Selective Male Mortality in the Red Imported Fire Ant, Solenopsis invicta

@article{Fritz2006SelectiveMM,
  title={Selective Male Mortality in the Red Imported Fire Ant, Solenopsis invicta},
  author={Gary N. Fritz and Robert K Vander Meer and Catherine A. Preston},
  journal={Genetics},
  year={2006},
  volume={173},
  pages={207 - 213}
}
Males in polygyne populations of Solenopsis invicta are primarily sterile diploids and thought to not express the Gp-9 gene coding for a pheromone-binding protein affecting complex social behavior. We examined an aspect of the breeding system hitherto not considered—male Gp-9 genotypes in relation to sperm stored in queens. Four sites with varying frequencies of sympatric monogyne and polygyne colonies were sampled, including sexuals, workers, and broods from four colonies. Most queens were… 
Evidence of Selective Mating and Triploidy Among Two Social Forms of Solenopsis invicta (Hymenoptera: Formicidae)
TLDR
This study examined the genotypes of queens and their stored sperm during a mating flight in Florida where polygyne colonies predominate, and provides evidence of non-random mating.
Social chromosome variants differentially affect queen determination and the survival of workers in the fire ant Solenopsis invicta
TLDR
Evidence is found that the Sb variant of the social chromosome increases the likelihood of female brood to develop into queens and that adult SB/Sb workers, the workers that cull SB/ SB queens, are overrepresented in comparison to SB/SB workers.
Experimental Conversion of Colony Social Organization in Fire Ants (Solenopsis invicta): Worker Genotype Manipulation in the Absence of Queen Effects
TLDR
The results support the conclusion that polygyny in S. invicta is induced by a minimum frequency of colony workers carrying the b allele, and confirm that its expression is independent of queen genotype or history, worker genotypes at genes not linked to Gp-9, and colony genetic diversity.
Male reproductive fitness and queen polyandry are linked to variation in the supergene Gp-9 in the fire ant Solenopsis invicta
TLDR
It is shown that both male reproductive success and facultative polyandry in queens have a simple genetic basis and are dependent on male Gp-9 genotype, and how strong worker-induced selection acting to maintain the G p-9b allele in the polygyne social form may simultaneously result in reduced reproductive fitness for individual sexual offspring.
Potential cause of lethality of an allele implicated in social evolution in fire ants
TLDR
Data are consistent with the hypothesis that the Lys151 residue in GP-9 protein confers the deleterious effects of the b allele in homozygous condition, possibly by impairing the protein’s function through interference with ligand binding/release or hindrance of dimer formation.
The social supergene dates back to the speciation time of two Solenopsis fire ant species
TLDR
The formation of the supergene occurred concomitantly with the process of speciation of the Solenopsis socially-polymorphic clade, and it is hypothesized that the Sb variant first arouse in one incipiently-speciating population and then introgressed into the other populations or species.
Expression of foraging and Gp‐9 are associated with social organization in the fire ant Solenopsis invicta
TLDR
Investigation of levels of expression of two major genes, the odorant binding protein Gp‐9 (general protein‐9) and foraging, in workers and young nonreproductive queens suggested that both genes have independent non‐epistatic effects on behaviour in S. invicta.
Differentiation of Solenopsis invicta social forms using high resolution melt PCR
TLDR
An alternative and highly objective assay based upon a high resolution melt technique following preamplification of a significantly shorter Gp-9 fragment than that required for restriction endonuclease digestion is described, which underpin its suitability for high-throughput testing.
Phenotypic and Genotypic Characters Associated with the Polygyne Hybrid Imported Fire Ant
TLDR
Variants of the monogyne allele, Gp-9 b allele and concordance in the critical amino acid substitutions of the G p-9 locus in the hybrid fire ant with S. invicta Buren provides evidence that polygyny in the Hybrid imported fire ant is derived from this fire ant species.
No mate preference associated with the supergene controlling social organization in Alpine silver ants
TLDR
It is concluded that the pattern of asymmetric assortative mating documented from mature F. selysi colonies in the field is not caused by mate preferences or major genetic incompatibilities between social forms, and there is no evidence that disassortative mate preference contributes to the maintenance of polymorphism at this supergene controlling ant social organization.
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