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Partner manipulation stabilises a horizontally transmitted mutualism.

Martin Heil1, Alejandro Barajas-Barron, Domancar Orona-Tamayo

  • 1Departamento de Ingeniería Genética, CINVESTAV-Irapuato, Irapuato, Guanajuato, México.

Ecology Letters
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Summary
This summary is machine-generated.

Acacia trees manipulate their ant partners by using chitinase to inhibit invertase in ant digestive systems. This ensures ants remain dependent on the plant's nectar, strengthening the mutualistic relationship.

Keywords:
Ant-plant interactioncheaterexploiterhost choicehost sanctionmutualismpartner manipulation

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Area of Science:

  • Ecology
  • Biochemistry
  • Evolutionary Biology

Background:

  • Mutualisms are interactions where both species benefit, but can be threatened by exploitation.
  • Acacia-Pseudomyrmex mutualisms involve ants defending plants in exchange for resources.
  • Ants feeding on sucrose-free extrafloral nectar (EFN) become dependent on their Acacia hosts.

Purpose of the Study:

  • To investigate if Acacia hosts actively manipulate the digestive physiology of their Pseudomyrmex ant mutualists.
  • To understand the mechanism behind the ants' specialized diet and dependency on host-provided EFN.

Main Methods:

  • Analyzing the composition of Acacia extrafloral nectar (EFN).
  • Assessing the activity of invertase in Pseudomyrmex ant midguts.
  • Testing the effect of EFN components, specifically chitinase, on ant invertase activity in vitro.

Main Results:

  • Acacia EFN contains chitinase, a dominant protein.
  • Chitinase rapidly inhibits the invertase activity in ant digestive fluids.
  • This enzyme-enzyme interaction creates a dependency, as ants cannot digest sucrose from other sources.

Conclusions:

  • Acacia hosts manipulate ant digestion via chitinase to ensure reliance on host-provided EFN.
  • This partner manipulation enhances the stability and reciprocity of the mutualistic relationship.
  • The study demonstrates phenotypic control within a mutualism, increasing partner dependency.