Big-leaf mahogany (Swietenia macrophylla King) is an economically important timber species in the... more Big-leaf mahogany (Swietenia macrophylla King) is an economically important timber species in the Neotropics. For over three centuries, it has been selectively extracted from tropical forests, threatening its populations. We investigate the actual and potential distribution of big-leaf mahogany and assess its abundance on the Yucatan Peninsula based on the National Forest and Soils Inventory database. Furthermore, we evaluate environmental factors associated with its distribution, abundance, and tree size. The actual and potential distribution models show the presence of mahogany in a wide geographic area covering the southern and eastern portions of the Yucatan Peninsula. Abundance of mahogany in the landscape varies and in general is low. The spatial potential distribution model was best explained by the environmental variables of vegetation cover (medium-and high-stature semievergreen tropical forest) and elevation (upland areas). Results also indicate that mahogany remains relat...
La presión sobre los seres vivos ejercida por efectos que la conducta humana, en su crecimiento y... more La presión sobre los seres vivos ejercida por efectos que la conducta humana, en su crecimiento y desarrollo, genera hace que con prioridad surjan programas de conservación y estudio de los recursos naturales, siendo esta la base que justifica el establecimiento del Pinetum "Hans Nienstaedt & Jeffrey K. Donahue" en el estado de Veracruz, México. En ésta colección quedan establecidas las especies representativas del Estado provenientes de fuentes parentales diversas y dando como resultado su permanencia en un diseño que induce procesos naturales de cruza y variabilidad así como su distribución espacial.
Se reportan datos sobre la germinación y morfología de plántulas de cuatro especies (Ceiba aescul... more Se reportan datos sobre la germinación y morfología de plántulas de cuatro especies (Ceiba aesculifolia (H.B. & K.) Britt. & Baker; Ceiba pentandra (L.) Gaerfn.: Pachira aquatica Aubl.; Pseudobombax ellipticum (Kunth) Dugand) de la familia Bombacaceae del estado de Quintana Roo. De las especies tratadas tres presentaron germinación epigea y una presentó germinación criptocotilar. En todos los casos las especies mostraron un porcentaje de germinación alto (78-88%) y una sobrevivencia del 100%. El estudio permitió la elaboración de una clave de identificación para estas plántulas.
Se presenta un análisis de los enfoques paleoecológicos y de ecología contemporánea, resaltando l... more Se presenta un análisis de los enfoques paleoecológicos y de ecología contemporánea, resaltando los posibles alcances de este tipo de estudios para el mejor conocimiento de la vegetación de Quintana Roo, ya que permiten analizar a la vegetación como un sistema dinámico y sujeto a cambios continuos en el tiempo y en el espacio. Quintana Roo con alrededor de 1800 especies de plantas vasculares, se ubica en una zona de alto valor biológico, por lo que constituye un campo ideal para integrar conceptos de ecología contemporánea y teorías de paleoecología de ciclicidad climática e impacto humano sobre un sistema tropical frágil, las selvas.
The present study reports data on distribution, dominance, endemism and degree of vulnerability o... more The present study reports data on distribution, dominance, endemism and degree of vulnerability of 112 tree species present in the forest remnants along the Caribbean coast of northeastern Quintana Roo, Mexico. The coastal area of Quintana Roo degraded the last twenty years mostly due to the accelerated development of tourism, hurricanes and fires of great magnitude. Twenty-one endemic species of trees were recorded, representing 38.8% of the peninsular endemism. Based on distribution, dominance and endemism of the recorded tree species, four degrees of vulnerability are proposed (low, low-medium. medium and high). Following the IUCN criteria only two species (Pseudophoenix sargentii and Trichilia minutgora) were considered as vulnerable or rare. 41.9% of the species present a high degree of vulnerability, followed by the medium degree of vulnerability (40.9%) indicating the urgent need of strategies for the protection of the existing forest remnants.
Unlike most biofuel species, Jatropha curcas has promise for use in marginal lands, but it may se... more Unlike most biofuel species, Jatropha curcas has promise for use in marginal lands, but it may serve an additional role by stabilizing soils. We evaluated the growth and structural responsiveness of young J. curcas plants to diverse soil conditions. Soils included a sand, a sandy-loam, and a clay-loam from eastern Mexico. Growth and structural parameters were analyzed for shoots and roots, although the focus was the plasticity of the primary root system architecture (the taproot and four lateral roots). The sandy soil reduced the growth of both shoot and root systems significantly more than sandy-loam or clay-loam soils; there was particularly high plasticity in root and shoot thickness, as well as shoot length. However, the architecture of the primary root system did not vary with soil type; the departure of the primary root system from an index of perfect symmetry was 14 ± 5% (mean ± standard deviation). Although J. curcas developed more extensively in the sandy-loam and clay-loam soils than in sandy soil, it maintained a consistent root to shoot ratio and root system architecture across all types of soil. This strong genetic determination would make the species useful for soil stabilization purposes, even while being cultivated primarily for seed oil.
... al. 1982; Escalante 1986; Sánchez 1987; Olmsted and Durán 1986). Early ... months. Soils of t... more ... al. 1982; Escalante 1986; Sánchez 1987; Olmsted and Durán 1986). Early ... months. Soils of the medium statured forests are mostly characterized as Lithosol-Rendzina following the FAO soil classifica-tion (Escalante 1986). A ...
Resumen. Este trabajo se refiere al cambio estructural y dañ os generales que sufrió la This pape... more Resumen. Este trabajo se refiere al cambio estructural y dañ os generales que sufrió la This paper describes structural change and damage vegetació n natural del Jardín Botánico Dr Alfredo to the natural tree vegetation in the Dr Alfredo Barrera Marín, después del paso del huracán Barrera Marín Botanical Garden, following Gilberto en septiembre de 1988. El estudio toma Hurricane Gilbert in September, 1988. Postcomo punto de comparació n un trabajo previo hurricane data were compared with pre-hurricane realizado por Sánchez (1987), quien efectuó sus data from the same plots, focusing mainly on mediciones en tres parcelas que fueron establecidas composition and structure. Near complete y estudiadas tres añ os antes del huracán. La mayor defoliation of trees and plants of the understorey parte del dañ o incluyó la defoliació n cercana al occurred and average foliage loss was estimated to 100% de árboles y plantas del sotobosque cayendo be 4.5 t/ha. The density of trees decreased by 33%, en promedio 4.5 t/ha de hojas. La densidad de and the basal area decreased by 12%. Small diameter árboles disminuyó 33%, significando un decremento trees accounted for the great majority of losses and de 12% en el área basal. Los árboles de diamétro trees in the largest diameter classes survived best.
Abstract A chromista, possible Pythium aphanidermatum, was isolated from severely damage seeds an... more Abstract A chromista, possible Pythium aphanidermatum, was isolated from severely damage seeds and seedlings recently started from Jatropha curcas L. non toxic seeds sown in the tropical area of Veracruz, Mexico. In order to study pathogenic Pythium ...
The germination and morphology of seedlings of the following four species (Ceiba aesculifolia (H.... more The germination and morphology of seedlings of the following four species (Ceiba aesculifolia (H.B. & K.) Britt. & Baker.; Ceiba pentandra (L.) Gaertn.; Pachira aquatica Aubl.; Pseudobombax ellipticum (Kunth) Dugand ) of the Bombacaceae family of Quintana Roo state in Mexico was studied. Three species have epigeal seedlings, and one criptocotilar seedling. All species presented high germination percentages (78- 88%) and 100% survived. This allowed the elaboration of an identification key for seedlings. Palabras clave: Bombacaceae, germinación, plántula, morfología, clave de identificación.
This chapter presents an overview of the vegetation types of the Yucatán Peninsula. Mean annual p... more This chapter presents an overview of the vegetation types of the Yucatán Peninsula. Mean annual precipitation, terrain and soil characteristics explain the large-scale distribution of forest types in the Yucatán Peninsula. Tropical (high) forest is found in areas with >800 mm of mean annual precipitation, while dry (low) tropical forest is distributed in areas with <800 mm of mean annual precipitation. Tropical forest has canopy heights of more than 30 m and mostly presents three well-defined vegetative strata. The distribution of tropical forest is mainly in the central, eastern and southern parts of the Yucatán Peninsula. Dry tropical forest has canopy heights up to 20 m, and is widely distributed in the Yucatán Peninsula in different successional stages. Other woody vegetation types include mangroves, petenes and pine savannas. Open vegetation types include coastal dunes, marsh, and savanna vegetation. Disturbed tropical and dry tropical forest of all successional stages covers more than 7.4 million ha at present, and requires detailed management plans to maintain future ecosystems benefits.
Big-leaf mahogany (Swietenia macrophylla King) is an economically important timber species in the... more Big-leaf mahogany (Swietenia macrophylla King) is an economically important timber species in the Neotropics. For over three centuries, it has been selectively extracted from tropical forests, threatening its populations. We investigate the actual and potential distribution of big-leaf mahogany and assess its abundance on the Yucatan Peninsula based on the National Forest and Soils Inventory database. Furthermore, we evaluate environmental factors associated with its distribution, abundance, and tree size. The actual and potential distribution models show the presence of mahogany in a wide geographic area covering the southern and eastern portions of the Yucatan Peninsula. Abundance of mahogany in the landscape varies and in general is low. The spatial potential distribution model was best explained by the environmental variables of vegetation cover (medium-and high-stature semievergreen tropical forest) and elevation (upland areas). Results also indicate that mahogany remains relat...
La presión sobre los seres vivos ejercida por efectos que la conducta humana, en su crecimiento y... more La presión sobre los seres vivos ejercida por efectos que la conducta humana, en su crecimiento y desarrollo, genera hace que con prioridad surjan programas de conservación y estudio de los recursos naturales, siendo esta la base que justifica el establecimiento del Pinetum "Hans Nienstaedt & Jeffrey K. Donahue" en el estado de Veracruz, México. En ésta colección quedan establecidas las especies representativas del Estado provenientes de fuentes parentales diversas y dando como resultado su permanencia en un diseño que induce procesos naturales de cruza y variabilidad así como su distribución espacial.
Se reportan datos sobre la germinación y morfología de plántulas de cuatro especies (Ceiba aescul... more Se reportan datos sobre la germinación y morfología de plántulas de cuatro especies (Ceiba aesculifolia (H.B. & K.) Britt. & Baker; Ceiba pentandra (L.) Gaerfn.: Pachira aquatica Aubl.; Pseudobombax ellipticum (Kunth) Dugand) de la familia Bombacaceae del estado de Quintana Roo. De las especies tratadas tres presentaron germinación epigea y una presentó germinación criptocotilar. En todos los casos las especies mostraron un porcentaje de germinación alto (78-88%) y una sobrevivencia del 100%. El estudio permitió la elaboración de una clave de identificación para estas plántulas.
Se presenta un análisis de los enfoques paleoecológicos y de ecología contemporánea, resaltando l... more Se presenta un análisis de los enfoques paleoecológicos y de ecología contemporánea, resaltando los posibles alcances de este tipo de estudios para el mejor conocimiento de la vegetación de Quintana Roo, ya que permiten analizar a la vegetación como un sistema dinámico y sujeto a cambios continuos en el tiempo y en el espacio. Quintana Roo con alrededor de 1800 especies de plantas vasculares, se ubica en una zona de alto valor biológico, por lo que constituye un campo ideal para integrar conceptos de ecología contemporánea y teorías de paleoecología de ciclicidad climática e impacto humano sobre un sistema tropical frágil, las selvas.
The present study reports data on distribution, dominance, endemism and degree of vulnerability o... more The present study reports data on distribution, dominance, endemism and degree of vulnerability of 112 tree species present in the forest remnants along the Caribbean coast of northeastern Quintana Roo, Mexico. The coastal area of Quintana Roo degraded the last twenty years mostly due to the accelerated development of tourism, hurricanes and fires of great magnitude. Twenty-one endemic species of trees were recorded, representing 38.8% of the peninsular endemism. Based on distribution, dominance and endemism of the recorded tree species, four degrees of vulnerability are proposed (low, low-medium. medium and high). Following the IUCN criteria only two species (Pseudophoenix sargentii and Trichilia minutgora) were considered as vulnerable or rare. 41.9% of the species present a high degree of vulnerability, followed by the medium degree of vulnerability (40.9%) indicating the urgent need of strategies for the protection of the existing forest remnants.
Unlike most biofuel species, Jatropha curcas has promise for use in marginal lands, but it may se... more Unlike most biofuel species, Jatropha curcas has promise for use in marginal lands, but it may serve an additional role by stabilizing soils. We evaluated the growth and structural responsiveness of young J. curcas plants to diverse soil conditions. Soils included a sand, a sandy-loam, and a clay-loam from eastern Mexico. Growth and structural parameters were analyzed for shoots and roots, although the focus was the plasticity of the primary root system architecture (the taproot and four lateral roots). The sandy soil reduced the growth of both shoot and root systems significantly more than sandy-loam or clay-loam soils; there was particularly high plasticity in root and shoot thickness, as well as shoot length. However, the architecture of the primary root system did not vary with soil type; the departure of the primary root system from an index of perfect symmetry was 14 ± 5% (mean ± standard deviation). Although J. curcas developed more extensively in the sandy-loam and clay-loam soils than in sandy soil, it maintained a consistent root to shoot ratio and root system architecture across all types of soil. This strong genetic determination would make the species useful for soil stabilization purposes, even while being cultivated primarily for seed oil.
... al. 1982; Escalante 1986; Sánchez 1987; Olmsted and Durán 1986). Early ... months. Soils of t... more ... al. 1982; Escalante 1986; Sánchez 1987; Olmsted and Durán 1986). Early ... months. Soils of the medium statured forests are mostly characterized as Lithosol-Rendzina following the FAO soil classifica-tion (Escalante 1986). A ...
Resumen. Este trabajo se refiere al cambio estructural y dañ os generales que sufrió la This pape... more Resumen. Este trabajo se refiere al cambio estructural y dañ os generales que sufrió la This paper describes structural change and damage vegetació n natural del Jardín Botánico Dr Alfredo to the natural tree vegetation in the Dr Alfredo Barrera Marín, después del paso del huracán Barrera Marín Botanical Garden, following Gilberto en septiembre de 1988. El estudio toma Hurricane Gilbert in September, 1988. Postcomo punto de comparació n un trabajo previo hurricane data were compared with pre-hurricane realizado por Sánchez (1987), quien efectuó sus data from the same plots, focusing mainly on mediciones en tres parcelas que fueron establecidas composition and structure. Near complete y estudiadas tres añ os antes del huracán. La mayor defoliation of trees and plants of the understorey parte del dañ o incluyó la defoliació n cercana al occurred and average foliage loss was estimated to 100% de árboles y plantas del sotobosque cayendo be 4.5 t/ha. The density of trees decreased by 33%, en promedio 4.5 t/ha de hojas. La densidad de and the basal area decreased by 12%. Small diameter árboles disminuyó 33%, significando un decremento trees accounted for the great majority of losses and de 12% en el área basal. Los árboles de diamétro trees in the largest diameter classes survived best.
Abstract A chromista, possible Pythium aphanidermatum, was isolated from severely damage seeds an... more Abstract A chromista, possible Pythium aphanidermatum, was isolated from severely damage seeds and seedlings recently started from Jatropha curcas L. non toxic seeds sown in the tropical area of Veracruz, Mexico. In order to study pathogenic Pythium ...
The germination and morphology of seedlings of the following four species (Ceiba aesculifolia (H.... more The germination and morphology of seedlings of the following four species (Ceiba aesculifolia (H.B. & K.) Britt. & Baker.; Ceiba pentandra (L.) Gaertn.; Pachira aquatica Aubl.; Pseudobombax ellipticum (Kunth) Dugand ) of the Bombacaceae family of Quintana Roo state in Mexico was studied. Three species have epigeal seedlings, and one criptocotilar seedling. All species presented high germination percentages (78- 88%) and 100% survived. This allowed the elaboration of an identification key for seedlings. Palabras clave: Bombacaceae, germinación, plántula, morfología, clave de identificación.
This chapter presents an overview of the vegetation types of the Yucatán Peninsula. Mean annual p... more This chapter presents an overview of the vegetation types of the Yucatán Peninsula. Mean annual precipitation, terrain and soil characteristics explain the large-scale distribution of forest types in the Yucatán Peninsula. Tropical (high) forest is found in areas with >800 mm of mean annual precipitation, while dry (low) tropical forest is distributed in areas with <800 mm of mean annual precipitation. Tropical forest has canopy heights of more than 30 m and mostly presents three well-defined vegetative strata. The distribution of tropical forest is mainly in the central, eastern and southern parts of the Yucatán Peninsula. Dry tropical forest has canopy heights up to 20 m, and is widely distributed in the Yucatán Peninsula in different successional stages. Other woody vegetation types include mangroves, petenes and pine savannas. Open vegetation types include coastal dunes, marsh, and savanna vegetation. Disturbed tropical and dry tropical forest of all successional stages covers more than 7.4 million ha at present, and requires detailed management plans to maintain future ecosystems benefits.
Uploads
Papers by Odilon Sanchez