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• W2469157009 abstract "Californian coastal sage scrub, a soft-leaved mediterranean-climate shrubland, is disappearing rapidly as urbanization spreads. Previous researchers classified the community on a regional spatial scale: three associations within the full range of southern coastal sage scrub and 1 1 within two of the geographic associations were identified. Ordination analysis of 54 sites at Starr Ranch in Orange County, CA, revealed that similar to some regional groupings are found at the local level. Whereas gradients in temperature and precipitation are the strongest predictors of distribution at the regional scale, topographic and edaphic variables were most influential at our site. Five of coastal sage scrub and their environmental relationships were derived: Salvia apiana-Artemisia californica-Eriogonum fasciculatum dominated sites with southerly aspects and coarser soils; Artemisia californica-Lotus scoparius was prevalent on northerly aspects; no correlation with environmental factors was found for Salvia mellifera. There were two transitional groups. The variation in floristics and habitat found at our relatively small study site has strong implications for conservation planning. We urge land managers to identify local in order to protect the variability over short distances (±50 m) characteristic of southern coastal sage scrub. Coastal sage scrub is a halfwoody, facultatively drought deciduous and seasonally dimorphic, shallow-rooted, soft-leaved shrubland that is entirely confined to the mediterranean-climate zone in North America. Its range extends from the San Francisco Bay Region, Alta California, USA, to El Rosario in Baja California, Mexico (Westman 1981b). Of the several classification systems proposed for coastal sage (Thorne 1976; Kirkpatrick and Hutchinson 1977; Axelrod 1978; Westman 1981b; Mooney 1988), only those of Westman and Kirkpatrick and Hutchinson are derived from quantitative studies. All systems except that of Kirkpatrick and Hutchinson include the full geographic range of the community and are based on latitudinal changes in species composition from Baja California to northern California. A northern and southern division of coastal sage scrub are recognized (Thorne 1976; Axelrod 1978; Westman 1981b; Mooney 1988). The southern coastal sage scrub comprises three floristic associations: the coastal Venturan, the cismontane inland Riversidian, Madrono, Vol. 39, No. 3, 170-188, 1992 This content downloaded from 157.55.39.182 on Mon, 16 May 2016 05:43:37 UTC All use subject to http://about.jstor.org/terms 1 992] DESIMONE AND BURK: COASTAL SAGE SCRUB 1 7 1 and the Baja-influenced Diegan (Axelrod 1978; Westman 1981b, 1983a). Westman distinguished two Ventaran subassociations. Kirkpatrick and Hutchinson (1977), using data from 120 sites from coastal Santa Barbara 266 km inland to Banning, described 1 1 (their associations) distributed between an inland basin and a coastal region. Their study area, approximately 140 km northwest and 50 km east of the present study area, lies within the central part of coastal sage scrub distribution in what appear to be the Ventaran and Riversidian associations. There have been only two quantitative studies of the habitat factors associated with coastal sage scrub distribution. Kirkpatrick and Hutchinson (1980) found that the variable best correlated with distribution patterns of their 1 1 subassociations is mean annual range in temperature. Although nine are concentrated within altitudinal zones, they found few strong relationships with other environmental factors (aspect, slope, substrate). The four Alta California associations of Westman (Diablan, Ventaran, Riversidian, and Diegan) reflect a geographic/climatic gradient of increasing evapotranspirative stress from northern to southern and coastal to inland sites (Westman 1981b, 1 983a). Sharp species segregation was detected only in the Venturan association in which distributions of dominant species were related to moisture preference as influenced by aspect and soil texture. Conclusions about both community and species level distributions are dependent upon the size of the study area (Lepart and Debussche 1980). Differences in scale produce differences in conclusions about the degree of community structure, importance of stochastic effects, and roles of distributional factors (Wiens et al. 1986). Although the urgency of coastal sage scrub preservation has been recognized (Kirkpatrick and Hutchinson 1977; Axelrod 1978; Westman 1981a, b, 1982), there is a need for more information on variability within each association. The major geographical associations are not designated by distinguishing species because each one has several distinct communities whose composition depends on such factors as exposure and soil depth (Axelrod 1978). Identification of such component communities has become increasingly important since, as a result of habitat decline, several animal species associated with sage scrub are candidates for listing at federally endangered status. One such bird species, the California Gnatcatcher, has been found in a limited number of studies to be associated with certain floristic and structural coastal sage scrub sub-types (Atwood 1990). The goals of this research were to explore the pattern of coastal sage scrub distribution on a local scale, generate hypotheses to explain habitat effects upon local community structure, then contrast results to the two regional scale studies of sage scrub classification and environmental relationships. This content downloaded from 157.55.39.182 on Mon, 16 May 2016 05:43:37 UTC All use subject to http://about.jstor.org/terms 172 MADRONO [Vol. 39 Fig. 1 . The location of Starr Ranch Sanctuary in Orange County, California." @default.
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• W2469157009 date "1992-01-01" @default.
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• W2469157009 title "Local variation in floristics and distributional factors in californian coastal sage scrub" @default.
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