A5057274507- Animal Behavior and Reproduction
- Nonlinear Dynamics and Pattern Formation
- Plant and animal studies
- Avian ecology and behavior
- Cellular Automata and Applications
- Theoretical and Computational Physics
- Ecosystem dynamics and resilience
- Amphibian and Reptile Biology
- Quantum chaos and dynamical systems
- Numerical methods for differential equations
- Mathematical and Theoretical Epidemiology and Ecology Models
- Genetic diversity and population structure
- Environmental DNA in Biodiversity Studies
- Species Distribution and Climate Change
- Bird parasitology and diseases
- Advanced Numerical Methods in Computational Mathematics
- Differential Equations and Numerical Methods
- stochastic dynamics and bifurcation
- Slime Mold and Myxomycetes Research
- Plant and Biological Electrophysiology Studies
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Real-Time Systems Scheduling
- Clostridium difficile and Clostridium perfringens research
- Advanced Differential Equations and Dynamical Systems
- Family and Disability Support Research
Regensburg University of Applied Sciences
2022-2023
University of Pittsburgh
2020-2022
X-Fab (Germany)
2021
Carl von Ossietzky Universität Oldenburg
2013-2020
Rocky Mountain Institute
2019
University of Kentucky
2008-2017
Personality (consistent differences between individuals in behavior) and plasticity (changes within are often viewed as separate opposing phenomena. We tested this idea by analyzing parental care reaction norms a bird that exhibits biparental care. provisioning behavior existed () persisted despite being reduced after accounting for individual environment. Plasticity was also evident differed the sexes. Male visit rate associated with changes brood size time of day, but female nestling age...
pde2path is a free and easy to use Matlab continuation/bifurcation package for elliptic systems of PDEs with arbitrary many components, on general two dimensional domains, rather boundary conditions. The based the FEM pdetoolbox, explained by number examples, including Bratu’s problem, Schnakenberg model, Rayleigh-Benard convection, von Karman plate equations. These serve as templates study new problems, which user has provide, via function files, description geometry, conditions,...
For a Selkov--Schnakenberg model as prototype reaction-diffusion system on two dimensional domains, we use the continuation and bifurcation software \tt pde2path to numerically calculate branches of patterns embedded in patterns, for instance hexagons stripes vice versa, with planar interface between patterns. We Ginzburg--Landau reduction approximate locations these by Maxwell points associated system. our basic model, some but not all show snaking behavior parameter space, over given...
Abstract Individuals within a population often exhibit consistent differences in important behavioral traits such as parental care. One interesting, yet largely unexplored explanation for the existence of these among parents is idea that cognitive between individuals could lead to between‐individual variation parenting behavior. I used wild house sparrows ( Passer domesticus ) test nature relationship aspects ability (problem‐solving performance and learning) care behavior, both measured...
Abstract We investigated the link between heterozygosity and reaction norm attributes of reproductive performance in female house sparrows ( Passer domesticus ). collected data on clutch size, egg hatching success nestling survival 2816 nesting attempts made by 791 marked individuals over a 16‐year period. Pedigree analysis revealed no evidence inbreeding. Neither parent–offspring regression nor an animal model significant heritability or size. selected 42 females that laid at least seven...
Host species that can independently maintain a pathogen in host community and contribute to infection other are important targets for disease management. However, the potential of is not fixed over time, an challenge understanding how within- across-season variability maintenance affects persistence longer time scales relevant management (e.g., years). Here, we sought understand causes consequences seasonal dynamics leopard frogs (Rana sphenocephala Rana pipiens) infected with fungal...
Abstract Recent studies of extra‐pair paternity have found support for the idea that heterozygous males an advantage in siring offspring. Most use DNA microsatellite loci to determine and then same estimate individual heterozygosity. However, because likelihood detecting offspring depends on combinations parental alleles, it is possible biases arise from particular allele combinations. This might produce false influence heterozygosity mating behaviour. We used a simulation model assess how...
Accurate detection of the amphibian fungal pathogen Batrachochytrium dendrobatidis (Bd) is critical for wildlife disease research; however, false negatives in do occur. Here we compared different DNA extraction methods to determine threshold Bd and identify an optimal method improve quantification pathogen. We extracted both lab-created cell suspension standards using PrepMan Ultra, Chelex resin, 3 spin column kits (Qiagen DNeasy Blood Tissue, Zymo Quick miniprep, IBI gMAX mini kit), further...
Abstract Parents of many species provide multiple forms care to their offspring. In birds, parents often provision offspring with food and defend them from predators and/or nest‐site competitors. We tested how these two parental covary in a wild population house sparrows ( P asser domesticus ). Using behavioral reaction norm approach, we found that nestling provisioning exhibited between individual differences positively covaried measure nest defense: the propensity attack heterospecific box...
We study numerically the cubic-quintic-septic Swift-Hohenberg (SH357) equation on bounded one-dimensional domains. Under appropriate conditions stripes with wave number $k\approx 1$ bifurcate supercritically from zero state and form S-shaped branches resulting in bistability between small large amplitude stripes. Within this range we find stationary heteroclinic connections or fronts stripes, demonstrate that associated spatially localized defect-like structures either snake fall isolas. In...
We study steady states in a reaction-diffusion system for benthic bacteria-nutrient model marine sediment over 1D and 2D domains by using Landau reductions numerical path following methods. point out how the reacts to changes of strength food supply ingestion. find that has stable homogeneous state relatively large rates ingestion, while this becomes unstable if one these decreases Turing patterns such as hexagons stripes start exist. One main results present work is global bifurcation...
Eastern bluebird (Sialia sialis) populations are increasing across most of the species' range; however, we document a decline in population central Kentucky, where state and local Christmas Bird Count Breeding Survey data indicate bluebirds declining throughout Ohio River valley region. We examined several possible hypotheses for this decline, including habitat loss, nest cavity increased competition from other species, variation winter temperature using long term nesting gathered at one...
pdepath 2.0 is an upgrade of the continuation/bifurcation package pde2path for elliptic systems PDEs over bounded 2D domains, based on Matlab pdetoolbox. The new features include a more efficient use FEM, easier switching between different single parameter continuations, genuine multi-parameter continuation (e.g., fold continuation), implementation nonlinear boundary conditions, cylinder and torus geometries (i.e., periodic conditions), general interface adding auxiliary equations like mass...
Abstract Infectious disease systems frequently exhibit strong seasonal patterns, yet the mechanisms that underpin intra‐annual cycles are unclear, particularly in tropical regions. We hypothesized host immune function fluctuates seasonally, contributing to oscillations infection patterns a system. To test this hypothesis, we investigated key defense of amphibians against lethal fungal pathogen, Batrachochytrium dendrobatidis ( Bd ). integrated two field experiments which perturbed amphibian...
Abstract Biological hypotheses predicting patterns of offspring begging typically concern the covariance with hunger and/or development at specific hierarchical levels. For example, drives within-individual begging, but also food intake among individuals within broods, and can covary positively or negatively genotypes broods. Testing biological phenomena that occur multiple levels, therefore, requires partitioning between traits interest to ensure each level-specific relationship is...
Third-order amplitude equations on hexagonal lattices can be used for predicting the existence and stability of stripes, up-hexagons, down-hexagons in pattern-forming systems. These predict nonexistence bistable ranges between up- tristable up-, down-hexagons. In present work we use fifth-order finding such a generalized Swift-Hohenberg equation discuss stationary front connections
We describe an adoption event by a female Eastern Bluebird (Sialia sialis) and suggest mechanism which could be adaptive. The foster adopted three young we were able to quantify two measures of parental care (nestling provisioning nest defense). successfully reproduced with the father in same location later breeding season. adopting may increasing her fitness gaining future reproduction fertile mate at productive box through for that are not related.
pde2path is a free and easy to use Matlab continuation/bifurcation package for elliptic systems of PDEs with arbitrary many components, on general two dimensional domains, rather boundary conditions. The based the FEM pdetoolbox, explained by number examples, including Bratu's problem, Schnakenberg model, Rayleigh-Benard convection, von Karman plate equations. These serve as templates study new problems, which user has provide, via function files, description geometry, conditions,...