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Permanent link (DOI): https://doi.org/10.7939/R3Z892K05

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Trees Wanted - dead or alive! Host selection and population dynamics in tree-killing bark beetles Open Access

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Author or creator
Kausrud, K. L.
Gregoire, J. C.
Skarpaas, O.
Erbilgin, N.
Gilbert, M.
Okland, B.
Stenseth, N. C.
Additional contributors
Subject/Keyword
IPS-typographus coleoptera
Aggregation pheromone
Curculionidae
Attraction
Scolytidae
Cut trees
Mountain pine-beetle
Spruce
Reproductive success
Intraspecific competition
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Abstract: Bark beetles (Coleoptera: Curculionidae, Scolytinae) feed and breed in dead or severely weakened host trees. When their population densities are high, some species aggregate on healthy host trees so that their defences may be exhausted and the inner bark successfully colonized, killing the tree in the process. Here we investigate under what conditions participating with unrelated conspecifics in risky mass attacks on living trees is an adaptive strategy, and what this can tell us about bark beetle outbreak dynamics. We find that the outcome of individual host selection may deviate from the ideal free distribution in a way that facilitates the emergence of tree-killing (aggressive) behavior, and that any heritability on traits governing aggressiveness seems likely to exist in a state of flux or cycles consistent with variability observed in natural populations. This may have implications for how economically and ecologically important species respond to environmental changes in climate and landscape (forest) structure. The population dynamics emerging from individual behavior are complex, capable of switching between \"endemic\" and \"epidemic\" regimes spontaneously or following changes in host availability or resistance. Model predictions are compared to empirical observations, and we identify some factors determining the occurrence and self-limitation of epidemics.
Date created
2011
DOI
doi:10.7939/R3Z892K05
License information
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This work is made available under the terms of the Creative Commons Attribution 2.5 Generic license, http://creativecommons.org/licenses/by/2.5/.
Citation for previous publication
Kausrud K. L., Gregoire, J. C., Skarpaas, O., Erbilgin, N., Gilbert, M., Okland, B., and Stenseth, N. C. (2011). Trees Wanted - dead or alive! Host selection and population dynamics in tree-killing bark beetles. PLoS ONE, 6(5), e18274. DOI: 10.1371/journal.pone.0018274.
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