To better understand vegetation succession in the Los Angeles, California basin, modern aerial photos (1980) were measured and compared to older aerial photos (1928 & 1936), spanning roughly 50 years of vegetation change. Through this comparison, the authors found that shrublands and grasslands formed a dynamic mosaic.
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Fruedenberger, D.O., B.E. Fish, and J.E. Keeley. 1987. Distribution and stability of grasslands in the Los Angeles basin. Bull. Southern California Acad. Sci. 86(1):13-26.