Notes on scutellation, length, and distribution of rattlesnakes (serpentes: viperidade: crotalus) in the state of hidalgo, México.

We studied the eight species of Crotalus inhabiting the Mexican state of Hidalgo and found additional variation involving number of scales, body length, and distribution previously unreported in the literature. Supplementary morphological variation is reported for C. aquilus and C. atrox, and new distributional records are reported for C. aquilus, C. atrox, C. intermedius, C. scutulatus, and C. totonacusEstudiamos las ocho especies del género Crotalus distribuidas en el estado de Hidalgo y encontramos variación adicional a la registrada en la literatura. C. aquilus y C. atrox registran variación morfológica, mientras que se registran nuevos datos de distribución para C. aquilus, C. atrox C. intermedius, C. scutulatus, y C. totonacus

Pega-ropa (Mentzelia Hispida: Loasaceae), una planta que atrapa murciélagos

The goal of this contribution is to inform for the first time, about bats that are trapped for blazingstar plants (Mentzelia hispida: Loasaceae). These plants are covered totally with hispid trichomes. The tip of the trichomes finishes in four recurved thorns, capable of embeding and fastening in the nude bat skin and impede to be freed of them, adhering it tightly. The observations were carried out while we studied the population dynamics of Leptonycteris yerbabuenae in the cave of Guano, located in the immediacies of San Pablo Tetlapayac, Municipality of Metztitlan, Hidalgo, Mexico, at the Biosphere Reservation of Barranca de Metztitlán (Metztitlan Canyon). During two consecutive years we found bats of the species Pteronotus personatus, Natalus stramineus, and Leptonycteris yerbabuenae trapped by blazingstar plants, without apparent possibilities to be freed, for which this circumstance was considered fatal for bats. Other bats of the species Mormoops megalophylla, Pteronotus parnelli, Pteronotus davyi, Leptonycteris nivalis, and Glossophaga soricina would be running the same danger, due to plant grows in the immediacies of the entrance of the cave where they take refuge.

Ciencia Odontológica 2.0

Libro que muestra avances de la Investigación Odontológica en MéxicoEs para los integrantes de la Red de Investigación en Estomatología (RIE) una enorme alegría presentar el segundo de una serie de 6 libros sobre casos clínicos, revisiones de la literatura e investigaciones. La RIE está integrada por cuerpos académicos de la UAEH, UAEM, UAC y UdeG

Equivalence and similarity.

<p>Equivalence and similarity.</p

Distribution of <i>Lithobates catesbeianus</i> native and invaded ranges.

<p>The black dots indicate the native distribution of <i>L</i>. <i>catesbeianus</i> in the United States. The dots in yellow, blue, red and green represent the invaded distribution of bullfrogs in Mexico.</p

Evidence of niche shift and invasion potential of <i>Lithobates catesbeianus</i> in the habitat of Mexican endemic frogs

<div><p>Invasive alien species are one of most severe threats to biodiversity and natural resources. These biological invasions have been studied from the niche conservatism and niche shifts perspective. Niche differentiation may result from changes in fundamental niche or realized niche or both; in biological invasions, niche differences between native and non-native ranges can appear through niche expansion, niche unfilling and niche stability. The American bullfrog <i>Lithobates catesbeianus</i> is an invasive species that can have negative impacts on native amphibian populations. This research examines the climate niche shifts of this frog, its potential range of expansion in Mexico and the risk of invasion by bullfrog in the habitats of 82 frog species endemic to Mexico, that based on their climatic niche similarity were divided in four ecological groups. The results indicate that species in two ecological groups were the most vulnerable to invasion by bullfrog. However, the climate niche shifts of <i>L</i>. <i>catesbeianus</i> may allow it to adapt to new environmental conditions, so species from the two remaining groups cannot be dismissed as not vulnerable. This information is valuable for decision making in prioritizing areas for conservation of Mexican endemic frogs.</p></div

Model of habitat suitability of <i>L</i>. <i>catesbeianus</i>.

<p>Analysis under current climatic conditions. Habitat suitability is measured in an ascending scale from 0 to 1, where 0 is low habitat suitability and 1 is high suitability.</p

Principal component analysis.

<p>The gray dots represent the multivariate climatic space of the distribution of <i>L</i>. <i>catesbeianus</i> in the United States and Mexico. The yellow dots indicate the distribution of bullfrogs in climate space of native range, dark blue dots shows the distribution of this frog in climate space of Zone A (Sonora and Chihuahua), red dots in Zone B (Baja California Sur), green dots in Zone C (Sinaloa) and brown dots in Zone D (Veracruz, Hidalgo, Michoacán and Morelos).</p