Knowledge of the population dynamics of tropical trees has expanded considerably in the past 20 years. An important observation deriving from these investigations is the confirmation that population behaviour varies both in time and space. A tool recently developed to…

Tillandsia magnispica Espejo & López-Ferrari, known only from the state of Oaxaca, Mexico, in the municipalities of San Pedro el Alto and San Pedro Pochutla, is described and illustrated. The new taxon is compared with T. jaliscomonticola Matuda, a morphologically…

The name Didymaea alsinoides (Schltdl. & Cham.) Standl. has been incorrectly applied to a common and wide-ranging Mexican and Central American species whose correct identity is Didymaea Mexicana Hook. f. In this paper a lectotype is selected and designated for…

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Genetic testing for mutations in BRCA1 and BRCA2 has potentially important public health implications. Through judicious testing of women believed to be at high risk for early-onset breast cancer and for ovarian cancer, it is possible to identify highly-predisposed women…

A comparative study of the gametophytes of eight Mexican species of the genus Blechnum (Blechnaceae) is described. Fertile plants for spore collection were obtained at different Mexican localities. The spores were sown in agar enriched with Thompson media and cultured…

We estimate the required time and the minimum necessary growth rate to halve poverty incidence and poverty intensity in Mexico's rural and urban areas for a series of counterfactual distribution and growth scenarios. Results show that, given the current income…

A second review of the 13 Mexican species in the Frankliniella paricutinensis Johansen species assemblage is presented, including the description of a new species. It was sampled from the onion Allium cepa L. agro-ecosystem, in 2 different localities in southern…

A lungworm of the genus Rhabdias (Nematoda: Rhabdiasidae) was recovered from Scinax staufferi (Anura: Hylidae) collected in Guadalupe Victoria Mapastepec, Chiapas, Mexico (15°28'28"N, 92°53'26"W, 102 m). Morphology of the nematode is briefly described and compared with other species of the…

The purpose of this article is to examine the institutionalization of a region of the United States of America: the Texas Lower Rio Grande Valley. It will use and build on theories of regional institutionalization, geography, and demography by Paasi,…