OPCNMOrgan Pipe Cactus National Monument (Arizona, USA)
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For example, peak regeneration episodes have been observed from 1916 through 1936 in southeastern California (Brum 1973), 1907 through 1959 in the Sierra del Pinacate Reserve in northern Sonora, Mexico (Turner 1990), and 1915 through 1940 at Organ Pipe Cactus National Monument (OPCNM) in southwestern Arizona (Parker 1993).
The lack of regeneration during the wet years between 1905 through 1908 and 1914 through 1920 also was observed at OPCNM, where low regeneration was attributed to high frost frequency (Parker 1993).
Parker (1993) observed that grazing also has contributed to the recent decline in saguaros at OPCNM and that adverse effects of land use on saguaro regeneration may be more pronounced when climate conditions are stressful.