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Spatial and temporal variation in wild pollination service in the Mongolian steppe.

机译：蒙古草原野生授粉服务的时空变化

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摘要

Despite the importance of wild pollination as an ecosystem service, little is known about the spatial and temporal variation of pollination services. Variation in insect pollinator emergence or forb flowers can lead to inconsistent delivery of pollination service to the forb community. A variety of factors, such as air temperature, flower abundance, pollinator abundance, and forb species richness influence the stability of pollination service. All of these factors exhibit spatial and temporal variability. Furthermore, anthropogenic disturbances endanger the persistence of pollination service. To assess the variability of pollination we compared the number of insect flower visits at different locations throughout the summer for two consecutive years in Dalbay Valley, Mongolia. Within this spatio-temporal framework, we investigated the stability of plant-pollinator networks and the effect of ungulate grazing cessation on pollinator visits.;Flower visits, forb flower abundance, and measures of plant-pollinator network stability varied greatly over space and time. Hymenoptera visits were positively correlated with only network specialization and Diptera visits were positively correlated with only network nestedness. The exclusion of ungulate grazing altered the composition and abundance of both the forb species and flower visitor communities, but there was no difference in total flower visits between grazed and ungrazed plots. Our results suggest the forb and pollinator community may persist despite the removal of the consistent ungulate grazing pressure. Furthermore, the contribution towards network stability may not be synergistic. Hymenoptera visits were associated with increased network specialization, which tends to lower plant-pollinator network resilience against perturbations, while Diptera visits were associated with increased nestedness, which tends to increase network resilience.
机译：尽管野生授粉作为一种生态系统服务很重要，但对授粉服务的时空变化知之甚少。昆虫传粉媒介出现或传粉花朵的变化可能导致向传粉社区提供的传粉服务不一致。多种因素（例如气温，花的丰度，传粉媒介的丰度和前传物种的丰富度）影响授粉服务的稳定性。所有这些因素都表现出时空变异性。此外，人为干扰扰乱了授粉服务的持续性。为了评估授粉的变异性，我们比较了整个夏季连续两年在蒙古Dalbay Valley进行的不同地点的昆虫花访次数。在这种时空框架内，我们研究了植物-授粉媒介网络的稳定性以及有蹄类动物放牧对传粉媒介访视的影响。;花访视，禁忌花的丰度以及植物-授粉媒介网络稳定性的测度随时间和空间变化很大。膜翅目造访与仅网络专业化呈正相关，双翅目造访与仅网络嵌套呈正相关。排除有蹄类动物放牧会改变福布斯树种和访花者群落的组成和丰度，但放牧和未浸染地块的总访花次数没有差异。我们的结果表明，尽管消除了一致的有蹄类动物放牧压力，但福布和授粉媒介仍可能持续存在。此外，对网络稳定性的贡献可能不是协同的。膜翅目造访与网络专业化程度的提高有关，这往往会降低植物-授粉媒介对摄动的网络弹性，而双翅目造访与嵌套度的增加有关，这往往会提高网络的弹性。

著录项

  • 作者

    Song, Daniel Sung.;

  • 作者单位

    University of Pennsylvania.;

  • 授予单位 University of Pennsylvania.;
  • 学科 Ecology.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 153 p.
  • 总页数 153
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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