C. Jiménez-Sierra, Erika Arroyo‐Pérez, M. L. Matias-Palafox, D. Jiménez, A. B. Solorio, Alejandra Quintanar-Isaías, María de los Ángeles González‐Adán, Benito Quesada
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引用次数: 0
Abstract
The saguaro is an endemic and emblematic columnar cactus of the Sonoran Desert that offers refuge and food to different species. Climate change and increased ultraviolet exposure are threatening this species. Although reports of an increase in “epidermal browning” in saguaro populations in the United States have been published, to the best of our knowledge, no studies of this or other types of damage to Mexican saguaro populations are available. The present research is the first report of its kind performed in a saguaro population in the El Pinacate and Gran Desierto de Altar Biosphere Reserve (Sonora, Mexico). Seven types of damage were evaluated and classified in saguaro stems: cactus cortical scaling (CCS = epidermal browning), girdling, shell, exposed root, eyelet, termite tubes, and topping cuts. In addition, an anatomical comparison of healthy and CCS‐damaged tissues is presented. Shell was the most frequent type of damage (91% of individuals), followed by CCS (73%). Girdling occurred mainly in small organisms. Shell, exposed root, eyelet, and termite tubes tended to occur more frequently in larger organisms, whereas CCS tended to be more evenly distributed among differently sized individuals. Of all individuals, 3.3% were undamaged, 89.2% were moderately damaged, and 7.5% were highly damaged. CCS damage causes differences in the composition of the tissues, as well as in stomata distribution, thus compromising the photosynthetic function of the stem. The snapshot of the state of the individuals provided in the present study highlights the need for longer‐term studies considering the long life cycle of the saguaro to develop conservation strategies.
期刊介绍:
Plant Species Biology is published four times a year by The Society for the Study of Species Biology. Plant Species Biology publishes research manuscripts in the fields of population biology, pollination biology, evolutionary ecology, biosystematics, co-evolution, and any other related fields in biology. In addition to full length papers, the journal also includes short research papers as notes and comments. Invited articles may be accepted or occasion at the request of the Editorial Board. Manuscripts should contain new results of empirical and/or theoretical investigations concerning facts, processes, mechanisms or concepts of evolutionary as well as biological phenomena. Papers that are purely descriptive are not suitable for this journal. Notes & comments of the following contents will not be accepted for publication: Development of DNA markers. The journal is introducing ''Life history monographs of Japanese plant species''. The journal is dedicated to minimizing the time between submission, review and publication and to providing a high quality forum for original research in Plant Species Biology.