@inbook {392, title = {Sierran vegetation: A gap analysis}, booktitle = {Sierra Nevada Ecosystem Project: Final Report to Congress, vol. II, Assessments and scientific basis for management options}, year = {1996}, pages = {671-689}, publisher = {University of California, Centers for Water and Wildlands Resources}, organization = {University of California, Centers for Water and Wildlands Resources}, address = {Davis, California}, abstract = {Gap analysis assesses the distribution of plant community types and vertebrate species distributions among land classes defined by ownership and levels of protection of biodiversity. Gap analysis helps to identify which plant communities and species might be especially vulnerable to different human activities that can lead to habitat conversion or degradation. This chapter presents a gap analysis of plant community types the Sierra Nevada region, an area of 63,111 km2 (24,368 mi2). Ownership of the region is 37\% private, 47\% national forests, 10\% national parks, 5\% Bureau of Land Management, and less than 2\% in other public lands. Land ownership and land management patterns contrast sharply between the northern Sierra Nevada versus the central and southern subregions. Parks and reserve lands contribute less than 2\% of the northern region versus 27\% of the central/southern. We mapped eighty-eight natural plant community types within the region. Sixty-seven types were mapped over areas greater than 25 km2 (9.65 mi2). The ownership profiles of Sierran plant communities systematically reflect the concentration of private lands at lower elevations and of national parks in the central and southern portion of the range. Less than 1\% of the foothill woodland zone of the Sierra Nevada is in designated reserves or other areas managed primarily for native biodiversity, and over 95\% of the distribution of most foothill community types is available for grazing. Low to middle elevation Sierran forests are not well represented in designated reserves, especially in the northern Sierra Nevada. However, large areas of most of these forest types on U.S. Forest Service lands have been administratively withdrawn from intensive timber management based on current forest plans. Many high-elevation forest and shrubland community types are well represented in parks and ungrazed wilderness areas. Our analysis identifies thirty-two widespread community types whose conservation status warrants concern and twelve types that appear well protected based on their present distributions.}, keywords = {California, gap analysis, land management, Sierra Nevada, vegetation}, author = {Davis, F. W. and Stoms, D. M.} } @article {389, title = {Gap analysis of the actual vegetation of California: 1. The Southwestern Region}, journal = {Madrono}, volume = {42}, number = {1}, year = {1995}, pages = {40-78}, abstract = {Gap Analysis is a method of conservation risk assessment that evaluates the protection status of plant communities, animal species and vertebrate species richness by overlay of biological distribution data on a map of existing biological reserves. The National Biological Survey has undertaken a national Gap Analysis that is being conducted by individual states but that will eventually produce regional and national assessments. Given California{\textquoteright}s size and complexity, we are conducting separate Gap Analyses for each of the state{\textquoteright}s 10 ecological regions, as delineated in The Jepson Manual. Here we summarize our findings on the distribution of plant communities and dominant plant species in the Southwestern Region of California, exclusive of the Channel Islands. We tabulate and discuss regional distribution patterns, management status and patterns of land ownership for 76 dominant woody species and 62 natural communities. Nineteen of 62 mapped communities appear to be at risk, as determined by their poor representation in existing reserves, parks or wilderness areas. Communities restricted largely to the lower elevations, such as non-native grasslands and coastal sage scrub types, are clearly at considerable risk. A majority of the lands at these elevations have already been converted to agricultural or urban uses and most of the remaining lands are threatened with future urbanization. Areas that appear to be of highest priority for conservation action based on agreement between our analysis and a recent assessment by The Nature Conservancy include the Santa Margarita River, San Mateo Creek, Miramar Mesa, Santa Clara floodplain near Fillmore, Sespe and Piru Canyons, and Tejon Pass.}, keywords = {California, gap analysis, vegetation}, author = {Davis, F. W. and Stine, P. A. and Stoms, D. M. and Borchert, M. I. and Hollander, A. D.} } @inbook {638, title = {Sensitivity of fire regime in chaparral ecosystems in climate change}, booktitle = {Ecological Studies Analysis and Synthesis, Vol. 117. Global change and mediterranean-type ecosystems; International Symposium, Valencia, Spain, September 1992}, year = {1995}, month = {1995}, pages = {435-456}, publisher = {Springer-Verlag New York, Inc.}, organization = {Springer-Verlag New York, Inc.}, address = {New York, New York, USA; Berlin, Germany}, keywords = {(Biophysics--Biocybernetics (1972- )), (Ecology, (General Biology--Information, Documentation, Retrieval and Computer Applications), (Mathematical Biology and Statistical Methods), Book Chapter, California, Computer Simulation, Ecology, Environmental Biology--Bioclimatology and Biometeorology), Environmental Biology--Plant), Fire History, Mathematical Model, Meeting Paper, Plantae-Unspecified, Plants, Usa, vegetation}, author = {Davis, F. W. and Michaelsen, J.}, editor = {Moreno, J. M. and Oechel, W. C.} }