A5049502097- Forest ecology and management
- Ecology and Vegetation Dynamics Studies
- Plant Water Relations and Carbon Dynamics
- Forest Management and Policy
- Plant and animal studies
- Species Distribution and Climate Change
- Forest Ecology and Biodiversity Studies
- Tree-ring climate responses
- Remote Sensing and LiDAR Applications
- Botany and Plant Ecology Studies
- Animal Ecology and Behavior Studies
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Watershed Management Studies
- Vocational Education and Training
- Social and Demographic Issues in Germany
- Climate change and permafrost
- Cryospheric studies and observations
- Sociology and Education Studies
- Forest Insect Ecology and Management
- Horticultural and Viticultural Research
- Microbial Community Ecology and Physiology
- Genetic and phenotypic traits in livestock
- Hydrocarbon exploration and reservoir analysis
- Mycorrhizal Fungi and Plant Interactions
- Botany, Ecology, and Taxonomy Studies
University of Bremen
2023-2024
University of Regensburg
2017-2024
University of Bayreuth
2023-2024
Swiss Federal Institute for Forest, Snow and Landscape Research
2014-2019
ETH Zurich
2016-2018
University of Göttingen
2014
Abstract Models are pivotal for assessing future forest dynamics under the impacts of changing climate and management practices, incorporating representations tree growth, mortality, regeneration. Quantitative studies on importance mortality submodels scarce. We evaluated 15 dynamic vegetation models (DVMs) regarding their sensitivity to different formulations degrees change. The set comprised eight DVMs at stand scale, three landscape four typically applied continental global scale. Some...
Abstract Numerous studies have shown reduced performance in plants that are surrounded by neighbours of the same species 1,2 , a phenomenon known as conspecific negative density dependence (CNDD) 3 . A long-held ecological hypothesis posits CNDD is more pronounced tropical than temperate forests 4,5 which increases community stabilization, coexistence and diversity local tree 6,7 Previous analyses supporting such latitudinal gradient 8,9 suffered from methodological limitations related to...
The area covered by boreal forests accounts for ∼16% of the global and 22% Northern Hemisphere landmass. Changes in productivity functioning this circumpolar biome not only have strong effects on species composition diversity at regional to larger scales, but also Earth's carbon cycle. Although temporal inconsistency response tree growth temperature has been reported from some locations higher northern latitudes, a systematic dendroecological network assessment is still missing most zone....
Abstract Dynamic Vegetation Models ( DVM s) are designed to be suitable for simulating forest succession and species range dynamics under current future conditions based on mathematical representations of the three key processes regeneration, growth, mortality. However, mortality formulations in s typically coarse often lack an empirical basis, which increases uncertainty projections hinders their use developing adaptation strategies climate change. Thus, sound tree models highly needed. We...
In the debate about tree species suited to cope with ongoing global changes, Sweet chestnut (Castanea sativa Mill.) is frequently discussed as a potentially future-proof for Central Europe. This mainly due its current southern distribution range, which climatically corresponds what expected Europe in near future. Present forests are, however, result of historic long-term intensive management, has extended and partially obscured species' natural ecological range autecology. Therefore,...
The future development of forest ecosystems depends critically on tree mortality. However, the suitability empirical mortality algorithms for extrapolation in space or time remains untested. We systematically analyzed performance 46 inventory-based models available from literature using nearly 80 000 independent records 54 strict reserves Germany and Switzerland covering 11 species. Mortality rates were predicted with higher accuracy if covariates growth (or) competition at individual level...
Large uncertainties characterize forest development under global climate change. Although recent studies have found widespread increased tree mortality, the patterns and processes associated with death remain poorly understood, thus restricting accurate mortality predictions. Yet, projections of future dynamics depend critically on robust models, preferably based empirical data rather than theoretical, not well-constrained assumptions. We developed parsimonious models for individual beech...
Die Curricula der primärqualifizierenden Studiengänge in Deutschland weisen erhebliche Differenzen auf. Mit vorliegenden Studie wurde untersucht, ob sich die Gründe für diese Unterschiede auf Vorgaben seitens zuständigen Länderbehörden oder Hochschulen zurückführen lassen. Datenerhebung erfolgte anhand einer mündlichen standardisierten Befragung von Studiengangleitungen. 17 zum Befragungszeitpunkt bestehenden 28 beteiligten an Befragung. Bei ca. 30% befragten gibt es Landesbehörden bezogen...
Despite an increasing demand for Burgundy truffles (Tuber aestivum), gaps remain in our understanding of the fungus' overall lifecycle and ecology. Here, we compile evidence from three independent surveys Hungary Switzerland. First, measured weight maturity 2,656 T. aestivum fruit bodies a three-day harvest August 2014 highly productive orchard Hungary. All specimens ranging between 2 755 g were almost evenly distributed through five maturation classes. Then, another 4,795 harvested on four...
Abstract Dynamic vegetation models ( DVM s) are important tools to understand and predict the functioning dynamics of terrestrial ecosystems under changing environmental conditions. In these models, uncertainty in description demographic processes, particular tree mortality, is a persistent problem. Current mortality formulations lack realism insufficiently constrained by empirical evidence. It has been suggested that empirically estimated submodels would enhance performance, but due many...
Recent climate warming has fueled interest into climate‐driven range shifts of tree species. A common approach to detect is compare the divergent occurrences between juvenile and adult trees along environmental gradients using static data. Divergent life stages can, however, also be caused by ontogenetic effects. These include viable conditions throughout development (‘ontogenetic niche shift') as well demographic dependencies that constrain possible occurrence subsequent stages. Whether...
Abstract Selective hunting can affect demographic characteristics and phenotypic traits of the targeted species. Hunting systems often involve harvesting quotas based on sex, age and/or size categories to avoid selective pressure. However, it is difficult assess whether such regulations deter hunters from targeting larger “trophy” animals with longer horns that may have evolutionary consequences. Here, we compile 44,088 annually resolved absolutely dated measurements Alpine ibex ( Capra )...
Abstract Tree mortality is key for projecting forest dynamics, but difficult to portray in dynamic vegetation models (DVMs). Empirical algorithms (MAs) are often considered promising, little known about DVM robustness when employing MAs of various structures and origins multiple species. We analysed empirical a suite European tree species within consistent framework under present future climates two climatically different study areas Switzerland evaluated their performance using data from...
Forests dominated by European beech (Fagus sylvatica L.) are among both the most widespread in Europe and intensely exploited globally. One of largest remnants unmanaged forests is Uholka-Shyrokyi Luh forest Transcarpathia, Ukraine, covering 8,800 ha primeval forest. In 2000, a permanent plot 10 has been established Uholka massif. All living dead trees with diameter at breast height (DBH) ≥ 60 mm were identified to species, DBH measured, stems tagged mapped. Since then, remeasured 2005,...
The future trajectory of global forests is closely intertwined with tree demography, and a major fundamental goal in ecology to understand the key mechanisms governing spatio‐temporal patterns population dynamics. While previous research has made substantial progress identifying individually, their relative importance among remains unclear mainly due practical limitations. One approach overcome these limitations group according shared effects on variability vital rates quantify therein. We...