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26 resultados encontrados para: AUTOR: Cayuela Delgado, Luis
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1.
- Artículo con arbitraje
Tropical tree species diversity in a mountain system in southern Mexico: local and regional patterns and determinant factors
Martínez Camilo, Rubén ; González Espinosa, Mario (coaut.) (1950-) ; Ramírez Marcial, Neptalí (coaut.) (1963-) ; Cayuela Delgado, Luis (coaut.) ; Pérez Farrera, Miguel Ángel (coaut.) ;
Contenido en: Journal of Environmental Management Vol. 50, no. 3 (May 2018), p. 499–509 ISSN: 1744-7429
PDF
Resumen en: Inglés |
Resumen en inglés

Mechanisms explaining patterns of biodiversity along elevation gradients in tropical mountain systems remain controversial. We use a set of climatic, topographic, and soil variables encompassing regional, landscape, and local-level spatial scales to explain the spatial variation of tree species diversity in the Sierra Madre of Chiapas, Mexico. We sampled 128 circular plots (0.1-ha each) in four elevational bands along four elevation gradients or transects encompassing 100–2200 m. A total of 12,533 trees belonging to 444 species were recorded. Diversity patterns along the elevation gradient and the explanatory power of independent variables were dependent on spatial scale (regional vs transect) and functional group (total vs late-successional or pioneer species). Diversity of all species and late-successional species (1 – proportion of pioneer species) showed a constant pattern at the regional and transect scales, with low predictive power of climatic variables and/or elevation. A linear decrease in either number or proportion of pioneer species diversity was observed with increasing elevation, which was correlated with temperature, rainfall, and human disturbance trends. Total species diversity showed an increase with rainfall of the warmest quarter, indicating a regional-level limiting effect of seasonality (drought duration). Yet the explanatory power of climatic and topographic variables was higher at the individual transect level than at the regional scale, suggesting the parallel but differential influence of evolutionary and geological history factors on diversification not so far studied to explain elevation patterns of species diversity in tropical mountain systems.


2.
Tesis - Doctorado
Variación espacial de la diversidad arbórea en un gradiente altitudinal y efecto del disturbio humano en la Sierra Madre de Chiapas, México / Rubén Martínez Camilo
Martínez Camilo, Rubén ; González Espinosa, Mario (director) (1950-) ; Ramírez Marcial, Neptalí (asesor) (1963-) ; Cayuela Delgado, Luis (asesor) ; Pérez Farrera, Miguel Ángel (asesor) ;
San Cristóbal de Las Casas, Chiapas, México : El Colegio de la Frontera Sur , 2018
Clasificación: TE/577.3097275 / M3
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010019435 (Disponible)
Disponibles para prestamo: 1
PDF
Índice | Resumen en: Español |
Resumen en español

La variación espacial de la biodiversidad y la contribución relativa de los mecanismos que la explican es un tema debatible en la ecología contemporánea. En este estudio se evaluó el efecto relativo de variables climáticas, topográficas, edáficas y de disturbio humano sobre la diversidad de árboles en un gradiente altitudinal y longitudinal en la Sierra Madre de Chiapas, México. Se determinaron cuatro transectos altitudinales distribuidos en ~160 km, en cada transecto se delimitaron cuatro bandas de elevación (100-2200 m) y se establecieron ocho parcelas de 0.1 ha en cada banda (128 en total). Se contaron todos los individuos de árboles con un diámetro a la altura del pecho ≥5 cm. En total se midieron 12,533 árboles de 444 especies. Los patrones de diversidad alfa detectados fueron: una diversidad constante o uniforme a lo largo del gradiente altitudinal, un incremento de la diversidad hacia las partes altas, una disminución hacia las partes altas y un incremento de la diversidad en la parte intermedia del gradiente altitudinal. El recambio de especies es alto, principalmente en el gradiente altitudinal más que en el longitudinal. No se encontró un modelo general determinante que explique la variación de la diversidad; el efecto y jerarquía de las variables predictivas dependieron de la escala de estudio (regional vs transecto) y la ubicación del transecto (de sureste a noroeste). Las variables predictivas más relevantes fueron la duración de la estacionalidad, la temperatura –correlacionado a su vez con altitud y precipitación– y, en menor magnitud las variables edáficas.

La similitud entre la composición de individuos adultos y juveniles a lo largo de un gradiente de disturbio humano, indica que los bosques de las partes bajas han sido modificados en mayor medida que las partes altas. Este estudio demuestra la complejidad para explicar la variación de la diversidad cuando se incrementa la escala de estudio, sugiriendo la necesidad de incorporar variables relacionadas con los procesos evolutivos y geológicos para explicar la alta biodiversidad de la Sierra Madre de Chiapas.

Índice

Resumen general
Capítulo 1. Introducción general
Objetivos e hipótesis
Métodos generales
Estructura de la tesis
Capítulo 2. Tropical tree species diversity in a mountain system in southern Mexico: local and regional patterns and determinant factors
Capítulo 3. Species replacement along elevational and longitudinal gradients contribute to high gamma diversity in tropical mountain forests in Southern Mexico
Capítulo 4. El disturbio humano desacopla los ensamblajes de regeneración respecto de los árboles adultos
Capítulo 5. Conclusiones generales
Literatura citada


3.
Tesis - Doctorado
Deforestación y fragmentación de bosques secos en la Depresión Central de Chiapas, México / Raúl Abel Vaca Genuit
Vaca Genuit, Raúl Abel ; Golicher, Duncan John (tutor) ; Cayuela Delgado, Luis (asesor) ; Newton, Adrian C. (asesor) ; Ramírez Marcial, Neptalí (asesor) (1963-) ;
San Cristóbal de Las Casas, Chiapas, México : El Colegio de la Frontera Sur , 2012
Clasificación: TE/333.751370972 / V3
Cerrar
SIBE Campeche
ECO040004601 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Chetumal
ECO030007519 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
ECO010015131 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Tapachula
ECO020011889 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
ECO050004834 (Disponible)
Disponibles para prestamo: 1
PDF
Índice

Capítulo 1. Introducción y métodos generales
1.1. Introducción general
1.2. Objetivos
1.3. Objetivos específicos, hipótesis y preguntas
1.4. Organización de la tesis doctoral
1.5. Métodos generales
Capítulo 2. Evidence of incipient forest transition in Southern Mexico
2.1. Resumen en castellano
2.2. Introduction
2.3. Methods
2.4. Results
2.5. Discussion
2.6. Conclusions
2.7. Tables and figures
Capítulo 3. Applying climatically based random forest models to downscale coarse grained potential vegetation maps in tropical México
3.1. Resumen en castellano
3.2. Introduction
3.3. Methods
3.4. Results
3.5. Discussion
3.6. Conclusions
3.7. Tables and figures
Capítulo 4. Impact of human land use on dry forest biodiversity in the Central Depression of Chiapas, Mexico
4.1. Resumen en castellano
4.2. Introduction
4.3. Methods
4.4. Results
4.5. Discussion
4.6. Conclusions
4.7. Tables and figures
Capítulo 5. Drivers of deforestation in the Central Depression of Chiapas: Inference on process from pattern analysis using generalised additive models
5.1. Resumen en castellano
5.2. Introduction
5.3. Methods
5.4. Results
5.5. Discussion
5.6. Conclusions
5.7. Tables and figures
Capítulo 6. Discusión y conclusiones generales


4.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Effects of climate change on the potential species richness of mesoamerican forests
Golicher, Duncan John ; Cayuela Delgado, Luis (coaut.) ; Newton, Adrian C. (coaut.) ;
Contenido en: Biotropica Vol. 44, no. 3 (May 2012), p. 284–293 ISSN: 0006-3606
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
5246-20 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

The realized species richness of tropical forests cannot yet be reliably mapped at a regional scale due to lack of systematically collected data. An estimate of the potential species richness (PSR), however, can be produced through the use of species distribution modelling. PSR is interpretable as a climatically determined upper limit to observed species richness. We mapped current PSR and future PSR under climate change scenarios for Mesoamerica by combining the spatial distributions of 2000 tree species as predicted by generalized additive models built from herbaria records and climate layers. An explanatory regression tree was used to extract conditional rules describing the relationship between PSR and climate. The results were summarized by country, ecoregion and protected area status in order to investigate current and possible future variability in PSR in the context of regional biodiversity conservation. Length of the dry season was found to be the key determinant of PSR. Protected areas were found to have higher median PSR values than unprotected areas in most of the countries within the study area. Areas with exceptionally high PSR, however, remain unprotected throughout the region. Neither changes in realized species richness nor extinctions will necessarily follow changes in modelled PSR under climate change. However model output suggests that an increase in temperature of around 3°C, combined with a 20 percent decrease in rainfall could lead to a widespread reduction of around 15 percent of current PSR, with values of up to 40 percent in some moist lower montane tropical forests. The modelled PSR of dry forest ecoregions was found to be relatively stable. Some cooler upper montane forests in northern Mesoamerica, where few species of tropical origin are currently found, may gain PSR if species are free to migrate.


5.
Artículo
Evidence of incipient forest transition in southern Mexico
Vaca Genuit, Raúl Abel (coaut.) ; Golicher, Duncan John (coaut.) ; Cayuela Delgado, Luis (coaut.) ; Hewson, Jenny (coaut.) ; Steinmann, Víctor W. (coaut.) ;
Contenido en: PLoS ONE Vol. 7, no. 8, e42309 (August 2012), p. 1-15 ISSN: 1932-6203
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Resumen en: Inglés |
Resumen en inglés

Case studies of land use change have suggested that deforestation across Southern Mexico is accelerating. However, forest transition theory predicts that trajectories of change can be modified by economic factors, leading to spatial and temporal heterogeneity in rates of change that may take the form of the Environmental Kuznets Curve (EKC). This study aimed to assess the evidence regarding potential forest transition in Southern Mexico by classifying regional forest cover change using Landsat imagery from 1990 through to 2006. Patterns of forest cover change were found to be complex and non-linear. When rates of forest loss were averaged over 342 municipalities using mixed-effects modelling the results showed a significant (p<0.001) overall reduction of the mean rate of forest loss from 0.85% per year in the 1990–2000 period to 0.67% in the 2000–2006 period. The overall regional annual rate of deforestation has fallen from 0.33% to 0.28% from the 1990s to 2000s. A high proportion of the spatial variability in forest cover change cannot be explained statistically. However analysis using spline based general additive models detected underlying relationships between forest cover and income or population density of a form consistent with the EKC.

The incipient forest transition has not, as yet, resulted in widespread reforestation. Forest recovery remains below 0.20% per year. Reforestation is mostly the result of passive processes associated with reductions in the intensity of land use. Deforestation continues to occur at high rates in some focal areas. A transition could be accelerated if there were a broader recognition among policy makers that the regional rate of forest loss has now begun to fall. The changing trajectory provides an opportunity to actively restore forest cover through stimulating afforestation and stimulating more sustainable land use practices. The results have clear implications for policy aimed at carbon sequestration through reducing deforestation and enhancing forest growth.


6.
- Artículo con arbitraje
*En hemeroteca, SIBE-Chetumal
Impacts of cattle on the South American temperate forests: challenges for the conservation of the endangered monkey puzzle tree (Araucaria araucana) in Chile
Zamorano Elgueta, Carlos Patricio ; Cayuela Delgado, Luis (coaut.) ; González Espinosa, Mario (coaut.) (1950-) ; Lara Aguilar, Antonio (coaut.) ; Parra Vázquez, Manuel Roberto (coaut.) ;
Contenido en: Biological Conservation Vol. 152 (August 2012), p. 110–118 ISSN: 0006-3207
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
51503-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Chetumal
Resumen en: Inglés |
Resumen en inglés

Notwithstanding the increasing cattle activity on the South American temperate forests, its impacts on the forests regeneration are yet poorly understood. We investigated the influence of cattle on the regeneration of monkey puzzle tree (Araucaria), an endangered conifer of the temperate forests of Chile and Argentina, on properties of small landowners and of timber companies. In thirty-six 100 × 20 m plots, we recorded the number of seedlings and saplings from seeds and resprouts, the number of cattle dung pats and the density of parent trees. We used the cattle dung pats as a surrogate of cattle activity (the cattle intensity index, CAI). The regeneration was analyzed as a function of the CAI, land tenure regime, the study site, and the number of parent Araucaria trees. We used likelihood methods and model selection for data analysis. Overall, there was a negative exponential influence of the CAI on all response variables. In small landowner forests, even low cattle intensities caused regeneration to drop rapidly to zero, whereas in plots owned by timber companies regeneration decreased smoothly as the CAI increased. The CAI affected regeneration of Araucaria qualitatively by decreasing the ratio of sexual/asexual regeneration, which may lead to problems of genetic drift in the long-term. Our results suggest that conservation of a single species does not necessarily ensure its long-term persistence. It is necessary to protect the ecosystems in which the species grows and involve local stakeholders in the development of management strategies that reduce the impacts of cattle ranching.


7.
- Artículo con arbitraje
Pseudo-absences, pseudo-models and pseudo-niches: pitfalls of model selection based on the area under the curve
Golicher, Duncan John ; Ford, Andrew (coaut.) ; Cayuela Delgado, Luis (coaut.) ; Newton, Adrian C. (coaut.) ;
Contenido en: International Journal of Geographical Information Science Vol. 26, no. 11 (November 2012), p. 2049–2063 ISSN: 1365-8816
Resumen en: Inglés |
Resumen en inglés

The area under the curve (AUC) of the receiver operator characteristic (ROC) graph is regarded as an objective measure of the discrimination accuracy of predictive models. AUC scores calculated from background values, or pseudo-absences, have been proposed as a method of model selection for species distribution models (SDMs) fitted to presence-only data. However, the utility of AUC as a measure of model performance when data on confirmed absence are unavailable has not been fully investigated.We fitted SDMs using informative climatic variables for 2000 species of Mesoamerican trees. As a reference, we also built ‘pseudo-models’ using Gaussian random fields with no biological meaning. AUC correctly selected SDMs fitted to single environmental variables over ‘pseudo-models’ fitted to single random fields in almost all cases. However, when all seven variables were included in the models, AUC erroneously selected complex pseudo-models over complex climate models in 17% of the cases. The spatial distribution patterns predicted by the pseudo-models differed from the results derived from climate-based models, even when overall AUC scores were similar. Both model and pseudo-model AUC values increased when presence points were few and spatially aggregated. The results show that AUC calculated from presence-only data can be an unreliable guide for model selection. Pseudo-absences have ill-defined properties that challenge the interpretation of AUC values. Inference on multidimensional niche spaces should not be supported by AUC values calculated using pseudo-absences.


8.
- Artículo con arbitraje
La red internacional de inventarios forestales (Biotree-net) en Mesoamérica: avances, retos y perspectivas futuras
Cayuela Delgado, Luis ; Gálvez Bravo, Lucía (coaut.) ; Albuquerque, Fabio S. de (coaut.) ; Golicher, Duncan John (coaut.) ; González Espinosa, Mario (coaut.) (1950-) ; Ramírez Marcial, Neptalí (coaut.) (1963-) ; Rey Benayas, José María (coaut.) ; Zahawi, Rakan A. (coaut.) ; Meave, Jorge A. (coaut.) ; Benito, B. M. (coaut.) ; Garibaldi Escobar, Cristina (coaut.) ; Chan, I. (coaut.) ; Pérez Pérez, R. (coaut.) ; Field, Richard (coaut.) ; Balvanera, Patricia (coaut.) ; Castillo Santiago, Miguel Ángel (coaut.) ; Figueroa Rangel, Blanca Lorena (coaut.) ; Griffith, Daniel M. (coaut.) ; Islebe, Gerald A. (coaut.) ; Kelly, Daniel Lucius (coaut.) ; Olvera Vargas, Miguel (coaut.) ; Schnitzer, Stefan A. (coaut.) ; Velázquez, E. (coaut.) ; Williams Linera, Guadalupe (coaut.) ; Brewer, Steven W. (coaut.) ; Camacho Cruz, Angélica (coaut.) ; Coronado, Indiana (coaut.) ; De Jong, Bernardus Hendricus Jozeph (coaut.) ; Castillo, R. del (coaut.) ; Granzow de la Cerda, Iñigo (coaut.) ; Fernández, J. (coaut.) ; Fonseca, William (coaut.) ; Galindo Jaimes, Luis (coaut.) ; Gillespie, Thomas W. (coaut.) ; González Rivas, Benigno (coaut.) ; Gordon, John E. (coaut.) ; Hurtado, Johanna (coaut.) ; Linares Alonso, Antonio (coaut.) ; Letcher, Susan G. (coaut.) ; Mangan, Scott A. (coaut.) ; Méndez, V. Ernesto (coaut.) ; Meza, Víctor (coaut.) ; Ochoa Gaona, Susana (coaut.) ; Peterson, Chris J. (coaut.) ; Ruiz Gutiérrez, Viviana (coaut.) ; Snarr, Kymberley A. (coaut.) ; Tun Dzul, Fernando Jesús (coaut.) ; Valdéz Hernández, Mirna (coaut.) ; Viergever, Karin M. (coaut.) ; White, David A. (coaut.) ; Williams, J. N. (coaut.) ; Bonet, Francisco J. (coaut.) ; Zamora, Regino (coaut.) ;
Contenido en: Ecosistemas Vol. 21, no. 1-2 (enero-agosto 2012), p. 126-135 ISSN: 1697-2473
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Resumen en: Español | Inglés |
Resumen en español

Los esfuerzos de conservación en la región neotropical están limitados por la falta de información disponible sobre las especies, ya que muchas no han sido descritas o se tiene poca información sobre ellas. La Red Internacional de Inventarios Forestales (BIOTREE-NET) concentra y facilita el acceso a la información y el intercambio entre investigadores, gestores y conservacionistas, organizando y estandarizando los datos de especies de árboles procedentes de inventarios forestales en la región mesoamericana en una única base de datos que incluya información espacial. Este artículo explica el ámbito y objetivos de la red, describe la estructura de la base de datos e identifica los principales avances realizados, así como los retos y perspectivas futuras. La base de datos contiene más de 50 000 registros de árboles de unas 5000 especies, distribuidas en más de 2000 parcelas muestreadas desde el suroeste de México hasta Panamá. La información es heterogénea, tanto en su naturaleza y forma como en la cobertura geográfica de los inventarios. La base de datos tiene una estructura relacional, con 12 tablas interconectadas, incluyendo información sobre las parcelas, los nombres de las especies, el diámetro a la altura del pecho de los árboles medidos y sus atributos funcionales. Se ha desarrollado un sistema para la corrección de errores tipográficos y la estandarización taxonómica y nomenclatural utilizando como referencia The Plant List (http://theplantlist.org/). También se han generado modelos de distribución potencial para cerca de 1700 especies utilizando distintos métodos y en el futuro se prevé habilitar también el acceso público a los modelos de distribución de especies a través del portal web (http://portal.biotreenet.com).

Aunque BIOTREE-NET ha contribuido al desarrollo de mejores modelos de distribución, su mayor potencial radica, en nuestra opinión, en el estudio a nivel de comunidades. Finalmente, se reconoce la necesidad de expandir la red a través de la participación de más investigadores interesados en colaborar con datos para ampliar el conocimiento sobre la biodiversidad forestal en la región neotropical.

Resumen en inglés

Conservation efforts in Neotropical regions are often hindered by lack of data, since for many species there is a vacuum of information, and many species have not even been described yet. The International Network of Forest Inventory Plots (BIOTREE-NET) gathers and facilitates access to tree data from forest inventory plots in Mesoamerica, while encouraging data exchange between researchers, managers and conservationists. The information is organised and standardised into a single database that includes spatially explicit data. This article describes the scope and objectives of the network, its progress, and the challenges and future perspectives. The database includes above 50 000 tree records of over 5000 species from more than 2000 plots distributed from southern Mexico through to Panama. Information is heterogeneous, both in nature and shape, as well as in the geographical coverage of inventory plots. The database has a relational structure, with 12 inter-connected tables that include information about plots, species names, dbh, and functional attributes of trees. A new system that corrects typographical errors and achieves taxonomic and nomenclatural standardization was developed using The Plant List (http://theplantlist.org/) as reference. Species distribution models have been computed for around 1700 species using different methods, and they will be publicly accessible through the web site in the future (http://portal.biotreenet.com). Although BIOTREE-NET has contributed to the development of improved species distribution models, its main potential lies, in our opinion, in studies at the community level. Finally, we emphasise the need to expand the network and encourage researchers willing to share data and to join the network and contribute to the generation of further knowledge about forest biodiversity in Neotropical regions.


9.
- Artículo con arbitraje
The Tree Biodiversity Network (BIOTREE-NET): prospects for biodiversity research and conservation in the Neotropics
Cayuela Delgado, Luis ; Gálvez Bravo, Lucía (coaut.) ; Pérez Pérez, Juan Ramón (coaut.) ; Albuquerque, Fabio S. de (coaut.) ; Golicher, Duncan John (coaut.) ; Zahawi, Rakan A. (coaut.) ; Ramírez Marcial, Neptalí (coaut.) (1963-) ; Garibaldi Escobar, Cristina (coaut.) ; Field, Richard (coaut.) ; Rey Benayas, José María (coaut.) ; González Espinosa, Mario (coaut.) (1950-) ; Balvanera, Patricia (coaut.) ; Castillo Santiago, Miguel Ángel (coaut.) ; Figueroa Rangel, Blanca Lorena (coaut.) ; Griffith, Daniel M. (coaut.) ; Islebe, Gerald A. (coaut.) ; Kelly, Daniel L. (coaut.) ; Olvera Vargas, Miguel (coaut.) ; Schnitzer, Stefan A. (coaut.) ; Velázquez, Eduardo (coaut.) ; Williams Linera, Guadalupe (coaut.) ; Brewer, Steven W. (coaut.) ; Camacho Cruz, Angélica (coaut.) ; Coronado, Indiana (coaut.) ; De Jong, Bernardus Hendricus Jozeph (coaut.) ; Del Castillo Sánchez, Rafael Felipe (coaut.) ; Granzow de la Cerda, Iñigo (coaut.) ; Fernández, Javier (coaut.) ; Fonseca, William (coaut.) ; Galindo Jaimes, Luis (coaut.) ; Gillespie, Thomas W. (coaut.) ; González Rivas, Benigno (coaut.) ; Gordon, James E. (coaut.) ; Hurtado, Johanna (coaut.) ; Linares, José (coaut.) ; Letcher, Susan G. (coaut.) ; Mangan, Scott A. (coaut.) ; Meave, Jorge A. (coaut.) ; Méndez, Ernesto V. (coaut.) ; Meza, Víctor (coaut.) ; Ochoa Gaona, Susana (coaut.) ; Peterson, Chris J. (coaut.) ; Ruiz Gutiérrez, Viviana (coaut.) ; Snarr, Kymberley A. (coaut.) ; Tun Dzul, Fernando Jesús (coaut.) ; Valdéz Hernández, Mirna (coaut.) ; Viergever, Karin M. (coaut.) ; White, David A. (coaut.) ; Williams, John N. (coaut.) ; Bonet, Francisco J. (coaut.) ; Zamora, Regino (coaut.) ;
Contenido en: Biodiversity and Ecology Vol. 4, (2012), p. 211-224 ISSN: 1613-9801
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Resumen en: Inglés |
Resumen en inglés

Biodiversity research and conservation efforts in the tropics are hindered by the lack of knowledge of the assemblages found there, with many species undescribed or poorly known. Our initiative, the Tree Biodiversity Network (BIOTREE-NET), aims to address this problem by assembling georeferenced data from a wide range of sources, making these data easily accessible and easily queried, and promoting data sharing. The database (GIVD ID NA-00-002) currently comprises ca. 50,000 tree records of ca. 5,000 species (230 in the IUCN Red List) from >2,000 forest plots in 11 countries. The focus is on trees because of their pivotal role in tropical forest ecosystems (which contain most of the world's biodiversity) in terms of ecosystem function, carbon storage and effects on other species. BIOTREE-NET currently focuses on southern Mexico and Central America, but we aim to expand coverage to other parts of tropical America. The database is relational, comprising 12 linked data tables. We summarise its structure and contents. Key tables contain data on forest plots (including size, location and date(s) sampled), individual trees (including diameter, when available, and both recorded and standardised species name), species (including biological traits of each species) and the researchers who collected the data. Many types of queries are facilitated and species distribution modelling is enabled. Examining the data in BIOTREE-NET to date, we found an uneven distribution of data in space and across biomes, reflecting the general state of knowledge of the tropics. More than 90% of the data were collected since 1990 and plot size varies widely, but with most less than one hectare in size. A wide range of minimum sizes is used to define a 'tree'. The database helps to identify gaps that need filling by further data collection and collation.


10.
- Capítulo de libro sin arbitraje
Assessing the current extent and recent loss of dryland forest ecosystems
Rey Benayas, José María (autor) ; Cristóbal, Luciana (autora) ; Kitzberger, Thomas (autor) ; Manson, Robert H. (autor) ; López Barrera, Fabiola (autora) ; Schulz, Jennifer (autora) ; Vaca Genuit, Raúl Abel (autor) ; Cayuela Delgado, Luis (autor) ; Rivera García, Raúl (autor) ; Malizia, Lucio Ricardo (autor) ; Golicher, Duncan John (autor) ; Echeverría, Cristian (autor) ; Del Castillo Sánchez, Rafael Felipe ; Salas, Javier (autor) ;
Disponible en línea
Contenido en: Principles and practice of forest landscape restoration : case studies from the drylands of Latin America / edited by A.C. Newton and N. Tejedor Gland, Switzerland : International Union for Conservation of Nature and Natural Resources, c2011 p. 23-63 ISBN:978-283-1713-40-3
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