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Related Concept Videos

Microbial Interactions: Cooperation01:26

Microbial Interactions: Cooperation

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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...
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Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
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Microbial Interactions: Competition01:26

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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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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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Symbiosis00:58

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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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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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Group Size Dependent Selection for Cooperation Versus Freeloading in Collective Chemical Defence.

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Animal behavior

Background:

  • Cooperation in public goods is theorized to evolve faster in smaller groups due to increased individual benefit.
  • Empirical evidence supporting this hypothesis is scarce, primarily limited to microorganisms.
  • Understanding the evolution of cooperative traits requires broader experimental validation.

Purpose of the Study:

  • To investigate the group size-dependency of cooperation in collective defense.
  • To test the hypothesis that cooperation benefits are more pronounced in smaller groups.
  • To examine how individual contributions to collective defense vary with group size.

Main Methods:

  • Studied Neodiprion sertifer (pine sawfly) larvae, a species exhibiting collective defense.
  • Compared survival rates against predation in cooperative groups of varying sizes (5 vs. 20 larvae).
  • Assessed individual participation in collective defense and analyzed potential life-history costs.

Main Results:

  • Survival against predation was higher in cooperative groups, with benefits being more significant in smaller groups.
  • Larvae in larger groups exhibited reduced participation in collective defense.
  • Individual contributions were adjusted based on group size, not solely on resource competition costs.

Conclusions:

  • Cooperation in collective goods is demonstrably group size-dependent, favoring smaller groups.
  • Selection promotes cooperation more effectively in smaller groups.
  • The relative fitness of freeloaders increases in larger groups, potentially hindering cooperation evolution.