Beaucarnea olsonii
V.Rojas-Piña & L.O.Alvarado
Description
species of plant in the family Asparagaceae
Pays · région · aire protégée · écorégion · biome
Pas d'interactions documentées pour cette espèce.
Liste rouge IUCN
EN · En dangercritères C1↘Décroissante- Évaluation
- 2020 · v3.1
- Altitude
- 1200 – 1500 m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
The population size appears to be fairly small. In 2016, Rojas-Piña and Alvarado-Cárdenas reported few mature individuals and even fewer young plants in the type locality. Local people confirm that this plant is very rare. Therefore, an amount of mature individuals of less than 2,500 is estimated in the entire range. These are experiencing a continuing decline due to the habitat threats. In fact, a continuing decline in the mature individuals of at least 20% may occur in the future (E. Martínez Salas pers. comm. 2019).
Menaces identifiées(5 menaces classées CMP-IUCN)
1_1Housing & urban areasVery Rapid DeclinesMajority (50-90%)Ongoing2_1_3Agro-industry farmingVery Rapid DeclinesMajority (50-90%)Ongoing2_3_4Scale Unknown/UnrecordedVery Rapid DeclinesUnknownOngoing5_2_1Intentional use (species is the target)Very Rapid DeclinesUnknownOngoing7_1_1Increase in fire frequency/intensityVery Rapid DeclinesMinority (<50%)Ongoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
The main threats to the genus Beaucarnea are the change in land use and the fragmentation of ecosystems. More specifically for this species, the type locality is surrounded by human settlements and agricultural fields, and grazing is also occurring. Additionally, frequent fires set by people occur every year, which potentially cause direct mortality. There are relatively few patches of intact forest suitable for the species nearby, so the continuing decline in habitat quality is another important threat (Rojas Piña and Alvarado-Cárdenas 2016). Finally, given its probable rarity and that Beaucarnea species in general are ruthlessly collected for the horticultural trade, it is very likely Beaucarnea olsonii is already being collected for illegal sale (E. Martínez Salas pers. comm. 2019).
Habitats préférentiels (classification IUCN)
1_5Forest - Subtropical/Tropical Dry★
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
There are no current conservation actions in place and the species is not known from any ex situ collections (BGCI 2019). The habitat of the taxon is being seriously threatened, so it is necessary to consider protection measures in situ or conservation in botanic gardens or in a genome resourse bank as measures of ex situ conservation. There is a need for tools that can provide an integrated assessment of human impacts on forest biodiversity and that can support decision making related to habitat restoration and forest use. Therefore, it would be beneficial to recommend sustainable production activities and livelihood alternatives to the destruction of forests. In addition, it is suggested to monitor the habitat and population trend.