Short-term plasticity and variation in acacia ant-rewards under different conditions of ant occupancy and herbivory
- 1 July 2021
- journal article
- research article
- Published by Springer Science and Business Media LLC in The Science of Nature
- Vol. 108 (4), 1-12
- https://doi.org/10.1007/s00114-021-01738-w
Abstract
In ant–plant defense mutualisms, plants known as myrmecophytes provide food and shelter to ant partners in exchange for defense against herbivores and pathogens. To ensure interaction pay-off, myrmecophytes must regulate their investment in ant-rewards depending on local conditions and herbivore pressure. We investigated how myrmecophyte investment in multiple ant-rewards relates to herbivory, ant defense, and ant occupancy over time. Specifically, we examined the plasticity of ant-rewards produced by swollen-thorn acacias (Vachellia collinsii) under different ant occupancy and herbivory conditions. We compared food rewards (number of extrafloral nectaries and pinnules as a proxy for food bodies) and housing rewards (domatia dimensions) of V. collinsii for three conditions: (1) occupied (defended by the obligate mutualist Pseudomyrmex spinicola) versus unoccupied trees, (2) occupied trees subject to an experimental herbivory manipulation versus control trees, and (3) trees occupied by different ant species varying in their level of defense (P. spinicola, P. simulans, Crematogaster crinosa). We found that food rewards were more likely to vary in time depending on ant occupancy and resident species. Conversely, housing rewards varied with the condition (occupancy or species of partner) and less through time. A one-time herbivory manipulation did not cause any changes to the ant-rewards produced. Our results reveal short-term plasticity in V. collinsii ant-rewards and demonstrate that myrmecophytes with constitutive rewards can adjust their investment in ant-rewards depending on the presence and identity of ant partners.Keywords
Funding Information
- Smithsonian Tropical Research Institute (Internship, Internship, Research funds)
This publication has 44 references indexed in Scilit:
- Water Stress Strengthens Mutualism Among Ants, Trees, and Scale InsectsPLoS Biology, 2013
- Increased Host Investment in Extrafloral Nectar (EFN) Improves the Efficiency of a Mutualistic Defensive ServicePLOS ONE, 2012
- Dynamics of the association between a long-lived understory myrmecophyte and its specific associated antsOecologia, 2010
- Divergent investment strategies of Acacia myrmecophytes and the coexistence of mutualists and exploitersProceedings of the National Academy of Sciences of the United States of America, 2009
- CorrigendumInsect Science, 2007
- The origin of herbivory on land: Initial patterns of plant tissue consumption by arthropodsInsect Science, 2007
- Extrafloral nectary phenotypic plasticity is damage- and resource-dependent inVicia fabaBiology Letters, 2006
- Conspicuous extra‐floral nectaries are inducible in Vicia fabaEcology Letters, 2003
- Relaxation of an induced defense after exclusion of herbivores: spines on Acacia drepanolobiumOecologia, 1998
- Code of Ant-Plant Mutualism Broken by ParasiteScience, 1990