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Dynamics of the association between a long-lived understory myrmecophyte and its speciWc associated ants

Orivel, Jérôme and Lambs, Luc and Malé, Pierre-Jean G. and Leroy, Céline and Grangier, Julien and Otto, Thierry and Quilichini, Angélique and Dejean, Alain Dynamics of the association between a long-lived understory myrmecophyte and its speciWc associated ants. (2010) Oecologia, vol.164 . ISSN 0029-8549

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Official URL: http://dx.doi.org/10.1007/s00442-010-1739-5

Abstract

Myrmecophytic symbioses are widespread in tropical ecosystems and their diversity makes them useful tools for understanding the origin and evolution of mutualisms.Obligate ant–plants, or myrmecophytes, provide a nesting place, and, often, food to a limited number of plant–ant species. In exchange, plant–ants protect their host plants from herbivores, competitors and pathogens, and can provide them with nutrients. Although most studies to date have highlighted a similar global pattern of interactions in these systems, little is known about the temporal structuring and dynamics of most of these associations.In this study we focused on the association between the understory myrmecophyte Hirtella physophora (Chrysobalanaceae)and its obligate ant partner Allomerus decemarticulatus(Myrmicinae). An examination of the life histories and growth rates of both partners demonstrated that this plant species has a much longer lifespan (up to about 350 years) than its associated ant colonies (up to about 21 years). The size of the ant colonies and their reproductive success were strongly limited by the available nesting space provided by the host plants. Moreover, the resident ants positively aVected the vegetative growth of their host plant, but had a negative eVect on its reproduction by reducing the number of Xowers and fruits by more than 50%. Altogether our results are important to understanding the evolutionary dynamics of ant–plant symbioses. The highly specialized interaction between long-lived plants and ants with a shorter lifespan produces an asymmetry in the evolutionary rates of the interaction which, in return, can aVect the degree to which the interests of the two partners converge.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre de Coopération Internationale en Recherche Agronomique - CIRAD
French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Institut National de la Recherche Agronomique - INRA
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By:Florence Amor

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