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5 resultados encontrados para: AUTOR: Vela Peláez, Alejandro A
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1.
Libro
The holocene and anthropocene environmental history of Mexico: a paleoecological approach on Mesoamerica / editors: Nuria Torrescano Valle, Gerald A. Islebe, Priyadarsi D. Roy
Torrescano Valle, Nuria (editora) ; Islebe, Gerald A. (editor) ; Roy, Priyadarsi Debajyoti (editor) ;
Cham, Switzerland : Springer International Publishing , c2019
Disponible en línea
Clasificación: EE/577 / H6
Bibliotecas: Campeche , San Cristóbal
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SIBE Campeche
ECO040007071 (Disponible)
Disponibles para prestamo: 1
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SIBE San Cristóbal
ECO010019867 (Disponible)
Disponibles para prestamo: 1
Resumen en español

This book provides essential information on Mexico’s Holocene and Anthropocene climate and vegetation history. Considering the geography of Mexico – which is home to a variety of climatic and environmental conditions, from desert and tropical to high mountain climates – this book focuses on its postglacial paleoecology and paleoclimatology. Further, it analyses human intervention since the middle Holocene as a major agent of environmental change. Offering a valuable tool for understanding past climate change and its relationship with present climate change, the book is a must-read for botanists, ecologists, palaeontologists and graduate students in related fields.

Índice

1 Introduction: The Holocene and Anthropocene Environmental History of Mexico
References
2 Paleoclimate of the Gulf of California (Northwestern Mexico) During the Last 2000 Years
Introduction
Regional Settings
Processes Responsible for the Sedimentation Cycle
Hydrological Processes Linked to Climate and Anthropogenic Changes
Integrated Water–Vertical Settling Studies in the Alfonso Basin
Climate Variations: Interannual, Centennial, and Millennial Scales
Centennial–Scale Variability
Climate Modeling
Conclusions
References
3 Holocene Hydroclimate of the Subtropical Mexico: A State of the Art
Introduction
Modern Climate
Register and Hypothesis
Vegetation Composition
Hydrological Variation and Climate Forcing
Conclusions
References
4 The Environment of Ancient Cloud Forests in the Mexican Pacific
The Mexican Pacific
The Past Environments in the Mexican Pacific
The Present Cloud Forest
The Ancient Cloud Forests
Methods
Results
Discussion
Conclusion
References
5 Sea Level Change and Its Influence on the Coastal Landscape in the Gulf of Mexico During the Holocene
Introduction
Vegetation Types in the Gulf of Mexico
Vegetation Response to Sea Level
Human Impact on Coastal Vegetation
Conclusion
References
6 Insights into the Holocene Environmental History of the Highlands of Central Mexico
Introduction
Central Mexico
Holocene Environment
References
7 Integration of Landscape Approaches for the Spatial Reconstruction of Vegetation
Introduction
Methods
Results
Discussion
References
8 Volcanic Activity in Mexico During the Holocene
Introduction
Distribution of Volcanoes in Mexico
Holocene Eruptions from Volcanoes in Mexico
Active Stratovolcanoes and Calderas
Monogenetic Volcanic Fields
Outlook of Holocene Volcanism
References


2.
- Capítulo de libro con arbitraje
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Human influence versus natural climate variability
Torrescano Valle, Nuria (autora) ; Ramírez Barajas, Pablo Jesús (autor) ; Islebe, Gerald A. (autor) ; Vela Pelaez, Alejandro Antonio (autor) ; Folan Higgins, William J. (autor) ;
Disponible en línea
Contenido en: The holocene and anthropocene environmental history of Mexico: a paleoecological approach on Mesoamerica Cham, Switzerland : Springer International Publishing, 2019 página 171-194 ISBN:978-3-030-31718-8
Bibliotecas: Campeche , Chetumal , San Cristóbal
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SIBE Campeche
59783-30 (Disponible)
Disponibles para prestamo: 1
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SIBE Chetumal
59783-20 (Disponible)
Disponibles para prestamo: 1
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SIBE San Cristóbal
59783-10 (Disponible)
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Resumen en español

This chapter discusses past climate change drivers and ecological responses in southeastern Mexico. Ancient human influence on ecosystems is evident from sediment cores. Past human activities are evident in fossil records but make the interpretation of the past climatic signals more difficult. Conversely the human signal provides important evidence for understanding the level of human impact on the climate system and ecosystems. Four sediment cores at different locations of the Yucatán Peninsula were analyzed for fossil pollen and geochemistry. Human-induced ecological change was evaluated compared to climate-driven environmental change. Fossil pollen gave a clear signal of landscape and precipitation change in the Preclassic and Classic periods. The geochemical ratios provided evidence of local and regional hydrological change. The Chumpich Lake registry reveals that the management of low forests was efficient and indicates good hydrological control in the landscape. However this evidence is different in other sites from Yucatán Peninsula with deficient erosion control. Probably due to the differential climate response in the Chumpich–Uxul region, the drought was not as drastic as in other places.


3.
- Artículo con arbitraje
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Holocene precipitation changes in the Maya forest, Yucatán peninsula, Mexico
Vela Pelaez, Alejandro Antonio ; Torrescano Valle, Nuria (coaut.) ; Islebe, Gerald A. (coaut.) ; Mas, Jean François (coaut.) ; Weissenberger, Holger (coaut.) ;
Contenido en: Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 505 (September 2018), p. 42-52 ISSN: 0031-0182
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Resumen en: Inglés |
Resumen en inglés

Holocene fossil pollen samples (n=38) from Lake Silvituc in Mexico were analyzed with the analog technique using modern pollen samples (n=98) of the Yucatán Peninsula, Mexico. Calculated dissimilarity indices allow us to reconstruct the vegetation and to develop a precipitation record for the last 7900 years. The Middle Holocene shows a gradual increase of precipitation and a marked drop in reconstructed precipitation around 4200 BCE. During the Late Holocene two phases were identified: Phase I (2500 BCE – 1 CE) shows the greatest increase in precipitation with four peaks around 1200 BCE, 650 BCE, 200 BCE and 1 CE. Also a period of increased precipitation resulted for the period between 200 and 500 BCE. Periods of reduced precipitation were detected at 900–1100 BCE, 500–600 BCE and 100–190 BCE. Phase II (1–2000 CE) encompasses several strong dry events during the following periods: 150–300 CE, 750–900 CE, 1050–1180 CE, and 1530–1580 CE. A strong reduction of 32% in precipitation in the late Preclassic Period (100–300 CE) was detected. Non-analogs of Phase II are associated with periods of reduced precipitation and fall into time periods of extended droughts related to the Maya Late Classic and the Little Ice Age. A limiting factor on the use of analogs for tropical forests is that a combination of different analogs for the same fossil pollen signal exists. Interpretation under these circumstances requires good knowledge of the ecology of the taxa and a priori characterization of the modern samples.


4.
- Artículo con arbitraje
The Paleoanthropocene of the Yucatán Peninsula: palynological evidence of environmental change
Islebe, Gerald A. ; Torrescano Valle, Nuria (coaut.) ; Aragón Moreno, Alejandro Antonio (coaut.) ; Vela Peláez, Alejandro A. (coaut.) ; Valdéz Hernández, Mirna (coaut.) ;
Contenido en: Boletín de la Sociedad Geológica Mexicana Vol. 70, no. 1 (March 2018), p. 49-60 ISSN: 1405-3322
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Resumen en: Español | Inglés |
Resumen en español

Las actividades humanas han influenciado sobre los paisajes de la península de Yucatán desde más de 4000 años. Varios estudios paleoecológicos muestran actividades de agricultura, el registro polínico más antiguo de maíz (Zea mays L.) proviene del norte de Belice, con una edad aproximada de 3300 BC. Otros estudios paleoecológicos del norte de Guatemala y de la porción mexicana de la península de Yucatán muestran registros de maíz fósil con rangos de edad desde 1500 a 3000 A.C. La mayoría de los registros muestran una marcada tendencia a condiciones de mayor sequía después de los 3500 A.C. Estas tendencias de sequía se registran como reducción del polen fósil arbóreo. El registro polínico de Z. mays está acompañado de taxa que indican diferentes grados de perturbación en la vegetación natural.

Resumen en inglés

Human activities have changed and shaped landscape conditions of the Yucatán Peninsula for more than 4000 years. Several paleoecological studies showed the oldest pollen record of corn-based agriculture is from northern Belize, with an estimated age of 3300 BC. Several other studies report maize between 1500 and 3000 BC from northern Guatemala and the Mexican part of the Yucatán Peninsula. After 3500 cal yr BP several paleoecological studies showed a marked tendency to drier climatic conditions. In pollen records, increased drought is expressed as a reduced presence of fossil arboreal pollen. Pollen records with the presence of Zea mays also show other taxa, which are indicators of disturbance in different vegetation types.


5.
Tesis - Maestría
Análogos modernos y paleoecología en la Península de Yucatán / Alejandro Antonio Vela Pelaez
Vela Pelaez, Alejandro Antonio ; Torrescano Valle, Nuria (directora) ; Islebe, Gerald A. (asesor) ; Mas, Jean François (asesor) ; Weissenberger, Holger (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2015
Clasificación: TE/560.45097264 / V45
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SIBE Campeche
ECO040006145 (Disponible)
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SIBE Chetumal
ECO030008327 (Disponible)
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SIBE San Cristóbal
ECO010018015 (Disponible)
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SIBE Tapachula
ECO020013402 (Disponible)
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ECO050005954 (Disponible)
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PDF
Índice | Resumen en: Español |
Resumen en español

La falta de conocimiento de la historia ambiental de los ecosistemas dificulta la comprensión de la interacción entre el clima y la vegetación. Por tal motivo el presente estudio tiene como objetivo reconstruir temporalmente la historia de la vegetación del Holoceno medio-tardío, últimos 7900 años antes del presente (AP), al suroeste de la Península de Yucatán. Por medio del uso de técnicas de calibración empleando la lluvia de polen actual y polen fósil, técnica de análogos modernos y análisis de componentes principales. En el cual se identificó periodos y fechas de cambio (sequías) para el 3200, 2200-200, 1250- 1100 y 550 años AP las cuales concuerdan con periodos registrados en la literatura sobre eventos climáticos importantes e impacto humano. Así como también, cuales son los taxones de mayor dominancia en el ensamble polínico de los nueve tipos de vegetación registrados.

Índice

Índice
Resumen
Introducción
Antecedentes
Justificación
Preguntas de investigación
Objetivo general
Objetivos específicos
Artículo sometido
Conclusiones
Referencias bibliográficas