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Social termites use allogrooming to combat fungal infections when innate immunity is weak. This social behavior is crucial for removing pathogenic spores from their cuticle, protecting the colony.

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Area of Science:

  • Ecology
  • Insect behavior
  • Immunology

Background:

  • Social animals rely on allogrooming for parasite defense.
  • In social insects, allogrooming removes pathogenic propagules from the cuticle.
  • Subterranean termites encounter soil-borne fungal spores like Metarhizium.

Purpose of the Study:

  • Investigate differences in social and innate immunity reliance in two related subterranean termite species.
  • Determine how termites protect themselves from Metarhizium fungal infections.
  • Assess termite allogrooming responses to fungal spore contamination.

Main Methods:

  • Comparative study of two closely related subterranean termite species.
  • Exposure to locally encountered Metarhizium fungal species.
  • Observation and quantification of allogrooming behavior.
  • Assessment of innate immune responses.

Main Results:

  • One termite species exhibits weaker innate immunity compared to its relative.
  • This species compensates with more sustained and enhanced allogrooming.
  • Allogrooming increased with routine and heavy Metarhizium conidia contamination.
  • Heavy contamination triggered a networked emergency response involving allogrooming.

Conclusions:

  • Allogrooming is a critical social immune mechanism for subterranean termites, especially when innate immunity is limited.
  • Termites demonstrate adaptable allogrooming strategies to manage different levels of fungal spore exposure.
  • Social immunity, through allogrooming, plays a vital role in protecting termite colonies from fatal fungal infections.