Related Experiment Video
Updated: Feb 24, 2026
09:32
Oral Bacterial Infection and Shedding in Drosophila melanogaster
Published on: May 31, 2018
12.6K
Spatial disease dynamics of free-living pathogens under pathogen predation
Tommi Mononen1, Lasse Ruokolainen2
1University of Helsinki, Department of Biosciences, Helsinki, FI-00014, Finland. tommi.mononen@helsinki.fi.
Scientific Reports
|August 12, 2017
Summary
Metacommunity interactions, including pathogen-consuming species, can significantly alter disease spread. Introducing consumers can lead to disease-free patches and unexpected decreases in host morbidity, even with pathogen immigration.
Area of Science:
- Ecology
- Epidemiology
- Theoretical Biology
Background:
- Traditional disease dynamics studies focus on host-pathogen interactions.
- The role of broader community interactions in spatial disease spread is often overlooked.
- Free-living pathogens and their consumers add complexity to ecological disease models.
Purpose of the Study:
- To investigate how metacommunity interactions influence spatial epidemiological dynamics.
- To model the effects of a pathogen-consuming species on host-pathogen systems in multiple habitat patches.
- To analyze the impact of consumer and host dispersal on disease prevalence and asymmetry.
Main Methods:
- Development of a deterministic epidemiological model.
- Simulation of two interconnected habitat patches containing hosts, pathogens, and pathogen consumers.
- Analysis of scenarios with isolated patches, consumer dispersal, and host dispersal.
Main Results:
- Isolated patches exhibit periodic disease outbreaks driven by consumer-pathogen cycles.
- Consumer dispersal between patches creates asymmetric disease prevalence, with one patch remaining disease-free.
- Host dispersal leads to indirect pathogen movement, causing a counter-intuitive decrease in morbidity with increased pathogen immigration.
Conclusions:
- Community-level interactions, particularly involving consumers, are critical drivers of spatial disease dynamics.
- Metacommunity processes can generate significant spatial asymmetry in disease prevalence, even in homogeneous environments.
- Understanding these complex interactions is essential for predicting and managing infectious diseases in ecological systems.
More Related Videos
Related Concept Videos
00:57Population Growth
28.8K
Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
28.8K
02:39Predator-Prey Interactions
21.8K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
21.8K
00:48Optimal Foraging
14.1K
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
14.1K
01:25Modeling with Differential Equations
118
Population dynamics can be described mathematically by considering the population size P(t) as a function of time. The rate of change of the population is then represented by the derivative of P(t). A simple assumption is that the rate of growth is proportional to the size of the population itself. This leads to an exponential growth model, where the population increases rapidly without bound. While this is a useful first approximation, it does not reflect realistic long-term...
118
00:54Distribution and Dispersion
25.7K
To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...
25.7K
01:21Frequency-dependent Selection
24.3K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
24.3K