02089nas a2200265 4500008004100000245009200041210006900133300001400202490000700216520127700223653002001500653002001520653002801540653002401568653002201592653002601614653002101640653001901661653002001680100001501700700002001715700001701735700001901752856005201771 2009 eng d00aScatter Hoarding by the Central-American Agouti: A Test of Optimal Cache Spacing Theory0 aScatter Hoarding by the CentralAmerican Agouti A Test of Optimal a1327-13330 v783 a

Optimal cache spacing theory predicts that scatter-hoarding animals store food at a density that balances the gains of reducing cache robbery against the costs of spacing out caches further. We tested the key prediction that cache robbery and cache spacing increase with the economic value of food: the ratio of food to consumer abundance. We quantified cache pilferage and cache spacing by the Central American agouti, Dasyprocta punctata, in the tropical forest of Barro Colorado Island, Panama, across 10 1 ha plots that encompassed a more than100-fold range in the availability of Astrocaryum palm seeds, the agouti's principal food. We found that caches were pilfered at higher rates in plots with lower seed availability, and that agoutis cached seeds further away and into lower densities where seed availability was lower. Food scarcity apparently increased the pressure of food competitors on caches, stimulating agoutis to put more effort into caching seeds to create lower cache densities, fully consistent with theory. We conclude that the optimal cache density depends not only on the nutritional value of food but also on the economic value, which may vary in space as well as time.

10acache pilferage10acamera trapping10aCentral American agouti10aDasyprocta punctata10afood availability10aoptimal cache spacing10ascatter hoarding10aSeed dispersal10atropical forest1 aGalvez, D.1 aKranstauber, G.1 aKays, R., W.1 aJansen, P., A. uhttp://dx.doi.org/10.1016/j.anbehav.2009.08.015