Geometrid Moth Outbreaks and their Climatic Relations in Northern Sweden
作者： Amanda B. Young , David M. Cairns , Charles W. Lafon , Jon Moen
DOI: 10.1657/1938-4246-46.3.659
关键词: Operophtera 、 Epirrita 、 Winter moth 、 Geography 、 Deciduous 、 Historical record 、 Ecology 、 Outbreak 、 Autumnal moth 、 Betula pubescens
摘要: Abstract The alpine treeline in northern Fennoscandia is composed primarily of mountain birch (Betula pubescens ssp. czerepanovii), a deciduous tree that experiences episodic defoliation due to outbreaks the autumnal moth (Epirrita autumnata) and winter (Operophtera brumata). Here, we use an extensive dendroecological data set reconstruct historic defoliating relate them climatic conditions. Our are from 25 sites eight valleys Sweden. We used computer program OUTBREAK outbreaks. reconstructed outbreak record matches historical well. There significant, but weak relationship between severity temperatures February, April, July, August year. Temperatures previous May November were also positively correlated with severity. For seasonally aggregated temperatures, only autumn was no significant correlation...
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