Lomatium bradshawii (Bradshaw’s lomatium) is listed by the U.S. Fish and Wildlife Service (USFWS), the Oregon Department of Agriculture (ODA), and the Oregon Natural Heritage Program (ONHP) as an endangered species (ONHP 1998). The conservation of the species is therefore of mutual concern to federal, state, and other agencies. Tools for management of the species and its habitat are needed to ensure long-term population sustainability in a fragmented landscape. A USFWS recovery plan for L. bradshawii (Parenti et al. 1993) targets population monitoring and enhancement as two actions needed to meet recovery objectives for the species. Population monitoring alone will not contribute to the species’ recovery unless it is combined with rigorous analysis to identify populations at risk and evaluate enhancement techniques. The goal of this report is to evaluate the effects of fire on the population dynamics and trends of L. bradshawii at three federally-managed sites, from 1988 through 1997. Analyses of the effect of fire using transition matrix models (over the period of 1988- 1993) have been reported previously and are update here.
Research into the pollination biology of the species, including interactions with insect floral-visitors that could be influenced by applications of pesticides in adjacent habitat, has been reported elsewhere (Kaye and Kirkland 1994).