Progress 01/01/04 to 12/30/04
Results of the Astragalus scaphoides research were submitted for publication as two manuscripts in The American Naturalist. I continued long-term monitoring of several perennial geophytes: Anenome patens, Astragalus scaphoides, Balsamorhiza sagitata, Lewisia rediviva and Silene spaldingii, and presented analyses of this research at the 2004 Ecological Society of America annual meeting in Portland, OR. We mapped populations of orange hawkweed (Hieracium auriantiacum), a nonnative plant, in NW Montana, and began experiments to test the effects of competition on seedling establishment and clonal spread in this species. Because the species is apomictic, we developed ISSR markers to test whether all plants are genetically uniform; our initial surveys did not reveal any differences among individuals. We compared the distribution and abundance of species with restricted ranges vs. ecologically similar widespread species. We initiated studies of the spatial scale of synchrony
in cone production of whitebark pine, and ecologically-important, mast-seeding tree.
These studies are basic research, designed to increase understanding of the natural history of perennial herbs, about which very little is known. Silene spaldingii is a federally-listed threatened species, Astragalus scaphoides is found only in a small part of SW Montana and adjacent Idaho, and Hieracium auriantiacum is an invasive plant in many areas where it occurs. Our research may provide a basis for future management of these species.
- Holl, K. D. and E. E. Crone. 2004. Applicability of landscape and island biogeography theory to restoration of riparian understorey plants. Journal of Applied Ecology 41:922-933
- Irvine, R. L., E. E. Crone, L. J. Jackson, and E. A. MacIsaac, 2004. Does scale affect ecological model predictions? A test with lake responses to fertilization. Ecological Applications 14:1178-1188.
- Crone, E. E. and P. Lesica, 2004. Causes of synchronous flowering in Astragalus scaphoides, an iteroparous perennial plant. Ecology 85:1944-1954.