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608 results on '"Holderegger, Rolf"'

1. Advancing forest inventorying and monitoring

Author

Ferretti, Marco, Fischer, Christoph, Gessler, Arthur, Graham, Catherine, Meusburger, Katrin, Abegg, Meinrad, Bebi, Peter, Bergamini, Ariel, Brockerhoff, Eckehard G., Brunner, Ivano, Bühler, Christoph, Conedera, Marco, Cothereau, Pierre, D’Odorico, Petra, Düggelin, Christoph, Ginzler, Christian, Grendelmeier, Alex, Haeni, Matthias, Hagedorn, Frank, Hägeli, Martin, Hegetschweiler, Karin Tessa, Holderegger, Rolf, Krumm, Frank, Gugerli, Felix, Queloz, Valentin, Rigling, Andreas, Risch, Anita C., Rohner, Brigitte, Rosset, Christian, Scherrer, Daniel, Schulz, Tobias, Thürig, Esther, Traub, Berthold, von Arx, Georg, Waldner, Peter, Wohlgemuth, Thomas, Zimmermann, Niklaus E., and Shackleton, Ross T.

Published
2024
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2. Monitoring of species’ genetic diversity in Europe varies greatly and overlooks potential climate change impacts

Author

Pearman, Peter B., Broennimann, Olivier, Aavik, Tsipe, Albayrak, Tamer, Alves, Paulo C., Aravanopoulos, F. A., Bertola, Laura D., Biedrzycka, Aleksandra, Buzan, Elena, Cubric-Curik, Vlatka, Djan, Mihajla, Fedorca, Ancuta, Fuentes-Pardo, Angela P., Fussi, Barbara, Godoy, José A., Gugerli, Felix, Hoban, Sean, Holderegger, Rolf, Hvilsom, Christina, Iacolina, Laura, Kalamujic Stroil, Belma, Klinga, Peter, Konopiński, Maciej K., Kopatz, Alexander, Laikre, Linda, Lopes-Fernandes, Margarida, McMahon, Barry John, Mergeay, Joachim, Neophytou, Charalambos, Pálsson, Snæbjörn, Paz-Vinas, Ivan, Posledovich, Diana, Primmer, Craig R., Raeymaekers, Joost A. M., Rinkevich, Baruch, Rolečková, Barbora, Ruņģis, Dainis, Schuerz, Laura, Segelbacher, Gernot, Kavčič Sonnenschein, Katja, Stefanovic, Milomir, Thurfjell, Henrik, Träger, Sabrina, Tsvetkov, Ivaylo N., Velickovic, Nevena, Vergeer, Philippine, Vernesi, Cristiano, Vilà, Carles, Westergren, Marjana, Zachos, Frank E., Guisan, Antoine, and Bruford, Michael

Published
2024
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19. Quantifying dispersal and establishment limitation in a population of an epiphytic lichen

Author

Werth, Silke, Wagner, Helene H, Gugerli, Felix, Holderegger, Rolf, Csencsics, Daniela, Kalwij, Jesse M, and Scheidegger, Christoph

Subjects
dispersal kernel, landscape-scale dispersal, lichenized ascomycetes, real-time PCR, recruitment limitation, snow trap, transplantation
Abstract

Dispersal is a process critical for the dynamics and persistence of metapopulations, but it is difficult to quantify. It has been suggested that the old-forest lichen Lobaria pulmonaria is limited by insufficient dispersal ability. We analyzed 240 DNA extracts derived from snow samples by a L. pulmonaria-specific real-time PCR (polymerase chain reaction) assay of the ITS (internal transcribed spacer) region allowing for the discrimination among propagules originating from a single, isolated source tree or propagules originating from other locations. Samples that were detected as positives by real-time PCR were additionally genotyped for five L. pulmonaria microsatellite loci. Both molecular approaches demonstrated substantial dispersal from other than local sources. In a landscape approach, we additionally analyzed 240 snow samples with real-time PCR of ITS and detected propagules not only in forests where L. pulmonaria was present, but also in large unforested pasture areas and in forest patches where L. pulmonaria was not found. Monitoring of soredia of L. pulmonaria transplanted to maple bark after two vegetation periods showed high variance in growth among forest stands, but no significant differences among different transplantation treatments. Hence, it is probably not dispersal limitation that hinders colonization in the old-forest lichen L. pulmonaria, but ecological constraints at the stand level that can result in establishment limitation. Our study exemplifies that care has to be taken to adequately separate the effects of dispersal limitation from a limitation of establishment.

Published
2006

20. Effect of disturbances on the genetic diversity of an old-forest associated lichen

Author

Werth, Silke, Wagner, Helene H, Holderegger, Rolf, Kalwij, Jesse M, and Scheidegger, Christoph

Subjects
landscape genetics, lichenized ascomycetes, Lobaria pulmonaria, microsatellites, population history, spatial autocorrelation
Abstract

Lichens associated with old forest are commonly assumed to be negatively affected by tree logging or natural disturbances. However, in this study performed in a spruce-dominated sylvopastoral landscape in the Swiss Jura Mountains, we found that genetic diversity of the epiphytic old-forest lichen Lobaria pulmonaria depends on the type of disturbance. We collected 923 thalli from 41 sampling plots of 1 ha corresponding to the categories stand-replacing disturbance (burnt), intensive logging (logged) and uneven-aged forestry (uneven-aged), and analysed the thalli at six mycobiont-specific microsatellite loci. We found evidence for multiple independent immigrations into demes located in burnt and logged areas. Using spatial autocorrelation methods, the spatial scale of the genetic structure caused by the clonal and recombinant component of genetic variation was determined. Spatial autocorrelation of genotype diversity was strong at short distances up to 50 m in logged demes, up to 100 m in uneven-aged demes, with the strongest autocorrelation up to 150 m for burnt demes. The spatial autocorrelation was predominantly attributed to clonal dispersal of vegetative propagules. After accounting for the clonal component, we did not find significant spatial autocorrelation in gene diversity. This pattern may indicate low dispersal ranges of clonal propagules, but random dispersal of sexual ascospores. Genetic diversity was highest in logged demes, and lowest in burnt demes. Our results suggest that genetic diversity of epiphytic lichen demes may not necessarily be impacted by stand-level disturbances for extended time periods.

Published
2006

26. Self-assessment report. WSL evaluation 2022, volume 1

Author

Bauer, Nicole, primary, Bollmann, Kurt, additional, Brockerhoff, Eckehard, additional, Brunner, Ivano, additional, Bürgi, Matthias, additional, Conedera, Marco, additional, Dingler, Josaine, additional, Farinotti, Daniel, additional, Ferretti, Marco, additional, Gessler, Arthur, additional, Gossner, Martin, additional, Graf Pannatier, Elisabeth, additional, Graham, Catherine, additional, Hegg, Christoph, additional, Hersperger, Anna, additional, Holderegger, Rolf, additional, Hunziker, Marcel, additional, Jessel, Beate, additional, Jost, Susanne, additional, Ottmer, Birgit, additional, Plattner, Gian-Kasper, additional, Reckowsky, Urte, additional, Rigling, Andreas, additional, Rixen, Christian, additional, Salzmann, Nadine, additional, Schaub, Marcus, additional, Schneebeli, Martin, additional, Schweizer, Jürg, additional, Seidl, Irmi, additional, Stähli, Manfred, additional, Stecher, Ludwig, additional, von Arx, Georg, additional, Wohlgemuth, Thomas, additional, Zimmermann, Niklaus, additional, and Zurlinden, Andreas, additional

Published
2023
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32. Observer-driven pseudoturnover in vegetation monitoring is context-dependent but does not affect ecological inference

Author

Boch, Steffen, Küchler, Helen, Küchler, Meinrad, Bedolla, Angéline, Ecker, Klaus T., Graf, Ulrich H., Moser, Tobias, Holderegger, Rolf, and Bergamini, Ariel

Subjects
pseudoturnover, fen, vegetation survey, inter-observer difference, dry grassland, ecological indicator value, flood plain, long-term biodiversity monitoring, observer error, raised bog
Abstract

Aims Resurveys of vegetation plots are prone to several errors that can result in misleading conclusions. Minimizing such errors and finding alternative approaches for analyzing resurvey data are therefore important. We focused on inter-observer error and excluded other sources of variation. Our main questions were: How large is the inter-observer error (i.e. pseudoturnover) in vegetation surveys, and can it be reduced by simple data aggregation approaches? Which factors are affecting pseudoturnover and does it vary between morphological species groups or change over time? Is ecological inference robust against inter-observer differences? Location Switzerland. Methods Over seven years, we double-surveyed a total of 224 plots that were marked once in the field and then sampled by two observers independently on the same day. Both observers conducted full vegetation surveys, recording all vascular plant species, their cover, and additional plot information. We then calculated mean ecological indicator values and pseudoturnover. Results Average pseudoturnover was 29% when raw species lists were compared. However, by applying simple aggregation steps to the species list, pseudoturnover was reduced to 17%. Pseudoturnover further varied among habitat types and declined over the years, indicating a training effect among observers. Most overlooked taxa, responsible for pseudoturnover, had low cover values. Mean ecological indicator values were robust against inter-observer differences. Conclusions To minimize pseudoturnover, we suggest continuous training of observers and species-list aggregation prior to analysis. As mean ecological indicator values were robust against inter-observer differences, we conclude that they can provide a reliable estimate of temporal vegetation and ecological changes., Applied Vegetation Science, 25 (3), ISSN:1402-2001, ISSN:1654-109X

Published
2022

39. The Role of Value Systems in Biodiversity Research

Author

Duelli, Peter, Baur, Priska, Buchecker, Matthias, Gugerli, Felix, Holderegger, Rolf, Wohlgemuth, Thomas, Décamps, Henri, editor, Tress, Bärbel, editor, Tress, Gunther, editor, Kienast, Felix, editor, Wildi, Otto, editor, and Ghosh, Sucharita, editor

Published
2007
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41. Developing an Interdisciplinary, Distributed Graduate Course for Twenty-First Century Scientists

Author

Wagner, Helene H., Murphy, Melanie A., and Holderegger, Rolf

Abstract

Graduate programs have placed an increasing emphasis on the importance of interdisciplinary education, but barriers to interdisciplinary training still remain. We present a new model for interdisciplinary, cross-institution graduate teaching that combines the best of local teaching, distance learning, and experiential learning to provide students and faculty with a unique collaborative learning experience and interdisciplinary research skills. We summarize the lessons learned from a highly successful implementation of this course model in the new field of landscape genetics, which integrates concepts and methods from population genetics, landscape ecology, and spatial statistics. The distributed nature of the course allowed sections to be offered locally that would not have been offered otherwise because of the lack of complementary expertise at local institutions. Students gained hands-on experience in interdisciplinary, Web-based and international research collaboration with group projects. A final synthesis meeting was invaluable for course assessment, manuscript development for group projects, and professional networking.

Published
2012
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44. Besserer Biodiversitätsschutz in blau-grünen Ökosystemen

Author

Moor, Helen, Gossner, Martin M, Graham, Catherine, Hobi, Martina L, Logar, Ivana, Narvani, Anita, Reber, Ueli, Seehausen, Ole, Holderegger, Rolf, Altermatt, Florian, and University of Zurich

Subjects
10127 Institute of Evolutionary Biology and Environmental Studies, 570 Life sciences, biology, 590 Animals (Zoology)
Published
2022

49. Break zones in the distributions of alleles and species in alpine plants

Author

IntraBioDiv Consortium, Thiel-Egenter, Conny, Alvarez, Nadir, Holderegger, Rolf, Tribsch, Andreas, Englisch, Thorsten, Wohlgemuth, Thomas, Colli, Licia, Gaudeul, Myriam, Gielly, Ludovic, Jogan, Nejc, Linder, Hans Peter, Negrin, Riccardo, Niklfeld, Harald, Pellecchia, Marco, Rioux, Delphine, Schönswetter, Peter, Taberlet, Pierre, van Loo, Marcela, Winkler, Manuela, and Gugerli, Felix

Published
2011
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