Abstract
We discuss four potentially important interactions between mycorrhizal fungi and populations of plants. First, vesicular-arbuscular mycorrhizal colonization has been shown to increase reproduction (via both male and female functions) and offspring survival, and thus it can increase population size, at least in the short term. This is undoubtedly important to wild plant species and especially to those whose success depends on high rates of reproduction such as early successional annuals. Second, the positive response in growth and reproduction to vesicular-arbuscular mycorrhizal colonization may be inversely related to plant population density. All else being equal, this would tend to stabilize the density of natural plant populations over time. It may also explain why positive responses to mycorrhizal inoculation of dense crops are rare. Third, vesicular-arbuscular mycorrhizal fungi can increase inequality in size and reproduction among plants within a population. Mycorrhizal fungi may thus exaggerate the genetic overrepresentation in the next generation of the most robust individuals in the current generation. Fourth, established mycorrhizal plants may serve as important sources of inoculum for initially nonmycorrhizal, conspecific seedlings. This may affect regeneration, and could contribute to patchy distributions of species within the community.
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Koide, R.T., Dickie, I.A. (2002). Effects of mycorrhizal fungi on plant populations. In: Smith, S.E., Smith, F.A. (eds) Diversity and Integration in Mycorrhizas. Developments in Plant and Soil Sciences, vol 94. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1284-2_30
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DOI: https://doi.org/10.1007/978-94-017-1284-2_30
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