Cervid Exclusion Alters Boreal Forest Properties with Little Cascading Impacts on Soils

Anders Lorentzen Kolstad (Corresponding Author), Gunnar Austrheim, Erling J. Solberg, Aurel M. A. Venete, Sarah J. Woodin, James D. M. Speed

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Abstract

Large herbivores are capable of modifying entire ecosystems with a combination of direct (e.g. browsing/grazing, trampling, defecation) and indirect (e.g. affecting plant species composition that then alters soil properties) effects. With many ungulate populations increasing across the northern hemisphere it is important to develop a general theory for how these animals can be expected to impact their habitats. Here we present the results of an eight-year experimental exclusion of moose (Alces alces) from 15 recent boreal forest clear-cut sites in central Norway. We used standard univariate techniques to describe the treatment effect on multiple forest and soil properties and combined this with a multivariate Bayesian network structure learning approach to objectively assess the potential mechanistic pathways for indirect effects on soils and soil fertility. We found that excluding moose had predictable direct effects, such as increasing the ratio of deciduous to coniferous tree biomass and the canopy cover and decreasing soil bulk density and temperature. However, we found no treatment effects on any measures of soil processes or quality (decomposition, nitrogen availability, C:N ratio, pH, nutrient stocks), and furthermore, we found only limited evidence that the direct effects had cascading (indirect) effects on soils. These findings oppose the commonly held belief that moose exclusion will increase soil fertility, but still highlights the strong ability of moose to directly modify forested ecosystems.
Original languageEnglish
Pages (from-to)1027-1041
Number of pages15
JournalEcosystems
Volume21
Issue number5
Early online date13 Nov 2017
DOIs
Publication statusPublished - Aug 2018

Keywords

  • Alces alces
  • Cervid
  • boreal forest
  • herbivory
  • Norway
  • Bayesian Network
  • nitrogen availability
  • tea bag index
  • carbon stocks

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    Kolstad, A. L., Austrheim, G., Solberg, E. J., Venete, A. M. A., Woodin, S. J., & Speed, J. D. M. (2018). Cervid Exclusion Alters Boreal Forest Properties with Little Cascading Impacts on Soils. Ecosystems, 21(5), 1027-1041. https://doi.org/10.1007/s10021-017-0202-4