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PC25 Doc. 39.2 Original language: Spanish PC25 Doc. 39.2 CONVENTION ON INTERNATIONAL TRADE IN ENDANGERED SPECIES OF WILD FAUNA AND FLORA ___________________ Twenty-fifth meeting of the Plants Committee Geneva (Switzerland), 17 and 20-23 July 2020 Species specific matters Maintenance of the Appendices Periodic Review of species included in Appendices I and II PERIODIC REVIEW OF ARIOCARPUS RETUSUS 1. This document has been submitted by Mexico (Scientific Authority of Mexico – CONABIO).* 2. During the 23rd meeting of the Plants Committee (Geneva, Switzerland, July 2017), in response to Notification to the Parties No. 2017/069, Mexico volunteered to assess Ariocarpus retusus as part of the periodic review of species included in the CITES Appendices in accordance with Resolution Conf. 14.8 (Rev. CoP17). 3. Ariocarpus retusus is a cactus that is endemic to Mexico. Its distribution is restricted to the Chihuahuan Desert, where it grows on rocky limestone hills with dry shrubland vegetation. The potential area of distribution of the species is about 100,000 km2, but its area of occupancy has been estimated to range between 10,490 km2 and 12,661.15 km2. Only 8.6% of the area of occupancy of A. retusus falls within a protected area. The estimated population size was ~ 9,252.36 individuals in 2019. The species has intrinsic biological, reproductive and demographic restrictions which, combined with changes in land use and illegal harvest of wild specimens, pose a threat to the persistence and viability of its wild populations. 4. There is high demand of A. retusus in international trade because it is one of the species most appreciated by collectors. Between 2000 and 2018, over 800 exports were recorded in the database of the World Conservation Monitoring Centre (UNEP-WCMC). Between 2019 and 2020, a total of 1,591 individuals of A. retusus were recorded to be offered for sale online. Yet, only Germany, Italy and the Czech Republic have registered nurseries that artificially propagate the species. 5. After reviewing the status of the species, Mexico recommends that Ariocarpus retusus remain in CITES Appendix I, in accordance with the following criteria of Resolution Conf. 9.24 (Rev. CoP17), Annex 1: A (i, ii, iii, v), B (i, ii, iii, iv), C (i, ii). * The geographical designations employed in this document do not imply the expression of any opinion whatsoever on the part of the CITES Secretariat (or the United Nations Environment Programme) concerning the legal status of any country, territory, or area, or concerning the delimitation of its frontiers or boundaries. The responsibility for the contents of the document rests exclusively with its author. PC25 Doc. 39.2 – p. 1 PC25 Doc. 39.2 Annex A. Proposal resulting from the periodic review Maintain Ariocarpus retusus in CITES Appendix I, in accordance with the following criteria of Resolution Conf. 9.24 (Rev. CoP17), Annex 1: A (i, ii, iii, v), B (i, ii, iii, iv), C (i, ii). B. Proponent Mexico* C. Supporting statement 1. Taxonomy 1.1 Class: Magnoliopsida 1.2 Order: Caryophyllales 1.3 Family: Cactaceae 1.4 Genus, species or subspecies, including author and year: Ariocarpus retusus (Scheidw 1938) 1.5 Scientific synonyms: See Annex 1 1.6 Common names: English: Wild peyote, living rock, seven stars French: Spanish: chaute, chautle, falso peyote, peyote cimarrón, pezuña de venado, cactus estrella, peyote brujo, peyote loco 1.7 Code numbers: 18189 2. Overview At the 23rd meeting of the Plants Committee (2017, Geneva), Mexico volunteered to assess Ariocarpus retusus as part of the Periodic Review in accordance with Resolution Conf. 14.8 (Rev. CoP17) during the period between CoP17 and CoP19. 3. Species characteristics 3.1 Distribution Ariocarpus retusus is endemic to Mexico; it is the species with the second largest distribution of the genus Ariocarpus (Hernández et al. 2010) and occurs in the States of Coahuila, Nuevo León, San Luis Potosí, Tamaulipas, Zacatecas and possibly Durango (Bravo-Hollis & Sánchez-Mejorada 1991; Guzmán et al. 2003). The current distribution of Ariocarpus retusus was determined by developing a potential distribution map based on georeferenced records of occurrence of the species and abiotic variables (Fig. 1). The resulting model suggests that A. retusus has a potential distribution of 113,138 km2, which represents approximately 21.2% of the total area of the Chihuahuan Desert, which is 533.660 km2 (Hernández et al. 2010). However, the distribution of the species may have been overestimated, as the model predicts suitable habitat sites based on environmental factors, without considering biological variables such as biotic interactions or even the life history of the species. According to Hernández and Navarro (2007), the species has an uneven distribution and requires specialized or restricted sites to become established, * The geographical designations employed in this document do not imply the expression of any opinion whatsoever on the part of the CITES Secretariat (or the United Nations Environment Programme) concerning the legal status of any country, territory, or area, or concerning the delimitation of its frontiers or boundaries. The responsibility for the contents of the document rests exclusively with its author. PC25 Doc. 39.2 – p. 2 such as rocky hills, which implies that its area of occupancy may in fact range between 10,490 km2 and 12,661 km2, which represents only 11.2% of its current estimated potential distribution (Fig. 1). Figure 1. Records of presence (red dots) and potential distribution (in green) of Ariocarpus retusus in Mexico in the States of Coahuila, Nuevo León, San Luis Potosí, Tamaulipas and Zacatecas. Areas in purple are protected areas in or near the species’ area of distribution. 3.2 Habitat The species occurs in desert and semi-desert areas of Mexico, on rocky limestone hills (Bravo-Hollis & Sánchez-Mejorada 1991, Rodríguez-Garza et al. 2011), in slopes ranging between 4 and 19° (Villavicencio Gutiérrez et al. 2010). It grows at elevations between 1,300 and 2,384 MASL, although in some sites of the State of Nuevo León it can be found in areas below 500 MASL (Flores 2011, Villavicencio Gutiérrez et al. 2013). The climate of the areas where A. retusus occurs is predominantly of the BSh type (i.e., warm steppe) with warm temperatures all year round and low rainfall, ranging between 250 and 500 mm annually. The soil where it generally grows is lithosol (or leptosol), that is, shallow soils (10 cm) that are rocky with abundant calcareous material. In 94.4% of the sites where A. retusus occurs, the predominant vegetation is dry scrub (Rzedowski 1978). It grows among individuals of its same species, rocks, other cacti and also under the canopy of plants such as Jatropha dioica and Dasylirion longissimum; this interaction is known as nursing. These nurse plants or objects can modify environmental conditions and generate a less extreme microclimate, which contributes to the establishment and growth of the species (Valiente-Banuet & Ezcurra 1991; Ramírez Collantes 2011). 3.3 Biological characteristics Individuals of A. retusus start to reproduce once they have reached a diameter greater than 6 cm. Given that the species is slow growing, it can take up to 10 years to reach flowering size in cultivation (Sato & Sugiri 1996; Kesseler & Stupp 2006; Cárdenas-Ramos 2015); this delay is probably different in wild conditions. Reproductive individuals of ~ 6 cm in diameter often produce one flower bud per reproductive season (September-November); by contrast, larger, older individuals produce up to five flowers, which allows the development of more fruits and seeds. The species only reproduces sexually (Flores 2011, Martínez-Peralta & Mandujano 2012), so it requires a sufficient number of reproductive individuals to flower at the same time and enough pollinators available (mainly bees; Martínez-Peralta & Mandujano 2012). PC25 Doc. 39.2 – p. 3 Seed release immediately follows the dehiscence of mature fruits. Seeds can be dispersed by water (hydrochory), wind (anemochory) or gravity (barochory; Rodríguez 2008, Flores 2011, Martínez-Peralta 2014c). Seeds are positively photoblastic (i.e., germination is induced by light; Flores & Jurado 2011, Rojas-Aréchiga et al. 2013) and exhibit physiological dormancy (i.e., certain conditions are required for maturation of the embryo; Orozco-Segovia et al. 2007). Seedlings start to develop secondary roots about 15 days after germination, and the first couple of tubercles grows between the cotyledons about 20 days after radicle emergence. Tubercles have five setose spines (i.e., with stiff hairs) at their tips (Olguín Santos 1994). 3.4 Morphological characteristics A. retusus is a subglobose cactus that is predominantly solitary and has a geophytic habit, given that its roots or stems can be found below the soil surface (Raunkiaer 1934; Vázquez-Sánchez et al. 1982; Bravo-Hollis & Sánchez-Mejorada 1991; Aguilar-Morales et al. 2011; Martínez Peralta 2014c). The underground stem has a highly developed system of mucilaginous canals that allows it to store water during the driest months of the year (Anderson 1962; Vázquez-Sánchez et al. 1982; Bravo-Hollis & Sánchez-Mejorada 1991). The plant has the shape of a rosette 12 cm high and 10-25 cm in diameter (Fig. 2a). The apex of the plant has numerous long setose white or yellowish trichomes that form a “wool” that grows from the flower areoles. The globose fleshy stem is buried in the soil and composed of numerous triangular tubercles that are attenuated toward the base, arranged in spirals. Tubercles are slightly longer than wide, 1.5-4 cm long and 1-3.5 cm wide. They are glaucous, greyish-green, with a chartaceous texture (i.e., like that of paper or parchment) and a convex or flat surface with shallow undulations or wrinkling, not fissured. Tubercles end in sharp tips, with small, circular, woolly spiniferous areoles 1-5 mm in diameter with or without small vestigial spines (Fig.
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