Foraging energetics of the ant, Paraponera clavata

Jennifer Fewell, Jon Harrison, John R B Lighton, Michael D. Breed

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

The energy currencies used by foraging animals are expected to relate to the energy costs and benefits of resource collection. However, actual costs of foraging are rarely measured. We measured the ratio of energetic benefit relative to cost (B/C) during foraging for the giant tropical ant, Paraponera clavata. The B/C ratio was 3.9 for nectar-foragers and 67 for insect prey foragers. In contrast, the B/C ratio during foraging for seed harvester ants (Pogonomyrmex occidentalis) is over 1000, demonstrating that the B/C ratio can vary widely among ants. The B/C ratio was 300 times lower for nectar-foraging Paraponera than for the seed-harvesting Pogonomyrmex because of: (1) a 5-fold lower energetic benefit per trip, (2) a 10-fold greater cost due to longer foraging distances, and (3) a 6-fold greater energy cost per meter due to larger body size. For Paraponera daily colonial energy intake rates are similar to expeditures and may limit colony growth and reproduction. In contrast, for Pogonomyrmex energy intake rates are an order of magnitude higher than estimated costs, suggesting that Pogonomyrmex colonies are unlikely to be limited by short-term energy intake. We suggest that variation in individual B/C ratios may explain why the foraging behavior of Paraponera but not Pogonomyrmex appears sensitive to foraging costs.

Original languageEnglish (US)
Pages (from-to)419-427
Number of pages9
JournalOecologia
Volume105
Issue number4
DOIs
StatePublished - Mar 1996

Keywords

  • Ant
  • Energetics
  • Foraging
  • Paraponera
  • Pogonomyrmex

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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