California Department of Fish & Game U.S. Fish and Wildlife Service: Endangered Species Act (Section-6) Grant-in-Aid Program FINAL PROJECT REPORT E-2-P-35 An Investigation of the Reproductive Ecology and Seed Bank Dynamics of Burke’s Goldfields (Lasthenia burkei), Sonoma Sunshine (Blennosperma bakeri), and Sebastopol Meadowfoam (Limnanthes vinculans) in Natural and Constructed Vernal Pools Christina M. Sloop1, 2, Kandis Gilmore1, Hattie Brown3, Nathan E. Rank1 1Department of Biology, Sonoma State University, Rohnert Park, CA 2San Francisco Bay Joint Venture, Fairfax, CA 3Laguna de Santa Rosa Foundation, Santa Rosa, CA Prepared for Cherilyn Burton (
[email protected]) California Department of Fish and Game, Habitat Conservation Division 1416 Ninth Street, Room 1280, Sacramento, CA 95814 March 1, 2012 1 1. Location of work: Santa Rosa Plain, Sonoma County, California 2. Background: Burke’s goldfield (Lasthenia burkei), a small, slender annual herb in the sunflower family (Asteraceae), is known only from southern portions of Lake and Mendocino counties and from northeastern Sonoma County. Historically, 39 populations were known from the Santa Rosa Plain, two sites in Lake County, and one site in Mendocino County. The occurrence in Mendocino County is most likely extirpated. From north to south on the Santa Rosa Plain, the species ranges from north of the community of Windsor to east of the city of Sebastopol. The long-term viability of many populations of Burke’s goldfields is particularly problematic due to population decline. There are currently 20 known extant populations, a subset of which were inoculated into pools at constructed sites to mitigate the loss of natural populations in the context of development.