Las Escuelas Lancasterianas en La Ciudad De México:

Estrada, Dorothy Tanck de

doi:10.2307/j.ctv5137rb.7

Cited by 9 publications

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“…Available information about the current distribution of manatees ( T. m. manatus ) and some aspects of its ecology in Mexico is available only for two localities, one in the coastal state of Tabasco (southeast Gulf of Mexico) [5,12] and the other along the eastern Caribbean coast of the Yucatan peninsula [13–14]. Historically, manatees have been reported in coastal lagoons in Los Tuxtlas, Veracruz (north of Tabasco state), but these populations have been extirpated [15]. Manatee populations are reported for the Alvarado lagoon about 150km north of Los Tuxtlas [16] and there is a report of the existence of manatee population as far north as the Mexican state of Tamaulipas by the Gulf of Mexico coast [17].…”

Section: Introductionmentioning

confidence: 99%

Distribution and Conservation of the West Indian Manatee (Trichechus manatus Manatus) in the Catazajá Wetlands of Northeast Chiapas, México

Rodas-Trejo

Romero-Berny

Estrada

2008

Tropical Conservation Science

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Tropical coastal wetlands have a rich biodiversity, a restricted geographic distribution and are a prime habitat for manatees in the regions where they occur in the Neotropics. Human pressures affect the persistence of tropical wetland ecosystems and hence of manatees. In the continental Neotropics, the West Indian manatee (Trichechus manatus) is represented in Mexico by the subspecies T. m. manatus. Lack of information regarding the current distribution of manatees in Mexico hampers conservation approaches of this marine mammal. In this paper we present information on a survey of a population of manatees found in the Catazajá wetlands (ca 60,000ha) in northeast Chiapas, Mexico. We additionally report on manatee conservation efforts spanning seven years aimed at involving the participation of local rural communities. Systematic surveys for the presence of manatees were conducted between Feb-Nov, 2007 by sightings along sampling transects in waterways, recording of manatee presence as evidenced by recently browsed aquatic vegetation, presence of stranded individuals and presence of deceased manatees. Additionally, some records of manatee presence underwater were obtained by using a sidescan sonar system. Lastly, interviews with 120 individuals from 10 local communities also yielded information on manatee presence in the wetland system. A map of the study area divided into a grid of 50 ha cells was used to plot and quantify the records of manatee presence obtained with the above procedures. Results indicated presence of manatees in 11% (ca 4,850 ha) of the 50 ha cells into which the study area was divided. Records indicate presence of manatees throughout the wetland, but with concentration in particular sectors. Involvement of local communities in manatee conservation has resulted in designating the Catazajá wetlands as a natural protected area.Keywords: Trichechus manatus, West Indian manatee, wetlands, Neotropics, manatee conservation, Mexico Los humedales costeros del Neotrópico son ricos en biodiversidad, presentan una distribución geográfica restringida y son los hábitats principales para poblaciones de manatíes en las regiones en donde estos ocurren. Los humedales costeros están bajo riesgo debido a presiones humanas, impactando la persistencia de poblaciones de manatíes. En la región continental del Neotrópico, el manatí esta representado por la especie Trichechus manatus y en México por la subespecie T. m. manatus. La falta de información básica sobre la distribución actual de poblaciones de manatíes en México dificulta acciones de conservación de este mamífero marino. En este trabajo presentamos los resultados de un reconocimiento de la población de manatíes en los humedales de Catazajá (ca 60,000 ha) en la región noreste del estado de Chiapas, cercana al Golfo de México. También reportamos avances en programas de conservación de los manatíes que involucran a las comunidades locales. Entre Febrero y Noviembre del 2007 se efectuaron reconocimientos sobre presencia de manatíes en el humedal a través...

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Section: Introductionmentioning

confidence: 99%

Distribution and Conservation of the West Indian Manatee (Trichechus manatus Manatus) in the Catazajá Wetlands of Northeast Chiapas, México

Rodas-Trejo

Romero-Berny

Estrada

2008

Tropical Conservation Science

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“…En el recién creado imperio mexicano se conformó la Compañía lancasteriana, dedicada a promover este método educativo 66 . A diferencia de Colombia, el interés de implementar el método no apareció consignado en la carta constitucional, pero se denotaba el mismo interés de ciertos grupos de poder mexicanos por adoptar este sistema.…”

Section: El Método En Otros Países: México Perú Y La República De La ...unclassified

Origem da escola lancasteriana na Colômbia: historiografia e objetivo de implementação na Constituição de Cúcuta de 1821.

Acevedo Tarazona,

Villamizar Palacios

2024

Rev. hist.edu.latinoam

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Objetivo: Este artículo analiza la adopción y las dificultades de implementación del método lancasteriano en la naciente Colombia de 1821, conformada en su momento por las actuales Colombia, Ecuador y Venezuela. Originalidad/aportes: Se busca explicar las dificultades de implementación del método a la luz de su contexto y en una relación comparada con la experiencia en otros países. Método: El método lancasteriano promulgado en la Constitución de Villa del Rosario de Cúcuta y que nació como el hito más importante de escolarización obligatoria en América Latina, es analizado a la luz del contexto de la Ilustración y su interpretación política republicana en el continente, por medio de la revisión de fuente edita y documental. Estrategias/recolección de información: La recolección de información se realizó a través de revisión documental de fuentes en línea, prensa y revisión de archivo, junto a una búsqueda bibliográfica de lo publicado sobre el tema. Conclusiones: Al considerarse las intenciones de los legisladores por promulgar un Estado educador y las dificultades en la implementación del método lancasteriano en la Colombia de 1821, a propósito de otras experiencias de implementación en México y Perú, fue evidente el fracaso por la debilidad del propio Estado colombiano naciente y las constantes guerras e inestabilidad política.

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“…The deposit never outcrops, but it was intensively mined in the past, and still today several galleries and wells are used for obsidian quarrying and allow us to closely observe and sample the deposit. The abundance of ash led [16] to interpret this deposit as a lahar or a block-and-ash flow. However, other authors [9,17] observed that the deposit also occurs at high elevations, which is not compatible with an emplacement by a lahar or a block and ash flow.…”

Section: Sierra De Las Navajas Obsidianmentioning

confidence: 99%

Influence of Chemical Composition and Microvesiculation on the Chromatic Features of the Obsidian of Sierra de las Navajas (Hidalgo, Mexico)

Donato

Barba

et al. 2022

Minerals

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The obsidian of Sierra de las Navajas is well known for its green color and gold hue. In order to relate these features with compositional and microtextural characteristics, we have carried out a microanalytical study by Wave Dispersion System associated to Electron Probe Micro-Analyzer, Scanning Electron Microscope observation, and X-rays micro-tomographic analyses of samples showing different colors (dark to light green, sometimes with bands of different color intensity) and hues (changing, uniform, no hue). In accordance with previous studies, the green color of the obsidian seems to be related to a high iron content, probably in its reduced state. However, no significant difference in composition occurs between dark and light green samples. The SEM observation and microtomographic study revealed the absence of microcrystals and the occurrence of vesicles of different size, shape, and orientation. Lighter green colors are shown by highly vesiculated surfaces, whereas non-vesiculated samples are darker. On the surfaces with a high concentration of coarse vesicles, a uniform golden hue is observed. Decreasing vesiculation gives a hue changing with the angle of incident light. However, when the vesicularity approaches zero, no hue is visible. The iso-orientation of vesicles along preferential directions and their distribution in bands determine the variation in color intensity and hue on differently oriented surfaces. Microvesiculation also influences other characteristics that were important features for the use of obsidian in the past, such as fracture, transparency, and roughness.

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Las Escuelas Lancasterianas en La Ciudad De México:

Cited by 9 publications

References 0 publications

Distribution and Conservation of the West Indian Manatee (Trichechus manatus Manatus) in the Catazajá Wetlands of Northeast Chiapas, México

Distribution and Conservation of the West Indian Manatee (Trichechus manatus Manatus) in the Catazajá Wetlands of Northeast Chiapas, México

Origem da escola lancasteriana na Colômbia: historiografia e objetivo de implementação na Constituição de Cúcuta de 1821.

Influence of Chemical Composition and Microvesiculation on the Chromatic Features of the Obsidian of Sierra de las Navajas (Hidalgo, Mexico)

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