A5084523041- Wildlife Ecology and Conservation
- Geophysics and Gravity Measurements
- Animal Ecology and Behavior Studies
- Wildlife-Road Interactions and Conservation
- Animal Disease Management and Epidemiology
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Machine Learning and Data Classification
- Advanced Statistical Methods and Models
- Control Systems and Identification
- Bat Biology and Ecology Studies
- Explainable Artificial Intelligence (XAI)
- Statistical Methods and Inference
- Animal Behavior and Welfare Studies
- Genetic and phenotypic traits in livestock
- Rangeland Management and Livestock Ecology
- Marine animal studies overview
- Animal Behavior and Reproduction
- Medical Imaging Techniques and Applications
- Primate Behavior and Ecology
- Wildlife Conservation and Criminology Analyses
- Soil Geostatistics and Mapping
- Radiomics and Machine Learning in Medical Imaging
University of Freiburg
2016-2023
University of York
2020-2023
Zimmer Biomet (Germany)
2023
Ecological data often show temporal, spatial, hierarchical (random effects), or phylogenetic structure. Modern statistical approaches are increasingly accounting for such dependencies. However, when performing cross‐validation, these structures regularly ignored, resulting in serious underestimation of predictive error. One cause the poor performance uncorrected (random) noted by modellers, dependence that persist as model residuals, violating assumption independence. Even more concerning,...
Abstract Poaching is contributing to rapid declines in elephant populations across Africa. Following high-profile changes the political environment, overall number of illegally killed elephants Africa seems be falling, but evaluate potential conservation interventions we must understand processes driving poaching rates at local and global scales. Here show that annual 53 sites strongly correlate with proxies ivory demand main Chinese markets, whereas between-country between-site variation...
Ivory poaching continues to threaten African elephants. We (1) used criminology theory and literature evidence generate hypotheses about factors that may drive, facilitate or motivate poaching, (2) identified datasets representing these factors, (3) tested those with strong sufficient data quality for empirical associations poaching. advance on previous analyses of correlates elephant by using additional leveraging new previously untested explanatory variables. Using 10 286 illegally killed...
Abstract Dispersal is crucial for population viability and thus a popular target conservation measures. However, the ability of individuals to move between habitat patches notoriously difficult estimate. One solution quantify functional connectivity via realistic individual‐based movement models. Such simulation models, however, are build even more parameterize. Here, we use example natal little owl ( Athene noctua ) dispersal develop new analysis chain calibration models using hybrid...
Growth of the illegal wildlife trade is a key driver biodiversity loss, with considerable research focussing on trafficking and trade, but rather less focussed supply. Elephant poaching for ivory has driven recent population decline in African elephants typical example trade. Some heaviest been Southern Tanzania's Ruaha-Rungwa ecosystem. Using data from three successive aerial surveys modern spatial analysis techniques we identify correlates elephant carcasses within ecosystem, which...
Generalized degrees of freedom (GDF), as defined by Ye (1998 Ye, J. (1998). On measuring and correcting the effects data mining model selection. Journal American Statistical Association 93(441):120–131. [Google Scholar] JASA 93:120–131), represent sensitivity fits to perturbations data. Such GDF can be computed for any statistical model, making it possible, in principle, derive effective number parameters machine-learning approaches thus compute information-theoretical measures fit. We...
Abstract The crisis facing Africa’s elephant populations is a notorious example of ongoing wildlife declines caused by illegal harvesting. Targeted conservation interventions require detailed knowledge about changes in population sizes and the effect activities. However, accurately quantifying poaching intensity difficult task: commonly calculated from ranger‐based carcass‐encounter data, proportion illegally killed elephants (PIKE) function background mortality. Hence, at constant...
Generalised Degrees of Freedom (GDF), as defined by Ye (1998 JASA 93:120-131), represent the sensitivity model fits to perturbations data. As such they can be computed for any statistical model, making it possible, in principle, derive number parameters machine-learning approaches. Defined originally normally distributed data only, we here investigate potential this approach Bernoulli-data. GDF-values models simulated and real are compared complexity-estimates from cross-validation....
Dispersal is crucial for population viability, yet understanding and predicting animal dispersal notoriously difficult. We developed an individual-based model of natal little owl to assess whether individuals from expanding populations in southwestern Germany are able migrate suitable habitat patches northern Switzerland. Our findings reveal plausible inter-individual inter-sexual differences movement behavior suggest that the owl's (re-)colonization Switzerland generally possible, albeit...