Bryan G. Valencia
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View article: The Evolution of Agrarian Landscapes in the Tropical Andes
The Evolution of Agrarian Landscapes in the Tropical Andes Open
Changes in land-use practices have been a central element of human adaptation to Holocene climate change. Many practices that result in the short-term stabilization of socio-natural systems, however, have longer-term, unanticipated consequ…
View article: Análisis de susceptibilidad a deslizamientos empleando el proceso de jerarquía analítica en una carretera Amazónica del Ecuador
Análisis de susceptibilidad a deslizamientos empleando el proceso de jerarquía analítica en una carretera Amazónica del Ecuador Open
The Puyo-Tena roadway is prone to landslides due to the geodynamics, geomorphology, and geological materials of the area (unstable outcrops and strata). In recent years, this problem has persistently caused the road to be partially or comp…
View article: A neotropical perspective on the uniqueness of the Holocene among interglacials
A neotropical perspective on the uniqueness of the Holocene among interglacials Open
Understanding how tropical systems have responded to large-scale climate change, such as glacial-interglacial oscillations, and how human impacts have altered those responses is key to current and future ecology. A sedimentary record recov…
View article: A palaeoecological perspective on the transformation of the tropical Andes by early human activity
A palaeoecological perspective on the transformation of the tropical Andes by early human activity Open
Palaeoecological records suggest that humans have been in the Andes since at least 14 000 years ago. Early human impacts on Andean ecosystems included an increase in fire activity and the extinction of the Pleistocene megafauna. These chan…
View article: A new method for microplastic sampling and isolation in mountain glaciers: A case study of one antisana glacier, Ecuadorian Andes
A new method for microplastic sampling and isolation in mountain glaciers: A case study of one antisana glacier, Ecuadorian Andes Open
Microplastic contamination has become ubiquitous in terrestrial and marine environments. Recent studies have shown that the wind can transport and deposit microplastics in high mountain ecosystems, but microplastic contamination therein is…
View article: A 12,700-year history of paleolimnological change from an Andean microrefugium
A 12,700-year history of paleolimnological change from an Andean microrefugium Open
We present a 12,6700-yr limnological history of Lake Miski, a high-elevation lake in a wet section of the Peruvian Andes. While many shallow Andean lakes dried up during the mid-Holocene, loss-on-ignition, magnetic susceptibility, and diat…
View article: <i>Polylepis</i>woodland dynamics during the last 20,000 years
<i>Polylepis</i>woodland dynamics during the last 20,000 years Open
Aim To determine the palaeoecological influences of climate change and human land use on the spatial distribution patterns of Polylepis woodlands in the Andes. Location Tropical Andes above 2,900 m between 2°S and 18°S of latitude. Methods…
View article: The ACER pollen and charcoal database: a global resource to document vegetation and fire response to abrupt climate changes during the last glacial period
The ACER pollen and charcoal database: a global resource to document vegetation and fire response to abrupt climate changes during the last glacial period Open
Quaternary records provide an opportunity to examine the nature of the vegetation and fire responses to rapid past climate changes comparable in velocity and magnitude to those expected in the 21st-century. The best documented examples of …
View article: The ACER pollen and charcoal database: a global resource to document vegetation and fire response to abrupt climate changes during the last glacial period
The ACER pollen and charcoal database: a global resource to document vegetation and fire response to abrupt climate changes during the last glacial period Open
Quaternary records provide an opportunity to examine the nature of the vegetation and fire responses to rapid past climate changes comparable in velocity and magnitude to those expected in the 21st century. The best documented examples of …
View article: BUMPER v1.0: a Bayesian user-friendly model for palaeo-environmental reconstruction
BUMPER v1.0: a Bayesian user-friendly model for palaeo-environmental reconstruction Open
We describe the Bayesian user-friendly model for palaeo-environmental reconstruction (BUMPER), a Bayesian transfer function for inferring past climate and other environmental variables from microfossil assemblages. BUMPER is fully self-cal…
View article: The ACER pollen and charcoal database
The ACER pollen and charcoal database Open
Quaternary records provide an opportunity to examine the nature of the vegetation and fire responses to rapid past climate changes comparable in velocity and magnitude to those expected in the 21st century. The best documented examples of …
View article: BUMPER v1.0: A Bayesian User-friendly Model forPalaeo-Environmental Reconstruction
BUMPER v1.0: A Bayesian User-friendly Model forPalaeo-Environmental Reconstruction Open
We describe the Bayesian User-friendly Model for Palaeo-Environmental Reconstruction (BUMPER), a Bayesian transfer function for inferring past climate from microfossil assemblages. BUMPER is fully self-calibrating, straightforward to apply…
View article: The functional extinction of Andean megafauna
The functional extinction of Andean megafauna Open
Controversy exists over the cause and timing of the extinction of the Pleistocene megafauna. In the tropical Andes, deglaciation and associated rapid climate change began ~8,000 years before human arrival, providing an opportunity to separ…
View article: Andean microrefugia: testing the Holocene to predict the Anthropocene
Andean microrefugia: testing the Holocene to predict the Anthropocene Open
Summary Microrefugia are important for supporting populations during periods of unfavourable climate change and in facilitating rapid migration as conditions ameliorate. With ongoing anthropogenic climate change, microrefugia could have an…
View article: Millennial-scale vegetation changes in the tropical Andes using ecological grouping and ordination methods
Millennial-scale vegetation changes in the tropical Andes using ecological grouping and ordination methods Open
We compare eight pollen records reflecting climatic and environmental change from northern and southern sites in the tropical Andes. Our analysis focuses on the last 30 000 years, with particular emphasis on the Pleistocene to Holocene tra…