Pheromonal manipulation of workers by a fighting male to kill his rival males in the ant cardiocondyla wroughtonii

  title={Pheromonal manipulation of workers by a fighting male to kill his rival males in the ant cardiocondyla wroughtonii},
  author={K. Yamauchi and Nobuhiro Kawase},

Morphological, Genetic and Behavioural Aspects of Reproduction in the Ant Genus Cardiocondyla

Regular inbreeding without negative effects indicates that sex is not determined by single-locus complementary sex determination in Cardiocondyla, which indicates that colonies regularly adopt alien queens in order to avoid negative effects of inbreeding by increasing genetic variability.

Mandible morphology reflects the type of male antagonism in the ant genus Cardiocondyla (Hymenoptera: Formicidae)

Diversity appears to reflect the diverse reproductive tactics of ergatoid males of different species, with extremely long, anteriorly oriented mandibles associated with indirect killing of adult competitors, while particularly short mandibles possibly constitute an adaptation to a tactic in which ergatoids males crush the cuticle of young rivals.

Male fighting and “territoriality” within colonies of the ant Cardiocondyla venustula

Wingless males of C. venustula use their strong mandibles to kill freshly eclosed rival males and also engage in short fights with other adult males, but show a novel behavior hitherto not reported from social insect males: they spread out in the natal nest and defend “territories” against other males.

Alternative reproductive tactics and their consequences in the ant genus Cardiocondyla

Genetic data suggest that events of outbreeding alternate with inbreeding in the colonies, and this may prevent inbreeding depression in nature, as queens appear to be able to recognize kin from non-kin, and they may prefer to mate with unrelated males when a selection is available.

Decision-making conditions for intra- or inter-nest mating of winged males in the male-dimorphic ant Cardiocondyla minutior

The results suggest that intra-nest mating and the dispersion of the winged males of C. minutior are facultatively determined by the condition of winged females (virginity and relative pupal age) in natal nests.

Insect harem polygyny—the case of Cardiocondyla ants: a comment on Griffin et al. (2019)

It is argued that none of the insect species previously referred to as being harem-polygynous ful-ly exhibits four central characteristics of harem polygyny: sexual size dimorphism, parental care exclusively provided by the females, monandry of females, and long-term social and spatial associations between the dominant male and the females.

Intrasexually selected weapons

  • A. Rico-GuevaraK. Hurme
  • Environmental Science, Biology
    Biological reviews of the Cambridge Philosophical Society
  • 2018
It is conceptualized that there are five ways in which a sexually dimorphic trait, apart from the primary sex traits, can be fixed: sexual selection, fecundity selection, parental role division, differential niche occupation between the sexes, and interference competition.

Male-male competition in ants (Hymenoptera: Formici dae)

Further studies may uncov er additional unknown male competitive tactics and provide a better understanding of sexual selection in ant mal es, and it is believed these studies offer an ideal sys tem to compare male competition in social and non-social insects.

Between fighting and tolerance: reproductive biology of wingless males in the ant Cardiocondyla venustula

It is suggested that male territoriality in C. venustula is an adaptation to the seasonal production of large numbers of female sexuals by multiple mothers, an adaptation that is related to the obligatory lethal combat among co‐occurring males.

Life-history evolution in ants: the case of Cardiocondyla

  • J. Heinze
  • Biology
    Proceedings of the Royal Society B: Biological Sciences
  • 2017
The aim of this review is to bring together the information on life-history evolution in Cardiocondyla and to highlight the suitability of this genus for functional genomic studies of adaptation, phenotypic plasticity, senescence, invasiveness and other key life- history traits of ants.



Evolution of insect societies

The ‘fitness’ of an organism is its capacity to contribute to future populations. One widely used method is to protect a few offspring (parental care); this can be carried to the point where they

Fighting and mating behaviors of dimorphic males in the ant

Cardiocondyla wroughtoni is polygynous, with a mean of 7.0 queens per nest, and forms polycalic colonies, and 2 types of males, alates and ergatoids, are described.

Lethal fighting among dimorphic males of the ant, Cardiocondyla wroughtonii

The authors' observations reveal that the ergatoid males are morphologically and behaviorally highly specialized for fighting, and regularly engage in lethal combat with one another so that there is typically only a single ergatoids male per nest.