Insectes Sociaux

, Volume 42, Issue 3, pp 255–266 | Cite as

Sexual biology of haploid and diploid males in the bumble beeBombus terrestris

  • M. J. Duchateau
  • J. Mariën
Research Articles

Summary

InB. terrestris diploid males develop normally into adults (Duchateau et al., 1994). The diploid males are similar in appearance to the haploid males, except that they are smaller. The size of the testis of diploid males, relative to the length of the radial cell, is smaller than that of haploid males. There is overlap in the frequency distribution with respect to body size and testis size. The spermatozoa of diploid males are larger than those of the haploids and the vasa deferentia contain fair less spermatozoa than those of haploid males of the same age. Countings and measurements of the spermatozoa, therefore, can give the best indication about the ploidy of the males. Diploid males are successful in mating. They mate at a younger age than haploid males and they die sooner. The number of vial offspring of diploid males, however, is very low. No queen that mated with a diploid male produced a colony, but a few queens did produce some progeny. These might have been triploid males and workers. InB. terrestris higher ploidy results in smaller individuals, whereas in several other species of the Hymenoptera it has been found to result in larger individuals.

Key words

Bombus terrestris diploid males size spermatozoa mating 

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Copyright information

© Birkhäuser Verlag 1995

Authors and Affiliations

  • M. J. Duchateau
    • 1
  • J. Mariën
    • 1
  1. 1.Department of Comparative Physiology, Ethology and Socio-Ecology GroupUniversity of UtrechtTB UtrechtThe Netherlands

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