Discrimination among host tree species by the ambrosia beetle Platypus quercivorus |
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Authors: | Michimasa Yamasaki Kazuyoshi Futai |
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Institution: | (1) Laboratory of Forest Biology, Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan;(2) Laboratory of Environmental Mycoscience, Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan |
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Abstract: | The ambrosia beetle Platypus quercivorus is a vector for the fungus that causes Japanese oak wilt, and susceptibility to infestation by P. quercivorus varies by tree species. We postulated that P. quercivorus discriminates among host tree species differing in susceptibility to attack. To test this postulate, we counted the number
of flying male beetles (NFM), the number of holes bored by male beetles (NH), and the number of flying female beetles (NFF)
per unit area of bark surface in three fagaceous tree species: Quercus crispula (with high susceptibility to infestation) and Q. serrata and Castanea crenata (both with low susceptibility). NFM and NH were used to calculate the proportion of male beetles that bored holes out of
those that flew to the tree (PBM). We used generalized additive models to predict NFM, NFF, and PBM. The locations of trees,
expressed as x and y coordinates, numbers of weeks after the first male beetle’s flying (WEEK), diameters of trees 130 cm above ground (DBH),
and tree species (SP) were incorporated into the models as candidate explanatory variables. The best-fit models for NFM and
NFF included WEEK and DBH and the effect of location; SP was not included in the models. For PBM, the best-fit model included
WEEK, DBH, and SP. The results indicate that male P. quercivorus prefer Q. crispula to Q. serrata and C. crenata and that selection is made before boring holes on trees, but that P. quercivorus do not discriminate among host species when they fly to trees. |
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