Demographic changes over >70 yr in a population of saguaro cacti (Carnegiea gigantea) in the northern Sonoran Desert

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• 作者：Joshua L. Conver^a ; ¹ ; ^{converjl@mail.uc.edu} ; Theresa Foley^b ; ^{theresa.foley3@gmail.com} ; Daniel E. Winkler^c ; ^{winkler.de@gmail.com} ; Don E. Swann^a ; ^{don_swann@nps.gov}
• 关键词：Saguaro ; Sonoran desert ; National park ; Demography ; Population structure
• 刊名：Journal of Arid Environments
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：139
• 期：Complete
• 页码：41-48
• 全文大小：1296 K
• 卷排序：139

文摘

Intensive wood-cutting and grazing prevented saguaro establishment in the early 1900s. Saguaro establishment surged from 1960-1990 due to recovery of nurse plants and favorable climate. Establishment since the mid-1990s has been low. The population was dominated by mature adult saguaros in 1941 and by juveniles in 2012. We observed a 31.4% decrease in the number of saguaros from 1941 to 2012.