Smaller brains and optic lobes in reproductive workers of the ant Harpegnathos

Wulfila Gronenberg, Jürgen Liebig

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Most animals show longterm modifications of their behavior which often reflect an adaptation to seasonal variations (e.g., hibernation) or result from changes in the animal's internal state (e.g., estrous cycle or sexual maturity). Such modifications may substantially affect the nervous system [1, 2]. A particularly striking behavioral change can occur in workers of the ant Harpegnathos. A few young workers in the colony may become reproductives and are thus confined to their dark nest chambers, whereas most workers spend their lives as foragers, employing acute vision when hunting prey. This behavioral difference coincides with a marked decrease in brain volume and with an even stronger reduction in the large visual brain centers. Instead of maintaining superfluous brain functions, these ants reduce brain matter which is expensive to support.

Original languageEnglish (US)
Pages (from-to)343-345
Number of pages3
JournalNaturwissenschaften
Volume86
Issue number7
DOIs
StatePublished - Jan 1 1999
Externally publishedYes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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