Faculty of Environmental and Forest Biology, State University of New York College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY 13210-2778, U.S.A.
Maintaining Critical Habitat in a Heavily Managed Landscape: Effects of Power Line Corridor Management on Karner Blue Butterfly (Lycaeides melissa samuelis) Habitat
Article first published online: 15 AUG 2005
Volume 13, Issue 3, pages 488–498, September 2005
How to Cite
Forrester, J. A., Leopold, D. J. and Hafner, S. D. (2005), Maintaining Critical Habitat in a Heavily Managed Landscape: Effects of Power Line Corridor Management on Karner Blue Butterfly (Lycaeides melissa samuelis) Habitat. Restoration Ecology, 13: 488–498. doi: 10.1111/j.1526-100X.2005.00061.x
- Issue published online: 15 AUG 2005
- Article first published online: 15 AUG 2005
- Blue lupine;
- Karner blue butterfly;
- Lupinus perennis;
- pine barrens;
- power line corridor;
The Karner blue butterfly (KBB) (Lycaeides melissa samuelis), a federally listed species, has historically been a component of barren and savannah ecosystems in the northeastern and midwestern United States. In New York, it now occurs primarily on managed, early-successional sites such as power line corridors (utility rights-of-way) from Albany to Glens Falls. Blue lupine (Lupinus perennis), the exclusive larval food source of the KBB, has been suggested to be the most limiting factor for the butterfly within the eastern portion of its range. Power line corridor management maintains early-successional habitats by suppressing the regrowth of woody species, creating potentially important habitat for the conservation and restoration of the KBB complex. This research compared the effects of several vegetation-clearing methods on Blue lupine populations and associated communities of nectar species for KBB over an 8-year period. Methods evaluated differed in intensity (annual, 4-, or 8-year intervals) and type (herbicide or mechanical). Blue lupine and plant community responses did not significantly differ among the treatment types applied to the power line corridors. However, Blue lupine cover, clump size, and density of stems per clump increased following the application of treatments in general. The number and cover of nectar species, total herbaceous cover, and species richness also responded positively to treatment overall. The percentage of non-native species temporarily increased following treatment but declined to near pre-treatment levels again as woody cover increased. Temporal changes in plant community composition were not related to management methods. The management tools assessed, mowing and herbicide application, will accomplish the goal of halting or reversing succession, maintaining critical habitat for the KBB in a landscape that provides little other suitable habitat.