José Luis Hernandez-Stefanoni

José Luis Hernandez-Stefanoni
Centro de Investigación Científica de Yucatán | CICY · Unidad de Recursos Naturales

Doctor of Philosophy

About

93
Publications
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3,194
Citations

Publications

Publications (93)
Book
Full-text available
Este libro proporciona una guía para llevar a cabo el mapeo de la biomasa aérea del bosque en grandes superficies relacionando datos de campo con la información derivada de imágenes de satélite. La metodología para el mapeo de esta variable utiliza scripts desarrollados en el lenguaje R, e incluye la estimación de la biomasa en campo, preprocesamie...
Article
Full-text available
Integrating information about the spatial distribution of carbon stocks and species diversity in tropical forests over large areas is fundamental for climate change mitigation and biodiversity conservation. In this study, spatial models showing the distribution of carbon stocks and the number of species were produced in order to identify areas that...
Article
A Landsat images time series and the "Breaks for Additive Season and Trend" algorithm were used to analyze annual deforestation around Mérida City in the last two decades. Before and after deforestation land surface temperatures, estimated from Landsat images, were compared to each other to analyze heat islands in the city. Land surface temperature...
Article
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Spatial information on the timing of forest cover loss is important to identify and map stand age, which is a key factor driving the recovery of carbon pools and can also be used to estimate aboveground biomass (AGB) based on its relationship with stand age. Here, we estimated the spatial distribution of stand age and AGB of young forest (<20 years...
Article
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Resilient secondary tropical forests? Although deforestation is rampant across the tropics, forest has a strong capacity to regrow on abandoned lands. These “secondary” forests may increasingly play important roles in biodiversity conservation, climate change mitigation, and landscape restoration. Poorter et al . analyzed the patterns of recovery i...
Article
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Coffee is one of the most important agricultural commodities of Mexico. Mapping coffee land cover is still a challenge because it is grown mainly on small areas in agroforestry systems (AFS), which are located in hard-to-access mountainous regions. The objective of this research was to map coffee AFS types in a mountainous region using the changing...
Article
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Forests that regrow naturally on abandoned fields are important for restoring biodiversity and ecosystem services, but can they also preserve the distinct regional tree floras? Using the floristic composition of 1215 early successional forests (≤20 years) in 75 human-modified landscapes across the Neotropic realm, we identified 14 distinct floristi...
Article
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Data capturing multiple axes of tree size and shape, such as a tree's stem diameter, height and crown size, underpin a wide range of ecological research - from developing and testing theory on forest structure and dynamics, to estimating forest carbon stocks and their uncertainties, and integrating remote sensing imagery into forest monitoring prog...
Article
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Se presenta un diagnóstico estratégico de la productividad de artículos científicos publicados entre 2010 y 2021 de la Unidad de Recursos Naturales del CICY. Los resultados muestran que se publican entre 9 y 11 artículos por año en cada línea de investigación, que corresponden a 3 artículos por investigador por año. Otra fortaleza está en la formac...
Article
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The recovery of soil conditions is crucial for successful ecosystem restoration and, hence, for achieving the goals of the UN Decade on Ecosystem Restoration. Here, we assess how soils resist forest conversion and agricultural land use, and how soils recover during subsequent tropical forest succession on abandoned agricultural fields. Our overarch...
Article
Significance Tropical forests disappear rapidly through deforestation but also have the potential to regrow naturally through a process called secondary succession. To advance successional theory, it is essential to understand how these secondary forests and their assembly vary across broad spatial scales. We do so by synthesizing continental-scale...
Article
Information on the spatial distribution of forest aboveground biomass (AGB) and its uncertainty is important to evaluate management and conservation policies in tropical forests. However, the scarcity of field data and robust protocols to propagate uncertainty prevent a robust estimation through remote sensing. We upscaled AGB from field data to Li...
Article
Aim.- Optical satellite imagery and has been used for mapping the spatial distribution of vegetation structure attributes; however, obtaining accurate estimates with optical imagery can be difficult in tropical forests due to their dense canopy and multi‐layered vegetation. Synthetic aperture radar imagery can be more suitable in this case, as the...
Article
Full-text available
The urgency to preserve tropical forest remnants has encouraged the development of remote sensing tools and techniques to monitor diverse forest attributes for management and conservation. State-of-the-art methodologies for mapping and tracking these attributes usually achieve accuracies greater than 0.8 for forest cover monitoring; r-square values...
Article
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Climate change has severe consequences on ecosystem processes, as well as on people's quality of life. It has been suggested that the loss of vegetation cover increases the land surface temperature (LST) due to modifications in biogeochemical patterns, generating a phenomenon known as "urban heat island" (UHI). The aim of this work was to analyze t...
Article
Full-text available
Land use changes generate a mosaic of forest patches with different ages of abandonment (i.e. succession) intermingled with other land uses. Mapping the successional age of vegetation is crucial to understand carbon accumulation patterns and the recovery of vegetation structure, diversity, and composition of forests over time. The overall objective...
Article
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In tropical dry forests, deciduousness (i.e., leaf shedding during the dry season) is an important adaptation of plants to cope with water limitation, which helps trees adjust to seasonal drought. Deciduousness is also a critical factor determining the timing and duration of carbon fixation rates, and affecting energy, water, and carbon balance. Th...
Article
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Background: Reliable information about the spatial distribution of aboveground biomass (AGB) in tropical forests is fundamental for climate change mitigation and for maintaining carbon stocks. Recent AGB maps at continental and national scales have shown large uncertainties, particularly in tropical areas with high AGB values. Errors in AGB maps a...
Article
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Después de pasar la cuarentena por COVID-19, en diversos países se comienza a hablar de la "nueva normalidad" y las medidas que conlleva como "lavarse las manos continuamente", tan seguido como sea posible; "mantenernos a una distancia mínima de dos metros con respecto a los demás"; "usar gel con alta concentración de alcohol", o el "uso de cubrebo...
Article
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Spatial and temporal variation of the physical and chemical conditions of coastal karst wetland ecosystems, which annually range from flooded to completely dry, generate a very dynamic fish community structure. We assessed the relative influence of spatial dependence and environmental factors on fish community structure in a seasonally flooded trop...
Article
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¿Son el desarrollo y la expansión de los asentamientos humanos la clave para incrementar la calidad de vida de los habitantes y de las nuevas generaciones? En este artículo, evaluamos desde una perspectiva geográfica la expansión de la periferia urbana en dos áreas del noroeste de la Ciudad de Mérida, Yucatán, México, durante el período comprendido...
Article
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Tree density, species richness, and composition drive vegetation patches identified from remotely-sensed data in a semi evergreen tropical forest. A proposal for characterizing habitat of forests, obtained from an object-oriented classification of RapidEye multiespectral imagery, based on dissimilarity matrices of vegetation structure, species dive...
Article
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A proposal for characterizing habitat of forests, obtained from an object-oriented classification of a RapidEye multiespectral imagery, based on dissimilarity matrices of vegetation structure, species diversity and composition is presented. The study area is a forested landscape mosaic after slash and burn agriculture (Ac: 8-23 years ago), selectiv...
Article
Knowledge of the spatial distribution of aboveground biomass (AGB) is crucial to guide forest conservation and management to maintain carbon stocks. LiDAR has been highly successful for this purpose, but has limited availability. Very-high resolution (<1m) orthophotos can also be used to estimate AGB because they allow a fine distinction of forest...
Article
Tropical forests are converted at an alarming rate for agricultural use and pastureland, but also regrow naturally through secondary succession. For successful forest restoration, it is essential to understand the mechanisms of secondary succession. These mechanisms may vary across forest types, but analyses across broad spatial scales are lacking....
Article
Full-text available
Tree beta-diversity denotes the variation in species composition at stand level, it is a key indicator of forest degradation, and is conjointly required with alpha-diversity for management decision making but has seldom been considered. Our aim was to map it in a continuous way with remote sensing technologies over a tropical landscape with differe...
Article
Full-text available
Tropical forests are converted at an alarming rate for agricultural use and pastureland, but also regrow naturally through secondary succession. For successful forest restoration, it is essential to understand the mechanisms of secondary succession. These mechanisms may vary across forest types, but analyses across broad spatial scales are lacking....
Article
Full-text available
El mapeo de la distribución espacial de la diversidad de plantas y la biomasa aérea es de vital importancia, ya que esta información puede ser utilizada para la planeación de ac-tividades, encaminadas a mantener la biodiversidad y las reservas de carbono de los bosques tropicales. Los sistemas de sensores remotos multiespectrales, se encuentran ent...
Article
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Old-growth tropical forests harbor an immense diversity of tree species but are rapidly being cleared, while secondary forests that regrow on abandoned agricultural lands increase in extent. We assess how tree species richness and composition recover during secondary succession across gradients in environmental conditions and anthropogenic disturba...
Article
Tropical dry forests provide goods and ecosystem services that rely on their diversity and are vital for human wellbeing. However, they are among the most threatened ecosystems due mainly to conversion to agriculture. Accurate estimations of species diversity in tropical secondary forests are needed for effective conservation and forest management....
Article
Tracking the occurrence of deforestation events is an essential task in tropical dry forest (TDF) conservation efforts. Ideally, deforestation monitoring systems would identify a TDF clearing with near real time precision and high spatial detail, and alert park managers and environmental practitioners of illegal forest clearings occurring anywhere...
Article
Modelización y mapeo estacional del índice de área foliar en un bosque tropical seco usando imágenes de satélite de alta resolución Modeling of seasonal leaf area index values in a tropical dry forest using high resolution satellite imagery Resumen El índice de área foliar (IAF) proporciona información acerca de la cantidad de superficie fotosintét...
Preprint
Full-text available
Modelización y mapeo estacional del índice de área foliar en un bosque tropical seco usando imágenes de satélite de alta resolución Modeling of seasonal leaf area index values in a tropical dry forest using high resolution satellite imagery Resumen El índice de área foliar (IAF) proporciona información acerca de la cantidad de superficie fotosintét...
Article
Full-text available
Accurate estimates of above ground biomass (AGB) are needed for monitoring carbon in tropical forests. LiDAR data can provide precise AGB estimations because it can capture the horizontal and vertical structure of vegetation. However, the accuracy of AGB estimations from LiDAR is affected by a co-registration error between LiDAR data and field plot...
Article
Full-text available
The nutrient demands of regrowing tropical forests are partly satisfied by nitrogen-fixing legume trees, but our understanding of the abundance of those species is biased towards wet tropical regions. Here we show how the abundance of Leguminosae is affected by both recovery from disturbance and large-scale rainfall gradients through a synthesis of...
Article
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In this study we compared two alternative methodological approaches, namely moving-window metrics and surface metrics (image texture) for predicting richness of several plant groups (all species, legume species, legume trees, legume shrubs, legume forbs, legume climbers) across a tropical landscape in Mexico. We concluded that the prediction of spe...
Article
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La ecología estudia la influencia que los patrones ambientales tienen sobre los procesos ecológicos. Es bien conocido que los patrones y procesos ecológicos operan en un amplio rango de escalas espaciales y temporales. Por lo tanto, para encontrar las relaciones entre los organismos y el ambiente y poder extrapolar esta información ecológica y esta...
Article
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Determining which factors affect species richness is important for conservation theory and practice. However, richness of common and rare species may be affected by different factors. We use an extensive inventory of woody plants from a tropical dry forest landscape in Yucatan, Mexico to assess the unique effects of environmental variables, spatial...
Article
Full-text available
Contar con información detallada sobre la distribución de la diversidad biológica y la composición de especies, es esencial para establecer estrategias efectivas de conserva-ción y manejo de la biodiversidad en los bosques tropicales. La percepción remota ofrece información con una cobertura espacial completa, en superficies grandes y en intervalos...
Article
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The magnitude of the carbon sink in second-growth forests is expected to vary with successional biomass dynamics resulting from tree growth, recruitment, and mortality, and with the effects of climate on these dynamics. We compare aboveground biomass dynamics of dry and wet Neotropical forests, based on monitoring data gathered over 3–16 years in f...
Article
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Old-growth tropical forests are increasingly vanishing worldwide. Although the accurate quantification of tropical old-growth forests attributes is essential to understand, manage, and conserve their high diversity and biomass, conducting this task over large areas and at fine detail is not only expensive and time consuming, but also often practica...
Poster
Full-text available
Se presenta un modelo estadístico de la intrusión salina y la estructura que la define en el acuífero al norte de Yucatán. La metodología está basada en técnicas de resistividad eléctrica y electromagnética con las que se obtienen modelos de resistividad del terreno en 1D-2D y la aplicación de modelos estadísticos de estimación. Los resultados mues...
Article
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Drones hay de todos, para todos los gustos y, sin duda, llegaron para quedarse. Desde sus primeros usos en la industria militar, hoy día vemos el uso masivo de estos vehícu-los aéreos no tripulados con fines recreativos y hasta para video filmaciones de eventos sociales. Sin embargo, el uso de los drones abre nuevas perspectivas para la colecta de...
Article
Full-text available
Regrowth of tropical secondary forests following complete or nearly complete removal of forest vegetation actively stores carbon in aboveground biomass, partially counterbalancing carbon emissions from deforestation, forest degradation, burning of fossil fuels, and other anthropogenic sources. We estimate the age and spatial extent of lowland secon...
Article
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Tropical dry forests (TDF) are subject to intense human intervention leading to an increase of secondary forests and changes in habitat suitability for birds. Despite the increasing research on secondary forests, we have little understanding of how such changes in tropical dry forests have affected animal communities.The main goal of this research...
Article
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Land-use change occurs nowhere more rapidly than in the tropics, where the imbalance between deforestation and forest regrowth has large consequences for the global carbon cycle. However, considerable uncertainty remains about the rate of biomass recovery in secondary forests, and how these rates are influenced by climate, landscape, and prior land...
Article
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Caribbean coral reefs are under strong natural and human pressures and many have undergone phase shifts as a result of local and global change. However few studies have quantified the extent of these phase shifts and the potential impacts that they have on coral reef communities. A temporal comparative analysis of several coral reefscape and landsc...
Article
QuestionsIs the accuracy of predictions of above-ground biomass (AGB) and plant species richness of tropical dry forests from LIDAR data compromised during leaf-off canopy period, when most of the vegetation is leafless, compared to the leaf-on period? How does topographic position affect prediction accuracy of AGB for leaf-off and leaf-on canopy c...
Article
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1.Successional gradients are ubiquitous in nature, yet few studies have systematically examined the evolutionary origins of taxa that specialize at different successional stages. Here we quantify successional habitat specialization in Neotropical forest trees and evaluate its evolutionary lability along a precipitation gradient. Theoretically, succ...
Article
Many geospatial tools have been advocated in spatial ecology to estimate biodiversity and its changes over space and time. Such information is essential in designing effective strategies for biodiversity conservation and management. Remote sensing is one of the most powerful approaches to identify biodiversity hotspots and predict changes in specie...
Article
Full-text available
The spatial distribution of plant diversity and biomass informs management decisions to maintain biodiversity and carbon stocks in tropical forests. Optical remotely sensed data is often used for supporting such activities; however, it is difficult to estimate these variables in areas of high biomass. New technologies, such as airborne LiDAR, have...
Chapter
Previous studies have emphasized the importance of including not only the potential and costs of different land use/land cover alterna