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30 resultados encontrados para: AUTOR: Newton, Adrian C
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1.
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
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SIBE Campeche
ECO040004601 (Disponible)
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SIBE Chetumal
ECO030007519 (Disponible)
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SIBE San Cristóbal
ECO010015131 (Disponible)
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SIBE Tapachula
ECO020011889 (Disponible)
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ECO050004834 (Disponible)
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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


2.
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
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SIBE San Cristóbal
5246-20 (Disponible)
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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.


3.
- Artículo con arbitraje
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Resumen en: Inglés |
Resumen en inglés

Forest Landscape Restoration (FLR) involves the ecological restoration of degraded forest landscapes, with the aim of benefiting both biodiversity and human well-being. We first identify four fundamental principles of FLR, based on previous definitions. We then critically evaluate the application of these principles in practice, based on the experience gained during an international, collaborative research project conducted in six dry forest landscapes of Latin America. Research highlighted the potential for FLR; tree species of high socioeconomic value were identified in all study areas, and strong dependence of local communities on forest resources was widely encountered, particularly for fuelwood. We demonstrated that FLR can be achieved through both passive and active restoration approaches, and can be cost-effective if the increased provision of ecosystem services is taken into account. These results therefore highlight the potential for FLR, and the positive contribution that it could make to sustainable development. However, we also encountered a number of challenges to FLR implementation, including the difficulty of achieving strong engagement in FLR activities among local stakeholders, lack of capacity for community-led initiatives, and the lack of an appropriate institutional and regulatory environment to support restoration activities. Successful implementation of FLR will require new collaborative alliances among stakeholders, empowerment and capacity building of local communities to enable them to fully engage with restoration activities, and an enabling public policy context to enable local people to be active participants in the decision making process.


4.
- 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.


5.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Structure, composition and dynamics of a calcareous grassland metacommunity over a 70-year interval
Newton, Adrian C. ; Walls, Robin M. (coaut.) ; Golicher, Duncan John (coaut.) ; Keith, Sally A. (coaut.) ; Diaz, Anita (coaut.) ; Bullock, James M. (coaut.) ;
Contenido en: Journal of Ecology Vol. 100, no. 1 (January 2012), p. 196–209 ISSN: 0022-0477
Bibliotecas: San Cristóbal
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SIBE San Cristóbal
21473-20 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

1. Calcareous grasslands are communities of high conservation value, often characterized by high plant species richness. These grasslands have experienced a major decline in area throughout Europe, principally resulting from agricultural intensification. Although they have been the focus of extensive previous research, few attempts have been made to examine the long-term dynamics of multiple communities at the landscape scale. 2. To assess long-term change in the structure and composition of a calcareous grassland metacommunity, 88 extant sites first surveyed by R. Good in the 1930s were resurveyed in 2009. Values of α-, β- and γ-diversity were compared between the two surveys, using a one-way analysis of similarity (ANOSIM) and non-metric multidimensional scaling. Elements of metacommunity structure (EMS) analysis was used to identify metacommunity structure, and changes in metacommunity composition were related to plant traits. 3. Analyses indicated that α-diversity increased over time, with mean (±SD) species richness per site increasing from 29.31 ± 7.65 in the 1930s to 40.18 ± 16.41 in 2009. No change in β-diversity was recorded. However, γ-diversity increased, with the total number of species rising from 219 in the 1930s to 280 in 2009. Species composition shifted over time, associated with a decline in ‘stress-tolerant’ species typical of species-rich calcareous grasslands, and an increase in species typical of mesotrophic grasslands. This was associated with an increase in mean Ellenberg N value, suggesting that eutrophication has been a driver of floristic change.

4. Elements of metacommunity structure analysis indicated that the structure of this grassland plant metacommunity was Clementsian at both survey times, indicating species sorting. Metacommunity structure was stable over time, despite changes in α- and γ-diversity. Analysis of potential structuring mechanisms revealed a significant influence of elevation. 5. Synthesis. This investigation provides a rare example of the long-term dynamics of a plant metacommunity. Results indicate that substantial change has occurred in the composition of calcareous grasslands during this time, both at local and regional scales. The investigation provides evidence of the impact of environmental change on immigration and extinction processes operating in calcareous grasslands at different scales, and highlights challenges for their future conservation.


6.
Capítulo de libro

7.
Capítulo de libro
*Solicítelo con su bibliotecario/a
Dinámica a escala de paisaje y restauración de los ecosistemas forestales de zonas secas
Newton, Adrian C. ; Cantarello, Elena (coaut.) ; Tejedor Garavito, Natalia (coaut.) ; Kitzberger, Thomas (coaut.) ; Echeverría, Cristian (coaut.) ; Williams Linera, Guadalupe (coaut.) ; Golicher, Duncan John (coaut.) ; Bolados Corral, Gustavo (coaut.) ; Malizia, Lucio R. (coaut.) ; Manson, Robert H. (coaut.) ; López Barrera, Fabiola (coaut.) ; Ramírez Marcial, Neptalí (coaut.) (1963-) ; Martínez Icó, Miguel (coaut.) ;
Contenido en: Principios y práctica de la restauración del paisaje forestal: estudios de caso en las zonas secas de América Latinaeditado Gland, Suiza : Unión Internacional para la Conservación de la Naturaleza y los Recursos Naturales, c2011 p. 241-287 ISBN:978-283-1713-94-6
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8.
- Capítulo de libro sin arbitraje
*Solicítelo con su bibliotecario/a
Landscape scale dynamics and restoration of dryland forest ecosystems
Newton, Adrian C. ; Cantarello, Elena (coaut.) ; Tejedor, N. (coaut.) ; Kitzberger, Thomas (coaut.) ; Echeverría, C. (coaut.) ; Williams Linera, Guadalupe (coaut.) ; Golicher, Duncan John (coaut.) ; Bolados, G. (coaut.) ; Malizia, L. (coaut.) ; Manson, R. H. (coaut.) ; López Barrera, Fabiola (coaut.) ; Ramírez Marcial, Neptalí (coaut.) (1963-) ; Martínez Icó, Miguel (coaut.) ; Henriquez, G. (coaut.) ; Hill, R. (coaut.) ;
Contenido en: Principles and practice of forest landscape restoration case studies from the drylands of Latin America International Union for Conservation of Nature and Natural Resources, 2011 p. 229-272 ISBN:978-283-1713-40-3
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9.
Libro
Principios y práctica de la restauración del paisaje forestal: estudios de caso en las zonas secas de América Latina / editado por A. C. Newton y N. Tejedor ; Traductores: José M. Benayas y Marta Rueda
Newton, Adrian C. (ed.) ; Tejedor, N. (coed.) ; Benayas, José M. (tr.) ; Rueda, Marta (cotr.) ;
Gland, Suiza : Unión Internacional para la Conservación de la Naturaleza y los Recursos Naturales :: Fundación Internacional para la Restauración de Ecosistemas , c2011
Clasificación: 634.956 / P7
Bibliotecas: Campeche , San Cristóbal
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SIBE Campeche
ECO040004805 (Disponible)
Disponibles para prestamo: 1
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SIBE San Cristóbal
ECO010006372 (Disponible)
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Índice | Resumen en: Español |
Resumen en español

Este libro presenta los resultados de un proyecto de investigación internacional que fue expresamente diseñado para examinar la aplicación de la estauración del paisaje forestal (RPF) a los ecosistemas forestales de las zonas secas de América Latina. Para que la RPF pueda ser transferida a las prácticas habituales de restauración adoptadas y promovidas por los gobiernos y por el sector privado, así como por las comunidades locales, es necesario conseguir información sobre como los principios de la RPF pueden ser llevados a cabo en la práctica, y de una manera poco costosa pero efectiva. Este proyecto fue diseñado para conseguir esta información.

Índice

Lista de recuadros
Prólogo Agradecimientos
Colaboradores
Abreviaturas
1 Introducción
2 Evaluación de la extensión actual y pérdida reciente de los ecosistemas forestales en zonas secas
3 Evaluación de la fragmentación y degradación de los ecosistemas forestales en zonas secas
4 Fragmentación y efectos de la elevación en la diversidad de Árboles de los bosques secos estacionales de México y Chile
5 Análisis experimental de las técnicas de restauración de los bosques secos
6 Valoración socioeconómica de los recursos forestales en las zonas secas de Argentina, Chile y México
7 Impacto de la fragmentación y degradación de los bosques en los patrones de variación genética y sus consecuencias para la restauración forestal
8 Dinámica a escala de paisaje y restauración de los ecosistemas forestales de zonas secas
9 Identificación de Áreas prioritarias para la restauración de bosques secos
10 Desarrollo de recomendaciones sobre políticas públicas y estrategias de gestión para la restauración de paisajes con bosques secos
11 Síntesis: principios y práctica de la restauración del paisaje forestal


10.
- Libro sin arbitraje
The red list of mexican cloud forest trees / editors: Mario González Espinosa, Jorge A. Meave, Francisco G. Lorea Hernández, Guillermo Ibarra Manríquez and Adrian C. Newton
González Espinosa, Mario (ed.) (1950-) ; Meave, Jorge A. (coed.) ; Lorea Hernández, Francisco G. (coed.) ; Ibarra Manríquez, Guillermo (coed.) ; Newton, Adrian C. (coed.) ;
Cambridge, UK : Fauna and Flora International , 2011
Clasificación: EE/574.526420972 / R4
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ECO040004941 (Disponible) , ECO040004764 (Disponible)
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ECO030007673 (Disponible)
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ECO010008586 (Disponible) , ECO010008465 (Disponible)
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SIBE Tapachula
ECO020012590 (Disponible)
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ECO050005058 (Disponible)
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Índice

Acknowledgements
List of Acronyms
Foreword
Introduction
References
List of Assessors
Map
Red List of Mexican Cloud Forest Trees
Species Evaluated as Least Concern
References
Annex 1
IUCN Red List Categories and Criteria (Version 3.1)