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Journal articles on the topic 'Antisana'

Author: Grafiati

Published: 4 June 2025

Last updated: 14 July 2025

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1

Rios, Maria Cristina, and Héctor Cadena-Ortiz. "DIETA DEL BÚHO CORONADO Bubo virginianus (STRIGIDAE) EN LA LADERA OCCIDENTAL DEL VOLCÁN ANTISANA, ECUADOR." Revista Ecuatoriana de Ornitología 11, no. 1 (2025): 59–65. https://doi.org/10.18272/a1xpxy21.

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The Great Horned Owl (Bubo virginianus) is the largest nocturnal bird of prey in the Neotropics. In Ecuador, its ecology is little known. We collected 89 pellets and 38.2 g of disintegrated material in the perch of two adult individuals, in the paramos of the western slopes of the Antisana volcano. We identified 197 preys belonging to seven taxa. Phyllotis haggardi was the most common prey (61%), and Sylvilagus andinus was the one that contributed the greatest biomass (84.9%). Phyllotis haggardi, Cryptotis osgoodi, and Microryzomys altissimus were previously unlisted prey in this owl's diet. B. virginianus in the paramos of the western slopes of the Antisana volcano showed a specialist diet and a selective foraging strategy.

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Rios, Maria Cristina, and Héctor Cadena-Ortiz. "DIETA DEL BÚHO CORONADO Bubo virginianus (STRIGIDAE) EN LA LADERA OCCIDENTAL DEL VOLCÁN ANTISANA, ECUADOR." Revista Ecuatoriana de Ornitología 11, no. 1 (2025): 59–65. https://doi.org/10.18272/reo.v11i1.3328.

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The Great Horned Owl (Bubo virginianus) is the largest nocturnal bird of prey in the Neotropics. In Ecuador, its ecology is little known. We collected 89 pellets and 38.2 g of disintegrated material in the perch of two adult individuals, in the paramos of the western slopes of the Antisana volcano. We identified 197 preys belonging to seven taxa. Phyllotis haggardi was the most common prey (61%), and Sylvilagus andinus was the one that contributed the greatest biomass (84.9%). Phyllotis haggardi, Cryptotis osgoodi, and Microryzomys altissimus were previously unlisted prey in this owl's diet. B. virginianus in the paramos of the western slopes of the Antisana volcano showed a specialist diet and a selective foraging strategy.

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Cadena-Ortiz, Héctor, María Fernanda Solórzano, Mishell Noboa, and Jorge Brito. "Diet of the Short-Eared Owl (Asio flammeus) in the Antisana highlands, Ecuador." Huitzil, Revista Mexicana de Ornitología 20, no. 2 (2019): 1–5. http://dx.doi.org/10.28947/hrmo.2019.20.2.436.

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El conocimiento de la dieta de una especie es un elemento importante para entender su historia natural y ecología, la información sobre la dieta de los búhos ecuatorianos ha ido aumentando paulatinamente. Analizamos n = 163 egagrópilas del búho orejicorto (Asio flammeus) colectadas en el páramo del Antisana, norte de Ecuador. Encontramos 242 presas correspondientes a seis taxones; el conejo andino Sylvilagus andinus fue la presa más importante en frecuencia (46%) y aporte de biomasa (78%). La dieta del búho orejicorto presentó una baja riqueza de especies en el páramo de Antisana, posiblemente relacionada a una especialización individual o a la baja disponibilidad de presas sobre los 4,000 m. Al igual que en estudios previos sobre la dieta de la especie, los mamíferos fueron la presa que dominó en frecuencia y biomasa.

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Medina-Torres, Byron, Mathieu Jonard, Melina Rendón, and Anne-Laure Jacquemart. "Effects of Pine Plantation on Native Ecuadorian Páramo Vegetation." Forests 13, no. 9 (2022): 1499. http://dx.doi.org/10.3390/f13091499.

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Exotic pine plantations, installed mainly for timber production and carbon sequestration purposes, cover an ever-expanding area of equatorial and tropical regions; however, their economic and environmental benefits are under debate due to their potential negative effects on native plant species conservation. The native understory plant species richness and cover under pine (Pinus radiata D. Don) plantations were compared with natural grasslands in the Ecuadorian Páramo. We analyzed the vegetation in four zones: Antisana (8-year-old pines), Cajas (16-year-old pines), Tisaleo (41-year-old pines) and Cotopaxi (53-year-old pines). The total understory plant cover decreased between 29% and 90% under pine plantations in all zones. The mean species richness in the pine plantations decreased by 44% in Antisana, Cajas and Tisaleo but not in Cotopaxi. Pine plantations strongly reduced the abundance of herbaceous light-demanding species (59%), except small herbs whose cover increased under pine (17.6%). Shrub cover was also negatively affected in Tisaleo and Cotopaxi (7.4%). Pine afforestation effects on Páramo vegetation depend mainly on canopy cover which changes with age and growing conditions (altitude) and secondarily on the vegetation state at the time of planting, resulting from land use history and ecological conditions. The pine effect was therefore more pronounced in the young and dense plantations of Antisana and Cajas than in the old and open stand of Cotopaxi, whose understory vegetation was more similar to that of grasslands.

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Morueta-Holme, Naia, Kristine Engemann, Pablo Sandoval-Acuña, Jeremy D. Jonas, R. Max Segnitz, and Jens-Christian Svenning. "Resurvey of Antisana supports overall conclusions of Chimborazo study." Proceedings of the National Academy of Sciences 116, no. 43 (2019): 21346–47. http://dx.doi.org/10.1073/pnas.1911597116.

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6

Valladares Borja, Mauricio. "Estudio de la variabilidad espacial y temporal de los glaciares y ecosistemas locales del Volcán Antisana." Enfoque UTE 5, no. 4 (2014): 1–16. http://dx.doi.org/10.29019/enfoqueute.v5n4.44.

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(Recibido: 2014/10/31 - Aceptado: 2014/12/15)El interés científico sobre el cambio climático permitió descubrir evidencias que demuestran una tendencia de calentamiento general provocada por las actividades que desarrolla el ser humano. Hechos como el aumento del nivel del mar, eventos meteorológicos extremos y el retroceso de glaciares, constituyen indicadores de la presencia de modificaciones de los patrones climáticos normales. En el Ecuador, el volcán Antisana es un estrato volcán de importancia estratégica que influye en el clima de la región, en el funcionamiento de los ecosistemas locales y también constituye una reserva de agua para la población del Distrito Metropolitano de Quito (DMQ). Los glaciares de este volcán tropical también sufren los efectos del calentamiento global cuya disminución a lo largo del tiempo es motivo de preocupación y análisis. El presente trabajo de investigación consistió en realizar el estudio espacial y temporal basado en series históricas de fotografías aéreas obtenidas entre los años de 1956 y 2011, a través de las capacidades de geo-procesamiento de los sistemas de información geográfica (SIG). Los resultados obtenidos demuestran una disminución significativa de los glaciares del Volcán Antisana e importantes cambios en las formaciones ecológicas locales circundantes.

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7

Sklenar, Petr, and Katya Romoleroux. "Werneria spathulata, nuevo registro para la flora del Ecuador, y redescubrimiento de Xenophyllum acerosum." Caldasia 43, no. 1 (2020): 214–17. http://dx.doi.org/10.15446/caldasia.v43n1.81909.

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Se presenta un nuevo reporte de Werneria (Asteraceae) para Ecuador, es W. spathulata, una pequeña hierba rizomatosa encontrada en los páramos del volcán Antisana. Además, se documenta el redescubrimiento de Xenophyllum acerosum en el Ecuador después de su primera colección hace 73 años en la provincia de Azuay. Se proveen fotografías del hábito de las dos especies, así como del hábitat donde fueron halladas.

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8

Chamorro, Susana, Jennifer Moyón, Franks Araya, et al. "The ecology of diatoms inhabiting cryoconite holes in Antisana Glacier, Ecuador." Journal of Glaciology 68, no. 267 (2021): 204–8. http://dx.doi.org/10.1017/jog.2021.108.

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AbstractIn the ablation zone of glacier habitats, cryoconite holes are known to harbor diverse microbial communities, including unique diatom floras distinct from those of surrounding aquatic and terrestrial systems. Besides descriptive studies, little is known about the diversity of cryoconite diatoms and their response to environmental stressors, particularly in low-latitude glaciers. This paper documents an extremely diversified diatom community in Antisana Glacier (Ecuador), reporting 278 taxa found in 54 surface holes, although with low individual abundances. Contrary to our expectations, assemblage structure did not respond to water physical or chemical characteristics, nor to cryoconite hole morphology, but to elevation. We demonstrate that elevation is a driver of diatom assemblages. Both alpha diversity (measured as Fisher's index) and species richness (corrected for unequal sample sizes) correlated negatively with elevation, suggesting a replacement toward simplified, poorer communities along this gradient. The taxonomic composition also changed significantly, as revealed by multivariate statistics. In summary, cryoconite holes are sites of high taxonomic diversity composed of taxa that are allochthonous in origin.

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9

Chamorro, Susana, Jennifer Moyón, Franks Araya, et al. "The ecology of diatoms inhabiting cryoconite holes in Antisana Glacier, Ecuador." Journal of Glaciology 68, no. 267 (2021): 204–8. http://dx.doi.org/10.1017/jog.2021.108.

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AbstractIn the ablation zone of glacier habitats, cryoconite holes are known to harbor diverse microbial communities, including unique diatom floras distinct from those of surrounding aquatic and terrestrial systems. Besides descriptive studies, little is known about the diversity of cryoconite diatoms and their response to environmental stressors, particularly in low-latitude glaciers. This paper documents an extremely diversified diatom community in Antisana Glacier (Ecuador), reporting 278 taxa found in 54 surface holes, although with low individual abundances. Contrary to our expectations, assemblage structure did not respond to water physical or chemical characteristics, nor to cryoconite hole morphology, but to elevation. We demonstrate that elevation is a driver of diatom assemblages. Both alpha diversity (measured as Fisher's index) and species richness (corrected for unequal sample sizes) correlated negatively with elevation, suggesting a replacement toward simplified, poorer communities along this gradient. The taxonomic composition also changed significantly, as revealed by multivariate statistics. In summary, cryoconite holes are sites of high taxonomic diversity composed of taxa that are allochthonous in origin.

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10

Farrona, Ana Mª M., Fernando Domínguez-Castro, Mª Cruz Gallego, and José M. Vaquero. "The first meteorological observations at a tropical high elevation site: Antisana, 1846." Journal of Mountain Science 13, no. 6 (2016): 1047–55. http://dx.doi.org/10.1007/s11629-015-3795-0.

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11

Castellanos, Armando, and Leopoldo Gomez. "Reintroduced Andean Tapir Attacks a Person in the Antisana Ecological Reserve, Ecuador." Tapir Conservation 24 (August 3, 2015): 11–12. https://doi.org/10.5281/zenodo.23408.

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The mountain tapir (<em>Tapirus pinchaque</em>) is often perceived as a peaceful and quiet animal. This view has been re-enforced by domestication accounts that suggest mountain tapirs can be very docile and friendly after a relatively short time (Crandall, 1964; Gale and Sedgwick, 1968). However, wild tapirs are known to occasionally display aggressive behaviour, which when directed towards humans can cause dangerously deep wounds (Schauenberg, 1969). In our own work, we have observed aggressive behavior by females protecting their calves. (Castellanos, 1994; Downer, 1996; Castellanos, 2013). Farmers have also reported observing tapirs displaying similarly aggressive behavior when defending themselves from Andean bear predators (<em>Tremarctos ornatus</em>). Finally, it has been also been reported that male mountain tapirs can fight fiercely among themselves inflicting deep bites on ears and hind limbs (Schauenberg, 1969). We do not understand what triggers such behaviour, nor whether such behavior is common in the species, or if it is a trait that varies across individuals. 

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12

Moret, Pierre, Priscilla Muriel, Ricardo Jaramillo, and Olivier Dangles. "Humboldt’sTableau Physiquerevisited." Proceedings of the National Academy of Sciences 116, no. 26 (2019): 12889–94. http://dx.doi.org/10.1073/pnas.1904585116.

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Alexander von Humboldt’sTableau Physique(1807) has been one of the most influential diagrams in the history of environmental sciences. In particular, detailed observations of the altitudinal distribution of plant species in the equatorial Andes, depicted on a cross-section of Mt. Chimborazo, allowed Humboldt to establish the concept of vegetation belt, thereby laying the foundations of biogeography. Surprisingly, Humboldt’s original data have never been critically revisited, probably due to the difficulty of gathering and interpreting dispersed archives. By unearthing and analyzing overlooked historical documents, we show that the top section of theTableau Physique, above the tree line, is an intuitive construct based on unverified and therefore partly false field data that Humboldt constantly tried to revise in subsequent publications. This finding has implications for the documentation of climate change effects in the tropical Andes. We found that Humboldt’s primary plant data above tree line were mostly collected on Mt. Antisana, not Chimborazo, which allows a comparison with current records. Our resurvey at Mt. Antisana revealed a 215- to 266-m altitudinal shift over 215 y. This estimate is about twice lower than previous estimates for the region but is consistent with the 10- to 12-m/decade upslope range shift observed worldwide. Our results show the cautious approach needed to interpret historical data and to use them as a resource for documenting environmental changes. They also profoundly renew our understanding of Humboldt’s scientific thinking, methods, and modern relevance.

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Basantes-Serrano, Rubén, Antoine Rabatel, Bernard Francou, et al. "New insights into the decadal variability in glacier volume of a tropical ice cap, Antisana (0°29′ S, 78°09′ W), explained by the morpho-topographic and climatic context." Cryosphere 16, no. 11 (2022): 4659–77. http://dx.doi.org/10.5194/tc-16-4659-2022.

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Abstract. We present a comprehensive study of the evolution of the glaciers on the Antisana ice cap (tropical Andes) over the period 1956–2016. Based on geodetic observations of aerial photographs and high-resolution satellite images, we explore the effects of morpho-topographic and climate variables on glacier volumes. Contrasting behaviour was observed over the whole period, with two periods of strong mass loss, 1956–1964 (−0.72 m w.e. yr−1) and 1979–1997 (−0.82 m w.e. yr−1), and two periods with slight mass loss, 1965–1978 (0.10 m w.e. yr−1) and 1998–2016 (−0.26 m w.e. yr−1). There was a 42 % reduction in the total surface area of the ice cap. Individually, glacier responses were modulated by morpho-topographic variables (e.g. maximum and median altitude and surface area), particularly in the case of the small tongues located at low elevations (Glacier 1, 5 and 16) which have been undergoing accelerated disintegration since the 1990s and will likely disappear in the coming years. Moreover, thanks to the availability of aerial data, a surging event was detected on the Antisana Glacier 8 (G8) in the 2009–2011 period; such an event is extremely rare in this region and deserves a dedicated study. Despite the effect of the complex topography, glaciers have reacted in agreement with changes in climate forcing, with a stepwise transition towards warmer and alternating wet–dry conditions since the mid-1970s. Long-term decadal variability is consistent with the warm–cold conditions observed in the Pacific Ocean represented by the Southern Oscillation index.

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Bourdon, Erwan, Jean-Philippe Eissen, Joseph Cotten, Michel Monzier, Claude Robin, and Minard L. Hall. "Les laves calco-alcalines et à caractère adakitique du volcan Antisana (Equateur): hypothèse pétrogénétique." Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 328, no. 7 (1999): 443–49. http://dx.doi.org/10.1016/s1251-8050(99)80144-x.

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15

Bourdon, E. "Slab Melt Metasomatism Beneath the North Andean Volcanic Zone? Insight from Antisana Volcano Rocks (Ecuador)." Mineralogical Magazine 62A, no. 1 (1998): 209–10. http://dx.doi.org/10.1180/minmag.1998.62a.1.111.

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Manciati, Carla, Marcos Villacís, Jean-Denis Taupin, Eric Cadier, Remigio Galárraga-Sánchez, and Bolívar Cáceres. "Empirical mass balance modelling of South American tropical glaciers: case study of Antisana volcano, Ecuador." Hydrological Sciences Journal 59, no. 8 (2014): 1519–35. http://dx.doi.org/10.1080/02626667.2014.888490.

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17

Quevedo-Amay, Deisy Valeria, Mayra Carolina Heras-Heras, Santiago Homero Cuichan-Paucar, and Álvaro Luis Reyes-Córdova. "Estudio multitemporal de la cobertura vegetal mediante sistemas de información geográfica. Caso: Reserva ecológica antisana." CIENCIAMATRIA 9, no. 1 (2023): 928–45. http://dx.doi.org/10.35381/cm.v9i1.1109.

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El objetivo del estudio fue realizar un análisis multitemporal de los cambios en la cobertura vegetal y uso del suelo en la Reserva Ecológica Antisana entre 1990 y 2020. El presente estudio se desarrolló en una investigación descriptiva comparativa. Los resultados arrojados que el análisis multitemporal de los cambios de las capas vegetales y uso de suelo de los períodos 1990-2000 demostró que las vegetaciones que resultaron afectadas con el paso del tiempo fueron el bosque nativo, páramo, pastizal y glaciar. Se puede concluir que una comparación de diferentes tipos de cobertura vegetal y uso de la tierra muestra una disminución preocupante de bosques nativos y glaciares, mientras que la vegetación de páramo está aumentando. Además, hubo un cambio significativo en la vegetación arbustiva y un aumento en el área sin cobertura vegetal, lo que indica un cambio importante en el paisaje con posibles impactos.

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18

Serrano, Sthefano. "Los cazadores recolectores “perdidos del formativo” en la interacción Andes y Amazonia del septentrión ecuatoriano (1400 - 400 a.C.)." Antropología Cuadernos de investigación, no. 18 (December 1, 2017): 55. http://dx.doi.org/10.26807/ant.v0i18.124.

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El presente artículo forma parte de una investigación llevada a cabo entre las regiones Andes y Amazonía, específicamente en la zona de influencia de los volcanes Antisana y Cayambe (Serrano, 2017). Bajo la propuesta de un modelo de intercambio, inferido a través de la etnoarqueología (intercambio recíproco entre unidades domésticas) y en base a los datos arqueológicos recuperados de la excavación del sitio Nona-Sadiguena (Oyacachi), se pone al descubierto las dinámicas de los grupos humanos dentro del período “Formativo”. La evidencia de su cultura material, da cuenta de la fuerte interacción entre grupos de aldeas estables y grupos móviles cazadores-recolectores-cultivadores, que aprovecharon los recursos provenientes de diversas ecologías: altos páramos, valles interandinos, bosques nubosos y selvas altas, asegurando así su coexistencia.

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19

Torres, Wendy, Alejandra Torres, Esteban Valencia, Paul Pinchao, Kenny Escobar-Segovia, and Edgar Cando. "Experimental Validation of the Remote Sensing Method for River Velocity Measurement Using an Open-Source PIV Scheme—Case Study: Antisana River in the Ecuadorian Andes." Water 16, no. 22 (2024): 3177. http://dx.doi.org/10.3390/w16223177.

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This study presents the experimental validation of a remote sensing method for river flow velocity measurement, from which discharge is calculated, using Particle Image Velocimetry (PIV) combined with Unmanned Aerial Vehicles (UAVs). The case study focuses on the Antisana River in the Ecuadorian Andes, a region with challenging geography where accurate flow measurement is crucial for hydroelectric projects. The validation results demonstrate that the velocity measurements obtained through PIV closely align with those from standardized traditional methods. Furthermore, integrating technologies such as LiDAR for cross-sectional measurements, along with UAVs, would enable the accurate estimation of discharge in difficult-to-access areas. This approach has the potential to significantly enhance hydrological studies and water resource management in remote regions, especially for hydroelectric projects in the Ecuadorian Andes.

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De Vries, Tjitte, José Cabot, Mónica Coello, and Diego Alarcón. "Breeding and feeding biology of the Gurney’s Hawk Geranoaetus poecilochrous in the paramo of Antisana, Ecuador." Revista Ecuatoriana de Medicina y Ciencias Biológicas 35, no. 1-2 (2017): 99–114. http://dx.doi.org/10.26807/remcb.v35i1-2.253.

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 La biología reproductiva y aspectos relacionados con el aporte de presas y alimentación durante la crianza de los pollos del Gavilán de Gurney, Geranoaetus poecilochrous, fueron estudiados durante 1991 - 1994 y 2007 - 2012 en el páramo del Antisana, Ecuador, a 3800 – 4 000 msnm. De 8 territorios bajo control, 6 (75%) lo constituyeron grupos poliandricos. La nidificación se inicia en casi todos los meses del año, pero el 74% aconteció en los primeros seis meses del año. El intervalo entre nidificaciones consecutivas de las mismas parejas o grupos poliandricos fue de 6 - 11 meses. La presa principal de la dieta de los pichones fueron conejos, Sylvilagus brasiliensis. La mayoría de las presas para los pichones la aportaron los machos. Los grupos poliandricos se mantuvieron estables durante los cuatro años de estudio, salvo en un territorio en el que se detectaron 3 hembras diferentes en 14 años. Los machos contribuyeron en la construcción del nido, incubación, vigilancia y en aportar presas al nido. En los grupos poliandricos un único macho copuló con la hembra, los otros machos del grupo actuaron como meros “ayudantes”. De 15 adultos, en cinco territorios, cuatro (26.7%, 3 machos, 1 hembra) fueron de la fase clara y 11 (73.3%, 4 hembras, 7 machos) de la fase oscura. Detalles de cuatro sonidos (llamadas) son presentados. Los machos ayudantes presentan plumaje subterminal con la parte dorsal rojizo quizás por su condición de subordinados al macho alpha.

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Cabrera-García, Santiago, Peter L. M. Goethals, Koen Lock, et al. "Taxonomic and Feeding Trait-Based Analysis of Macroinvertebrates in the Antisana River Basin (Ecuadorian Andean Region)." Biology 12, no. 11 (2023): 1386. http://dx.doi.org/10.3390/biology12111386.

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High-elevation tropical streams are under increasing threat from human activities and climate change. Specifically, Ecuadorian Andean streams require priority actions such as bioassessment (e.g., biodiversity and functional ecology of macroinvertebrates) in order to generate adequate environmental management policies. Therefore, we investigated the distribution and composition of the macroinvertebrate taxa and their functional feeding groups in relation to the environmental variables in the Antisana river basin (Andean–Ecuadorian Region). We sampled macroinvertebrates from 15 locations to assess ecological conditions (ECs), expressed as the Biological Monitoring Working Party Colombia (BMWP-Col) classes, the Andean Biotic Index (ABI) and the Andean–Amazon Biotic Index (AAMBI). Results indicate that dissolved oxygen saturation, elevation, nutrient concentration and conductivity contributed significantly to the composition of the taxa and functional feeding groups (FFGs). Taxa diversity and FFGs were more abundant in the best EC sites. Shredders (SH) were, overall, dominant and abundant at sites with medium-high ECs. Scrapers constituted the second most prevalent assemblage, exerting dominance at moderate ecological conditions (high altitude and high oxygen saturation). Collector–gathers (CGs) are less sensitive to contamination than the previous two groups but were equally abundant at medium-high EC sites. Collector–filterers (CFs) and parasites (PAs) were less abundant, although the presence of the former was slightly related to better environmental conditions. Predators (PRs) were almost absent throughout the study, but they were collected from poor EC sites. CGs, PAs and PRs showed more tolerance to the presence of human disturbances (e.g., hydraulic constructions or slope erosion). The BMWP-Col index seems to be the best fit for this ecosystem, showing a significant difference in FFG between the index classes, compared to the other indices evaluated. The results of this investigation may be regarded as a fundamental starting point and used in future bioassessment work in other similar ecosystems, particularly high-altitude tropical Ecuadorian streams.

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Carchipulla-Morales, Paul David, and Xavier Zapata-Ríos. "Probabilistic Analysis of the Spatio–Temporal Soil Saturation and Water Level Variability of the Pugllohuma Peatland Using Synthetic Aperture Radar Images of the Sentinel-1 Mission." Engineering Proceedings 6, no. 1 (2021): 64. http://dx.doi.org/10.3390/i3s2021dresden-10120.

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This study presents the spatio–temporal assessment of the Pugllohuma peatland’s soil saturation and water level variability. The Pugllohuma is a high elevation wetland located within the Sustainable Water Conservation Area Antisana in the northern Andes of Ecuador above 4100 m.a.s.l. This assessment provides information of the dry and wet seasons in the Pugllohuma peatland. The temporal variability was investigated considering variables such as: atmospheric pressure, rainfall, relative humidity, air temperature, wind speed and direction records of two near meteorological stations, while the spatial variability was investigated through images of the Sentinel-1 mission from 2017 to 2019, and terrain characteristics such as: elevation and slope. Image analysis and degree of soil saturation classification were carried out using the R programming language and Google Earth Engine, and the results were published in the UI service in Google Apps Script.

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Williams, Mark W., Eran W. Hood, Gustav Ostberg, Bernard Francou, and Remigio Galarraga. "Synoptic Survey of Surface Water Isotopes and Nutrient Concentrations, Paramo High-Elevation Region, Antisana Ecological Reserve, Ecuador." Arctic, Antarctic, and Alpine Research 33, no. 4 (2001): 397. http://dx.doi.org/10.2307/1552548.

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24

BOURDON, E. "Adakite-like Lavas from Antisana Volcano (Ecuador): Evidence for Slab Melt Metasomatism Beneath Andean Northern Volcanic Zone." Journal of Petrology 43, no. 2 (2002): 199–217. http://dx.doi.org/10.1093/petrology/43.2.199.

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25

Williams, Mark W., Eran W. Hood, Gustav Ostberg, Bernard Francou, and Remigio Galarraga. "Synoptic Survey of Surface Water Isotopes and Nutrient Concentrations, Páramo High-Elevation Region, Antisana Ecological Reserve, Ecuador." Arctic, Antarctic, and Alpine Research 33, no. 4 (2001): 397–403. http://dx.doi.org/10.1080/15230430.2001.12003447.

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26

Heredia, María Belén, Clémentine Junquas, Clémentine Prieur, and Thomas Condom. "New Statistical Methods for Precipitation Bias Correction Applied to WRF Model Simulations in the Antisana Region, Ecuador." Journal of Hydrometeorology 19, no. 12 (2018): 2021–40. http://dx.doi.org/10.1175/jhm-d-18-0032.1.

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Abstract The Ecuadorian Andes are characterized by a complex spatiotemporal variability of precipitation. Global circulation models do not have sufficient horizontal resolution to realistically simulate the complex Andean climate and in situ meteorological data are sparse; thus, a high-resolution gridded precipitation product is needed for hydrological purposes. The region of interest is situated in the center of Ecuador and covers three climatic influences: the Amazon basin, the Andes, and the Pacific coast. Therefore, regional climate models are essential tools to simulate the local climate with high spatiotemporal resolution; this study is based on simulations from the Weather Research and Forecasting (WRF) Model. The WRF Model is able to reproduce a realistic precipitation variability in terms of the diurnal cycle and seasonal cycle compared to observations and satellite products; however, it generated some nonnegligible bias in the region of interest. We propose two new methods for precipitation bias correction of the WRF precipitation simulations based on in situ observations. One method consists of modeling the precipitation bias with a Gaussian process metamodel. The other method is a spatial adaptation of the cumulative distribution function transform approach, called CDF-t, based on Voronoï diagrams. The methods are compared in terms of precipitation occurrence and intensity criteria using a cross-validation leave-one-out framework. In terms of both criteria, the Gaussian process metamodel approach yields better results. However, in the upper parts of the Andes (&gt;2000 m), the spatial CDF-t method seems to better preserve the spatial WRF physical patterns.

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Lauer, Wilhelm, and M. Daud Rafiqpoor. "Páramo de Papallacta - A physiogeographical map 1:50.000 of the area around the Antisana (Eastern Cordillera of Ecuador)." erdkunde 54, no. 1 (2000): 20–33. http://dx.doi.org/10.3112/erdkunde.2000.01.02.

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Hall, Minard L., Patricia A. Mothes, Pablo Samaniego, et al. "Antisana volcano: A representative andesitic volcano of the eastern cordillera of Ecuador: Petrography, chemistry, tephra and glacial stratigraphy." Journal of South American Earth Sciences 73 (January 2017): 50–64. http://dx.doi.org/10.1016/j.jsames.2016.11.005.

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Friedman, Marci, Jeffrey Nield, and Timothy Weed. "Community Involvement in the Protection of a Threatened Latin American Ecosystem: The Antisana Ecological Reserve REGIONAL REPORT Ecuador." Journal of Environment & Development 3, no. 1 (1994): 153–61. http://dx.doi.org/10.1177/107049659400300111.

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Gualco, Luis Felipe, Lenin Campozano, Luis Maisincho, et al. "Corrections of Precipitation Particle Size Distribution Measured by a Parsivel OTT2 Disdrometer under Windy Conditions in the Antisana Massif, Ecuador." Water 13, no. 18 (2021): 2576. http://dx.doi.org/10.3390/w13182576.

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Monitoring precipitation in mountainous areas using traditional tipping-bucket rain gauges (TPB) has become challenging in sites with strong variations of air temperature and wind speed (Ws). The drop size distributions (DSD), amount, and precipitation-type of a Parsivel OTT2 disdrometer installed at 4730 m above sea level (close to the 0 °C isotherm) in the glacier foreland of the Antisana volcano in Ecuador are used to analyze the precipitation type. To correct the DSDs, we removed spurious particles and shifted fall velocities such that the mean value matches with the fall velocity–diameter relationship of rain, snow, graupel, and hail. Solid (SP) and liquid precipitation (LP) were identified through −1 and 3 °C thresholds and then grouped into low, medium, and high Ws categories by k-means approach. Changes in DSDs were tracked using concentration spectra and particle’s contribution by diameter and fall velocity. Thus, variations of concentration/dispersion and removed hydrometeors were linked with Ws changes. Corrected precipitation, assuming constant density (1 g cm−3), gives reliable results for LP with respect to measurements at TPB and overestimates SP measured in disdrometer. Therefore, corrected precipitation varying density models achieved fewer differences. These results are the first insight toward the understating of precipitation microphysics in a high-altitude site of the tropical Andes.

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Cabrera, Marcela, Bryan G. Valencia, Oscar Lucas-Solis, et al. "A new method for microplastic sampling and isolation in mountain glaciers: A case study of one antisana glacier, Ecuadorian Andes." Case Studies in Chemical and Environmental Engineering 2 (September 2020): 100051. http://dx.doi.org/10.1016/j.cscee.2020.100051.

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BASANTES-SERRANO, RUBÉN, ANTOINE RABATEL, BERNARD FRANCOU та ін. "Slight mass loss revealed by reanalyzing glacier mass-balance observations on Glaciar Antisana 15α (inner tropics) during the 1995–2012 period". Journal of Glaciology 62, № 231 (2016): 124–36. http://dx.doi.org/10.1017/jog.2016.17.

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ABSTRACTIn this paper, we reanalyze the glacier mass balance on Glaciar Antisana 15α over the 1995–2012 period. Annual glacier mass balances were quantified on the basis of monthly glaciological measurements using an adaptation of Lliboutry's statistical approach. The geodetic mass balance was computed between 1997 and 2009 giving a cumulative balance of −1.39 ± 1.97 m w.e. and a slightly negative adjusted annual glaciological mass balance (−0.12 ± 0.16 m w.e. a−1). Despite a careful analysis of uncertainties, we found a large discrepancy between the cumulative glaciological and the geodetic mass balances over the common period, of 4.66 m w.e. This discrepancy can mainly be explained by underestimated net accumulation in the glacier upper reaches, which could be due to the peculiar climate conditions of the equatorial zone with year round accumulation, thereby preventing clear identification of annual layers. An increase of ~70% in measured rates of net accumulation would be needed to balance the glaciological and geodetic mass balances; a hypothesis confirmed by estimated ice flux in the vicinity of the ELA. Consequently, the vertical gradient of precipitation may be higher than previously estimated and the accumulation processes (including the role of frost deposition) need to be carefully analyzed.

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Tellkamp, Markus P., and Henry J. Herrera. "Conservation of paramo birds in Ecuador in the face of climate change: on the need for a detailed classification of high-altitude habitats." Bionatura Journal 1, no. 2 (2024): 1–7. http://dx.doi.org/10.70099/bj/2024.01.02.2.

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When we think of "the paramo," most of us think of waves of grass moving in the wind. However, our concept of paramo is limited by the lack of prehistoric data on what this ecosystem would have been like without human activity. Throughout the Holocene, humans have been part of the Andean landscape, shaping it through fire and by hunting important herbivores, such as deer and cottontails. Pollen records are scant due to glaciers having scraped high Andean lakes and peatlands off the landscape. What we find today at high altitudes is not "one paramo" but "several types of paramo" that are likely the result of various intensities of human activity. The different vegetation forms we see today are habitats for various birds within the ecosystem. The classification of vegetation for the Ecuadorian Andes by Sierra 1 recognizes several high Andean plant assemblages, yet these do not accurately describe the diversity of plant communities vis-à-vis avian habitats. For instance, the Antisana paramo is composed of a mixture of plant formations not recognized in previous classifications 2 that birds depend on for at least one life stage.

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Campozano, Lenin, Leandro Robaina, Luis Felipe Gualco, et al. "Parsimonious Models of Precipitation Phase Derived from Random Forest Knowledge: Intercomparing Logistic Models, Neural Networks, and Random Forest Models." Water 13, no. 21 (2021): 3022. http://dx.doi.org/10.3390/w13213022.

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The precipitation phase (PP) affects the hydrologic cycle which in turn affects the climate system. A lower ratio of snow to rain due to climate change affects timing and duration of the stream flow. Thus, more knowledge about the PP occurrence and drivers is necessary and especially important in cities dependent on water coming from glaciers, such as Quito, the capital of Ecuador (2.5 million inhabitants), depending in part on the Antisana glacier. The logistic models (LM) of PP rely only on air temperature and relative humidity to predict PP. However, the processes related to PP are far more complex. The aims of this study were threefold: (i) to compare the performance of random forest (RF) and artificial neural networks (ANN) to derive PP in relation to LM; (ii) to identify the main drivers of PP occurrence using RF; and (iii) to develop LM using meteorological drivers derived from RF. The results show that RF and ANN outperformed LM in predicting PP in 8 out of 10 metrics. RF indicated that temperature, dew point temperature, and specific humidity are more important than wind or radiation for PP occurrence. With these predictors, parsimonious and efficient models were developed showing that data mining may help in understanding complex processes and complements expert knowledge.

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Torres Romero, Sergio Fernando, and Carlos Oswaldo Proaño Santos. "Componentes del balance hídrico en los páramos de Jatunsacha, Ecuador." La Granja 28, no. 2 (2018): 52–66. http://dx.doi.org/10.17163/lgr.n28.2018.04.

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El páramo es una zona biogeográfica de alta montaña que comúnmente se extiende entre el límite superior del bosque andino hasta por debajo de las nieves perpetuas. Hidrológicamente este ecosistema presenta una buena regulación de los caudales bases, como resultado de la interacción de los componentes precipitación, humedad del suelo y evapotranspiración, lo que permite el abastecimiento continuo del recurso hídrico para las poblaciones ubicadas en las cuencas medias y bajas de la región Andina. La presente investigación tiene como objetivo evaluar el comportamiento de los principales parámetros que caracterizan el balance hídrico en los páramos de Jatunsacha, con base en la recolección, análisis y procesamiento de la información hidroclimatologica de estaciones ubicadas en los páramos de Antisana, como mecanismo de apoyo en la toma de decisiones para el manejo y conservación de zonas de recarga hídrica de la parte norte del Ecuador. De acuerdo con los resultados, la dinámica del régimen hidrológico en la zona de estudio está determina por eventos de lluvia de baja intensidad, volumen y duración pero muy frecuentes, por un contenido de humedad del suelo entre capacidad de campo y punto de saturación, por una evapotranspiración relativamente baja, por un caudal muy variable que genera un coeficiente de escorrentía bajo y por una percolación alta típico en zonas con geología porosa.

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Villarreal-Yazán, Bolívar, Verónica Maila-Álvarez, Helen Figueroa-Cepeda, and Elizabeth Pérez-Alarcón. "Retos y logros de la aplicación de grupos interactivos en una comunidad de aprendizaje." Cátedra 4, no. 1 (2021): 56–80. http://dx.doi.org/10.29166/catedra.v4i1.2676.

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La presente investigación nace de la necesidad de evaluar los logros y retos respecto a la implementación de una nueva estrategia metodológica educativa propuesta en el Ecuador. Los objetivos que se plantearon fueron: 1) Evaluar la aplicación de los Grupos Interactivos como estrategia metodológica de aprendizaje. 2) Determinar las dificultades que afronta la institución en la fase de implementación. 3) Establecer los logros alcanzados. Este trabajo de tipo descriptivo y cualitativo considera como caso de estudio a la Unidad Educativa Antisana, institución ubicada en un contexto rural del Ecuador. Los instrumentos de investigación aplicados fueron la entrevista semiestructurada dirigida al rector y grupos focales a docentes, estudiantes y voluntarios. Los ámbitos de indagación convergieron en la gestión administrativa institucional, cualidades del docente, aplicación de la metodología de grupos interactivos y desempeño de los voluntarios. Los principales logros alcanzados fueron diálogo igualitario, transformación y solidaridad, como principios del aprendizaje dialógico, además del liderazgo estudiantil y la potenciación de la zona de desarrollo próximo. Se advirtieron dificultades en algunos estudiantes, docentes y voluntarios evidenciadas en la falta de empoderamiento, superficialidad de las actividades instrumentales y escasa participación, respectivamente. Los retos generados de esta primera experiencia giran en torno a la consolidación de la estrategia a través de la interiorización del enfoque de los grupos interactivos. Es necesario proponer actividades colaborativas e integrar a otros actores sociales en calidad de voluntarios. Aspectos que permitirán fortalecer la inclusión y la cohesión social.

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37

Wetzel, Carlos, de Vijver Bart Van, Katerina Kopalova, Lucien Hoffmann, Laurent Pfister, and Luc Ector. "Type analysis of the South American diatom Achnanthes haynaldii (Bacillariophyta) and description of Planothidium amphibium sp. nov., from aerial and aquatic environments in Oregon (USA)." Plant Ecology and Evolution 147, no. (3) (2014): 439–54. https://doi.org/10.5091/plecevo.2014.1058.

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<b>Background and aims</b> – <i>Planothidium haynaldii</i> (Schaarschm.) Lange-Bert. (≡ <i>Achnanthes haynaldii</i> Schaarschm.) is a widely reported species from temperate and cold zones of southern and northern hemispheres despite being originally described from a high altitude stratovolcano (Antisana, 4100 m a.s.l.) in Ecuador (tropical climatic zone). Although widely cited in the literature, studies concerning the original material were never carried out. The main objective of this paper is to clarify the identity of <i>Planothidium haynaldii</i> and two related species from North-western USA and Antarctic environments. <b>Methods</b> – The original type slide of <i>Achnanthes haynaldii</i> Schaarschm. was observed. Additionally, selected samples containing populations currently identified either as <i>Planothidium haynaldii</i> or <i>Achnanthes lanceolata</i> var. <i>capitata</i> O.Müll. collected in Oregon (USA) and James Ross Island (Antarctica) were observed. The samples were analyzed using light (LM) and scanning electron microscopy (SEM). <b>Key results</b> – A new species, commonly improperly identified as <i>Planothidium haynaldii</i>, is described as <i>Planothidium amphibium</i> C.E.Wetzel, Ector & L.Pfister sp. nov. from aerial and aquatic habitats of Oregon (USA). This species is widely distributed in the northern hemisphere according to illustrated literature records. <i>Achnanthes lanceolata</i> var. <i>capitata</i> is erected to species level and transferred to the genus <i>Planothidium</i> . <i>Planothidium capitatum</i> (O.Müll.) Van de Vijver, Kopalová, C.E.Wetzel & Ector comb. & stat. nov. seems to be an important component of the communities in the Antarctic region where large populations were found on James Ross Island and Livingston Island living in the epilithon and epipelon of large lakes. Finally, <i>Planothidium haynaldii</i> seems to be rarer than initially expected and its occurrence is confirmed only in the Andes mountain range in South America (recent freshwater sample from Ecuador and as fossil in Chile).

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Susol, N. U. "INHIBITION OF THE EXPRESSION OF PHYSIOLOGICAL PRIONS WITH ANTISENS-OLIGONUCLEOTIDES." Biotechnologia Acta 10, no. 5 (2017): 43–50. http://dx.doi.org/10.15407/biotech10.05.043.

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39

MCDUFFIE, FREDERIC C. "Reference Antisera." Rheumatology 25, no. 1 (1986): 130. http://dx.doi.org/10.1093/rheumatology/25.1.130-a.

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40

Kokošková, B., I. Pánková, and V. Krejzar. "Characteristics of polyclonal antisera for detection and determination of Clavibacter michiganensis subsp. insidiosus." Plant Protection Science 36, No. 2 (2000): 46–52. http://dx.doi.org/10.17221/9621-pps.

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41

Kahn, A. "La double complémentarité : ARN sens et antisens, peptides sens et antisens." médecine/sciences 3, no. 5 (1987): 299. http://dx.doi.org/10.4267/10608/3684.

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42

Manus, Jean-Marie. "Hypercholestérolémie familiale : l’arme antisens." Revue Francophone des Laboratoires 2010, no. 423 (2010): 20–21. http://dx.doi.org/10.1016/s1773-035x(10)70533-5.

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43

Treacy, M., P. Bonness, J. Case, et al. "Manufacturers' comments on antisera." Transfusion 25, no. 3 (1985): 290–91. http://dx.doi.org/10.1046/j.1537-2995.1985.25385219922.x.

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44

Cooper, Helen M., and Yvonne Paterson. "Production of Polyclonal Antisera." Current Protocols in Neuroscience 00, no. 1 (1997): 5.5.1–5.5.9. http://dx.doi.org/10.1002/0471142301.ns0505s00.

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45

Coligan, John E., James P. Tam, and Jun Shao. "Production of Antipeptide Antisera." Current Protocols in Neuroscience 00, no. 1 (1997): 5.6.1–5.6.21. http://dx.doi.org/10.1002/0471142301.ns0506s00.

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Ma, Chao, Yan Chen, Wen dong Ren, Xing yu Liu, Wen Gu, and Hui li Zhou. "Performance Evaluation of Composite Antisalt Agents and the Antisalt Dynamics Simulation Mechanism." ACS Omega 7, no. 15 (2022): 13075–82. http://dx.doi.org/10.1021/acsomega.2c00452.

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Cowles, J. W., M. T. Cox, A. McMican, and N. Blumberg. "Comparison of Monoclonal Antisera with Conventional Antisera for Lewis Blood Group Antigen Determination." Vox Sanguinis 52, no. 1-2 (1987): 83–84. http://dx.doi.org/10.1159/000461616.

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Cowles, J. W., M. T. Cox, A. McMican, and N. Blumberg. "Comparison of Monoclonal Antisera with Conventional Antisera for Lewis Blood Group Antigen Determination." Vox Sanguinis 52, no. 1-2 (1987): 83–84. http://dx.doi.org/10.1111/j.1423-0410.1987.tb02996.x.

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49

Alonso, Albino, Mauricio A. Martins, D. Gomes Maria da Penha, Rossana Allende, and Magnus S. Söndahl. "Foot-and-Mouth Disease Virus Typing by Complement Fixation and Enzyme-Linked Immunosorbent Assay using Monovalent and Polyvalent Antisera." Journal of Veterinary Diagnostic Investigation 4, no. 3 (1992): 249–53. http://dx.doi.org/10.1177/104063879200400304.

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An indirect “sandwich” enzyme-linked immunosorbent assay (ELISA) using polyvalent and monovalent antisera was compared with the 50% complement fixation (CF) test for the detection of foot-and-mouth disease (FMD) O, A, and C virus types. ELISA was more sensitive than CF tests when polyvalent antisera were used for detecting the 3 types of virus in epithelial samples, whereas ELISA using monovalent antisera was the least sensitive technique. The ELISA performed with polyvalent antisera was 9 times more sensitive for detecting FMD virus than that with monovalent antisera. However, viral isolation in cell culture was the most sensitive detection system. The combined use of ELISA with polyvalent antisera and cell culture inoculations was the most effective procedure for identifying FMD virus in epithelial samples from the field.

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Lomsky, R., J. Pribysova, V. Jirkalova, and F. Saudek. "Deltins: immunochemical evidence for a novel population of peptides of the D cells of the gastro-entero-pancreatic endocrine system." Journal of Endocrinology 168, no. 3 (2001): 391–400. http://dx.doi.org/10.1677/joe.0.1680391.

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Differences between the immunocytochemical behaviour of antisera to partially purified porcine gastrins and antisera to either synthetic human gastrin-17-I or highly purified porcine gastrin-17-I raised the hypothesis that hog antral gastrin extracts contain peptides different from somatostatin and gastrin that are responsible for the immunocytochemical reaction of the former antisera in the D (delta) cells of the gastro-entero-pancreatic (GEP) endocrine system. This study was performed to prove this hypothesis. A discard fraction obtained after gel filtration of hog antral gastrin extracts on Sephadex G-50 Superfine was employed to immunize five rabbits. The discard fraction is highly heterogeneous on two-dimensional electrophoresis and contains merely traces of somatostatin and gastrin in RIA. However, rabbit antisera to the discard fraction give strongly positive immunocytochemical reactions exclusively in the D cells of the human antroduodenal mucosa and of the pancreatic islets. Absorption of the antisera with the lyophilized discard fraction abolishes the staining of the D cells, whereas absorption of the antisera with several somatostatins does not affect the staining. Vice versa, staining of the D cells with antisera to cyclic somatostatin-14 is abolished by absorption of the antisera with somatostatin-14 but not by absorption with excess of the discard fraction. In RIA, antisera to the discard fraction do not bind radiolabelled (Tyr(1))-somatostatin-14, Tyr-somatostatin-28 or synthetic human gastrin-17-I. Two-dimensional electrophoresis of acid extracts of isolated canine pancreatic islets followed by Western blotting shows different patterns of distribution of immunoreactive spots obtained with antisera to the discard fraction, to somatostatin-14, and to human proinsulin respectively. These results indicate the existence of a novel population of peptides of the D cells of the GEP endocrine system, for which we propose the term deltins.

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