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Related Concept Videos

Symbiosis00:58

Symbiosis

37.7K
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...
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Relationship Formation02:12

Relationship Formation

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What do you think is the single most influential factor in determining with whom you become friends and whom you form romantic relationships? You might be surprised to learn that the answer is simple: the people with whom you have the most contact. This most important factor is proximity. You are more likely to be friends with people you have regular contact with. For example, there are decades of research that shows that you are more likely to become friends with people who live in your dorm,...
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Epiphytes, Parasites, and Carnivores02:40

Epiphytes, Parasites, and Carnivores

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Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
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Social Exchange Theory02:06

Social Exchange Theory

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We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).
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Social Exchange Theory01:26

Social Exchange Theory

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As formulated by John Thibaut and Harold Kelley, Social Exchange Theory explains human relationships as economic-like exchanges that maximize rewards and minimize costs. This theory suggests that individuals engage in relationships to gain benefits and reduce burdens, similar to economic transactions. It has been widely applied to various types of relationships, including romantic, professional, and social interactions.Rewards and Costs in RelationshipsRelationship rewards include emotional...
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Sympathetic Signaling01:31

Sympathetic Signaling

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Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
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Related Experiment Video

Updated: Feb 22, 2026

Investigation of Plant Interactions Across Common Mycorrhizal Networks Using Rotated Cores
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Published on: March 26, 2019

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Sanctions, Partner Recognition, and Variation in Mutualism.

Jeremy B Yoder, Peter Tiffin

    The American Naturalist
    |September 23, 2017
    PubMed
    Summary

    Mutualistic interactions can persist with variation in partner quality. Coevolution of partner signals and host recognition, alongside sanctions, maintains stable symbiotic relationships without eliminating genetic diversity.

    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Behavioral Ecology

    Background:

    • Mutualistic interactions are vulnerable to invasion by "cheaters" (noncooperative individuals).
    • Selection against cheaters should reduce variation in partner quality, yet such variation is common in natural populations.
    • Partner signals, in addition to performance, may influence mutualism stability.

    Purpose of the Study:

    • To model the coevolution of symbiotic mutualism considering both partner performance and signals.
    • To investigate how host sanctions and symbiont signals coevolve.
    • To understand the persistence of genetic variation in mutualistic interactions.

    Main Methods:

    • Developed a model of coevolution in symbiotic mutualism.
    • Incorporated separate genetic loci for host sanctions, host recognition of symbiont signals, symbiont cooperation, and symbiont signal expression.
    Keywords:
    coevolutionmutualismpopulation geneticssymbiosis

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  • Utilized individual-based simulations with population structure.

    • Main Results:

    • Genetic variation in partner quality can persist without destabilizing the mutualistic interaction.
    • Coevolution of symbiont signals and host recognition is influenced by the coevolution of sanctions and cooperation.
    • Dual systems of sanctions and partner recognition can lead to stable mutualism, similar to economic models where incentives initiate symbiosis.

    Conclusions:

    • Mutualisms can maintain variation in partner recognition or sanctioning ability without destabilization.
    • Coevolutionary dynamics of signals and sanctions are crucial for mutualism stability.
    • Studies of mutualism should integrate communication (signals) with the exchange of benefits.