Study

Both bottom-up and top-down processes contribute to plant diversity maintenance in an edaphically heterogeneous ecosystem

  • Published source details Denyer J.L., Hartley S.E. & John E.A. (2010) Both bottom-up and top-down processes contribute to plant diversity maintenance in an edaphically heterogeneous ecosystem. Journal of Ecology, 98, 498-508

Actions

This study is summarised as evidence for the following.

Action Category

Use fences to exclude livestock from shrublands

Action Link
Shrubland and Heathland Conservation
  1. Use fences to exclude livestock from shrublands

    A randomized, replicated, paired, controlled study in 1997–2003 in a heathland site in the UK (Denyer et al. 2010) found that fencing to exclude livestock increased vegetation height and biomass, but had a mixed effect on the number of plant species. After six years and in five of six comparisons, vegetation was taller in fenced areas (32–137 cm) than in unfenced areas (4–16 cm). Plant biomass was higher in fenced areas (1352–2832 g/m2) than in unfenced areas (751 g/m2). In one of two comparisons the number of plant species in fenced areas was lower (9 species) than in unfenced areas (17 species) but in one of two comparisons there was no significant difference in the number of plant species (fenced: 16 species, unfenced 17 species). The site was grazed by approximately 20 sheep throughout the study. Twenty four 4 x 4 m plots that were fenced to exclude livestock were established at the site, along with 12 unfenced plots. Half of the fenced plots could be accessed by rabbits that were present at the site. All plots were paired. In 2003 vegetation height was measured in each plot using a ruler and vegetation was harvested from subplots adjacent to plots to calculate biomass. Vegetation cover of all plant species was recorded in plots 2003.

    (Summarised by: Phil Martin)

Output references

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, terrestrial mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 18

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust