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Experimental warming increased insect herbivory in an alpine dryas heath at Finse, Norway

Bergmann, Saskia
Master thesis
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URI
http://hdl.handle.net/11250/187027
Date
2013-09-23
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  • Master's theses (INA) [593]
Abstract
Alpine ecosystems are particularly expected to experience changes due to temperature

rise, but little is known how insect herbivory may respond to that process.

I used two already established study sites at different elevations with control plots and

Open Top Chambers (OTCs) in a Dryas octopetala heath in the alpine ecosystem of Finse,

southwestern Norway, to investigate whether experimental warming does affect insect

herbivory. Leaf feeding damage was recorded in early and late summer and number of

insect herbivores counted by searching the plots; pitfall traps were used to map other

potential insect herbivores in the area. General Linear Models (GLMs) were used to

examine the effects.

Experimental warming increased the total amount of insect herbivory, mainly due to

plant species Dryas octopetala and Bistorta vivipara. Most insect herbivores were

Lepidoptera and Zygaena exulans was the most abundant species. Larvae of Z. exulans

were found in higher number inside as compared to outside the OTCs. The pitfall traps

indicated other potential insect herbivores.

This study suggests that some plant species such as Dryas octopetala and Bistorta

vivipara, are more susceptible than others to insect herbivores with temperature rise.

Concluding that insect herbivory may have important impact on species composition

and ecosystem functions.
Publisher
Norwegian University of Life Sciences, Ås

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