Demografía y transformación territorial: medio siglo de cambio en la región amazónica de Ecuador/ Demography and territorial transformation: half a century of change in the Amazonian Region of Ecuador

Jarrín‐V, Pablo; Carrillo, Luis Tapia; Zamora, Giannina

doi:10.17141/eutopia.12.2017.2913

Cited by 7 publications

(5 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These future studies should also allow us to gather a more complete overview of the impacts of roads on wildlife in the Western Amazon, and indicate the extent and severity of this problem in this hyperdiverse but understudied region of the Neotropics. How we deal with the challenges of development and urban encroachment (Jarrín-V., Tapia Carrillo, & Zamora, 2017) depends mostly on locally generated information like the one provided in this study.…”

Section: Discussionmentioning

confidence: 99%

Wildlife roadkill patterns in a fragmented landscape of the Western Amazon

Filius

Hoek

Jarrín‐V

et al. 2020

Ecology and Evolution

View full text Add to dashboard Cite

One of the most evident and direct effects of roads on wildlife is the death of animals by vehicle collision. Understanding the spatial patterns behind roadkill helps to plan mitigation measures to reduce the impacts of roads on animal populations. However, although roadkill patterns have been extensively studied in temperate zones, the potential impacts of roads on wildlife in the Neotropics have received less attention and are particularly poorly understood in the Western Amazon. Here, we present the results of a study on roadkill in the Amazon region of Ecuador; a region that is affected by a rapidly increasing development of road infrastructure. Over the course of 50 days, in the wet season between September and November 2017, we searched for road‐killed vertebrates on 15.9 km of roads near the city of Tena, Napo province, for a total of 1,590 surveyed kilometers. We recorded 593 dead specimens, predominantly reptiles (237 specimens, 40%) and amphibians (190, 32%), with birds (102, 17%) and mammals (64, 11%) being less common. Recorded species were assigned to three functional groups, based on their movement behavior and habitat use (“slow,” “intermediate,” and “fast”). Using Ripley's K statistical analyses and 2D HotSpot Identification Analysis, we found multiple distinct spatial clusters or hotspots, where roadkill was particularly frequent. Factors that potentially determined these clusters, and the prevalence of roadkill along road segments in general, differed between functional groups, but often included land cover variables such as native forest and waterbodies, and road characteristics such as speed limit (i.e., positive effect on roadkill frequency). Our study, which provides a first summary of species that are commonly found as roadkill in this part of the Amazon region, contributes to a better understanding of the negative impacts of roads on wildlife and is an important first step toward conservation efforts to mitigate these impacts.

show abstract

Section: Discussionmentioning

confidence: 99%

Wildlife roadkill patterns in a fragmented landscape of the Western Amazon

Filius

Hoek

Jarrín‐V

et al. 2020

Ecology and Evolution

View full text Add to dashboard Cite

show abstract

“…Esto también repercute en el territorio en sí como en los pueblos nativos que dependen del bosque para su subsistencia (Southgate et al, 2009). En los últimos años la población en la Amazonía se ha incrementado de manera significativa, produciendo intensos procesos de urbanización (Jarrín et al, 2017). Varios pequeños centros poblados se han consolidado como centros dotadores de servicios, generando así un mayor dinamismo económico (Bayón, 2019;Wilson & Bayón, 2017).…”

Section: Impactos Antrópicos Sobre La Amazoníaunclassified

Cambio de uso de suelo en la Amazonía norte del Ecuador:un análisis a través de imágenes satelitales nocturnas VIIRS e imágenes LANDSAT

Mejía

Orellana²,

Cabrera-Barona

2021

UDAVER

View full text Add to dashboard Cite

Se ha visto que estos últimos años las presiones sobre el territorio y los pueblos amazónicos se han vuelto cada vez más visibles debido a las transformaciones del suelo y las dinámicas territoriales sobre estas zonas antes consideradas remotas y en las que habitan pueblos primigenios. Frente a este contexto, se ha querido cuantificar los cambios en el territorio por actividades antrópicas cuantificando las transformaciones del suelo y los impactos sobre suelo no artificializado. En este sentido, se emplean imágenes satelitales nocturnas y diurnas que nos permiten cuantificar la evolución de los niveles de radiancia y los cambios en los NDVI. Estos dos indicadores nos permiten visualizar de manera clara las trasformaciones en los usos del suelo y los impactos de radiancia sobre el territorio. En este sentido, se ha corroborado que los impactos vinculados con la expansión de la frontera agrícola y urbana incrementan anualmente sus superficies a tasas que superan los 4,5% y que las actividades antrópicas se vinculan con las temperaturas más elevadas del territorio propiciando un cambio de las características propias de los ecosistemas selváticos. Estos resultados evidencian la perdida de bosques tropicales, pero también y los impactos sobre los pueblos primigenios que habitan estos territorios. Palabras clave: Landsat, VIIRS, cambio de suelo, NDVI, Amazonía. AbstractIn the last years the pressures on the Amazon have increasingly become visible due to the transformations of the land and alteration of territorial dynamics in areas previously considered remote and only inhabited by indigenous nations. In this context, we evaluate anthropic-based changes by quantifying the transformations of land use and the impacts on non-artifcialized areas. Using night and day satellite images, we quantify the evolution of radiance levels and changes in NDVI since 2012. We obtained a visualization of the transformations in land use and the radiance impacts on the territory. In this sense, this study found that the impacts related tothe expansion of the agricultural and urban frontier increase their infuence areas at rates that exceed 4.5%/year and that anthropic activities are linked to the highest temperatures in the territory, motivating a change of the characteristics of rainforest ecosystems. These results show the loss of tropical forests, but also suggests impacts on the indigenous inhabitants of these territories. Keywords: Landsat, VIIRS, soil change, NDVI, Amazon.

show abstract

“…Our second proposal to adjust the BAU trend scenario is to integrate population growth dynamics into the transition probability matrix, to make it more realistic. Indeed, population growth is often considered as a major driver of deforestation in the world, in Latin America and especially in NEA (Preston 1996;Armenteras et al 2017;Jarrín-V. et al 2017).…”

Section: Bau-bmentioning

confidence: 99%

Improving Business-as-Usual Scenarios in Land Change Modelling by Extending the Calibration Period and Integrating Demographic Data

Mejean

Paegelow

Saqalli

et al. 2019

Lecture Notes in Geoinformation and Cartography

View full text Add to dashboard Cite

Land use and land cover change (LUCC) models are increasingly being used to anticipate the future of territories, particularly through the prospective scenario method. In the case of so-called trend or Business-as-Usual (BAU) scenarios, the aim is to observe the current dynamics and to extend them into the future. However, as they are implemented as baseline simulation in most current software packages, BAU scenarios are calibrated from a training period built from only two dates. We argue that this limits the quantitative estimation of future change intensity, and we illustrate it from a simple model of deforestation in Northern Ecuadorian Amazon using the Land Change Modeler (LCM) software package. This paper proposes a contribution to improve BAU scenarios calibration by mainly two enhancements: taking into account a longer calibration period for estimating change quantities and the integration of thematic data in change probabilities matrices. We thus demonstrate the need to exceed the linear construction of BAU scenarios as well as the need to integrate thematic and particularly socio-demographic data into the estimation of future quantities of change. The spatial aspects of our quantitative adjustments are discussed and tend to show that improvements in the quantitative aspects should not be dissociated from an improvement in the spatial allocation of changes, which may lead to a decrease in the predictive accuracy of the simulations.

show abstract

Demografía y transformación territorial: medio siglo de cambio en la región amazónica de Ecuador/ Demography and territorial transformation: half a century of change in the Amazonian Region of Ecuador

Cited by 7 publications

References 28 publications

Wildlife roadkill patterns in a fragmented landscape of the Western Amazon

Wildlife roadkill patterns in a fragmented landscape of the Western Amazon

Cambio de uso de suelo en la Amazonía norte del Ecuador:un análisis a través de imágenes satelitales nocturnas VIIRS e imágenes LANDSAT

Improving Business-as-Usual Scenarios in Land Change Modelling by Extending the Calibration Period and Integrating Demographic Data

Contact Info

Product

Resources

About