Exploring in the Quebrada del Rio Piaxtla

Etter, Julia; Kristen, Martin

doi:10.2985/0007-9367-85.1.4

Cited by 2 publications

(1 citation statement)

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“…In addition, given the difficult access to this region, the records included in the data matrix are relatively few (31); furthermore, 13 of the 17 species are represented by a single record, that is, they appear as singletons in the analysis, raising as such the value of estimated richness in that particular cell. Etter and Kristen (2013), in an exploration with particular interest in succulent plants carried out in this area, mention several cacti species, only one different to the 17 registered here for the cell 39, raising to 18 the known richness of that area; less than a third of the estimated richness. The overestimation of richness in that cell is an example of the inaccuracies that result from the combination of a small sample and a heterogeneous environment.…”

Section: Inventory Completenessmentioning

confidence: 99%

Updated checklist and conservation status of Cactaceae in the state of Durango, Mexico

et al. 2017

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An updated and annotated checklist of Cactaceae in the Mexican state of Durango is provided, supported by a thorough examination of specialized literature and herbarium specimens, as well as field work. Additionally, geographical distribution, endemism and conservation status of the species were analyzed based on a compiled data matrix with 2326 georeferenced records. Cactaceae comprises 137 species and 29 genera in Durango, which represent a high proportion of the Mexican cactus flora: 46−58% at the generic level and 20−23% at the specific level. The estimated richness according to Chao-2 and Jackknife-1 is 143 and 151 species respectively, which means that the inventory we present here for the Cactaceae of Durango is complete in 91 to 96%. Since no herbarium specimens nor registers in reliable data bases were found to support their presence in the area, 46 taxa were excluded; even so, this inventory increases by 30% the cacti richness previously reported for Durango and provides new information on the distribution range of many species. The richest genera are Mammillaria, Opuntia, Coryphantha and Echinocereus. The highest concentration of species occurs in the arid and semiarid zone of eastern Durango, although there are also some spots with significant richness in the tropical region on the western slopes of the Sierra Madre Occidental. 75% of the species are endemic to Mexico, 41% are regional endemics and 5% are restricted to Durango. New records and relevant novelties are also discussed.Key words: cacti, Chihuahuan Desert, distribution, richness, Sierra Madre Occidental ResumenSe presenta una lista actualizada y comentada de las cactáceas de Durango respaldada en una revisión exhaustiva de literatura especializada, especímenes de herbario y trabajo de campo. Además, se analiza la distribución geográfica, endemismo y estatus de conservación de las especies con base en una matriz de datos con 2326 registros georreferidos. Cactaceae incluye 137 especies de 29 géneros en Durango, lo que representa una alta proporción de la flora cactológica mexicana: 46−58% de los géneros y 20−23% de las especies. La riqueza estimada según Chao-2 y Jackknife-1 es 143 y 151 especies, respectivamente, lo que significa que el inventario de Cactaceae de Durango que presentamos aquí está completo en 91 a 96%. Se excluyó un gran número de taxones (46), ya que no se encontraron especímenes de herbario, ni registros en bases de datos confiables que apoyen su presencia en el área de estudio; aun así, este inventario incrementa en 30% la riqueza de cactus registrada antes para Durango y provee información novedosa sobre los rangos de distribución de muchas especies. Los géneros más ricos son Mammillaria, Opuntia, Coryphantha y Echinocereus. La mayor concentración de especies ocurre en la región árida y semiárida del oriente de Durango, aunque también hay algunos puntos con riqueza considerable en la región tropical en la vertiente occidental de la Sierra Madre Occidental. 75% de las especies registradas son endémicas a México, 4...

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Section: Inventory Completenessmentioning

confidence: 99%