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Insectes Sociaux

, Volume 14, Issue 1, pp 13–24 | Cite as

Studies of caste differentiation inMyrmica rubra L.

Maternal environment and the caste bias of larvae
  • M. V. Brian
  • A. F. Kelly
Article

Summary

  1. 1.

    Temperature, food and photoperiod have been varied during the culture of queens ofMyrmica and the influence of this on the caste properties of their eggs assessed.

     
  2. 2.

    Temperatures of 20° C lead to greater proportions of worker biased brood than those of 25° C if the eggs and larvae are cultured at 22° C. This is associated with the laying at 20° C of fewer eggs with greater periodicity and with a higher survival in subsequent culture at 22° C so that though fewer eggs are laid more brood results than at 25° C. Egg size differences are immaterial and cannot account for the difference. Evidence is given which suggests that it is the step up in temperature from 20° C to 22° C that leads to more metamorphosis than with the treatment that steps down from 25° C to 22° C. Some differential survival is also possible. The importance of these temperature results in the annual cycle is stressed.

     
  3. 3.

    Food and photoperiod were not found to affect caste potentiality significantly.

     

Keywords

Great Proportion Annual Cycle High Survival Size Difference Differential Survival 
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.

Sommario

  1. 1.

    Si sono variati temperature, cibo e fotoperiodo durante la coltura di regine diMyrmica, e s'è estimata l'influenza di questa variazione sulle proprietà di casta delle loro nova.

     
  2. 2.

    Le temperature di 20° C menano a proporzioni più grandi di covata inclinata a divenire operaie che quelle di 25° C se le nova e le larve sono in coltura a 22° C. Questi s'associa col fore, a 20° C, poche nova con una più grande periodicità ed una sopravvivenzo superiore nella coltura seguente a 22° C. Così, benchè poche nova siana fatte un covata più grande segue. Le differenze nella grandezza delle nova non importano e non possono spiegare questa differenza. Si dà dell' evidenza che lascia supporre che sia l'elevazione della temperatura da 20° C a 22° C che mena ad una metamorfosi più grande che la riduzione da 25° C a 22° C. Una certa sopravvivenza differenziale è possibile. Si sottolinea l'importanza di questi risoltati di temperatura nel ciclo annuale.

     
  3. 3.

    S'è trovato che il cibo ed il fotoperiodo non influenzano significativamente la potenzialità di casta.

     

Résumé

  1. 1.

    On a varié la température, la nourriture et la photopériode pendant la culture des reines deMyrmica; ensuite on a évalué l'influence de cette variation sur les attributs de caste de leurs œufs.

     
  2. 2.

    Les températures de 20° C mènent à de plus grandes proportions de couvain prédisposé à devenir ouvrières que celles de 25° C si les œufs et les larves sont en culture à 22° C. On peut lier ceci avec le fait qu'à 20° C les reines pondent moins d'œufs, mais plus souvent et avec une supérieure survivance pendant la culture suivante à 22° C; donc, bien que moins d'œufs soient pondus, un plus grand nombre de larves en est le résultat qu'à 25° C. Les différences dans la taille des œufs n'importent pas et ne peuvent pas expliquer cette différence. On soumet de l'évidence qui suggère que ce soit l'élévation de la température de 20° C jusqu'à 22° C qui mène à une plus grande métamorphose que la baisse de 25° C à 22° C. Il se peut qu'il y ait aussi une certaine survivance différentielle. On souligne l'importance de ces résultats de température au cours du cycle annuel.

     
  3. 3.

    On a trouvé que la nourriture et la photopériode n'influent pas grandement sur la potentialité de caste.

     

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References

  1. Bier (K.), 1954. — Ueber den Saisondimorphismus der Oogenese vonFormica rufa rufo-pratensis minor Gössw. und dessen Bedeutung für die Kastendetermination.Biol. Zbl.,73, p. 170–190.Google Scholar
  2. Brian (M. V.), 1962. — Studies of caste differentiation inMyrmica rubra L., 5. Social conditions affecting early larval differentiation.Ins. Soc.,9, p. 295–310.—Brian (M. V.), 1963. Studies of caste differentiation inMyrmica rubra L., 6. Factors influencing the course of female development in the early third instar.Ins. Soc.,10, p. 91–102. —Brian (M. V.), 1965a. Caste differentiation in social insects.Symp. Zool. Soc. Lond.,14, p. 13–38.—Brian (M. V.), 1965b. Studies of caste differentiation inMyrmica rubra L., 8. Larval developmental sequences.Ins. Soc.,12, p. 347–362.Google Scholar
  3. Brian (M. V.) andHibble (J.), 1964. — Studies of caste differentiation inMyrmica rubra L., 7. Caste bias, queen age and influence.Ins. Soc.,11, p. 223–238.Google Scholar
  4. Weir (J. S.), 1958. — The effect of temperature variation on queen oviposition and colony foundation inMyrmica.J. ins. Physiol.,1, p. 352–360.CrossRefGoogle Scholar

Copyright information

© Masson & Cie 1967

Authors and Affiliations

  • M. V. Brian
    • 1
  • A. F. Kelly
    • 1
  1. 1.Natural Environment Research CouncilFurzebrook Research StationWareham

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