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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...
Symbiosis00:58

Symbiosis

Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
Microbial Interactions: Parasitism01:22

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Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
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Microbial Interactions: Mutualism01:25

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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...

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In vivo and In vitro Rearing of Entomopathogenic Nematodes (Steinernematidae and Heterorhabditidae)
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Parasites may help stabilize cooperative relationships.

Ainslie E F Little1, Cameron R Currie

  • 1Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA. ainslie.little@gmail.com

BMC Evolutionary Biology
|June 3, 2009
PubMed
Summary

Parasites can stabilize cooperation between species by creating a common enemy. This shared threat encourages mutualistic partners to cooperate, rather than cheat, for mutual benefit.

Area of Science:

  • Evolutionary biology
  • Ecology
  • Symbiosis

Background:

  • Cooperation persistence is an evolutionary paradox, as cheating is often favored.
  • Mutualisms are thought to be maintained by mechanisms to avoid exploitation.
  • The role of additional symbionts, like parasites, in mutualism stability is less understood.

Purpose of the Study:

  • To empirically and theoretically examine how specialized parasites influence the stability of bipartite mutualistic associations.
  • To investigate the interactions between a fungus garden parasite (Escovopsis) and cooperative versus cheating ant-fungus mutualisms.
  • To determine if parasites can stabilize mutualisms by altering the costs and benefits of cooperation.

Main Methods:

  • Empirical study using sub-colonies of fungus-growing ants and their fungal gardens.

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  • Experimental manipulation of cooperative and uncooperative (cheating) ant-fungus pairs under parasitic infection.
  • Iterative Prisoner's Dilemma (IPD) simulations incorporating parasitism.

    • Main Results:

    • Escovopsis-infected sub-colonies with cheating ants or fungi lost significantly more garden biomass than those with infection or cheating alone.
    • The fitness costs of parasitism in non-cooperative mutualisms outweigh the benefits of cheating.
    • IPD simulations confirmed that cooperation becomes a stable strategy when parasites are present.

    Conclusions:

    • Parasitism can act as an external force stabilizing cooperation by aligning mutualist interests against a common enemy.
    • Selection favors cooperation over cheating when mutualists share a common enemy, potentially explaining the evolutionary stability of mutualisms.
    • This study provides evidence for parasites playing a crucial role in maintaining cooperative relationships in nature.