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Simulated warming effects on plant-insect interactions in a cold temperate region

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Title: Simulated warming effects on plant-insect interactions in a cold temperate region
Authors: Nakamura, Masahiro Browse this author
Issue Date: 31-Oct-2011
Citation: 北方圏の環境研究に関するシンポジウム. 2011年10月31日(月). 北海道大学学術交流会館 小講堂. Northern Environmental Research Symposium (Hokkaido-Finland Days: A Bridge for Northern Cooperation). Monday, 31 October, 2011. Hokkaido University Conference Hall.
Abstract: Temperature increases of global warming are predicted to be greater at higher latitudes and impact virtually all chemical and biological processes. Ecosystem responses to global warming will be complex and varied in time and space due to direct and indirect effects of them. Field ecological manipulations of global warming are conducted to determine response of whole terrestrial ecosystems to an environmental variable in a manner that mimics climate change. Recently, ecologists from around the world have begun filed manipulations of global warming. Most studies have focused on effects of experimental warming on soil respiration, net N mineralization, and aboveground productivity of understory plants. In contrast, the trophic interactions in changing climate conditions are poorly known. Researches on warming experiments focused initially on the responses of plants and, to a much lesser extent, on those of a second trophic group. Temperature is identified as the dominant abiotic factor affecting insect herbivores. In forests, most biological activities and species diversity are concentrated in the canopy, rather than in the understory. To understand how soil and branch warming affect herbivory via changes in leaf traits on canopy trees of Quercus crispula (18-20 m in height), we measured leaf traits (e.g. LMA, nitrogen, and total phenolics) and herbivory using a canopy crane. The branch warming did not affect herbivory of canopy foliage. However, the soil warming decreased herbivory of canopy foliage. The soil warming altered canopy leaf traits; nitrogen content and lignin decreased but total phenolics and condensed tannin increased. The decrease in herbivory can be explained by cellulose, total phenolics, and lignin in canopy foliage. These results suggested that plastic response of canopy leaf traits to the soil warming may decrease abundance of insect herbivores in forests. This is contrary to what would generally be expected according to mathematical modeling and laboratory investigations considering about direct effects of global warming on insect herbivores.
Description: Session 2.1: Biodiversity and Environmental Protection in the North
Conference Name: Northern Environmental Research Symposium
Conference Place: Sapporo
Type: conference presentation
Appears in Collections:北海道大学サステナビリティ・ウィーク2011 (Sustainability Weeks 2011) > 北方圏の環境研究に関するシンポジウム (Northern Environmental Research Symposium : Hokkaido-Finland Days: A Bridge for Northern Cooperation)

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