Present address: Integrative Biology, University of Texas at Austin, 1 University Station C0930, Austin, TX 78712, USA
Individual-level diet variation in four species of Brazilian frogs
Article first published online: 31 MAR 2009
© 2009 The Authors. Journal compilation © 2009 British Ecological Society
Journal of Animal Ecology
Volume 78, Issue 4, pages 848–856, July 2009
How to Cite
Araújo, M. S., Bolnick, D. I., Martinelli, L. A., Giaretta, A. A. and Dos Reis, S. F. (2009), Individual-level diet variation in four species of Brazilian frogs. Journal of Animal Ecology, 78: 848–856. doi: 10.1111/j.1365-2656.2009.01546.x
- Issue published online: 4 JUN 2009
- Article first published online: 31 MAR 2009
- Received 15 August 2008; accepted 25 February 2009Handling Editor: Ryan Norris
Fig. S1. Interpolation of IS from isotope variances: δ13C variances (Varδ13C) were estimated after the removal of isotope outliers and regressed onto measures of individual specialization (IS) of simulated populations (see text for details). Curves indicate fitted regressions; horizontal dashed lines indicate the empirical Varδ13C. Arrows indicate the empirical IS (emp) from gut contents and the expected IS (exp) interpolated from the empirical Varδ13C of four Brazilian frogs, using the regression equations. A Physalaemus cuvieri (N = 49); B Eupemphix nattereri (N = 44); C Chiasmocleis albopunctata (N = 17); D Elachistocleis bicolor (N = 46).
Table S1. Diet composition of Chiasmocleis albopunctata (N = 50), Elachistocleis bicolor (N = 50), Eupemphix nattereri (N = 37), and Physalaemus cuvieri (N = 50), in the Brazilian Cerrado, represented as the number of prey items consumed and their proportions (in parenthesis) in each species
Table S2. The V measure of individual specialization in the diets of four species of Brazilian frogs (Physalaemus cuvieri, Eupemphix nattereri, Chiasmocleis albopunctata, and Elachistocleis bicolor). Individual specialization was measured using both gut contents and δ13C stable isotopes. Only those individuals for which we had both gut content and isotope data were used. Vemp: empirical V index of individual specialization based on gut-content data; Varδ13C: empirically estimated variances of individual δ13C signatures; Vexp: expected value of the V index based on isotope data (see Methods). Vemp values were tested against null distributions generated with Monte Carlo bootstraps (10 000 simulations); ***P < 0.001. n: sample size
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