Approximately 80 total element occurrences. However, the number of discrete, isolated populations is somewhat less, and the degree to which many of the occurrences are threatened is significant. Threats include invasion of its habitat by native conifers and non-native shrubs and grasses, as well as development, grazing, and military training exercises.
Habitat loss: Loss of habitat by invasion of the noxious weed Scots broom (Cytisus scoparius). Fire suppression: The loss of fire allows Douglas fir (Pseduotsuga menziesii) to encroach onto the grasslands (NHP 2000, Giblin 1997).
Possibly military trai
Of the more than 80 sites, many are small, fragmented and isolated. (NHP 2000, Giblin 1997).
""A Demographic Analysis of the Impact of Army Disturbance on Aster curtus Population Viability""; lead researchers are University of Washington, The Nature Conservancy, and Range Control LCTA http://www.lewis.army.mil/ITAM/research.htm. On going.
Ewing, K. 2002. Mounding as a technique for restoration of prairie on a capped landfill in the Puget Sound lowlands. Restoration Ecology 10:289-296.
Kareiva, Peter. 1997. Designing a research plan for an endangered plant on Ft. Lewis
Giblin, David Emmett. 1997.The relationships of reproductive biology and disturbance to the rarity of Aster curtus (Cronq.), a Pacific Northwest endemic
Clampitt, Christopher Alan. 1984. The ecological life history of Aster curtus, a grassland endemic in a forested region
The Washington sate Department of Natural Resources Natural Heritage Program holds responsibility for managing the species. Mechanical removal of the invasive Scots Broom (Cytisus scoparius) and prescribed fire to prevent the encroachment of Douglas fir (Pseudotsuga menziesii) are two management tools the agency recommends for controlling threats to white-topped aster.
In addition to research on Scots broom control and prescribed burns, the Washington Natural Heritage Program and the U.S.D.I. Bureau of Land Management are calling for additional inventories throughout the species range.
A. curtus seeds were banked in the Miller Seed Vault at the Center for Urban Horticulture; Seattle, WA in the summer of 2003. Additional ex situ resources are needed to ensure conservation of the species.
Be the first to post an update!