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Browsing by Subject "Tehuacan Valley"

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demographic analysis of a rare columnar cactus (neobuxbaumia macrocephala) in the tehuacan valley, mexico

Esparza-Olguin, L; Vilchis-Anaya, E; Valverde, MT (2002)

In this study we used population projection matrices to evaluate the conservation status of Neobuxbaumia macrocephala, a columnar cactus endemic to a small region in the Tehuacan Valley, in central Mexico. Demographic data ...
evaluation of the conservation status of a rare cactus (mammillaria crucigera) through the analysis of its population dynamics

Contreras, C; Valverde, MT (2002)

We used population projection matrices to analyse the demography of Mammillaria crucigera, a rare cactus endemic to a small region in Central Mexico. Matrices were based on a 2-year period of observations on survival, ...
habitat preference of the epiphyte tillandsia recurvata (bromeliaceae) in a semi-desert environment in central mexico

Bernal, R; Hernández-Rosas, L; Valverde, MT (2005)

Tillandsia recurvata L. is an atmospheric epiphyte that occupies tree canopies in many parts of tropical America. We investigated the host preferences of this species by analyzing its occurrence on trees in a 1-ha plot in ...
Species-specific disturbance tolerance, competition and positive interactions along an anthropogenic disturbance gradient

Villarreal-Barajas, T; Martorell-Delgado, Carlos (2009)

Question As it has been found that stress promotes positive interactions mediated by physical amelioration of the environment, is it possible that interactions may turn positive with increasing chronic anthropogenic ...

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