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Related Concept Videos

Microbial Interactions: Competition01:26

Microbial Interactions: Competition

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Microbial competition is an ecological interaction in which microorganisms vie for limited resources within shared environments. These resources may include nutrients, space, or light, depending on the system. The intensity and outcome of competition are influenced by the environmental context, such as nutrient availability, spatial constraints, and the diversity of microbial species present. These competitive interactions significantly influence the structure, function, and resilience of...
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Competition02:34

Competition

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When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
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Predator-Prey Interactions02:39

Predator-Prey Interactions

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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.
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Microbial Interactions: Predation01:28

Microbial Interactions: Predation

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Microbial predation refers to the process by which one microorganism kills and consumes another to obtain nutrients and energy. It encompasses both bacterial and protozoan predators. This interaction plays a crucial role in shaping microbial communities and regulating nutrient cycling.Bacterial Predators: Epibiotic vs. EndobioticBacterial predators are classified based on their mode of attack as either epibiotic or endobiotic. Epibiotic predators, such as Vampirococcus, attach to the surface of...
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Speciation Rates01:07

Speciation Rates

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Overview
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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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.
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An Experimental Model to Study Tuberculosis-Malaria Coinfection upon Natural Transmission of Mycobacterium tuberculosis and Plasmodium berghei
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Competition-mediated feedbacks in experimental multispecies epizootics.

Tad Dallas, Richard J Hall, John M Drake

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    Competition from a non-susceptible species can alter disease spread. This study reveals that competitor density impacts infection dynamics, with intermediate levels peaking disease prevalence in the susceptible host.

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    Area of Science:

    • Ecology
    • Epidemiology
    • Infectious Disease Dynamics

    Background:

    • Competition shapes ecological communities and host-pathogen interactions.
    • Environmentally transmitted pathogens are influenced by competitors affecting host density, stress, and transmission.
    • Non-susceptible competitors can increase, decrease, or have no net effect on infection prevalence.

    Purpose of the Study:

    • To investigate how resource competition with a non-susceptible competitor influences fungal microparasite infection dynamics in a susceptible host.
    • To test the effects of competitor density on infection prevalence and host population dynamics.

    Main Methods:

    • Coupling an epidemiological model with experimental epidemics.
    • Utilizing a non-susceptible competitor (Daphnia pulicaria) and a susceptible host (D. dentifera) infected by a fungal microparasite (Metschnikowia bicuspidata).

    Main Results:

    • Competitor density mediates the effect of competition on infection dynamics, with peak infection prevalence at intermediate densities.
    • Low competitor densities reduced infection by removing fungal spores.
    • High competitor densities increased infection by altering host foraging and reducing host population size.

    Conclusions:

    • A trade-off exists between a competitor's role in reducing pathogen load and its impact on susceptible host foraging and population size.
    • Competitor density can alternately enhance or dampen local epidemics.
    • Resource competition dynamics are critical in understanding host-pathogen interactions in ecological communities.