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The effect of temperature on trophic interactions

implications for the population dynamics of a forest pest insect in a warmer climate

Kollberg, Ida (2013). The effect of temperature on trophic interactions. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2013:57
ISBN 978-91-576-7852-2
eISBN 978-91-576-7853-9
[Doctoral thesis]

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Increase in temperature related to climate change will have consequences on the performance of organisms. Insects could be expected to respond more than other organism groups because they are ectotherms. Many herbivorous insects are considered pests and may cause severe damage, therefore, trying to predict the performance of pest insects in a future climate is vital. In order to make predictions about the future we need to better understand the mechanisms and processes that are driving the population dynamics of pest insects. To achieve that all the life stages and the interactions with other trophic levels, such as host plants and natural enemies need to be considered. The European pine sawfly, Neodiprion sertifer Geoffr. (Hymenoptera: Diprionidae), is a pest species in boreal pine (Pinus spp.) forests. Its populations undergo large fluctuations in densities that may reach very high levels, so called outbreaks. In this thesis the effect of temperature on interactions known to be important for the sawfly population dynamics is evaluated to assess if the risk of outbreaks will increase due to climate warming. Sawfly performance was studied with respect to stage specific mortality factors; i.e. secondary compounds in the food (diterpenes), arthropod predation of the larvae and small mammal predation on the pupae. Climate chambers were used to create different temperatures in the laboratory and in a field study a latitudinal gradient was utilized. The results indicate that survival in the larval stage may decrease but survival in the pupal stage may increase with increasing temperature. The relative importance of the different mortality factors was investigated in a simple population model and the outcome suggests that in warmer temperatures, increased larval mortality outweighs the effects of decreased pupal mortality, which imply that the propensity for sawfly outbreaks to occur will be reduced in a warmer future climate.

Authors/Creators:Kollberg, Ida
Title:The effect of temperature on trophic interactions
Subtitle:implications for the population dynamics of a forest pest insect in a warmer climate
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2013
Number of Pages:52
I.Kollberg, I., Bylund, H., Schmidt, A., Gershenzon, J. and Björkman, C. (2013). Multiple effects of temperature, photoperiod and food quality on the performance of a pine sawfly. Ecological Entomology 38, 201-208
II.Kollberg, I., Bylund, H., Schmidt, A., Gershenzon, J. and Björkman, C. Larval survival of a pine sawfly in relation to temperature - the relative role of bottom-up and top-down processes along a latitudinal gradient. (manuscript)
III.Kollberg, I., Bylund, H., Laugen, A. and Björkman, C. Effect of increased temperature on larval development and growth in two geographically separated populations of a forest pest insect (Neodiprion sertifer):local adaptation and outbreak risk. (manuscript)
IV.Kollberg, I., Bylund, H., Huitu, O. and Björkman, C. Small mammal predation on a forest pest insect: enhanced outbreak risks in a warming climate? (manuscript)
V.Kollberg, I., Björkman, C. and Bylund, H. Regulation of herbivorous insect populations in a warmer climate: contrasting the role of different mortality factors. (manuscript)
Place of Publication:Uppsala
Publisher:Department of Ecology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7852-2
ISBN for electronic version:978-91-576-7853-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F40 Plant ecology
H Protection of plants and stored products > H10 Pests of plants
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Agrovoc terms:pest insects, neodiprion sertifer, forest pests, pinus, herbivory, population dynamics, trophic levels, climatic change, temperature, plant animal relations, mortality, natural enemies, diterpenoids
Keywords:trophic interactions, population dynamics, temperature, climate change, herbivore, mortality, natural enemies, outbreak, phytophagous insect, plant-insect interactions, diterpenoid resin acids
Permanent URL:
ID Code:10747
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
External funders:FORMAS
Deposited By: Ida Kollberg
Deposited On:16 Aug 2013 11:13
Metadata Last Modified:02 Dec 2014 11:02

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