Study

Effects of cattle grazing on blue oak seedling damage and survival

  • Published source details Hall L.M., George M.R., McCreary D.D. & Adams T.E. (1992) Effects of cattle grazing on blue oak seedling damage and survival. Journal of Range Management, 45, 503-506.

Actions

This study is summarised as evidence for the following.

Action Category

Other biodiversity: Use seasonal grazing

Action Link
Mediterranean Farmland

Other biodiversity: Use fewer grazers

Action Link
Mediterranean Farmland

Other biodiversity: Exclude grazers

Action Link
Mediterranean Farmland
  1. Other biodiversity: Use seasonal grazing

    A replicated, randomized, controlled study in 1989–1991 in grasslands in north-central California, USA, found higher survival of, and less damage to, oak seedlings in plots grazed in winter, compared to plots grazed in spring or summer. Plants: More blue oak Quercus douglasii seedlings survived in winter-grazed plots, compared to spring- or summer-grazed plots (46–50% vs 7–29% survival). Seedlings in winter-grazed plots were less likely to be damaged by browsing or trampling, compared to those in spring- or summer-grazed plots (12–52% vs 40–93% of seedlings damaged). Methods: In December 1989, oak seedlings were planted in three pastures, each containing nine plots grazed for a week each in winter (January–February), spring (April), or summer (June–July), at one of three grazing intensities. Each plot received 24 seedlings (720 in total), of which half had the area around them treated with glyphosate herbicide to reduce competition from grass.

     

  2. Other biodiversity: Use fewer grazers

    A replicated, randomized, controlled study in 1989–1991 in grasslands in north-central California, USA, found that blue oak Quercus douglasii seedlings survived at similar rates but had less damage from cattle when planted in plots grazed by cattle at lower densities. Plants: Survival of seedlings after 15 months did not differ between plots grazed at low, medium, or high densities (7–50% survival). Fewer seedlings were damaged by browsing and trampling as grazer densities decreased (12–57%, 38–74%, and 52–93% of seedlings damaged in low, medium, and high density plots, respectively). Methods: In December 1989, oak seedlings were planted in three pastures, each containing nine plots grazed for a week each in winter, spring, or summer with low, medium and high densities of cattle (2.5, 7.5, and 15 animals/ha, respectively). Each plot received 24 seedlings (720 in total), of which half had the area around them treated with glyphosate herbicide to reduce competition from grass.

     

  3. Other biodiversity: Exclude grazers

    A replicated, randomized, controlled study in 1989–1991 in grasslands in north-central California, USA, found few differences in the survival of, or damage to, blue oak Quercus douglasii seedlings planted in pastures from which cattle were excluded, compared to grazed pastures. Plants: There were no differences in 15-month survival between seedlings planted in ungrazed plots, compared to those grazed by cattle in spring or summer (9–24% survival). Seedlings had lower survival in ungrazed plots, compared to winter grazed plots (15% vs 46%). The proportion of seedlings damaged by browsing or trampling did not differ between ungrazed and grazed plots (0–85% damaged). Methods: In December 1989, oak seedlings were planted in three pastures, each containing ten plots: one with cattle excluded and nine grazed for a week each at different intensities and at different times. Ungrazed plots were accessible to wild herbivores. Each plot received 24 seedlings (720 in total), of which half had the area around them treated with glyphosate herbicide to reduce competition from grass.

     

Output references
What Works 2021 cover

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, 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