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Related Concept Videos

Microbial Interactions: Cooperation01:26

Microbial Interactions: Cooperation

Microbial cooperation involves beneficial interactions in which different species work together for individual or mutual advantage. These interactions can profoundly influence ecological dynamics and evolutionary processes, and they are essential to many pathogenic and symbiotic relationships.Nematode–Bacteria CooperationA striking example is the relationship between the Gram-negative bacterium Xenorhabdus nematophila and the parasitic nematode Steinernema carpocapsae. Juvenile nematodes...
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Microbial Interactions: Competition01:26

Microbial Interactions: Competition

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...
Evolutionary Processes in Microbes01:26

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
Microbial Interactions: Mutualism01:25

Microbial Interactions: Mutualism

Mutualism is a symbiotic interaction in which all participating organisms benefit. These relationships can be obligate or facultative and are fundamental to ecosystem functions across diverse biological systems.Plant–Fungi MutualismOne well-known example is the association between plant roots and mycorrhizal fungi, such as Rhizophagus species. The fungal hyphae penetrate the root hairs and the epidermis, forming an extensive hyphal network that establishes a symbiotic association. Through this...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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Published on: October 29, 2016

Cooperation, competition, and coalitions in enzyme-producing microbes: social evolution and nutrient depolymerization

Henry J Folse1, Steven D Allison

  • 1Department of Ecology and Evolutionary Biology, University of California Irvine, CA, USA.

Frontiers in Microbiology
|October 13, 2012
PubMed
Summary

Microbial communities benefit from extracellular enzymes, but cheating can occur. This study reveals that while diversity can be high, it may reduce nutrient depolymerization due to cooperative cheating.

Keywords:
cooperationdecompositiondensity-dependenceextracellular enzymesfacilitationmicrobenutrient depolymerizationspatial model

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Published on: January 18, 2014

Area of Science:

  • Microbial Ecology
  • Biogeochemistry
  • Evolutionary Biology

Background:

  • Extracellular enzymes are crucial public goods for microbial communities, enabling nutrient acquisition.
  • Microbial communities face challenges from 'cheaters' who exploit shared enzymes without contributing to their production.
  • Understanding the interplay between microbial social dynamics, diversity, and nutrient cycling is vital.

Purpose of the Study:

  • To investigate the relationship between microbial diversity, social interactions, and nutrient depolymerization using a modeling approach.
  • To explore how coalitions and cheating influence spatial patterns and nutrient cycling in microbial communities.
  • To determine the impact of diversity on nutrient depolymerization rates in a model system with complementary resource needs.

Main Methods:

  • Developed a multi-genotype, multi-nutrient model of exoenzyme-producing microbes.
  • Incorporated carbon, nitrogen, and phosphorus polymers, and eight bacterial genotypes with varying enzyme production capabilities.
  • Simulated enzyme production, action, diffusion, and social dynamics to analyze emergent properties.

Main Results:

  • Microbial diversity was maximized at high diffusion or enzyme production rates, but not both.
  • Conditions favoring cheating also promoted the emergence of cooperative coalitions.
  • Increased diversity led to a decline in nutrient depolymerization due to competitive exclusion of generalist producers by coalitions.
  • Cooperation between different microbial types resulted in interwoven, filamentous spatial patterns.

Conclusions:

  • Social interactions, including cooperation and cheating, significantly shape microbial community structure and function.
  • While diversity can be high under certain conditions, it may not always lead to enhanced ecosystem services like nutrient depolymerization.
  • The spatial distribution and nutrient cycling rates are sensitive to the nature of social interactions and resource complementarity within microbial communities.