Reproduction, dominance, and caste

Endocrine profiles of queens and workers of the ant Harpegnathos saltator

Clint Penick, Juergen Liebig, Colin S. Brent

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The regulation of reproduction within insect societies is a key component of the evolution of eusociality. Differential patterns of hormone levels often underlie the reproductive division of labor observed among colony members, and further task partitioning among workers is also often correlated with differences in juvenile hormone (JH) and ecdysteroid content. We measured JH and ecdysteroid content of workers and queens of the ant Harpegnathos saltator. In this species, new colonies are founded by a single queen, but after she dies workers compete in an elaborate dominance tournament to decide a new group of reproductives termed "gamergates." Our comparisons revealed that queens, gamergates, and inside workers (non-reproductive) did not differ in levels of JH or ecdysteroids. However, increased JH and decreased ecdysteroid content was observed in outside workers exhibiting foraging behavior. Application of a JH analog to virgin queens of H. saltator, although effective at inducing dealation, failed to promote egg production. Together, these results support the hypothesis that JH has lost its reproductive function in H. saltator to regulate foraging among the worker caste.

Original languageEnglish (US)
Pages (from-to)1063-1071
Number of pages9
JournalJournal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology
Volume197
Issue number11
DOIs
StatePublished - Nov 2011

Fingerprint

Juvenile Hormones
Ants
caste
juvenile hormones
queen insects
Social Class
Ecdysteroids
ecdysteroids
hormone
ant
Reproduction
gamergate
foraging
insect colonies
polyethism
juvenile hormone analogs
eusociality
worker caste
egg production
labor division

Keywords

  • Colony growth-rate
  • Division of labor
  • Dominance
  • Ecdysone
  • Juvenile hormone

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Behavioral Neuroscience

Cite this

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