A dynamic host selection model for mountain pine beetle,Dendroctonus ponderosae Hopkins |
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| Authors: | Alex M Chubaty Bernard D Roitberg Chao Li |
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| Institution: | 1. Department Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada;2. Canadian Forest Service, Northern Forestry Centre, 5320 - 122 Street, Edmonton, AB T6H 3S5, Canada;1. Biologie I, University of Regensburg, Universitätsstraße 31, D-93040 Regensburg, Germany;2. Institute of Functional Genomics, University of Regensburg, Josef-Engert-Str. 9, D-93051 Regensburg, Germany;1. Balochistan Agricultural Research Centre, Brewery Road, Western Bypass, Quetta, Pakistan;2. Institute of Agriculture and Environment, Massey University, Private Bag 11222, Palmerston North, New Zealand;3. Pakistan Agricultural Research Council, Plot No. 20, G-5/1, Islamabad, Pakistan;1. Departamento de Ecologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, CEP 21941-590, RJ, Brazil;2. University of York, Department of Biology, Heslington, York YO10 5DD, United Kingdom;3. Embrapa Meio Ambiente, CEP 13120-000, Jaguariúna, SP, Brazil;1. Department of Botany, Faculty of Science, University of South Bohemia, Brani?ovská 31, CZ-370 05 ?eské Budějovice, Czech Republic;2. Institute of Botany, Academy of Sciences of the Czech Republic, Dukelská 143, CZ-37982 T?eboň, Czech Republic;3. Institute of Botany, Academy of Sciences of the Czech Republic, CZ-252 43 Pr?honice, Czech Republic;4. Department of Ecology, Faculty of Science, Charles University in Prague, Vini?ná 7, CZ-128 44 Prague, Czech Republic |
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| Abstract: | The link between individual habitat selection decisions (i.e., mechanism) and the resulting population distributions of dispersing organisms (i.e., outcome) has been little-studied in behavioural ecology. Here we consider density-dependent habitat (i.e., host) selection for an energy- and time-limited forager: the mountain pine beetle (Dendroctonus ponderosae Hopkins). We present a dynamic state variable model of individual beetle host selection behaviour, based on an individual’s energy state. Field data are incorporated into model parameterization which allows us to determine the effects of host availability (with respect to host size, quality, and vigour) on individuals’ decisions. Beetles choose larger trees with thicker phloem across a larger proportion of the state-space than smaller trees with thinner phloem, but accept lower quality trees more readily at low energy- and time-states. In addition, beetles make habitat selection decisions based on host availability, conspecific attack densities, and beetle distributions within a forest stand. This model provides a framework for the development of a spatial game model to examine the implications of these results for attack dynamics of beetle populations. |
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