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Species recognition limits mating between hybridizing ant species.

Pierre Blacher1, Sacha Zahnd1, Jessica Purcell2

  • 1Departement of Ecology and Evolution, University of Lausanne, Lausanne, CH-1015, Switzerland.

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Summary

Two ant species, Formica selysi and Formica cinerea, exhibit strong premating isolation due to cuticular hydrocarbon (CHC) differences, preventing extensive hybridization despite a lack of postmating barriers.

Keywords:
Assortative matingFormica antshybrid zonehydrocarbon cuesspeciationspecies recognition

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Area of Science:

  • Evolutionary biology
  • Speciation research
  • Behavioral ecology

Background:

  • Hybridization is a key process in speciation.
  • Understanding reproductive isolation mechanisms is crucial.
  • Ants Formica selysi and Formica cinerea hybridize in Switzerland.

Purpose of the Study:

  • Investigate premating and postmating barriers to hybridization.
  • Identify cues involved in species recognition.
  • Examine the role of cuticular hydrocarbons (CHCs) in reproductive isolation.

Main Methods:

  • Choice experiments to assess mating preferences.
  • Field observations of hybrid zones and hybrid viability.
  • Cuticular hydrocarbon (CHC) profile analysis.
  • Dyadic encounters between workers for species discrimination.

Main Results:

  • No temporal isolation observed between species.
  • Queens and males showed strong conspecific mating preference.
  • No postmating barriers (genetic incompatibilities) detected; hybrids were viable.
  • CHC profiles differed between species but were similar between F. cinerea and hybrids.
  • Workers discriminated between species but not between F. cinerea and hybrids.

Conclusions:

  • Premating isolation in ants is primarily driven by CHC-based recognition.
  • This recognition system facilitates species boundaries independently of hybridization costs.
  • CHC-based mate recognition is a significant factor in maintaining ant species integrity.