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首页> 外文学位 >Placement and recovery of seed caches by a solitary rodent, Ord's kangaroo rat (Dipodomys ordii).
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Placement and recovery of seed caches by a solitary rodent, Ord's kangaroo rat (Dipodomys ordii).

机译：由一只孤独的啮齿动物Ord的袋鼠（Dipodomys ordii）放置和回收种子。

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摘要

Seed caching is a common behavior that has important ecological consequences for seed-hoarding animals, granivorous competitors, and plants whose seeds are harvested and stored. Despite the significance of this behavior, patterns of storage and recovery of caches for many food-hoarding animals in the wild remain poorly understood. For example, many rodents are prolific and dynamic seed hoarders, storing large quantities of seeds in larderhoards (repeated deposits of seeds in a centralized location) and scatterhoards (small, scattered, subsurface caches), yet few factors that influence placement of caches by rodents have been identified. Furthermore, no study has examined seasonal shifts in placement of caches by seed-storing animals that forage throughout the year. Preliminary investigations revealed that Ord's kangaroo rats (Dipodomys ordii) are active year-round in the Sandhill Region of Nebraska and that these rodents deposit seeds of soapweed yucca ( Yucca glauca) in both larderhoards and scatterhoards. This unique situation provided an opportunity to investigate use of burrows, seed-caching patterns, and recovery of caches by a solitary rodent in the wild. Ord's kangaroo rats inhabited burrows alone and typically used multiple burrows in summer, but only 1 burrow in winter. Additionally, individuals took yucca seeds directly to burrows in winter (larderhoarding), but distributed seeds into shallowly buried caches in summer (scatterhoarding). Kangaroo rats likely larderhoarded seeds in winter to have convenient access to resources and because few suitable sites were available to scatterhoard seeds in this season. In summer, kangaroo rats placed caches in a clumped arrangement closer to seed sources than to burrows, following the rapid-sequestering hypothesis. In a test of recovery of caches, kangaroo rats did not have a distinct advantage over pilferers in recovering their own scatterhoards of yucca seeds. Although seed caches were recovered quickly, most caches were only partially recovered. Finally, burrows of Ord's kangaroo rats were simple in structure and contained few seeds in summer; reinforcing the observation that larderhoarding was uncommon in this population in summer. Overall, evidence indicates that Ord's kangaroo rats are flexible seed hoarders as they switch patterns of seed storage and use of burrows seasonally. Furthermore, their storage and incomplete recovery of caches has important implications for dispersal of plants in the Sandhill Region.
机译：种子缓存是一种常见行为，会对种子贮藏动物，食肉竞争者和收获并存储种子的植物产生重要的生态影响。尽管这种行为具有重要意义，但对于许多野外觅食动物的储藏方式和储藏方式的了解仍然很少。例如，许多啮齿动物是多产的动态种子贮藏库，将大量种子存储在储藏室（种子在中央位置重复沉积）和散布库（小的，分散的地下埋藏物），但很少有影响啮齿动物放置藏物的因素已经确定。此外，没有研究检查过全年觅食的种子贮藏动物的储藏位置的季节性变化。初步调查显示，Ord的袋鼠大鼠（Dipodomys ordii）在内布拉斯加州的Sandhill地区全年活跃，这些啮齿动物将草丝兰（Yucca glauca）的种子沉积在长der和散布both中。这种独特的情况提供了一个机会，可以调查洞穴中的使用，种子的捕获方式以及在野外由一只单独的啮齿动物恢复的缓存。奥德（Ord）的袋鼠大鼠仅栖息于洞穴中，夏季通常使用多个洞穴，而冬季仅使用1个洞穴。另外，人们在冬天将丝兰种子直接带到洞穴（贮藏），而在夏天将种子分配到浅埋的藏匿处（撒散）。袋鼠大鼠很可能在冬天将贮藏的种子取到了方便的资源，因为在这个季节很少有合适的地点可以撒散散落的种子。在夏天，根据快速成因的假说，袋鼠大鼠以成簇的方式将缓存放置成更靠近种子源而不是洞穴。在恢复藏匿处的测试中，袋鼠大鼠在恢复自己的丝兰种子散布场方面没有比盗窃者明显的优势。尽管可以快速恢复种子缓存，但是大多数缓存仅被部分恢复。最后，Ord的袋鼠大鼠的洞穴结构简单，夏季种子很少。加强了这样的观察，即在这个人群中，夏季很少有人进行ho积活动。总体而言，有证据表明，Ord的袋鼠大鼠是灵活的种子ho积者，因为它们会季节性改变种子存储和穴居利用的方式。此外，它们的存储和缓存的不完全恢复对于在Sandhill地区分散植物具有重要意义。

著录项

  • 作者

    White, Jeremy Andrew.;

  • 作者单位

    Auburn University.;

  • 授予单位 Auburn University.;
  • 学科 Biology Ecology.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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