Deceased 7 March 2008.
Invasive Ants Disrupt Gecko Pollination and Seed Dispersal of the Endangered Plant Roussea simplex in Mauritius
Article first published online: 31 OCT 2008
© 2009 The Author(s) Journal compilation © 2009 by The Association for Tropical Biology and Conservation
Volume 41, Issue 2, pages 202–208, March 2009
How to Cite
Hansen, D. M. and Müller, C. B. (2009), Invasive Ants Disrupt Gecko Pollination and Seed Dispersal of the Endangered Plant Roussea simplex in Mauritius. Biotropica, 41: 202–208. doi: 10.1111/j.1744-7429.2008.00473.x
- Issue published online: 27 FEB 2009
- Article first published online: 31 OCT 2008
- Received 2 May 2008; revision accepted 23 August 2008.
- Indian Ocean;
- introduced species;
- Phelsuma cepediana;
- plant–animal interactions;
- Technomyrmex albipes
In Mauritius, the endemic blue-tailed day-gecko Phelsuma cepediana is currently the sole pollinator and seed disperser of the critically endangered endemic plant Roussea simplex (Rousseaceae). The flowers and fruits are often visited by the invasive ant Technomyrmex albipes, which forages on the nectar and fruit pulp, and tends honeydew-producing mealybugs on the fruits. Here, we experimentally explore how the presence of this alien ant species influences geckos foraging at flowers and fruits of R. simplex by removing and excluding ants from flowers and fruits. Gecko visitation rates to ant-free control flowers and fruits, and flowers and fruits where ants had been removed and excluded, were higher than those to ant-infested flowers and fruits. The resulting seed set of ant-infested flowers was greatly reduced, compared to ant-free control flowers. Similarly, for fruits with ants, very few seeds were likely to be ingested and dispersed by the geckos. Thus, T. albipes monopolizes flowers and fruits of R. simplex, and prevents access of pollinating and seed-dispersing P. cepediana geckos by aggressive interference competition. For a critically endangered plant like R. simplex, this double-disruption of two vital mutualistic interactions is of urgent conservation concern.