TY - JOUR
T1 - Modern pollen and vegetation relationships in the mountains of southern California, USA
AU - Anderson, R. Scott
AU - Koehler, Peter A.
N1 - Funding Information:
We are grateful for the assistance of several individuals in this study. Technical support came from Susan Goldberg and Jill Onken of Applied Earthworks, Inc., while financial support came from the Metropolitan Water District. We thank Susan Smith and Ron Redsteer for assistance with calculations and the graphics, and Geoffrey Spaulding for introducing us to the region and for helpful discussions on the research. We also thank several anonymous reviewers for their thoughtful comments.
PY - 2003
Y1 - 2003
N2 - The relationship between modern pollen assemblages and modern vegetation along two elevational transects within the Transverse and Peninsular Ranges of southern California, USA, is demonstrated using cluster analysis of the pollen data. Cluster analysis separates the Sonora Desert vegetation, Valley grassland/agricultural land and chaparral vegetation types on the San Jacinto Mountains transect. Chaparral is not easily separated on the San Bernardino Mountains transect, probably due to the presence of Quercus dumosa (scrub oak) there. The lower montane Quercus - Pinus (oak - pine) community is distinct from other forest types, and can be subdivided palynologically based upon relative importance of Quercus, Pinus and Cupressaceae [primarily Calocedrus decurrens (incense cedar)] pollen. Subdivisions include Quercus - Pinus - Cupressaceae, Quercus - Cupressaceae Pinus and Quercus - Pinus assemblages. Higher elevation Pinus - Abies (pine - fir) and Pinus-dominated communities are also differentiated from one another, although the subalpine vegetation type only occurs on the San Bernardino Mountains transect. Though the study area presently straddles a transition between winter-wet and summer-wet climatic regimes, differences between the pollen assemblages in the two mountain ranges are minimal. Pollen assemblages from lower elevations document the effects of human activities, primarily agriculture, on the modern pollen rain of the region, with the occurrence of introduced citrus (Citrus sp.) and shade (Eucalyptus sp.) trees and weedy disturbance indicators (e.g., Brassicaceae).
AB - The relationship between modern pollen assemblages and modern vegetation along two elevational transects within the Transverse and Peninsular Ranges of southern California, USA, is demonstrated using cluster analysis of the pollen data. Cluster analysis separates the Sonora Desert vegetation, Valley grassland/agricultural land and chaparral vegetation types on the San Jacinto Mountains transect. Chaparral is not easily separated on the San Bernardino Mountains transect, probably due to the presence of Quercus dumosa (scrub oak) there. The lower montane Quercus - Pinus (oak - pine) community is distinct from other forest types, and can be subdivided palynologically based upon relative importance of Quercus, Pinus and Cupressaceae [primarily Calocedrus decurrens (incense cedar)] pollen. Subdivisions include Quercus - Pinus - Cupressaceae, Quercus - Cupressaceae Pinus and Quercus - Pinus assemblages. Higher elevation Pinus - Abies (pine - fir) and Pinus-dominated communities are also differentiated from one another, although the subalpine vegetation type only occurs on the San Bernardino Mountains transect. Though the study area presently straddles a transition between winter-wet and summer-wet climatic regimes, differences between the pollen assemblages in the two mountain ranges are minimal. Pollen assemblages from lower elevations document the effects of human activities, primarily agriculture, on the modern pollen rain of the region, with the occurrence of introduced citrus (Citrus sp.) and shade (Eucalyptus sp.) trees and weedy disturbance indicators (e.g., Brassicaceae).
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U2 - 10.1080/00173130310009949
DO - 10.1080/00173130310009949
M3 - Article
AN - SCOPUS:0141814612
SN - 0017-3134
VL - 42
SP - 129
EP - 146
JO - Grana
JF - Grana
IS - 3
ER -