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Transposon-insertion Sequencing as a Tool to Elucidate Bacterial Colonization Factors in a Burkholderia gladioli Symbiont of Lagria villosa Beetles
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Raiders from the sky: slavemaker founding queens select for aggressive host colonies.

Tobias Pamminger1, Andreas P Modlmeier, Stefan Suette

  • 1Institute of Zoology, Johannes Gutenberg University, Johannes von Müller Weg 6, 55099 Mainz, Germany. pamminge@uni-mainz.de

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Slavemaking ants avoid parasitized areas and target less aggressive host colonies. High host aggression is crucial for survival, as slavemaker invasion acts as a strong selection pressure.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Animal Behavior

Background:

  • Host-parasite interactions drive coevolutionary arms races, leading to specialized adaptations in both species.
  • Aggression is a key behavioral trait influenced by selection pressures in social parasite-host systems.

Purpose of the Study:

  • To investigate the impact of slavemaking ants and nest density on the aggression of Temnothorax longispinosus ants.
  • To understand how host aggression and demography influence the founding decisions and success of slavemaker ants.

Main Methods:

  • A field manipulation experiment was conducted to assess host ant aggression.
  • The study utilized an early slavemaker mating flight to observe founding decisions and success rates.

Main Results:

  • Slavemaker queens avoided founding colonies in areas with existing parasitism.
  • Parasite queens were more successful in capturing brood from less aggressive host colonies.
  • Host colony aggression levels remained stable and did not significantly change in response to experimental manipulation.

Conclusions:

  • Slavemaker nest foundation acts as a significant selective event, favoring high aggression in host colonies.
  • Approximately one-fifth of host colonies were successfully invaded, highlighting the selective pressure for increased host aggression.