By Geraldine H. Tepper
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Additional info for Species Diversity and Extinction
Cuttings are left under sunlight for two weeks to facilitate cicatrisation of the cut-area in order to avoid microorganism infections after planting. Later on, cactus cuttings are sown on trenches to which goat‘s manure has been previously added. The plantation takes place at the end of April or beginning of May, few weeks before the raining season starts (Casas, 2002). Vegetative propagation of cylindroopuntias (―chollas‖) is carried out with stem segments that are derived from donor plants and then they are rooted.
On the other hand, soil type plays an important role regarding the observed cacti distribution and endemism rate (Johnston, 1977; Powell and Turner, 1977). For instance, within the CDR were found obligated gypsophile cacti species, such as Aztekium riterri, A. hintonii, Geohintonia mexicana and Turbinicarpus zaragozae (Hernández and GómezHinostrosa, 2005). The cacti species selectivity, depending on soil type, was described in the Mexican Threatened Cacti: Current Status and Strategies for Their Conservation 17 calcifuge Ferocactus histrix and the calcicole Echinocactus platyacanthus distribution.
This botanic garden has more than 50% of threatened-wild cacti that are in the Cactaceae Checklist (1992). 28 M. S. Santos-Díaz, E. Pérez-Molphe, R. Ramírez-Malagón et al. Vivero y Jardín Botánico Comisión Federal de Electricidad (CFE), “Cactus del Noreste”. Address: Calle Orión No. pdf). This nursery was established as a consequence of CFE‘s building and construction work that led to the Digitostigma caput-medusae (medusa head) discovery by CFE workers in June 2001. Medusa-head cactus distribution is extremely restricted, which causes that this plant is highly vulnerable.