Lauro Lopez-Mata

• Colegio de Postgraduados

La sobre explotación acelerada de los recursos naturales, la erosión de la biodiversidad en todas sus escalas, la alta demanda de alimentos, el crecimiento poblacional, el actual cambio climático y la crisis en materia de seguridad alimentaria, demandan la generación y aplicación del conocimiento botánico en todos los niveles de organización. La gr...

Los vehículos aéreos no tripulados (VANT) conocidos comúnmente como drones, son el resultado de la tecnología aeronáutica y robótica

Antecedentes: Oaxaca es una región mexicana con alta riqueza de pinos. Sin embargo, la ubicación concreta donde esta se presenta y la influencia del ambiente sobre la misma es deficiente. Preguntas: ¿Dónde se ubica la mayor riqueza, diversidad y endemismo de especies de Pinus en Oaxaca?, ¿Cómo influye el ambiente sobre la riqueza, diversidad y end...

Identifying centers of diversification is useful for species germplasm conservation planning. The study objective was to determine the localities that acted as centers of diversification of the Pinus genus in Mexico and to identify current areas with the highest pine species richness. An occurrence database (BDO) and fossil records (RF) were built...

Los patrones de la estructura de la vegetación (PEV) son afectados por la interacción dinámica entre los elementos sociales y ecológicos. El objetivo fue describir los patrones de la estructura y diversidad de la selva mediana subperennifolia después del aprovechamiento forestal maderable en Noh Bec, Quintana Roo, México. Se llevó a cabo un muestre...

Antecedentes y Objetivos: El género Ephedra incluye aproximadamente 50 especies distribuidas en zonas semiáridas del mundo. En México se encuentran ocho: Ephedra antisyphilitica, E. aspera, E. californica, E. compacta, E. nevadensis, E. pedunculata, E. torreyana y E. trifurca. La falta de información detallada de la morfología del polen de las espe...

Antecedentes: Asumiendo que las estructuras poblacionales de Abies religiosa reflejan patrones de uso, aprovechamiento, extracción y manejo, se analizó su estructura y algunos parámetros demográficos, en poblaciones sujetas a perturbaciones antropogénicas. Hipótesis y/o preguntas: ¿Cuál es el efecto de la extracción selectiva de árboles sobre la e...

Background Habitat loss and fragmentation in the Sierra Madre Oriental (SMO) ecological corridor have negative impacts on the movement and distribution of mammalian species that are of great ecological and evolutionary importance. Part of the SMO ecological corridor that is located in the state of Hidalgo is less studied despite being a potential d...

Background and Research Aims Dicksonia navarrensis is a species of tree fern at risk of extinction, distributed in the montane cloud forest (MCF) of the Americas from the central region of Mexico to Ecuador. In Mexico, populations of this species grow in primary vegetation of the MCF, in a matrix with a high degree of fragmentation and under threat...

Antecedentes: Los factores físicos y biológicos involucrados en la supervivencia y riesgos de mortalidad de plántulas, son importantes para comprender los procesos naturales asociados con su establecimiento en un contexto espacio-temporal. Objetivos: Identificar qué factores ambientales definen el nicho de regeneración de Abies religiosa con base...

Dioon holmgrenii De Luca, Sabato et Vázq.Torres is an endangered species; it is endemic and its distribution is restricted to the biogeographic province of the Mexican Pacific Coast. The aim of this work was to determine the diversity and genetic structure of nine populations. The genetic diversity parameters and Wright’s F statistics were determin...

The aims of this study were to evaluate the cambial activity and phenology of three species with different life forms (Alchemilla procumbens, Acaena elongata and Ribes ciliatum) along an altitudinal gradient and to establish which environmental variables (light, soil humidity and temperature) had the greatest influence on cambial activity and pheno...

We analyze the effects on seedling survival of Bursera bipinnata, B. copallifera and B. glabrifolia caused by their association with rocks, nurse plants, and in open areas. We hypothesize that the seedling-rock association is the safest for the establishment of all three seedling species. The objective was to investigate the suitability of the asso...

Magnolia rzedowskiana is a newly described species, with few relict populations, of low density and endemic to the cloud forest of the Sierra Madre Oriental, Mexico. In order to determine their morphological variation in their distribution area, 40 individuals from four locations were selected. In each tree, 5 flowers and 10 leaves were collected t...

Fir (Abies Mill.) forests of Mexico are relicts of the boreal forests that advanced southwards during glaciation periods. Mexico is a center of diversification of the Abies genus, as there are eight species in its territory, six of which are endemic. The forests of Abies religiosa (Kunth) Schltdl. & Cham. near Mexico City are subject to a process o...

Antecedentes: Xilema y floema secundarios son derivados del cambium vascular y su dinámica (cribo-xilogénesis) se ha estudiado en coníferas y dicotiledóneas que crecen en un mismo sitio. Estudios que evalúen la cribo-xilogénesis en especies de amplia distribución altitudinal y con diferentes formas de vida son escasos. Pregunta: ¿existen diferenci...

The American tree fern Dicksonia sellowiana reaches its northern distribution limit in Mexico. This species grows only in the highly fragmented remnants of the montane cloud forest (MCF). Given the lack of data on ecological aspects of this endangered tree fern species, considered under special protection by Mexican legislation, the objectives of t...

Lista de revisores de la revista ECOSISTEMAS durante el bienio Lista de revisores que han completado revisiones durante el bienio 2019-2020. La labor de los revisores es fundamental para que una publicación científica realice su actividad de manera adecuada y cumpla con sus objetivos de calidad. Todos estos investigadores contribuyeron generosament...

Growth-ringanalysisisavaluablesourceof informationforreconstructingenvironmentalhistory. In this study, ring-width series of a sample of Fagus grandifolia subsp. mexicana were used to identify the main events that have affected populations of this species. Core samples were extracted in three representativebeechforestsinMexico.TheseareforestswhereF...

Change in environmental conditions with altitudinal gradients induces morpho-anatomical variations in plants that have been poorly documented in intertropical regions. Five species with three life forms, cryptophyte (Alchemilla procumbens, Geranium seemannii), hemicryptophyte (Acaena elongata, Lupinus montanus), and phanerophyte (Symphoricarpos mic...

The morphological variation among 11 populations belonging to two endemic congener species of Neobuxbaumia, columnar cacti, was studied. One of our hypotheses was that N. mezcalaensis (Bravo) Backeb. with widespread distribution would show a higher variation of morphological characters and geographic–environmental variables compared with N. multiar...

Cascabela is a Neotropical genus of Apocynaceae with six species: C. balsaensis, C. gaumeri, C. ovata, C. pinifolia, C. thevetia and C. thevetioides. Its taxonomic history has long been a subject of controversy, especially due to its circumscription as a genus closely related to Thevetia. In this work, we revised the taxonomy of Cascabela for Mexic...

The composition, richness and distribution of fern and lycophyte species were studied in the three largest and most intact stands of the beech Fagus grandifolia subsp. mexicana in Mexico, located in the Sierra Madre Oriental (SMO) in the state of Hidalgo. During fieldwork, specimens were collected in these stands, and five 60 m² sampling plots were...

La Sierra Madre Oriental ha perdido hasta el 30% de su vegetación, lo que hace imperativo conocer mejor su biodiversidad, así como las variables ambientales que explican su distribución. En la Sierra Madre Oriental es posible diferenciar 4 regiones climáticas, pero nunca se ha evaluado su relación con la biodiversidad. Se propone una evaluación con...

The relationship between the richness, diversity and distribution of fern and lycophyte species and some climatic and soil variables in the mountain cloud forest of the municipality of Tlanchinol, Hidalgo, Mexico, was analyzed. Twenty-four sampling plots of 400 m2 each were established in three elevational ranges between 1,107 and 1,903 m. In each...

The highest densities and largest areas of Fagus grandifolia subsp. mexicana in Mexico grow in the cloud forest of the state of Hidalgo. Although this taxon is endangered, there is little information about its population structure. This study provides data on the structure of heights, diameters and ages of Fagus in three populations in Hidalgo. Add...

Michoacán is the fifth state with the greatest diversity of plant species, excelling due to its richness in families, genera and species of flowering trees in Mexico. Therefore, in this paper the potential distribution of 12 species of Pinaceae was evaluated in current conditions and future climate change scenarios through ecological niche models....

El objetivo de este trabajo fue conocer la estructura, heterogeneidad de estadios y el patrón de dispersión espacial de diez poblaciones de Dioon holmgrenii De Luca, Sabato & Vázq. Torres, especie en peligro de extinción y endémica al sur de Oaxaca, con fines de conservación. Se establecieron once y nueve unidades de muestreo en sitios sin cambio a...

El modelado de la distribución de especies sinantrópicas (malezas) y los factores ambientales que determinan dicha distribución han sido poco estudiados. Physalis tiene 90 especies distribuidas en las Américas, y algunas especies en el Viejo Mundo. México alberga cerca de 70 especies y aproximadamente 35 son endémicas. La sección Angulatae incluye...

Background and aims – Ecological niche conservatism describes the tendency of phylogenetically related species to maintain the characteristics of their ancestral fundamental niches. Our aim was to assess niche conservatism of species belonging to two plant genera of the Family Asteraceae endemic to Mexico: Dyscritothamnus includes two woody species...

Abies hickelii is an endangered fir species, restricted to Chiapas, Oaxaca and Veracruz, Mexico; on the ear of Orizaba Mountain, Veracruz, its area of distribution is used for grazing and logging. Stands of A. hickelii protect the upper Jamapa River basin in Veracruz. In order to assess whether the species is in danger we performed a quantitative d...

En México los sistemas de áreas protegidas no dan respuestas a las demandas de conservación de la biodiversidad. Se necesita evaluar la eficiencia de las ya establecidas y emplear algoritmos adecuados que informen cómo seleccionar sitios adicionales para conservar la mayor biodiversidad. El uso de algoritmos metaheurísticos, como los implementados...

The species distribution along altitudinal gradients is associated with climate changes, promoting changes in the morphology and anatomy of the species. In this study, the morpho-anatomical changes of leaf and wood of Ribes ciliatum (Grossulariaceae) were evaluated along an altitudinal gradient in Tlaloc Mount, at the northern region of Sierra Neva...

The species distribution along altitudinal gradients is associated with climate changes, promoting changes in the morphology and anatomy of the species. In this study, the morpho-anatomical changes of leaf and wood of Ribes ciliatum (Grossulariaceae) were evaluated along an altitudinal gradient in Tlaloc Mount, at the northern region of Sierra Neva...

p> <!--[if gte mso 9]> El propósito de esta investigación fue obtener un listado de las plantas utilizadas por los antiguos habitantes de Teotihuacan prehispánico, a partir de la interpretación botánica y etnobotánica de registros arqueobotánicos e iconográficos. El registro resultante de plantas útiles para la cultura teotihuacana comprende 77...

The purpose of the research reported here was to develop a list of plants utilized by the ancient inhabitants of prehispanic Teotihuacan through the botanical and ethnobotanical interpretation of archaeobotanical and iconographic records. The resulting register of useful plants is comprised of 77 taxa, based on published studies and archaeological...

ABSTRACT Temazate (Mazama temama), is a deer with uncontrolled historical hunting use in México. Due to this situation and to demographic factors, the International Union for the Conservation of Nature and the NOM-059-SEMARNAT-2010 place it into the categories of “In Danger” and “Threatened”, respectively. In the study of populations it is importan...

The structure and tree diversity of traditional coffee agroecosystems was studied in a Popoluca community within the Biological Reserve of Los Tuxtlas, Veracruz, Mexico, along an altitudinal gradient from 450 to 1000masl. The coffee agroecosystems were established in three physiognomic units: tropical semi-deciduous forest, tropical rain forest and...

A ntes de realizar el modelado de la distribución potencial de una especie, se recomienda ha - cer una preselección de covariables pues la redundancia o variables irrelevantes pueden in - ducir sesgos en la mayoría de los modelos. En este estudio, se propuso un método automati - zado para la selección a priori de covariables utilizadas en el modela...

Prior to modeling the potential distribution of a species it is recommended to carry out analyses to reduce errors in the model, especially those caused by the spatial autocorrelation of presence data or the multi-collinearity of the environmental predictors used. This paper proposes statistical methods to solve drawbacks frequently disregarded whe...

In many fields of biology, information on species richness and geographic distribution is essential for decision-making. However, Mexico as many other countries does not has this information at national level; therefore we consider important to generate information about of the distribution of species richness both known and estimated at national l...

Se estudió el proceso germinativo de tres especies de Cephalocereus (C. apicicephalium, C. nizandensis, C. totolapensis) endémicas del Itsmo de Tehuantepec, Oaxaca, México, bajo las hipótesis de que las semillas perderán la capacidad germinativa a medida que pasen los días después de la recolección y que la germinación es diferente entre especies,...

Pinus maximartinezii is a rare, endemic, threatened species known from a single small population in the state of Zacatecas, Mexico. Among the pine species that produce edible nuts, it produces one of the largest and most nutritious seeds. The seeds of P. maximartinezii have historically been used for human consumption. The cones are harvested direc...

The interactions between the fruit fly Anastrepha spatulata Stone (Diptera: Tephritidae) and two species of moths, the gelechiid Coleotechnites sp. and an unidentified tortricid species, were examined on their effects on seed production in terms of their exploitation within fruits of Schoepfia schreberi J.F. Gmel (Santalales: Olacaceae). The study...

Hylocereus (Berger) Britton y Rose es una cactácea con elevado potencial económico. Se distribuye en climas tropicales, subtropicales y semiáridos. El número de especies reconocidas para México es controvertido, debido a que no existe un consenso en cuanto a su taxonomía, principalmente por la amplia variación morfológica que se observa en las estr...

Hylocereus (Berger) Britton and Rose is a cacti with high economic potential. It is distributed in tropical, subtropical and semi-arid environments. The number of species identified in Mexico has been controversial, mainly because of the wide morphological variation observed on their vegetative structures. Three chloroplast regions (matK, rbcL, psb...

We studied the germination process of three species of Cephalocereus (C. apicicephalium, C. nizandensis, C. totolapensis) endemic to the Isthmus of Tehuantepec, Oaxaca, Mexico under the hypotheses that seeds lose their germination capacity as the days go after harvesting and the germination is different between species but not between collecting si...

El conocimiento sobre la riqueza y distribución de las especies de helechos y licopodios en el estado de Hidalgo, es escaso por lo que el objetivo principal de esta investigación fue realizar un inventario de las especies de Pteridofitas, conocer sus patrones de abundancia y los sustratos de crecimiento en el bosque mesófilo de montaña del municipi...

El Bosque Húmedo de Montaña es uno de los biomas más importantes de México, pues allí se encuentra una gran riqueza florística y de endemismos, restringida a una pequeña extensión geográfica. Hasta la fecha no se sabe a ciencia cierta la extensión real de este bioma en el país; por tal razón, el objetivo de este trabajo es delimitar su distribución...

The humid mountain forest also known as cloud forest or bosque mesofilo de montana, is defined and delimited by the persistent occurrence of clouds and fog, which in addition to rain capture water drops that condensate over vegetation. It is well known that atmospheric humidity is the main factor promoting its persistence and distribution all over...

The knowledge on the species richness and distribution of Pteridophytes in the state of Hidalgo is scarce, so that the objective of this research was to carry out an inventory of Pteridophytes to get insights on its patterns of abundance and substrates of growth in the cloud forest of Tlanchinol, Hidalgo. The floristic study was based on an exhaust...

El bosque humedo de montana, tambien conocido como bosque mesofilo de montana o cloud forest, esta definido y limitado por la presencia persistente de nubes y neblina que, ademas de la lluvia, capturan las gotas de agua que se condensan sobre la vegetacion. Se reconoce ampliamente que la humedad atmosferica es el principal factor ambiental que prom...

The morphological characteristics of fruits and seeds, and the germination responses of freshly matured seeds of five species of Cacteae (Coryphantha bumamma, C. clavata, C. cornifera, Ferocactus histrix and Mammillaria uncinata) were studied at room temperature under laboratory conditions. The aim of the study was to record the macro- and micro-mo...

Humid Mountain Forest is one of the most important Mexican biomes due to the high floristic richness and endemism found within its small geographical extension. The distribution of this biome is not well known in the country; accordingly, the goal of this paper is to delimit its distribution by using potential distribution models of species charact...

We examined rock soil plant relationships of three endemic Cactaceae species [Cephalocereus apicicephalium E.Y. Dawson, C nizandensis (Bravo & T. MacDoug.) Buxb., and C. totolapensis (Bravo & T. MacDoug.) Buxb.] from the tropical deciduous forest of the Tehuantepec River basin, Mexico. The goal was to explain the relationships between the species,...

Neobuxbaumia multiareolata and N. mezcalaensis are taxa poorly defined, despite the second species was described originally as a variety of first. Although several classification proposals indicate that they represent different species, in the most recent cacti classification, both are considered a single species. The working hypothesis is that the...

Neobuxbaumia mezcalaensis y N. multiareolata son taxones pobremente defi nidos, donde la segunda especie fue descrita originalmente como variedad de la primera. Aunque varias propuestas de clasifi cación señalan que son especies independientes, existe aún controversia sobre su estatus taxonómico. Nuestra hipótesis de trabajo es que existen caracter...

In this work the variability in seedling morphology of one of the most abundant neotropical trees, Manilkara zapota, is described. These seedlings display morphological changes significantly related with their survival probabilities. The variation is described from observations of 552 seedlings with heights less than 35 cm, in a subtropical rain fo...

In this work the variability in seedling morphology of one of the most abundant neotropical trees, Manilkara zapota, is described. These seedlings display morphological changes significantly related with their survival probabilities. The variation is described from observations of 552 seedlings with heights less than 35 cm, in a subtropical rain fo...

A close relationship between leafing, flowering, fruiting and radial growth has been conjectured to occur in tropical and subtropical rainforest trees. Radial stem growth, in particular, has been associated with the activity of the two secondary meristems, the vascular cambium and, to a lesser degree, the phellogen. In tropical trees vascular cambi...

We studied wood and bark anatomy of six (Deppea, Hamelia, Hoffman-nia, Omiltemia, Pinarophyllon, and Plocaniophyllon) of the seven genera of the tribe Hamelieae sensu Robbrecht, and Syringantha with as main purposes to determine if there are characters that support the boundaries of the Hamelieae, to evaluate the status of Syringantha as a member o...

The survival of a cohort of Abies religiosa seedlings was investigated during eight years in an intact forest (NAF) and forest patches affected by: shallow fires (SUPAF), intermediate canopy fires (ICAF), and full canopy fires (FCAF). The objective of this paper was to provide a better understanding on the natural regeneration processes of A. relig...

Se investigó la supervivencia de una cohorte de plántulas de Abies religiosa durante ocho años, en parches de bosque no afectados (BNA) y afectados por incendios: superficiales (BICSUP), de copa moderados (BICMOD) y de copa severos (BICSEV). El objetivo fue aportar mayor entendimiento sobre los procesos de regeneración natural de Abies religiosa. E...

An analysis of the vegetation and the physical factors associated with their structure and distribution along an elevation gradient from 2750 to 4100 m was conducted in the north of Sierra Nevada, Mexico. Based on field physiog-

c1 Corresponding author. Current address: Departamento de Botánica, Instituto de Biología, UNAM, Tercer Circuito Externo s/n, Ciudad Universitaria, Coyoacán, México, D.F. 04510, México. Emails: lauro@colpos.mx and laurolopezmata@gmail.com

Theory and empirical data suggest the areas of origin of a crop to be the general area of origin of its coevolved weeds. These longer evolved weeds would have an advantage over species with a shorter evolutionary time and migrate more successfully. We seek to identify patterns by comparing two regions with a shared crop, similar physiographic trait...

Wood anatomy of the genus Buddleja was studied to gain insight about its relationship with habit and latitude. Habit was positively associated with most characteristics, showing the highest correlation coefficients with vessel element length and fibre length. Four features were negatively correlated with latitude, confirming observations for other...

Morphological seed traits and germination responses of freshly matured seeds of six species of Pachycereeae: Escontria chiotilla, Myrtillocactus geometrizans, Neobuxbaumia mezcalaensis, N. multiareolata, Pachycereus grandis, and Stenocereus queretaroensis were studied at room temperature in laboratory conditions with the hypothesis that seed size a...

Se estudió la anatomía de la madera del género Buddleja para tener una perspectiva de su relación con el hábito y con la latitud. El hábito se asoció positivamente con la mayoría de los caracteres de la madera y mostró los coeficientes de correlación más altos con la longitud de los elementos de vaso y de las fibras. Cuatro caracteres se correlacio...

Fagus grandifolia subsp. mexicana es una especie restringida a pequeñas poblaciones y sujeta a fuerte presión antropogénica. Con el objetivo de obtener información relevante que permita proponer alternativas de conservación, se analizó la producción de semillas y la demografía de plántulas de primer año en la Mojonera, Hidalgo. Se estableció una pa...

Seed morphology of nine species of Neobuxbaumia and Carnegiea gigantea was examined by scanning electronic microscopy to distinguish their similarities and differences. Fourteen quantitative and qualitative features were evaluated to identify groups of species using a phenetic analysis. Two groups were recognized based on seed shape and rim positio...

Seed morphology of nine species of Neobuxbaumia and Carnegiea gigantea was examined by scanning electronic microscopy to distinguish their similarities and differences. Fourteen quantitative and qualitative features were evaluated to identify groups of species using a phenetic analysis. Two groups were recognized based on seed shape and rim positio...

Fagus grandifolia subsp. mexicana is a species restricted to small populations under high anthropogenic pressure. With the aim to attain information to propose conservation strategies of this species, the seed rain and demography of current-year seedlings were analyzed at La Mojonera, Hidalgo, Mexico. A 4 800 m 2 plot divided into 10 X 10 m quadran...

Fagus grandifolia subsp. mexicana es una especie restringida a pequeñas poblaciones y sujeta a fuerte presión antropogénica. Con el objetivo de obtener información relevante que permita proponer alternativas de conservación, se analizó la producción de semillas y la demografía de plántulas de primer año en la Mojonera, Hidalgo. Se estableció una pa...

Fagus grandifolia subsp. mexicana is a species restricted to small populations under high anthropogenic pressure. With the aim to attain information to propose conservation strategies of this species, the seed rain and demography of current-year seedlings were analyzed at La Mojonera, Hidalgo, Mexico. A 4 800 m2 plot divided into 10 X 10 m quadrant...

The geophytoelectrical current of three evergreen tropical tree species is studied as an indirect measure of their relative water content. Two intermediate shade-tolerant species (Aphananthe monoica and Pleuranthodendron lindenii), distributed in the middle and upper canopy strata, and an understory shade-tolerant species (Psychotria costivenia) we...

The genus Persea consists of two subgenera, Persea (known as avocados) and Eriodaphne (known as aguacatillos, avocado-like species). The present study aimed to determine whether the genus Persea is a monophyletic group and whether the division into two subgenera is an artificial one. In conjunction with these goals, a hypothesis of the phylogenetic...

Resumen: Se analizó la composición y la distribución de las familias, los géneros y las especies de plantas vasculares del bosque de oyamel del Cerro Tláloc en el norte de la Sierra Nevada. En un intervalo altitudinal de 3,000 a 3,500 m se exploró el bosque maduro de oyamel para recolectar el mayor número posible de especímenes durante 16 meses con...

We analyzed the degree of association of the birds species richness and diversity and the vegetation structure (richness and diversity of species and height); these attributes were quantifi ed respectively with 12 points of count (4/area) and with point centred quarter method (40/area) in 3 areas with different degrees of succession. The species di...

We analyzed the degree of association of the birds species richness and diversity and the vegetation structure (richness and diversity of species and height); these attributes were quantifi ed respectively with 12 points of count (4/area) and with point centred quarter method (40/area) in 3 areas with different degrees of succession. The species di...

The subgenus Lobadium of the genus Rhus contains about 25 species, distributed mainly in Mexico. The geographic distribution of these species was analyzed through a panbiogeographic approach, based on a parsimony analysis of endemicity. Distribution of subgenus Lobadium lies principally in the Mexican Transition Zone, constituting a Nearctic elemen...

One of the problems analysing cause-effect relationships of growth and environmental factors is that a single factor could be correlated with other ones directly influencing growth. One attempt to understand tropical trees' growth cause-effect relationships is integrating research about anatomical, physiological and environmental factors that influ...

Buddleja cordata is an evergreen species of wide distribution in Mexico that is represented by shrubs and trees. Wood variability of B. cordata was evaluated in relation to plant size as well as latitude, altitude, soils, and climatic data. Canonical correlation analysis (CCA) showed that two canonical correlations are significant (Wilks' λ, p<0.00...

Buddleja cordata is an evergreen species of wide distribution in Mexico that is represented by shrubs and trees. Wood variability of B. cordata was evaluated in relation to plant size as well as latitude, altitude, soils, and climatic data. Canonical correlation analysis (CCA) showed that two canonical correlations are significant (Wilks' λ, p<0.00...

Characteristics developed by Cactaceae for adaptation to climates where water is limited include crassulacean acid metabolism (CAM), a thick cuticle, and spines and trichomes that intercept a proportion of solar radiation. A few studies consider morpho-anatomical and physiological characteristics of Cactaceae seedlings, which may help understand th...

The purpose of this work was to compare the population structure and some demographic parameters of Juniperus flaccida between two populations in order to contribute for a better understanding of the management practices, as well as the use and conservation of this species. Two permanent plots of1ha each one were settled down under different pertur...

En este estudio se combinaron sitios de conteo, captura de individuos y recorridos aleatorios para el registro de especies de aves en tres áreas de muestreo: potrero, selva con regeneración intermedia y selva madura. En cada área así como para toda la zona de estudio se determinó la riqueza de especies verdadera (especies registradas dentro y fuera...

El subgénero Lobadium del género Rhus posee alrededor de 25 especies, que se distribuyen principalmente en México. Se analizó la distribución geográfica de estas especies aplicando un enfoque panbiogeográfico, a partir de un análisis de parsimonia de endemismos. La distribución del subgénero Lobadium se encuentra principalmente en la Zona de Transi...

This article presents an analysis of plant species richness and diversity and its association with climatic and soil variables along a 1300-m elevation gradient on the Cerro Tláloc Mountain in the northern Sierra Nevada in Mexico. Two 1000-m2 tree sampling plots were created at each of 21 selected sampling sites, as well as two 250-m2 plots for shr...

Se registran la riqueza y diversidad de especies de aves en tres áreas distintas (pastizal ganadero, selva con regeneración y selva madura) en una selva mediana subperennifolia del Centro de Veracruz. Se registraron 171 especies, el 45% son abundantes, el 23% escasas y el 32% raras. Del total de especies registradas 112 son residentes y 59 migrator...

The similarity in composition of families, genera, and species of vascular plants was analyzed from existing published data belonging to 12 localities of fir forests located on the transmexican volcanic belt. The similarity analyses were performed using classification and ordination multivariate statistical techniques. The vascular flora of these f...

Se analizó la semejanza en la composición de familias, géneros y especies de plantas vasculares de los bosques de oyamel de la Faja Volcánica Transmexicana, los datos se obtuvieron a partir de la revisión bibliográfica en 12 localidades. Con esta información se estimó la semejanza florística entre los sitios mediante métodos de clasificación y orde...

La variación en el tamaño de la semilla juega un papel importante en los procesos de germinación y establecimiento de plántulas. La germinación en cuatro fechas de siembra de cinco categorías de peso de semilla de Stenocereus beneckei se evaluó con la finalidad de inferir las estrategias de supervivencia en las primeras fases de su ciclo de vida. S...