Author's personal copy Scatter hoarding by the Central American agouti: a test of optimal cache spacing theory
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چکیده
Scatter hoarding by the Central American agouti: a test of optimal cache spacing theory Dumas Gálvez , Bart Kranstauber , Roland W. Kays , Patrick A. Jansen a,d,e,* Center for Ecological and Evolutionary Studies, University of Groningen Migration and Immuno-ecology, Max Planck Institute for Ornithology, Radolfzell New York State Museum d Smithsonian Tropical Research Institute Centre for Ecosystem Studies, Wageningen University
منابع مشابه
The history of scatter hoarding studies.
In this review, I will present an overview of the development of the field of scatter hoarding studies. Scatter hoarding is a conspicuous behaviour and it has been observed by humans for a long time. Apart from an exceptional experimental study already published in 1720, it started with observational field studies of scatter hoarding birds in the 1940s. Driven by a general interest in birds, se...
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Scatter-hoarding rodents should space food caches to maximize cache recovery rate (to minimize loss to pilferers) relative to the energetic cost of carrying food items greater distances. Optimization models of cache spacing make two predictions. First, spacing of caches should be greater for food items with greater energy content. Second, the mean distance between caches should increase with fo...
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Scatter-hoarding animals spread out cached seeds to reduce density-dependent theft of their food reserves. This behaviour could lead to directed dispersal into areas with lower densities of conspecific trees, where seed and seedling survival are higher, and could profoundly affect the spatial structure of plant communities. We tested this hypothesis with Central American agoutis and Astrocaryum...
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The scatter-hoarding behavior of granivorous rodents plays an important role in seed dispersal and seedling regeneration of trees, as well as the evolution of several well-known mutualisms between trees and rodents in forest ecosystems. Because it is difficult to identify seed hoarders and pilferers under field conditions by traditional methods, the full costs incurred and benefits accrued by s...
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Scatter hoarders are not able to defend their caches. A longer hoarding distance combined with lower cache density can reduce cache losses but increase the costs of hoarding and retrieving. Scatter hoarders arrange their cache density to achieve an optimal balance between hoarding costs and main cache losses. We conducted systematic cache sampling investigations to estimate the effects of food ...
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