Hoarding patterns of sigmodontine rodent species in the Central Monte Desert (Argentina)
Article first published online: 1 AUG 2012
© 2012 The Authors. Austral Ecology © 2012 Ecological Society of Australia
Volume 38, Issue 5, pages 485–492, August 2013
How to Cite
GIANNONI, S. M., CAMPOS, V. E., ANDINO, N., RAMOS-CASTILLA, M., OROFINO, A., BORGHI, C. E., DE LOS RÍOS, C. and CAMPOS, C. M. (2013), Hoarding patterns of sigmodontine rodent species in the Central Monte Desert (Argentina). Austral Ecology, 38: 485–492. doi: 10.1111/j.1442-9993.2012.02438.x
- Issue published online: 11 JUL 2013
- Article first published online: 1 AUG 2012
- Accepted for publication July 2012.
- Prosopis flexuosa;
Hoarding food is an important strategy of rodents in desert environments characterized by unpredictable and poor food resource availability. In the Monte Desert, Prosopis produces abundant food, unevenly in time and space, in the form of pods and seeds. Sigmodontine rodents (Graomys griseoflavus, Akodon molinae, Eligmodontia typus and Calomys musculinus) use Prosopis propagules extensively, and they could be predators or dispersers depending on how they handle and where they leave the propagules. The objectives of this study were: (1) to know what rodent species transported propagules; (2) to evaluate what hoarding pattern was used by species that transport propagules (larder and scatterhoarding); and (3) to analyse in which condition were propagules left by the rodent species, both at the food source and in caches. Our results showed that all four species transported propagules, with G. griseoflavus and E. typus being the species that carried more seeds. Our study supported the evidence that food caching is common among species and that many species both larderhoard and scatterhoard food. Graomys griseoflavus and A. molinae, the largest species, larderhoarded more than did the smaller E. typus. These results uphold the hypothesis that larger species will show greater propensity to larderhoard than smaller species. Considering the interaction between seed-hoarding patterns and plants, E. typus was the species that could most improve germination because it scatterhoarded propagules and left seeds out of pods. In contrast, G. griseoflavus could have a negative impact on plant populations because this was the species that predated more seeds and larderhoarded a high percentage of them. The smallest C. musculinus was the species that transported propagules least, and left them as seeds inside pods or pod segments mainly at the food source, which makes seeds more vulnerable to predation.