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Oecologia

, Volume 131, Issue 1, pp 137–144 | Cite as

Arboreal ants as key predators in tropical lowland rainforest trees

  • Andreas Floren
  • Alim Biun
  • Eduard K. Linsenmair
Community Ecology

Abstract.

Ants numerically dominate the canopy fauna of tropical lowland rain forests. They are considered to be key predators but their effects in this regard have only rarely been studied on non-myrmecophytes. A conspicuously low abundance of less mobile, mainly holometabolous arthropods like Lepidoptera larvae corresponds with ant dominance, while hemimetabolous highly mobile nymphs occur regularly and in large numbers in the trees. This is in contrast to the temperate regions where ants are mostly lacking on trees and holometabolous larvae are frequent. In this study we experimentally measured ant predation in the trees by offering caterpillars as baits. Fifty-four ant species were tested, of which 46 killed caterpillars and carried them away to their nests while only eight species ignored the offered larvae. Insecticidal knockdown fogging of ten trees after finishing the prey experiments showed that on average 85% of ant individuals per tree were predacious. With the analysis of another 69 foggings and meticulous observations in many other trees this suggests that arboreal ants are responsible for the low abundance of less mobile arthropods in tropical lowland rain forest canopies. Ant predation was significantly lower in a disturbed forest indicating that human disturbance induces a change in the functional interactions in these ecosystems.

Anthropogenic disturbance Canopy Community structure Ecosystem function Fogging 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • Andreas Floren
    • 1
  • Alim Biun
    • 2
  • Eduard K. Linsenmair
    • 1
  1. 1.Department of Animal Ecology and Tropical Biology, Biozentrum, Am HublandUniversity WuerzburgWuerzburgGermany
  2. 2.Sabah ParksKota KinabaluMalaysia

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