The effect of queen-worker conflict on caste determination in the bumblebee Bombus terrestris

J. Cnaani, G. E. Robinson, G. Bloch, D. Borst, A. Hefetz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Endocrine analyses were used to investigate the well-known association between queen production and the onset of worker reproduction (termed the competition phase, CPh) in Bombus terrestris. Larvae that reached the age of 5 days before the CPh had a worker-like profile: low juvenile hormone (JH) biosynthesis rates and low JH hemolymph titers. In contrast, larvae that reached the age of 5 days during the CPh had a queen-like profile: high JH biosynthesis rates and high hemolymph JH levels. Larval fate could be manipulated by transplanting egg cells into host colonies with different social structures. There was a steep rise in JH production in larvae transplanted into colonies near or during the CPh. This indicates that during colony development, larvae switch from the 'worker developmental pathway' to the 'queen developmental pathway,' and that the switch is socially regulated. In small rearing groups, larvae reared with queens before the CPh developed into workers, whereas those reared with queens after the CPh developed into queens. Variation in worker type (naive or experienced) did not affect caste determination. Therefore, we hypothesize that queens produce a pheromone that directly inhibits queen differentiation by larvae. We also present two alternative scenarios that explain the timing of gyne production in B. terrestris, one based on ecological constraints and the other based on queen-worker competition.

Original languageAmerican English
Pages (from-to)346-352
Number of pages7
JournalBehavioral Ecology and Sociobiology
Volume47
Issue number5
DOIs
StatePublished - Apr 2000
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements This research was partly supported by the Binational Agriculture Research and Development (BARD) grant No. IS-2306–93 (to AH and GER). The experiments conducted in this research comply with the current laws of the State of Israel.

Keywords

  • Bombus terrestris
  • Bumblebees
  • Caste determination
  • Juvenile hormone
  • Queen-worker conflict

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