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Insectes Sociaux

, Volume 31, Issue 1, pp 87–102 | Cite as

The reproductive cycle of the queenless ant pristoMyrmex pungens

  • Tomio Itow
  • Kazuhiro Kobayashi
  • Masao Kubota
  • Kazuo Ogata
  • Hirotami T. Imai
  • Ross H. Crozier
Article

Summary

The life cycle of the myrmicine antPristomyrmex pungens was investigated. Colonies of this species are usually composed of several thousand small workers, although a few males (2–3 %) occasionally appear during June and July in mature colonies, and large workers with ocelli and abortive spermathecae (here termedergatoid queens) were observed extremely rarely. We found that the virgin small workers can lay eggs and that these develop into further small workers. Cerebral ganglion cells and oogonial cells had the diploid chromosome number (2 n=24), but the haploid number (n=12) was observed in oocytes at pachytene, and also in spermatocytes from the rare males. Males have functionally normal copulatory organs and their spermatogenesis is normal, but they probably do not mate, because small workers have no spermatheca and their copulatory organs are degenerative. These observations indicate that reproduction inP. pungens is carried out predominatly or, probably, wholly by the small workers and hence is thelytokous. We discuss the evolution of theP. pungens life cycle, pointing out the difficulty of applying the “queen” concept to this species or even in deciding whether or not it is “eusocial”. In view of the apparent genetic isolation between colonies, the mode of selection maintaining sociality in this case is probably interdemic group selection rather than kin selection.

Keywords

Reproductive Cycle Group Selection Nous Avons Genetic Isolation Cerebral Ganglion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Cycle reproductif d'une colonie sans reine de pristomyrmex pungens

Resume

Nous avons étudié le cycle biologique de la fourmi myrmicinePristomyrmex pungens. En général, les colonies de cette espèce se composent de plusieurs milliers de petites ouvirères, tandis qu'un petit nombre de mâles (2–3 %) apparaissent occasionnellement en juin et juillet dans les colonies mûres et que de grandes ouvrières à ocelles et spermathèque abortive (reines ergatoïdes) ont pu être observées très rarement. Nous avons démontré que les petites ouvrières vierges peuvent pondre des œufs qui donnent d'autres petites ouvrières. Les cellules des ganglions cérébroïdes et les ovogonies des ouvrières sont diploïdes (2 n=24), mais la formule haploïde (n=12) a pu être observée chez les ovocytes au stade pachytène ainsi que chez les spermatocytes des mâles. Ces mâles possèdent des organes copulatoires normaux et leur spermatogenèse est normale, mais ils ne fécondent probablement pas les petites ouvrières, lesquelles sont dépourvues de spermathèque et d'organes copulatoires fonctionnels. Ces observations indiquent que la reproduction chezP. pungens est assumée de façon prépondérante, et probablement complètement, par les petites ouvrières, de façon par conséquent thélytoque. Nous discutons l'évolution du cycle biologique deP. pungens, en soulignant la difficulté d'appliquer à cette espèce le concept de “reine” ou même de décider si elle est »eusociale» ou non. Au regard de l'isolement génétique présumé entre colonies, le mode de sélection maintenant dans ce cas une structure sociale est probablement davantage une sélection de groupe interdémique plutôt qu'une sélection de parentèle.

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Copyright information

© Masson 1984

Authors and Affiliations

  • Tomio Itow
    • 1
  • Kazuhiro Kobayashi
    • 1
  • Masao Kubota
    • 2
  • Kazuo Ogata
    • 3
  • Hirotami T. Imai
    • 4
  • Ross H. Crozier
    • 5
  1. 1.Department of Biology, Faculty of EducationShizuoka UniversityShizuokaJapan
  2. 2.Odawara, Kanagawa-kenJapan
  3. 3.Faculty of AgricultureKyushu UniversityFukuokaJapan
  4. 4.National Institute of GeneticsMishima, Shizuoka-kenJapan
  5. 5.School of ZoologyUniversity of New South WalesKensingtonAustralia

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