The Giant Columnar Cactus Pachycereus Pringlei Adaptively Modifies Its Stem Shape from the Dry Tropics Into the Arid Mid-Latitude Deserts
Copyright Notice This electronic reprint is provided by the author(s) to be consulted by fellow scientists. It is not to be used for any purpose other than private study, scholarship, or research. Further reproduction or distribution of this reprint is restricted by copyright laws. If in doubt about fair use of reprints for research purposes, the user should review the copyright notice contained in the original journal from which this electronic reprint was made. Journal of Arid Environments 146 (2017) 10e17 Contents lists available at ScienceDirect Journal of Arid Environments journal homepage: www.elsevier.com/locate/jaridenv The giant columnar cactus Pachycereus pringlei adaptively modifies its stem shape from the dry tropics into the arid mid-latitude deserts * Mariana Delgado-Fernandez a, Pedro P. Garcillan a, , Exequiel Ezcurra b a Centro de Investigaciones Biologicas Del Noroeste, Av. Instituto Politecnico Nacional 195, La Paz, Baja California Sur 23096, Mexico b University of California Riverside, 900 University Avenue, Riverside, CA 92521, USA article info abstract Article history: Because of the lack of leaves, the distributions of columnar cacti are limited by their capacity to trade off Received 30 September 2016 their photosynthetic chlorenchyma and their non-photosynthetic storage parenchyma. For species with Received in revised form wide latitudinal ranges, variations in stem surface area:volume ratios could play an adaptive role. Based 13 April 2017 on the fact that Pachycereus pringlei spans more than a 1000 km along the Baja California Peninsula, we Accepted 3 July 2017 used this species to analyze changes in stem allometry between populations. We selected six sites, from Available online 12 July 2017 latitude 23e31 N, ranging from 518 to 55 mm of annual rainfall.
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