
Martin ZwanzigTU Dresden | TUD · Institute of Forest Growth and Forest Computer Sciences
Martin Zwanzig
Dr. rer. nat.
About
20
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Introduction
I am an ecological modeller and theoretical ecologist particularly interested in the evolution of ecological interactions and how plastic behaviour of individuals affects populations, communities and ecosystem resilience. Besides statistical and top-down approaches, I develop and analyze individual-based models to investigate the bottom-up mechanisms that define the structure and dynamics of ecological systems.
Publications
Publications (20)
Some plasmids can be transferred by conjugation to other bacterial hosts. But almost half of the plasmids are non-transmissible. These plasmid types can only be transmitted to the daughter cells of their host after bacterial fission. Previous studies suggest that non-transmissible plasmids become extinct in the absence of selection of their encoded...
Understanding the evolutionary forces that maintain antibiotic resistance genes in a population, especially when antibiotics are not used, is an important problem for human health and society. The most common platform for the dissemination of antibiotic resistance genes is conjugative plasmids. Experimental studies showed that mutations located on...
Understanding the structure, basic properties and relationships in a given dataset is a fundamental prerequisite for an appropriate statistical analysis. Here, we highlight the major principles of data exploration and provide a roadmap for a systematic and reproducible analysis based on key questions. Using an exemplary dataset on throughfall measu...
Many antibiotic resistance genes are associated with plasmids. The ecological success of these mobile genetic elements within microbial communities depends on varying mechanisms to secure their own propagation, not only on environmental selection. Among the most important are the cost of plasmids and their ability to be transferred to new hosts thr...
# Key Message #
Here, we present a workflow for determining the optimal tree height model and calibration design for forests affected to varying degrees by anthropogenic disturbance. For mixed Araucaria-Nothofagus forests, tree height predictions in newly surveyed stands are most accurate and effective when the height of up to five random trees i...
Shrubland ecosystems cover a large part of the five Mediterranean regions of the world, and monitoring their biomass is crucial for assessing fire risk and carbon sequestration. However, biomass models for multi-stemmed shrubs remain scarce, making the quantitative assessment of shrubland biomass imprecise and often unreliable. Here, we measured, h...
Aim of the study: The aim of this study is to provide information on species-specific basic wood density (g cm-3) and moisture content (%) in Mediterranean shrublands.
Area of study: The study covers two sites of the sclerophyllous shrubland in central Chile, Cortaderal (34°35’S 71°29’W) and Miraflores (34°08’S 70°37’W), characterized by different...
The occurrence of natural root grafts, the union of roots of the same or different trees, is common and shared across tree species. However, their significance for forest ecology remains little understood. While early research suggested negative effects of root grafting with the risk of pathogen transmission, recent evidence supports the hypothesis...
Estimating carbon stocks in wooded systems is crucial to quantify national greenhouse gas balance estimates. However, inaccurate estimates are likely due to the divergent architecture of many species. The monkey puzzle tree Araucaria araucana, with its umbrella-like architecture is a vivid example. This species, often found in monodominant stands a...
The occurrence of natural root grafts, the functional union of roots of the same or different trees 1–3 , is common and shared across tree species ² . However, their significance for forest ecology remains little understood. While early research suggested negative effects of root grafting (i.e. increases the risk of pathogen transmission) 4,5 , rec...
A key source of genetic variation of microbial populations are plasmids: extrachromosomal genetic elements that replicate autonomously and can be highly mobile between individual cells. Diverse plasmids were found in environmental samples and bacterial populations. Here we explore the mechanisms that help to preserve this gene pool as a fundamental...
It has long been recognized that single-trees, as major components of forest ecosystems, change the distribution of resources due to the abundance and the structure of their canopies. This includes both the vertical and horizontal dimensions of plant parts, such as the canopy, the stem, and the root system, as well as the changes in spatial propert...
This supplemental material provides a more detailed description of the model system presented in the main article (Zwanzig at al. 2019 https://doi.org/10.1128/MSYSTEMS.00186-18) as well as all supplemental figures S1, S2, S3 and S4. We deployed our model using the R-package shiny and the hosting service 'shinyapps.io', which allows the user to para...
Aim Little is known about how N and P co-limited ecosystems respond to single nutrient enrichment. This work assesses the susceptibility of above- and belowground ecosystem components and of their linkages in an N and P co-limited pasture to N- and P-enrichment. We tested if the plants’ responses can be explained by the concept of serially linked n...
The limited and seasonally variable availability of water and its inefficient distribution in the crop lands are still unsolved problems in agriculture. Sensor-based deficit irrigation (DI), where a sensor is used to detect the soil water status and irrigation is provided according to certain threshold values, is one strategy to address that issue....
The limited and seasonally variable availability of water and its efficient distribution when growing crops is still an unsolved problem in agriculture. Sensor-based deficit irrigation (DI), where a sensor is used to detect the soil water status and irrigation is provided according to certain threshold values, is one strategy to address that issue....