Data from: Fruit size determines the role of three scatter-hoarding rodents as dispersers or seed predators of a fleshy-fruited Atacama Desert shrub
Squeo, Francisco, A.
Luna, Claudia A., University of La Serena
Loayza, Andrea P., University of La Serena
Squeo, Francisco A., University of La Serena
Published Nov 09, 2017 on Dryad.
Cite this dataset
Loayza, Andrea et al. (2017). Data from: Fruit size determines the role of three scatter-hoarding rodents as dispersers or seed predators of a fleshy-fruited Atacama Desert shrub [Dataset]. Dryad. https://doi.org/10.5061/dryad.13pb4
Scatter-hoarding rodents can act as both predators and dispersers for many large-seeded plants because they cache seeds for future use, but occasionally forget them in sites with high survival and establishment probabilities. The most important fruit or seed trait influencing rodent foraging behavior is seed size; rodents prefer large seeds because they have higher nutritional content, but this preference can be counterbalanced by the higher costs of handling larger seeds. We designed a cafeteria experiment to assess whether fruit and seed size of Myrcianthes coquimbensis, an endangered desert shrub, influence the decision-making process during foraging by three species of scatter-hoarding rodents differing in body size: Abrothrix olivaceus, Phyllotis darwini and Octodon degus. We found that the size of fruits and seeds influenced foraging behavior in the three rodent species; the probability of a fruit being harvested and hoarded was higher for larger fruits than for smaller ones. Patterns of fruit size preference were not affected by rodent size; all species were able to hoard fruits within the entire range of sizes offered. Finally, fruit and seed size had no effect on the probability of seed predation, rodents typically ate only the fleshy pulp of the fruits offered and discarded whole, intact seeds. In conclusion, our results reveal that larger M. coquimbensis fruits have higher probabilities of being harvested, and ultimately of its seeds being hoarded and dispersed by scatter-hoarding rodents. As this plant has no other dispersers, rodents play an important role in its recruitment dynamics.
Data on fruit sizes and selection by rodents
This datafile contains data on 30 experimental trials, 10 per each of three species of rodents (Octodon degus, Phyllotis darwini and Abrothrix olivaceus) in which individuals were offered Myrcianthes coquimbensis fruits of different sizes (n=30). The data shows the fate of each fruit and seed (e.g., ignored, hoarded, predated) in each of the trials.
National Science Foundation, Award: FONDECYT 11140400, ULS-PT 14122, IEB P05-002