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Climate change and range expansion of an aggressive bark beetle

evidence of higher beetle reproduction in naıve host tree populations

Cudmore, Timothy J. and Björklund, Niklas and Carroll, Allan L and Lindgren, Staffan (2010). Climate change and range expansion of an aggressive bark beetle. Journal of applied ecology. 47 , 1036-1043
[Research article]

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Official URL: http://dx.doi.org/10.1111/j.1365-2664.2010.01848.x


1. Hosts may evolve defences that make them less susceptible and suitable to herbivores impacting
their fitness. Due to climate change-driven range expansion, herbivores are encountering naı¨ve host
populations with increasing frequency.
2. Aggressive bark beetles are among the most important agents of disturbance in coniferous forest
ecosystems. The presence of bark beetle outbreaks in areas with a historically unsuitable climate, in
part a consequence of climate change, provided an opportunity to assess the hypothesis that the
mountain pine beetle Dendroctonus ponderosae has higher reproductive success in lodgepole pine
Pinus contorta trees growing in areas that have not previously experienced frequent outbreaks.
3. We felled and sampled mountain pine beetle-killed trees from historically climatically suitable
and unsuitable areas, i.e. areas with and without a historical probability of frequent outbreaks.
Reproductive success was determined from a total of 166 trees from14 stands.
4. Brood productivity was significantly affected by climatic suitability class, such that mean brood
production per female increased as historical climatic suitability decreased.
5. Synthesis and applications. The current study demonstrates that the mountain pine beetle has
higher reproductive success in areas where its host trees have not experienced frequent beetle epidemics,
which includes much of the current outbreak area in north central British Columbia. This
increased productivity of mountain pine beetle is likely to have been a key reason for the rapid population
buildup that resulted in unprecedented host tree mortality over huge areas in western
Canada. The outbreak thus provides an example of how climate change-driven range expansion of
native forest insects can have potentially disastrous consequences. Since an increased reproductive
success is likely to accelerate the progression of outbreaks, it is particularly critical to manage forests
for the maintenance of a mosaic of species and age classes at the landscape level in areas where host
tree populations are naı¨ve to eruptive herbivores.

Authors/Creators:Cudmore, Timothy J. and Björklund, Niklas and Carroll, Allan L and Lindgren, Staffan
Title:Climate change and range expansion of an aggressive bark beetle
Subtitle:evidence of higher beetle reproduction in naıve host tree populations
Series Name/Journal:Journal of applied ecology
Year of publishing :2010
Page range:1036-1043
Publisher:British Ecological Society
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Forest
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:K Forestry > K01 Forestry - General aspects
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Obsolete subject words > NATURAL SCIENCES > Biology > Terrestrial, freshwater and marine ecology > Terrestrial ecology
Keywords:climate change, climatic suitability class, co-evolution, lodgepole pine, mountain pine beetle, range expansion, reproductive success, selection pressure, suitability, susceptibility
Permanent URL:
Additional ID:
Type of IDID
ID Code:9209
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: Niklas Björklund
Deposited On:20 Nov 2012 11:43
Metadata Last Modified:02 Dec 2014 10:53

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