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Pre- and post-dispersal damage to the nuts of two beech species (Fagus crenata blume andF. japonica Maxim.) that masted simultaneously at the same site

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Journal of Forest Research

Abstract

A study of pre- and post-dispersal damage to the nuts of two beeches,Fagus crenata Blume andF. japonica Maxim., which masted simultaneously, was performed on a single site in Japan. Most insect damage to the nuts before dispersal resulted from boring by lepidopteran larvae, and the level of attack was markedly higher onF. crenata than onF. japonica. Early nut growth ofF. crenata allowed these borers to act as the first attackers on the nuts. Conversely, late nut growth ofF. japonica delayed the attack of borers, and foliage feeders acted as the first attackers instead, chewing on nuts from the outside. The low level of borer attacks on the nuts ofF. japonica in mast years was thought to have been caused by foliage feeders decreasing the amount of food resource available for later attack by borers in lean years. This could then lead to a subsequent depression of the population of borers in mast years. The proportion of nuts damaged by moth larvae was independent of the density of nuts for both beech species. Caching by vertebrates was thought to be the most important factor in post-dispersal damage because the density of nuts of both beech species on the forest floor in March was half the level measured using seed traps in the previous year. However, post-germination damage caused by a fungus was also an important factor. The survival rate of the nuts (including current-year seedlings) in the year after dispersal was independent of the density of dispersed sound nuts in the previous year for both beech species, with the exception of one set of observations (forF. japonica in July).

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Authors and Affiliations

  1. Kansai Research Center, Forestry and Forest Products Research Institute, 612-0855, Kyoto, Japan

    Akira Ueda

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  1. Akira Ueda
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This research was supported in part by a grant from the Japanese Ministry of Agriculture, Forestry and Fisheries.

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Ueda, A. Pre- and post-dispersal damage to the nuts of two beech species (Fagus crenata blume andF. japonica Maxim.) that masted simultaneously at the same site. J For Res 5, 21–29 (2000). https://doi.org/10.1007/BF02762759

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  • DOI: https://doi.org/10.1007/BF02762759

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