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Ecología Aplicada

Print version ISSN 1726-2216

Abstract

IBARRA-DIAZ VELARDE, Irma et al. Fundamental niche model of Coryphantha chihuahuensis (cactaceae) in the state of Chihuahua, México. Ecol. apl. [online]. 2016, vol.15, n.1, pp.11-17. ISSN 1726-2216.

The Cactaceae family is distinguished by its morphology and anatomy that allows it to withstand prolonged periods of drought and high solar radiation. For some of its species there is a lack of basic information regarding distribution, status and fundamental niche. This is the case of Coryphantha chihuahuensis, reported in the Chihuahua state in the Chihuahuan Desert region. The aim of this study was to determine the fundamental niche of Coryphantha chihuahuensis in the state of Chihuahua, displaying possible and suitable areas in which the species could develop. During fieldwork 20 georeferenced sites with species occurrence were recorded. The species fundamental niche was determined using three models with different combinations of variables (bioclimatic variables, altitude, soil, land use and vegetation). The algorithm used was MaxEnt (maximum entropy). The results indicate that the model with the lowest error was the model that contained all variables, with an effectiveness value of 99% and a standard deviation of 0.001. The model places the fundamental niche of the species in the center and south of the state, with a probability of occurrence of 70 to 100% at the center; while the lowest values were south-central and northeast of the state with the probability of presence of 30 to 50%. The obtained model used to determine the fundamental niche for C. Chihuahua is timely as it shows probable and appropriate areas for the species. This will help in the protection, conservation and recovery of the species.

Keywords : maximum entropy; occurrence localities; endemic; georeference; environmental variables; fundamental niche.

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