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Pilfering of western juniper seed caches by scatter-hoarding rodents varies by microsite and canopy type

Integrative Zoology 2022年第2期17卷 192-205页

作者： lindsay a.dimitri William S.LONGLAND Agricultural Research Service Great Basin Rangeland ResearchUSDAUSA

Scatter-hoarding rodents store seeds throughout their home ranges in superficially buried caches which,unlike seeds larder-hoarded in burrows,are difficult to *** seeds are often pilfered by other scatter-hoarders and either re-cached,eaten or *** seed movements can influence seedling recruitment,because only seeds remaining in caches are likely to *** the importance of scatter-hoarding rodents in the dispersal of western juniper seeds has recently been revealed,the level of pilfering that occurs after initial burial is *** traits,soil moisture,and substrate can influence pilfering processes,but less is known about how pilfering varies among caches placed in open versus canopy microsites,or how cache discovery and removal varies among different canopy-types,tree versus *** compared the removal of artificial caches between open and canopy microsites and between tree and shrub canopies at two sites in northeastern California during late spring and *** also used trail cameras at one site to monitor artificial cache removal,identify potential pilferers,and illuminate microsite use by *** of artificial caches was faster in open microsites at both sites during both seasons,and more caches were removed from shrub than tree *** kangaroo rats were the species observed most on cameras,foraging most often in open microsites,which could explain the observed pilfering *** is the first study to document pilfering of western juniper seeds,providing further evidence of the importance of scatter-hoarding rodent foraging behavior in understanding seedling recruitment processes in juniper woodlands.

关键词： Dipodomys californicus Juniperus Perognathus parvus Peromyscus truei seed caching seed dispersal

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Seed value influences cache pilfering rates by desert rodents

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Integrative Zoology 2019年第1期14卷 75-86页

作者： Stephen B.VANDER WALL lindsay a.dimitri William S.LONGLAND Joseph D.M.WHITE Department of Biology and Program in Ecology Evolution and Conservation BiologyUniversity of NevadaRenoUSA USDA Agricultural Research ServiceRenoNevadaUSA Department of Biological Sciences University of Cape TownCape TownRepublic of South Africa

Some rodents gather and store *** many seeds they gather and how they treat those seeds is largely determined by seed traits such as mass,nutrient content,hardness of the seed coat,presence of secondary compounds,and germination *** their consumption and dispersal of seeds,rodents act as agents of natural selection on seed traits,and those traits influence how rodents *** seeds that are scatter-hoarded by rodents are pilfered,or stolen,by other rodents,and seed traits also likely influence pilfering rates and seed fates of pilfered *** clarify coevolutionary relationships between rodents and the plants that they disperse,one needs to understand the role of seed traits in rodent foraging *** compared how the seeds of 4 species of plants that are dispersed by scatter-hoarding animals and that differ in value(singleleaf piñon pine,Pinus monophylla;desert peach,Prunus andersonii;antelope bitterbrush,Purshia tridentata;Utah juniper,Juniperus osteosperma)were pilfered and recached by *** hundred artificial caches of the 4 seed species(25 per species)were prepared,and removal by rodents was *** pilfered high-value seeds more rapidly than the other *** peach seeds,which contain toxic secondary compounds,were more frequently *** low value seeds like Utah juniper and antelope bitterbrush were pil-fered more slowly and were sometimes left at cache sites,and seeds of the latter species were transported shorter distances to new cache *** background density of seeds also appeared to influence the relative value of seeds.

关键词： desert rodents food storage granivory pilfering scatter-hoarding seed dispersal seed traits

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