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The plant-ant Camponotus schmitzi helps its carnivorous host-plant Nepenthes bicalcarata to catch its prey

Published online by Cambridge University Press:  17 December 2010

Vincent Bonhomme ,
Isabelle Gounand ,
Christine Alaux ,
Emmanuelle Jousselin ,
Daniel Barthélémy  and
Laurence Gaume
Vincent Bonhomme*
Affiliation:
Université Montpellier II, CNRS, INRA, UMR AMAP: Botanique et Bioinformatique de l'Architecture des Plantes, CIRAD – TA A51/PS2 Boulevard de la Lironde, F-34398 Montpellier Cedex 5, France
Isabelle Gounand
Affiliation:
Université Montpellier II, CNRS, INRA, UMR AMAP: Botanique et Bioinformatique de l'Architecture des Plantes, CIRAD – TA A51/PS2 Boulevard de la Lironde, F-34398 Montpellier Cedex 5, France
Christine Alaux
Affiliation:
Université Montpellier II, CNRS, INRA, UMR AMAP: Botanique et Bioinformatique de l'Architecture des Plantes, CIRAD – TA A51/PS2 Boulevard de la Lironde, F-34398 Montpellier Cedex 5, France
Emmanuelle Jousselin
Affiliation:
INRA, UMR CBGP, Campus International de Baillarguet, CS 30016, 34988 Montferrier-sur-Lez, France
Daniel Barthélémy
Affiliation:
Université Montpellier II, CNRS, INRA, UMR AMAP: Botanique et Bioinformatique de l'Architecture des Plantes, CIRAD – TA A51/PS2 Boulevard de la Lironde, F-34398 Montpellier Cedex 5, France
Laurence Gaume
Affiliation:
Université Montpellier II, CNRS, INRA, UMR AMAP: Botanique et Bioinformatique de l'Architecture des Plantes, CIRAD – TA A51/PS2 Boulevard de la Lironde, F-34398 Montpellier Cedex 5, France
*
*Corresponding author. Email: Vincent.Bonhomme@cirad.fr
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Abstract:

The Bornean climber, Nepenthes bicalcarata, is unique among plants because it is both carnivorous and myrmecophytic, bearing pitcher-shaped leaves and the ant Camponotus schmitzi within tendrils. We explored, in the peat swamp forests of Brunei, the hypothesis that these ants contribute to plant nutrition by catching and digesting its prey. We first tested whether ants increased plant's capture rate. We found that unlike most plant-ants, C. schmitzi do not exhibit dissuasive leaf-patrolling behaviour (zero patrol on 67 pitchers of 10 plants) but lie concealed under pitcher rim (13 ± 6 ants per pitcher) allowing numerous insect visits. However, 47 out of 50 individuals of the largest visitor dropped into the pitchers of five plants were attacked by ants and the capture rate of the same pitchers deprived of their ambush hunting ants decreased three-fold. We then tested whether ants participated in plant's digestion. We showed in a 15-d long experiment that ants fed on prey and returned it in pieces in seven out of eight pitchers. The 40 prey deposited in ant-deprived pitchers remained intact indicating a weak digestive power of the fluid confirmed to be only weakly acidic (pH ~5, n = 67). The analysis of 10 pitcher contents revealed that prey, mainly ants and termites, was very numerous (~400 per pitcher per plant) and highly fragmented. Altogether, these data suggest a positive effect of C. schmitzi on both prey intake and breakdown. This ant–plant interaction could thus be a nutritional mutualism involving the unusual association of carnivory and myrmecotrophy.

Keywords

Ant-plant mutualismmyrmecophytemyrmecotrophypitcher plantpredation strategy

Information

Type
Research Article
Information
Journal of Tropical Ecology , Volume 27 , Issue 1 , January 2011 , pp. 15 - 24
Copyright
Copyright © Cambridge University Press 2010

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