Abstract
Plants with extrafloral nectaries attract a variety of ant species, in associations commonly considered mutualistic. However, the results of such interactions can be context dependent. Turnera subulata is a shrub widely distributed among disturbed areas which has extrafloral nectaries at the base of leaves. Here, we evaluated whether the ants associated with T. subulata (i) vary in space and/or time; (ii) respond to simulated herbivory, and (iii) reduce herbivory rates. For this, we quantified the abundance and species richness of ants associated with T. subulata throughout the day in six different sites and the defensive capability of these ants under simulated herbivory in the leaves and stems of T. subulata plants (N = 60). We also checked the proportion of the lost leaf area and quantified leaf damage by chewing herbivores in the host plant. We found that a total of 21 ant species associated with the host plant. Species composition showed significant variation across the sampled sites and throughout the day. Visitation rates and predation by ants were higher in plant stems than in leaves. In general, herbivory rates were not correlated with ant association or activity, with the exception of the proportion of leaf area consumed; there was a significant lower herbivory rate on plants in which ants defended the leaves. Our results suggest that the benefits of association may depend on the ecological context. This context dependence may mask the correlation between the defense of ants and herbivory rates.
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Acknowledgements
The authors thank the colleagues of the Clínica Fitossanitária (UFS) for their help in the field, and the two anonymous referees for their valuable contributions. CNPq funded this research granting aid to LB and APAA (PQ 306923/2012-2 and 484823/2013-2, respectively). PFC received a postdoctoral scholarship (CNPq/FAPITEC-SE 302 246/2014-2). NGC and CSA received master’s scholarships (CAPES).
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Cruz, N.G., Cristaldo, P.F., Bacci, L. et al. Variation in the composition and activity of ants on defense of host plant Turnera subulata (Turneraceae): strong response to simulated herbivore attacks and to herbivore’s baits. Arthropod-Plant Interactions 12, 113–121 (2018). https://doi.org/10.1007/s11829-017-9559-8
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DOI: https://doi.org/10.1007/s11829-017-9559-8