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Phylogenetic Comparison of Endosymbionts with Their Host Ants Based on Molecular Evidence
The results suggest that the endosymbionts of ants have plural origins, and that in the Camponotini, ancestral symbionts have coevolved with their host ants, which are so divergent to several genera as to construct one tribe.
Characterization of microsatellite loci in red wood ants Formica (s. str.) spp. and the related genus Polyergus
13 microsatellite loci in a red wood ant Formica are developed from random amplified polymorphic DNA fragments to study genetic structure within populations and colonies and suggest that the loci will be useful in evolutionary studies on Formica and Polyergus species.
Sex ratio biases in termites provide evidence for kin selection.
It is shown that kin selection can result in sex ratio bias in eusocial diploids, and this model predicts that allocation will be biased towards the sex that contributes more of its genes to the next generation when sex-asymmetric inbreeding occurs.
Phylogenetic analysis of the insect order Odonata using 28S and 16S rDNA sequences: a comparison between data sets with different evolutionary rates
Character reconstruction analysis suggests that multiple hits at the rapidly evolving sites in the 16S rDNA degenerated the phylogenetic signals of the data set, and the Zygoptera are paraphyletic.
A halictid bee with sympatric solitary and eusocial nests offers evidence for Hamilton's rule.
A direct test of Hamilton's rule is conducted using field populations of Lasioglossum baleicum bees, which inhabit sympatric solitary and eusocial nests, to show that the indirect fitness of sterile first- Brood workers is higher than the direct fitness of solitary first-brood females, and spring foundresses achieve a large direct fitness by having helpers.
Caste specialization in food storage in the dimorphic antColobopsis nipponicus (Wheeler)
SummaryFood-storage abilities of both minor and major workers of the dimorphic antColobopsis nipponicus were examined to prove the hypothesis that major workers of this species have a trophic role in
The Optimal Caste Ratio in Polymorphic Ants: Estimation and Empirical Evidence
  • E. Hasegawa
  • Economics
    The American Naturalist
  • 1 April 1997
The results suggest that the model is useful for estimations of the optimal caste ratio and that the caste ratio in field colonies is tuned to maximize the ergonomic efficiency of the colony as a whole through colony-level selection.
Worker oviposition and policing behaviour in the myrmicine ant Aphaenogaster smythiesi japonica Forel
The results show that a worker's production of males in this species is potentially inhibited by worker policing, contrary to the prediction that worker policing is not predominant in monogynous and monandrous societies.
Cheater genotypes in the parthenogenetic ant Pristomyrmex punctatus
It is reported that cheater genotypes indeed coexist in field colonies of a social insect, the parthenogenetic ant Pristomyrmex punctatus, and this species provides a good model system to investigate the evolution of cooperation in nature.
The study provides the first evidence of LMC in ants with mass nuptial flights and contradicts previous assumptions about breeding structure in swarming ants, and suggests that LMC can affect sex‐allocation patterns for ant colonies and populations.