Study

Grass-skipper (Hesperiinae) trends in midwestern USA grasslands during 1988-2013

  • Published source details Swengel A.B. & Swengel S.R. (2015) Grass-skipper (Hesperiinae) trends in midwestern USA grasslands during 1988-2013. Journal of Insect Conservation, 19, 279-292.

Actions

This study is summarised as evidence for the following.

Action Category

Use rotational burning

Action Link
Butterfly and Moth Conservation
  1. Use rotational burning

    A replicated, site comparison study in 1988–2013 in 24 prairies, pine-oak barrens and fields in Wisconsin, USA (Swengel & Swengel 2015) found that prairies managed by rotational burning had more strongly declining populations of grass-skipper butterflies (Hesperiinae) than unmanaged pine barrens or lightly managed fields. In prairies managed by rotational burning, specialist and grassland skipper butterflies had more strongly declining population trends than in pine-oak barrens (specialist and grassland species) or old fields (grassland species only) (data presented as model results). Ten native prairies were managed by cool-season burning, typically on a 2–5-year rotation, with some mowing, cutting and spot herbicide application. Eight pine-oak barrens were last burned by wildfires in 1977 or 1988. Six fields reverting from agriculture were managed by burning, grazing, haying, cutting, herbicide or tilling, but with no more than 10% of a site managed each year. In spring and summer 1988–2013, butterflies were surveyed along transects (2–3 km/hour) at each site, generally at least twice/year and in at least two years/site. Skippers were classified as eight “specialist” (restricted to native grassland habitat) or five “grassland” (occurring widely in open habitat) species.

    (Summarised by: Andrew Bladon)

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 19

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