data for evaluation of the habitability of Mars, for the limits of life, and for the likelihood of an interplanetary transfer of life (theory of lithopanspermia). In this project, lichens, archaea, bacteria, cyanobacteria, snow/permafrost algae, meristematic black fungi, and bryophytes from alpine and polar habitats were embedded, grown, and cultured on a mixture of martian and lunar regolith analogs or other terrestrial minerals. The organisms and regolith analogs and terrestrial mineral mixtures were then exposed to space and to simulated Mars-like conditions by way of the EXPOSE-R2 facility. In this special issue, we present the first set of data obtained in reference to our investigation into the habitability of Mars and limits of life. This project was initiated and implemented by the BIOMEX group, an international and interdisciplinary consortium of 30 institutes in 12 countries on 3 continents. Preflight tests for sample selection, results from ground-based simulation experiments, and the space experiments themselves are presented and include a complete overview of the scientific processes required for this space experiment and postflight analysis. The presented BIOMEX concept could be scaled up to future exposure experiments on the Moon and will serve as a pretest in low Earth orbit. KW - EXPOSE-R2 KW - BIOMEX KW - Habitability KW - Limits of life KW - Extremophiles KW - Mars Y1 - 2019 U6 - https://doi.org/10.1089/ast.2018.1897 SN - 1531-1074 SN - 1557-8070 VL - 19 IS - 2 SP - 145 EP - 157 PB - Liebert CY - New Rochelle ER - TY - JOUR A1 - Eckert, Silvia A1 - Herden, Jasmin A1 - Stift, Marc A1 - Joshi, Jasmin Radha A1 - van Kleunen, Mark T1 - Manipulation of cytosine methylation does not remove latitudinal clines in two invasive goldenrod species in Central Europe JF - Molecular ecology N2 - Invasive species frequently differentiate phenotypically in novel environments within a few generations, often even with limited genetic variation. For the invasive plants Solidago canadensis and S. gigantea, we tested whether such differentiation might have occurred through heritable epigenetic changes in cytosine methylation. In a 2-year common-garden experiment, we grew plants from seeds collected along a latitudinal gradient in their non-native Central European range to test for trait differentiation and whether differentiation disappeared when seeds were treated with the demethylation agent zebularine. Microsatellite markers revealed no population structure along the latitudinal gradient in S. canadensis, but three genetic clusters in S. gigantea. Solidago canadensis showed latitudinal clines in flowering phenology and growth. In S. gigantea, the number of clonal offspring decreased with latitude. Although zebularine had a significant effect on early growth, probably through effects on cytosine methylation, latitudinal clines remained (or even got stronger) in plants raised from seeds treated with zebularine. Thus, our experiment provides no evidence that epigenetic mechanisms by selective cytosine methylation contribute to the observed phenotypic differentiation in invasive goldenrods in Central Europe. KW - common‐garden experiment KW - epigenetic variation KW - microsatellites KW - Solidago canadensis KW - Solidago gigantea KW - zebularine Y1 - 2020 U6 - https://doi.org/10.1111/mec.15722 SN - 0962-1083 SN - 1365-294X VL - 30 IS - 1 SP - 222 EP - 236 PB - Wiley CY - Hoboken ER - TY - GEN A1 - Eckert, Silvia A1 - Herden, Jasmin A1 - Stift, Marc A1 - Joshi, Jasmin Radha A1 - van Kleunen, Mark T1 - Manipulation of cytosine methylation does not remove latitudinal clines in two invasive goldenrod species in Central Europe T2 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - Invasive species frequently differentiate phenotypically in novel environments within a few generations, often even with limited genetic variation. For the invasive plants Solidago canadensis and S. gigantea, we tested whether such differentiation might have occurred through heritable epigenetic changes in cytosine methylation. In a 2-year common-garden experiment, we grew plants from seeds collected along a latitudinal gradient in their non-native Central European range to test for trait differentiation and whether differentiation disappeared when seeds were treated with the demethylation agent zebularine. Microsatellite markers revealed no population structure along the latitudinal gradient in S. canadensis, but three genetic clusters in S. gigantea. Solidago canadensis showed latitudinal clines in flowering phenology and growth. In S. gigantea, the number of clonal offspring decreased with latitude. Although zebularine had a significant effect on early growth, probably through effects on cytosine methylation, latitudinal clines remained (or even got stronger) in plants raised from seeds treated with zebularine. Thus, our experiment provides no evidence that epigenetic mechanisms by selective cytosine methylation contribute to the observed phenotypic differentiation in invasive goldenrods in Central Europe. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1378 KW - common‐garden experiment KW - epigenetic variation KW - microsatellites KW - Solidago canadensis KW - Solidago gigantea KW - zebularine Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-569528 SN - 1866-8372 IS - 1 ER - TY - JOUR A1 - Huwe, Björn A1 - Fiedler, Annelie A1 - Moritz, Sophie A1 - Rabbow, Elke A1 - de Vera, Jean-Pierre Paul A1 - Joshi, Jasmin Radha T1 - Mosses in Low Earth Orbit BT - Implications for the Limits of Life and the Habitability of Mars JF - Astrobiology N2 - As a part of the European Space Agency mission "EXPOSE-R2" on the International Space Station (ISS), the BIOMEX (Biology and Mars Experiment) experiment investigates the habitability of Mars and the limits of life. In preparation for the mission, experimental verification tests and scientific verification tests simulating different combinations of abiotic space- and Mars-like conditions were performed to analyze the resistance of a range of model organisms. The simulated abiotic space- and Mars-stressors were extreme temperatures, vacuum, and Mars-like surface ultraviolet (UV) irradiation in different atmospheres. We present for the first time simulated space exposure data of mosses using plantlets of the bryophyte genus Grimmia, which is adapted to high altitudinal extreme abiotic conditions at the Swiss Alps. Our preflight tests showed that severe UVR200-400nm irradiation with the maximal dose of 5 and 6.8 x 10(5) kJ center dot m(-2), respectively, was the only stressor with a negative impact on the vitality with a 37% (terrestrial atmosphere) or 36% reduction (space- and Mars-like atmospheres) in photosynthetic activity. With every exposure to UVR200-400nm 10(5) kJ center dot m(-2), the vitality of the bryophytes dropped by 6%. No effect was found, however, by any other stressor. As the mosses were still vital after doses of ultraviolet radiation (UVR) expected during the EXPOSE-R2 mission on ISS, we show that this earliest extant lineage of land plants is highly resistant to extreme abiotic conditions. KW - Extremotolerant KW - Bryophyte KW - Plant performance KW - Grimmia sp KW - Irradiation KW - UV irradiation Y1 - 2019 U6 - https://doi.org/10.1089/ast.2018.1889 SN - 1531-1074 SN - 1557-8070 VL - 19 IS - 2 SP - 221 EP - 232 PB - Liebert CY - New Rochelle ER -