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The mother-in-law effect.

John Hunt1, Robert Brooks

  • 1Evolutionary Biology Research Group, Department of Zoology, The University of Western Australia, Nedlands, WA 6907, Australia. john.hunt@unsw.edu.au

Proceedings. Biological Sciences
|April 23, 2004
PubMed
Summary

Mothers can manipulate their sons' mates (daughters-in-law) across generations in dung beetles. This indirect manipulation influences offspring provisioning, demonstrating a novel form of intergenerational social influence in animal behavior.

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Area of Science:

  • Evolutionary biology
  • Animal behavior
  • Social insects

Background:

  • Parental care significantly impacts offspring development and reproductive success.
  • In dung beetles (Onthophagus taurus), maternal provisioning of brood masses influences offspring size and future mating success.
  • Manipulation is a common evolutionary strategy, typically involving direct interactions.

Purpose of the Study:

  • To investigate intergenerational manipulation in dung beetles.
  • To determine if maternal care influences the parental effort of daughters-in-law (DILs).
  • To explore the evolutionary benefits of indirect manipulation across generations.

Main Methods:

  • Observational studies on dung beetle maternal care and offspring development.
  • Experimental manipulation of brood mass size and maternal provisioning.
  • Assessment of DIL parental effort and its correlation with maternal care received by sons.

Main Results:

  • Maternal care, specifically the construction of brood masses, influences the parental effort of the son's mate (DIL).
  • Females can produce large sons from relatively lighter brood masses due to this "mother-in-law effect."
  • Indirect manipulation of DILs, whom the mother does not directly encounter, was demonstrated.

Conclusions:

  • Parental care can exert influence across generations through indirect manipulation of related individuals.
  • The study reveals a novel mechanism of social influence in dung beetles, extending beyond direct interactions.
  • Provisioning lighter brood masses may offer evolutionary advantages by influencing DIL behavior, despite potential trade-offs.

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