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Guards and thieves: antagonistic interactions between two ant species coexisting on the same ant-plant
Authors:Nigel E. Raine   Nicola Gammans  Iain J. Macfadyen  Gareth K. Scrivner   Graham N. Stone
Affiliation:Department of Zoology, University of Oxford,;Institute of Cell, Animal and Population Biology, University of Edinburgh,;School of Biological Sciences, Queen Mary, University of London and;NERC Centre for Ecology and Hydrology, CEH Dorset, Winfrith Technology Centre, Dorchester, U.K.
Abstract:Abstract.  1. The simultaneous occupation of a rare understorey ant-acacia Acacia mayana by its guarding ant Pseudomyrmex ferrugineus , and an apparent opportunist parasite of the mutualism, the generalist ant Camponotus planatus is described. The two ant species occur together in 30.7% of the 26 mature A. mayana plants [23.5% of all trees ( n  = 34)] surveyed, but C. planatus is absent from saplings below 1 m in height ( n  = 8).
2. While P. ferrugineus shows behaviour compatible with effective host-tree defence, C. planatus does not attack phytophagous insects and appears ineffective as an ant-guard. Camponotus planatus does, however, occupy swollen thorns (pseudogalls) on the host tree, and harvests nectar from extrafloral leaf nectaries. It is proposed that C. planatus is a parasite of the Acacia–Pseudomyrmex mutualism.
3. Camponotus planatus does not harvest the second trophic reward produced by the tree for its Pseudomyrmex ant-guards, protein-rich food (Beltian) bodies. Camponotus planatus lack the specialised larval adaptations needed to use Beltian bodies as brood food, suggesting that this resource is potentially more resistant to exploitation by generalists than extrafloral nectar.
4. In competition for access to nectaries, C. planatus effectively displaced P. ferrugineus in 99.8% of encounters. These results suggest not only that C. planatus is a parasite of this mutualism, but also that it is able to effectively counteract the aggression shown to other insects by the resident ant-guards.
Keywords:Acacia mayana    Ant–acacia mutualism    Camponotus planatus    exploitation of trophic rewards    extrafloral nectar    opportunist parasite    Pseudomyrmex ferrugineus
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