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Title: Deer overbrowsing on autumn-flowering plants causes bumblebee decline and impairs pollination service
Authors: Sakata, Yuzu
Yamasaki, Michimasa  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 坂田, ゆず
山﨑, 理正
Keywords: Deer browsing
Floral resources
Indirect effects
Structural equation modeling
Issue Date: 15-Dec-2015
Publisher: Ecological Society of America
Journal title: Ecosphere
Volume: 6
Issue: 12
Thesis number: 274
Abstract: Increased ungulate browsing has altered the composition of plant communities and food webs of forest ecosystems in many regions around the world. To evaluate the cascading impact of deer browsing on pollination and plant reproduction is critical to understand the roles of species interactions in maintaining plant populations and for conservation management. In this study, we investigated the relationships among floral resources of understory herbaceous plants, pollinator visitation, and fruit set of shrub species based on data accumulation over three years in six temperate deciduous forests with deer and without deer.We found that in deer browsed sites, the visitation rate of bumblebees had decreased due to severe reduction in the coverage of autumn-flowering herbaceous plants, while the effect varied between bumblebee species. On the other hand, other insect taxa showed no dependence on variation in autumn floral resources. The two genera of bumblebee-pollinated shrubs showed reduced fruit set due to severe decline in autumn-flowering herbaceous plants and bumblebee visitation (Weigela: -18.5% and Rhododendron: -21.9%). In contrast, the fruit set of shrubs pollinated by insects that did not show dependence on autumn floral resources were not negatively affected by deer browsing. Our results suggest that deer browsing have not only caused negative effects on herbaceous plants, but in addition have negative indirect effects on reproduction of woody plants through cascading effects of pollination linkages.
Rights: © 2015 Sakata and Yamasaki. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI(Published Version): 10.1890/ES15-00401.1
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