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Journal articles on the topic 'Amazonian slope'

Author: Grafiati

Published: 14 September 2024

Last updated: 31 July 2025

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1

Nores, Manuel. "The Western Amazonian Boundary for Avifauna Determined by Species Distribution Patterns and Geographical and Ecological Features." International Journal of Ecology 2011 (2011): 1–7. http://dx.doi.org/10.1155/2011/958684.

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In northern South America, an extensive tropical lowland runs 5,000 km from the Atlantic coast to the foot of the Andes. The slope is gentle until about 500 m where the eastern Andes rise abruptly. The lowland supports Amazonia, which is the most extensive tract of tropical rainforest on the planet. Most of its boundaries are well defined, but the boundary between Amazonia and the forest of the eastern slopes of the Andes has not been clearly defined. To determine for avifauna whether Amazonia is restricted to the lowland of northern South America or whether it also extends up into the eastern

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2

IRMLER, ULRICH. "New species and records of the genus Lispinus with a key to the species from Peru (Coleoptera: Staphylinidae: Osoriinae)." Zootaxa 2263, no. 1 (2009): 42–58. http://dx.doi.org/10.11646/zootaxa.2263.1.4.

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Four new species of Lispinus from the premontane forest of the eastern slope of the Peruvian Andes are described and records of all other Lispinus species from Peru are given. The new species are: L. blandus, L. minimus, L. speciosus, and L. peruanus. A key to the known 21 Peruvian species is provided, habitat information is summarized and geographical distribution of species is discussed. The following six types of zoogeographic distribution can be differentiated for the Peruvian Lispinus species: endemic, eastern Andean, lowland Amazonian, Circum-Amazonian, northern Southand Central-American

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3

Morales-Martínez, Darwin M., Héctor E. Ramírez-Chaves, Javier E. Colmenares-Pinzón, and Luis G. Gómez. "The Koepcke’s spear-nosed bat, Gardnerycteris koepckeae (Gardner and Patton, 1972) (Chiroptera: Phyllostomidae), is not endemic to Peru: first record from the Amazon foothills of Colombia." Mammalia 84, no. 5 (2020): 439–47. http://dx.doi.org/10.1515/mammalia-2019-0107.

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AbstractWe report the first record of the rare Koepcke’s spear-nosed bat Gardnerycteris koepckeae collected outside of Peru, based on morphological and cytochrome b data. The species was found at the National Natural Park Alto Fragua Indi-Wasi, Department of Caquetá, Colombia. This record extended the species distribution 1400 km north from the northernmost known locality in Huanhuachayo, Ayacucho, Peru. This finding suggests that G. koepckeae is distributed over middle elevations along the eastern slope of the Andean-Amazonia foothills in Peru and Colombia, similar to other Phyllostomid bats,

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4

Kennedy, Helen. "New Ecuadorian species in Calathea series Nudiscapae (Marantaceae)." Canadian Journal of Botany 63, no. 6 (1985): 1141–49. http://dx.doi.org/10.1139/b85-157.

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Four Ecuadorian species in Calathea series Nudiscapae (Petersen) Schumann s.l. are described as new. Calathea tinalandia occurs on the Pacific slope of the Cordillera in Pichincha and Esmeraldas provinces, while C. lanicaulis, C. anderssonii, and C. clivorum occur in northeastern Ecuador in the Amazonian lowlands of Napo and Pastaza provinces.

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5

Lucas, Y., C. R. Montes, S. Mounier, et al. "Biogeochemistry of an amazonian podzol-ferralsol soil system with white kaolin." Biogeosciences Discussions 9, no. 2 (2012): 2233–76. http://dx.doi.org/10.5194/bgd-9-2233-2012.

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Abstract. Podzol-ferralsol soil systems cover great areas in Amazonia and in other equatorial regions, they are an end-member of old equatorial landscape evolution, are frequently associated with kaolin deposits and store and export large amounts of carbon. Their biogeochemistry was usually inferred from soil mineralogy and from spring or river water properties. This paper presents a database for groundwaters sampled in situ in a typical podzol-ferralsol soil catena from the Alto Rio Negro region, Brazil; the sampling periods allowed to sample under high- and low-level water-table conditions.

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6

Morales-Martínez, Darwin M., Héctor E. Ramírez-Chaves, Javier E. Colmenares-Pinzón, and Luis G. Gómez. "The Koepcke's spear-nosed bat, Gardnerycteris koepckeae (Gardner and Patton, 1972) (Chiroptera: Phyllostomidae), is not endemic to Peru: first record from the Amazon foothills of Colombia." Mammalia 84, no. 5 (2020): 439–47. https://doi.org/10.5281/zenodo.13415659.

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(Uploaded by Plazi for the Bat Literature Project) We report the first record of the rare Koepcke's spear-nosed bat Gardnerycteris koepckeae collected outside of Peru, based on morphological and cytochrome b data. The species was found at the National Natural Park Alto Fragua Indi-Wasi, Department of Caquetá, Colombia. This record extended the species distribution 1400 km north from the northernmost known locality in Huanhuachayo, Ayacucho, Peru. This finding suggests that G. koepckeae is distributed over middle elevations along the eastern slope of the Andean-Amazonia foothills in Peru and Co

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7

Morales-Martínez, Darwin M., Héctor E. Ramírez-Chaves, Javier E. Colmenares-Pinzón, and Luis G. Gómez. "The Koepcke's spear-nosed bat, Gardnerycteris koepckeae (Gardner and Patton, 1972) (Chiroptera: Phyllostomidae), is not endemic to Peru: first record from the Amazon foothills of Colombia." Mammalia 84, no. 5 (2020): 439–47. https://doi.org/10.5281/zenodo.13415659.

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(Uploaded by Plazi for the Bat Literature Project) We report the first record of the rare Koepcke's spear-nosed bat Gardnerycteris koepckeae collected outside of Peru, based on morphological and cytochrome b data. The species was found at the National Natural Park Alto Fragua Indi-Wasi, Department of Caquetá, Colombia. This record extended the species distribution 1400 km north from the northernmost known locality in Huanhuachayo, Ayacucho, Peru. This finding suggests that G. koepckeae is distributed over middle elevations along the eastern slope of the Andean-Amazonia foothills in Peru and Co

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8

Morales-Martínez, Darwin M., Héctor E. Ramírez-Chaves, Javier E. Colmenares-Pinzón, and Luis G. Gómez. "The Koepcke's spear-nosed bat, Gardnerycteris koepckeae (Gardner and Patton, 1972) (Chiroptera: Phyllostomidae), is not endemic to Peru: first record from the Amazon foothills of Colombia." Mammalia 84, no. 5 (2020): 439–47. https://doi.org/10.5281/zenodo.13415659.

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(Uploaded by Plazi for the Bat Literature Project) We report the first record of the rare Koepcke's spear-nosed bat Gardnerycteris koepckeae collected outside of Peru, based on morphological and cytochrome b data. The species was found at the National Natural Park Alto Fragua Indi-Wasi, Department of Caquetá, Colombia. This record extended the species distribution 1400 km north from the northernmost known locality in Huanhuachayo, Ayacucho, Peru. This finding suggests that G. koepckeae is distributed over middle elevations along the eastern slope of the Andean-Amazonia foothills in Peru and Co

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9

Morales-Martínez, Darwin M., Héctor E. Ramírez-Chaves, Javier E. Colmenares-Pinzón, and Luis G. Gómez. "The Koepcke's spear-nosed bat, Gardnerycteris koepckeae (Gardner and Patton, 1972) (Chiroptera: Phyllostomidae), is not endemic to Peru: first record from the Amazon foothills of Colombia." Mammalia 84, no. 5 (2020): 439–47. https://doi.org/10.5281/zenodo.13415659.

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Abstract:

(Uploaded by Plazi for the Bat Literature Project) We report the first record of the rare Koepcke's spear-nosed bat Gardnerycteris koepckeae collected outside of Peru, based on morphological and cytochrome b data. The species was found at the National Natural Park Alto Fragua Indi-Wasi, Department of Caquetá, Colombia. This record extended the species distribution 1400 km north from the northernmost known locality in Huanhuachayo, Ayacucho, Peru. This finding suggests that G. koepckeae is distributed over middle elevations along the eastern slope of the Andean-Amazonia foothills in Peru and Co

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10

Morales-Martínez, Darwin M., Héctor E. Ramírez-Chaves, Javier E. Colmenares-Pinzón, and Luis G. Gómez. "The Koepcke's spear-nosed bat, Gardnerycteris koepckeae (Gardner and Patton, 1972) (Chiroptera: Phyllostomidae), is not endemic to Peru: first record from the Amazon foothills of Colombia." Mammalia 84, no. 5 (2020): 439–47. https://doi.org/10.5281/zenodo.13415659.

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Abstract:

(Uploaded by Plazi for the Bat Literature Project) We report the first record of the rare Koepcke's spear-nosed bat Gardnerycteris koepckeae collected outside of Peru, based on morphological and cytochrome b data. The species was found at the National Natural Park Alto Fragua Indi-Wasi, Department of Caquetá, Colombia. This record extended the species distribution 1400 km north from the northernmost known locality in Huanhuachayo, Ayacucho, Peru. This finding suggests that G. koepckeae is distributed over middle elevations along the eastern slope of the Andean-Amazonia foothills in Peru and Co

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11

Morales-Martínez, Darwin M., Héctor E. Ramírez-Chaves, Javier E. Colmenares-Pinzón, and Luis G. Gómez. "The Koepcke's spear-nosed bat, Gardnerycteris koepckeae (Gardner and Patton, 1972) (Chiroptera: Phyllostomidae), is not endemic to Peru: first record from the Amazon foothills of Colombia." Mammalia 84, no. 5 (2020): 439–47. https://doi.org/10.5281/zenodo.13415659.

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Abstract:

(Uploaded by Plazi for the Bat Literature Project) We report the first record of the rare Koepcke's spear-nosed bat Gardnerycteris koepckeae collected outside of Peru, based on morphological and cytochrome b data. The species was found at the National Natural Park Alto Fragua Indi-Wasi, Department of Caquetá, Colombia. This record extended the species distribution 1400 km north from the northernmost known locality in Huanhuachayo, Ayacucho, Peru. This finding suggests that G. koepckeae is distributed over middle elevations along the eastern slope of the Andean-Amazonia foothills in Peru and Co

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12

Paca, Victor Hugo da Motta, Everaldo Barreiros de Souza, Joaquim Carlos Barbosa Queiroz, and Gonzalo E. Espinoza-Dávalos. "Assessment of Precipitation and Evapotranspiration in an Urban Area Using Remote Sensing Products (CHIRP, CMORPH, and SSEBop): The Case of the Metropolitan Region of Belem, Amazon." Water 15, no. 19 (2023): 3498. http://dx.doi.org/10.3390/w15193498.

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The aim of this study was to assess precipitation (P) and actual evapotranspiration (ET) by analyzing data from in situ stations compared with remote sensing products. Climate Hazards Center InfraRed Precipitation (CHIRP) and Climate Prediction Center morphing technique (CMORPH) were used for P and Operational Simplified Surface Energy Balance (SSEBop) was used for ET. The P in situ data for six stations were also compared to a reference station in the city. ET was analyzed for a single in situ station. The region chosen for this study was the Metropolitan Area of Belem (MAB), close to the est

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13

MARTINS, DÉBORAH ELENA GALVÃO, FLAVIO DE ALMEIDA ALVES-JÚNIOR, ISRAEL HIDENBURGO ANICETO CINTRA, and BIANCA BENTES. "Range extension of the mantis shrimp Bathysquilla microps (Manning, 1961) (Stomatopoda: Bathysquillidae) from the Brazilian deep waters." Zootaxa 5621, no. 2 (2025): 285–90. https://doi.org/10.11646/zootaxa.5621.2.8.

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This study reports a new record of the mantis shrimp Bathysquilla microps (Manning, 1961) from Brazilian deep waters. Five specimens of B. microps (3 males and 2 females) were collected during the ReviZEE surveys, with samples performed in some sites along the Amazonian continental slope, covering the depths between 250 and 1100 m, in June 2001. This new record of B. microps expands its geographic distribution, increasing morphological information about this species.

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14

Da Silva, Thiago Fernandes, Arthur dos Santos Souza, Maria Orlanilda Sousa De Araujo, and Daniel Batista da Silva França. "Urban Erosion in The Amazon Region: Mitigation and Control Strategies in The Municipality of Buriticupu (MA)." Revista de Gestão Social e Ambiental 18, no. 2 (2024): e05184. http://dx.doi.org/10.24857/rgsa.v18n2-089.

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Purpose: this work aims to analyze the factors that contributed to the intensification of erosion in the Amazon region of Buriticupu (MA) and discuss possible forms of mitigation and control.  Methods: urban area of the municipality was characterized and data on soil, pedology, relief, slope, use and occupation, economic activities developed, as well as satellite images, were collected. This information was used to analyze indicators of natural erosion processes, as well as the influence of human activities. Possible mitigation and control solutions were discussed.  Res

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15

Robinson, S. K., J. W. Fitzpatrick, and J. Terborgh. "Distribution and habitat use of Neotropical migrant landbirds in the Amazon basin and Andes." Bird Conservation International 5, no. 2-3 (1995): 305–23. http://dx.doi.org/10.1017/s0959270900001064.

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SummaryWe documented the geographical distributions and habitat selection of Neotropical migrants in South America along a successional gradient in the lowlands of Amazonian Peru, and along elevational gradients in the Andes of south-eastern Peru and of eastern and western Ecuador. Most of the 30 species of northern migrants that regularly winter in South America appear to be concentrated in the western edge of the Amazon basin and on the lower slopes (2,000 m) of the Andes. Migrants in a lowland site were documented more often in early successional habitats than in primary forest, and no spec

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16

Siliprandi, N. C., E. M. Nogueira, J. J. Toledo, P. M. Fearnside, and H. E. M. Nascimento. "Inter-site variation in allometry and wood density of Goupia glabra Aubl. in Amazonia." Brazilian Journal of Biology 76, no. 1 (2016): 268–76. http://dx.doi.org/10.1590/1519-6984.22514.

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Abstract The present study aims to compare the allometry and wood density of Goupia glabra Aubl. (Goupiaceae) in two different terra-firme sites in Amazonian forest. A total of 65 trees ≥ 10 cm DBH was sampled in both sites, with 39 trees in Nova Olinda do Norte (NOlinda, near the Amazon River) and 29 trees in Apuí (near the southern edge of the Amazon forest). Except for the relationship between DBH (diameter at breast height) and Ht (total height), allometric relationships for G.glabra differed significantly between sites. Apuí had lower intercept and greater slope for log10 (DBH) versus log

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17

Paez, Diego, Juan Guayasamin, and Mario Yanez. "A new species of Andean toad (Bufonidae, Osornophryne) discovered using molecular and morphological data, with a taxonomic key for the genus." ZooKeys 108 (June 17, 2011): 73–97. https://doi.org/10.3897/zookeys.108.1129.

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Combining a molecular phylogeny and morphological data, we discovered a new species of <i>Osornophryne</i> from the Amazonian slope of the Ecuadorian Andes. Morphologically, the new taxon is distinguished from all others species in <i>Osornophryne</i> bythe Toes IV and V longer than Toes I–III, a short and rounded snout with a small rostral papilla, and conical pustules on flanks. The new species previously was confused with <i>O. guacamayo</i>. A taxonomic key is provided for all known species of <i>Osornophryne</i>.

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Brito Filho, Elilson Gomes de, Milton César Costa Campos, Laércio Santos Silva, et al. "Variation of soil attributes along a sandstone-gneiss toposequence in southern Amazonas, Brazil." Revista Brasileira de Geomorfologia 23, no. 2 (2022): 1481–500. http://dx.doi.org/10.20502/rbg.v23i2.2086.

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Soil-landscape relationships in natural environments can provide helpful insights into soil suitability and limitations and necessary changes regarding agricultural land use and management. The objective of this work was to verify soil variations along a sandstone-gneiss lithological toposequence in the western Amazonian region of Brazil. Within this topolithosequence, the following soil profiles were sampled: CAMBISSOLO HÁPLICO (Dystric Leptic Cambisol), NEOSSOLO REGOLÍTICO (Cambic, Lithic, Leptosol), NEOSSOLO QUARTZARÊNICO (Dystric Regosol), PLINTOSSOLO PÉTRICO (Petric, Plinthosol), and ARGI

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Wild, Erik Russell. "Two New Species of Centrolenid Frogs from the Amazonian Slope of the Cordillera Oriental, Ecuador." Journal of Herpetology 28, no. 3 (1994): 299. http://dx.doi.org/10.2307/1564528.

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Tokarz, Elizabeth L., Pablo Álvia, Renato Valencia, and Simon A. Queenborough. "Habitat filtering of six coexisting Heliconia species in a lowland tropical rain forest in Amazonian Ecuador." Journal of Tropical Ecology 35, no. 2 (2019): 91–94. http://dx.doi.org/10.1017/s0266467419000026.

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AbstractHerbaceous plants are often under-studied in tropical forests, despite their high density and diversity, and little is known about the factors that influence their distribution at microscales. In a 25-ha plot in lowland Amazonian rain forest in Yasuní National Park, Ecuador, we censused six species of Heliconia (Heliconiaceae) in a stratified random manner across three topographic habitat types. We observed distribution patterns consistent with habitat filtering. Overall, more individuals occurred in the valley (N = 979) and slope (N = 847) compared with the ridge (N = 571) habitat. At

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Aymard C., Gerardo A. "A new species of Ophiocaryon (Sabiaceae) from the Amazonian slope of the eastern Cordillera of Colombia." Journal of the Botanical Research Institute of Texas 13, no. 1 (2019): 147–53. http://dx.doi.org/10.17348/jbrit.v13.i1.835.

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Ophiocaryon nicolasii, from the “Camino de los Andaquíes,” in the Amazonian slope of the Eastern Cordillera of Colombia, Caquetá department, is described and illustrated and its morphological relationships with other similar Ophiocaryon species are discussed. This new species is a small tree from the foothills to montane forest (500–1000 m). Morphologically it is related to O. manausense (W.A. Rodrigues) Barneby, but it differs by: smaller leaves, petioles, petiolules, and inflorescences; leaflets with 8–16 secondary veins; leaflets, bracteoles, staminodes and ovary with different shape; margi

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Silva, K. C. A., I. H. A. Cintra, M. Ramos-Porto, G. F. S. Viana, F. A. Abrunhosa, and R. Cruz. "Update on crustaceans known from the Amazonian continental shelf and adjacent oceanic areas." Crustaceana 93, no. 7 (2020): 687–701. http://dx.doi.org/10.1163/15685403-bja10062.

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Abstract The major biodiversity on the planet is present in coastal and oceanic environments, despite this, on the northern continental shelf of Brazil, data on most of the marine groups still are deficient, especially in areas deeper than 20 m and in the continental slope area. This lack of data is aggravated by high fisheries exploitation, which causes a decline in large, abundant populations, even leading them to threat of extinction. Among that marine biodiversity, no group has a larger morphological variety than crustaceans. In this scenario, knowledge about the local biodiversity, its ri

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Lucas, Y., C. R. Montes, S. Mounier, et al. "Biogeochemistry of an Amazonian podzol-ferralsol soil system with white kaolin." Biogeosciences 9, no. 9 (2012): 3705–20. http://dx.doi.org/10.5194/bg-9-3705-2012.

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Abstract. The podzol-ferralsol soil systems, which cover great areas of Amazonia and other equatorial regions, are frequently associated with kaolin deposits and store and export large amounts of carbon. Although natural organic matter (NOM) plays a key role in their dynamics, little is known about their biogeochemistry. In order to assess the specific role of dissolved organic matter (DOM) on NOM storage in deep horizons and to determine possible relationships between kaolin formation and DOM properties, we studied the groundwater composition of a typical podzol-ferralsol soil catena from the

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MARIMON, B. S., J. M. FELFILI, and E. S. LIMA. "FLORISTICS AND PHYTOSOCIOLOGY OF THE GALLERY FOREST OF THE BACABA STREAM, NOVA XAVANTINA, MATO GROSSO, BRAZIL." Edinburgh Journal of Botany 59, no. 2 (2002): 303–18. http://dx.doi.org/10.1017/s0960428602000124.

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The study was carried out on the gallery forest of the Bacaba stream situated in the Municipal Ecological Reserve ‘Mário Viana’ (14°43′S, 52°21′W) in Nova Xavantina, Eastern Mato Grosso, Brazil. Three sections of the gallery (upper, middle and lower) running downstream and differing in slope were surveyed by stratified sampling. Fortyseven nested 10m × 10m plots were analysed in each section, giving a total sampling area of 1.41ha overall. All trees or lianas ≥ 15cm girth at breast height were recorded and a total of 129 species belonging to 105 genera and 47 families were found. Diversity was

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Quizhpe, Wilson, Ángel Benítez, Klever Cuenca, et al. "Forest Diversity and Structure in the Amazonian Mountain Ranges of Southeastern Ecuador." Diversity 11, no. 10 (2019): 196. http://dx.doi.org/10.3390/d11100196.

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We analyze the structure of diameter, richness, and diversity of the forests in the upper limit of the great Amazon basin located in the Ecuadorian territory of the Cordilleras del Cóndor and Cutucú. Our hypothesis was that the forests of the eastern mountain ranges are not homogeneous, but rather present differences in their structure, richness, and floristic diversity. Our main objective was to classify the types of forests based on the characteristics of the diameter structure and the species composition of the Amazonian forests of the eastern mountain ranges in southern Ecuador, and we det

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MOULATLET, Gabriel M., Camilo D. RENNÓ, Fernando O. G. FIGUEIREDO, et al. "The role of topographic-derived hydrological variables in explaining plant species distributions in Amazonia." Acta Amazonica 52, no. 3 (2022): 218–28. http://dx.doi.org/10.1590/1809-4392202103682.

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ABSTRACT In Amazonian terra-firme non inundated forests, local floristic composition and species occurrence are explained by water availability as determined by topographic conditions. Topographic complexity can render these conditions quite variable across the landscape and the effects on plant ecological responses are difficult to document. We used a set of topographically defined hydrological metrics to evaluate community composition and single-species responses of four plant groups [pteridophytes (ferns and lycophytes), Melastomataceae, palms (Arecaceae) and Zingiberales] to topographic co

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Colinvaux, Paul A., Mark B. Bush, Miriam Steinitz-Kannan, and Michael C. Miller. "Glacial and Postglacial Pollen Records from the Ecuadorian Andes and Amazon." Quaternary Research 48, no. 1 (1997): 69–78. http://dx.doi.org/10.1006/qres.1997.1908.

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A long pollen record is derived from sediments of a lake dammed behind a low moraine of the last glaciation at 3°S latitude in the Ecuadorian Andes and is compared with a glacial age pollen record from the Amazon rainforest immediately below. Lake Surucucho (Llaviucu) lies at 3180 m on the Amazonian flank of the Andes and above the glacial age pollen record from San Juan Bosco at 970 m. The Surucucho pollen record is interpreted as showing treeless vegetation in glacial times, advance of treeline in late-glacial time, and Holocene development of modern Andean forests. Combining the Surucucho a

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Alonso, Miguel, Santos-Silva Edinaldo N. dos, and Damià Jaume. "A new species of Notodiaptomus from the Ecuadorian Andes (Copepoda, Calanoida, Diaptomidae)." ZooKeys 697 (September 14, 2017): 59–71. https://doi.org/10.3897/zookeys.697.12204.

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Notodiaptomus cannarensis sp. n. is described from a reservoir on the Amazonian slope of the Ecuadorian Andes. The new species is unique among diaptomid calanoid copepods in the display of hypertrophied, symmetrical wing-like extensions at each side of the female composite genital somite. Furthermore, it displays a female urosome reduced to only two somites due to the incorporation of abdominal somites III and IV to the composite genital double-somite, and a male right fifth leg with the outer spine of second exopodal segment recurved and implanted proximally on margin. It differs from any oth

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Cintra, Renato, and Luciano N. Naka. "Spatial Variation in Bird Community Composition in Relation to Topographic Gradient and Forest Heterogeneity in a Central Amazonian Rainforest." International Journal of Ecology 2012 (2012): 1–25. http://dx.doi.org/10.1155/2012/435671.

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We investigated the effects of landscape features and forest structure on the avian community at the Reserva Florestal Adolpho Ducke near Manaus, in the Brazilian Amazon. We sampled the landscape and forest in 72 50 × 50 m plots systematically distributed in the reserve, covering an area of 6,400 ha. The avifauna was sampled using mist nets and acoustic surveys near the plots. We found no significant relationships between landscape features and forest components in the plots and the number of bird species and individuals sampled. Results of Principal Coordinate Analyses, however, showed that b

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Leon, J. G., F. Seyler, S. Calmant, M. P. Bonnet, and M. Cauhopé. "Hydrological parameter estimation for ungauged basin based on satellite altimeter data and discharge modeling. A simulation for the Caqueta River (Amazonian Basin, Colombia)." Hydrology and Earth System Sciences Discussions 3, no. 5 (2006): 3023–59. http://dx.doi.org/10.5194/hessd-3-3023-2006.

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Abstract. The main objective of this paper is to review the usefulness of altimetric data in ungauged or very poorly monitored basin. It is shown that altimetric measurements can be combined with a single in-situ gauge to derive a reliable stage-discharge relationship upstream from the gauge. The Caqueta River in the Colombian Amazon Basin was selected to simulate a poorly monitored basin. Thus it was possible to derive the stage-discharge relationship for 13 "virtual gauge stations'' defined at river crossing with radar altimetric ground tracks. Stage measurements are derived from altimetric

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ANDRADE, Mariana Silva, Eric Bastos GORGENS, Cristiano Rodrigues REIS, et al. "Airborne laser scanning for terrain modeling in the Amazon forest." Acta Amazonica 48, no. 4 (2018): 271–79. http://dx.doi.org/10.1590/1809-4392201800132.

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ABSTRACT Very few studies have been devoted to understanding the digital terrain model (DTM) creation for Amazon forests. DTM has a special and important role when airborne laser scanning is used to estimate vegetation biomass. We examined the influence of pulse density, spatial resolution, filter algorithms, vegetation density and slope on the DTM quality. Three Amazonian forested areas were surveyed with airborne laser scanning, and each original point cloud was reduced targeting to 20, 15, 10, 8, 6, 4, 2, 1, 0.75, 0.5 and 0.25 pulses per square meter based on a random resampling process. Th

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Dos Santos, Gerson Vilaça, Pedro Ivan das Graças Palheta, Ana Lúcia Soares Machado, and Daniel Nascimento-e-Silva. "Study of the feasibility of intervention to mitigate erosion in the forest fragment of igarapé da vovó in Manaus-AM." Cuadernos de Educación y Desarrollo 16, no. 2 (2024): e3346. http://dx.doi.org/10.55905/cuadv16n2-036.

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The Amazon region can be seen as an immensity of natural resources of all types. However, its diverse ecosystems are fragile, especially its different soil types. Because of the constant and accelerated urbanization of its spaces, several negative externalities occur, such as the silting of miniature river courses, known as streams. In this sense, this study aimed to present a proposal to treat and act to contain the degradation of Igarapé da Vovó and recover the areas surrounding it. To this end, it proposes a corrective intervention using low-impact technology (LID) due to the absence of a w

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Polonik, Pascal, Christoph Knote, Tobias Zinner, et al. "The challenge of simulating the sensitivity of the Amazonian cloud microstructure to cloud condensation nuclei number concentrations." Atmospheric Chemistry and Physics 20, no. 3 (2020): 1591–605. http://dx.doi.org/10.5194/acp-20-1591-2020.

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Abstract. The realistic representation of aerosol–cloud interactions is of primary importance for accurate climate model projections. The investigation of these interactions in strongly contrasting clean and polluted atmospheric conditions in the Amazon region has been one of the motivations for several field campaigns, including the airborne “Aerosol, Cloud, Precipitation, and Radiation Interactions and Dynamics of Convective Cloud Systems–Cloud Processes of the Main Precipitation Systems in Brazil: A Contribution to Cloud Resolving Modeling and to the GPM (Global Precipitation Measurement) (

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VENEGAS, PABLO J., VILMA DURAN, and KARLA GARCIA-BURNEO. "A new species of arboreal iguanid lizard, genus Stenocercus (Squamata: Iguania), from central Peru." Zootaxa 3609, no. 3 (2013): 291–301. http://dx.doi.org/10.11646/zootaxa.3609.3.3.

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We describe a new species of Stenocercus from an interandean valley of the upper Río Huallaga on the Amazonian slope of central Peru (Región Huánuco), at an elevation of 1700–1900 m. The new species differs from other Stenocercus, except S. boettgeri, S. haenschi, S. humeralis, and S. varius, by the combination of the following characters: presence of granular scales on the posterior surface of the thighs, enlarged vertebrals, three caudal whorls per autotomic segment, a medially complete antegular fold, non-spinose caudals, and by males lacking a black transverse band on the ventral surface o

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Franci, Luciana de Campos, Jens-Christian Svenning, Henrik Balslev, Fernando Roberto Martins, and Jacob Nabe-Nielsen. "The demography of a dominant Amazon liana species exhibits little environmental sensitivity." Journal of Tropical Ecology 32, no. 1 (2015): 79–82. http://dx.doi.org/10.1017/s0266467415000553.

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Abstract:Despite its high plant diversity, the Amazon forest is dominated by a limited number of highly abundant, oligarchic tree and liana species. The high diversity can be related to specific habitat requirements in many of the less common species, but fewer studies have investigated the characteristics of the dominant species. To test how environmental variation may contribute to the success of dominant species we investigated whether the vital rates of the abundant liana Machaerium cuspidatum is sensitive to canopy height, topographic steepness, vegetation density, soil components and flo

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Edquén, José D., Jessy P. Arista, Alexander Damián, and Gerardo A. Salazar. "A new species of Liparis (Orchidaceae, Epidendroideae, Malaxidinae) from the Bosque de Protección Alto Mayo, San Martín, Peru." PhytoKeys 224 (April 7, 2023): 89–99. http://dx.doi.org/10.3897/phytokeys.224.98654.

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Liparis altomayoënsissp. nov. is described, illustrated, and tentatively assigned to the Neotropical section Decumbentes on the basis of its branching, prostrate rhizomes and upright stems bearing several leaves. Vegetatively, the new species is distinguished by its short, upward stems bearing 3–6 leaves, these with undulate, translucent margins and reticulate, prominent veining on the upper surface. Florally, it is distinctive in the labellum with fleshy basal one-half provided with a central, rounded cavity limited on each side by a prominent, bilobulate ridge and apically by a lunate ridge,

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Edquén, José D., Jessy P. Arista, Alexander Damián, and Gerardo A. Salazar. "A new species of Liparis (Orchidaceae, Epidendroideae, Malaxidinae) from the Bosque de Protección Alto Mayo, San Martín, Peru." PhytoKeys 224 (April 7, 2023): 89–99. https://doi.org/10.3897/phytokeys.224.98654.

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Liparis altomayoënsis sp. nov. is described, illustrated, and tentatively assigned to the Neotropical section Decumbentes on the basis of its branching, prostrate rhizomes and upright stems bearing several leaves. Vegetatively, the new species is distinguished by its short, upward stems bearing 3–6 leaves, these with undulate, translucent margins and reticulate, prominent veining on the upper surface. Florally, it is distinctive in the labellum with fleshy basal one-half provided with a central, rounded cavity limited on each side by a prominent, bilobulate ridge and apically by a lunate ridge

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de Toledo, José Julio, William Ernest Magnusson, and Carolina Volkmer de Castilho. "Influence of soil, topography and substrates on differences in wood decomposition between one-hectare plots in lowland tropical moist forest in Central Amazonia." Journal of Tropical Ecology 25, no. 6 (2009): 649–56. http://dx.doi.org/10.1017/s0266467409990149.

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Abstract:Understanding how wood decomposition varies spatially at the mesoscale (between 1-ha plots) may improve carbon flux estimates in Amazonian forests. An experiment was carried out to test the influence of soil, slope, above-ground tree live biomass (biomass), fine-litter mass and characteristics of neighbouring trees on the variation of wood decomposition between 1-ha plots in four species of tropical trees that vary in wood density (Manilkara huberi – 0.86 g cm−3, Couratari guianensis – 0.54 g cm−3, Hura crepitans – 0.32 g cm−3 and Parkia pendula – 0.29 g cm−3). A wood sample from each

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Zanchi, Fabrício B., Maarten J. Waterloo, Bart Kruijt, et al. "Soil CO2 efflux in central Amazonia: environmental and methodological effects." Acta Amazonica 42, no. 2 (2012): 173–84. http://dx.doi.org/10.1590/s0044-59672012000200001.

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Soil respiration plays a significant role in the carbon cycle of Amazonian rainforests. Measurements of soil respiration have only been carried out in few places in the Amazon. This study investigated the effects of the method of ring insertion in the soil as well as of rainfall and spatial distribution on CO2 emission in the central Amazon region. The ring insertion effect increased the soil emission about 13-20% for sandy and loamy soils during the firsts 4-7 hours, respectively. After rainfall events below 2 mm, the soil respiration did not change, but for rainfall greater than 3 mm, after

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Wagner, S., I. Fast, and F. Kaspar. "Climatic changes between 20th century and pre-industrial times over South America in regional model simulations." Climate of the Past Discussions 7, no. 5 (2011): 2981–3022. http://dx.doi.org/10.5194/cpd-7-2981-2011.

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Abstract. Two simulations with a regional climate model are analyzed for climatic changes between the late 20th century and a pre-industrial period over central and southern South America. The model simulations have been forced with large-scale boundary data from the global simulation performed with a coupled atmosphere-ocean general circulation model. The regional simulations have been carried out on a 0.44° × 0.44° grid (approx. 50 km × 50 km horizontal resolution). The differences in the external forcings are related to a changed greenhouse gas content of the atmosphere, being higher in the

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ISLER, MORTON L., and MARCOS MALDONADO-COELHO. "Calls distinguish species of Antbirds (Aves: Passeriformes: Thamnophilidae) in the genus Pyriglena." Zootaxa 4291, no. 2 (2017): 275. http://dx.doi.org/10.11646/zootaxa.4291.2.3.

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Populations in the genus Pyriglena Cabanis, 1847, commonly known as fire-eyes, are patchily distributed in central South America from the Pacific slope of the Andes to the Atlantic Forest of Brazil. Pyriglena populations are currently placed into 12 taxa, only five of which are not isolated from their neighbors by distance, a high mountain range, or a major river. In the Thamnophilidae, taxonomic decisions regarding such allopatric populations have primarily rested on differences in vocalizations, thought not to be learned and to play a key role in the speciation process. When we examined Pyri

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Rodríguez-León, Carlos H., Lilia L. Roa-Fuentes, Armando Sterling, and Juan Carlos Suárez. "Plant-Community Vulnerability in Highly Fragmented Landscapes Is Higher in Secondary Forests Than in Old Growth Forests in the Andean–Amazonian Transition." Plants 11, no. 23 (2022): 3284. http://dx.doi.org/10.3390/plants11233284.

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Increasing biodiversity in highly diverse plant communities can jointly increase ecosystem function and ecosystem vulnerability. This paradox requires further attention. This study analyzed the functional response of plant communities to above- and below-ground parameters along the chronosequence (degraded pastures (DP), early forests (EF), intermediate forests (IF), and old-growth forests (OF)) in two highly fragmented landscapes of the Colombian Amazon as an estimate of the level of functional vulnerability. Three sets of functional attributes were evaluated: (i) functional composition based

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Marques, Jean Dalmo de Oliveira, Flávio Jesus Luizão, Wenceslau Geraldes Teixeira, Claudia Marie Vitel, and Elizalane Moura de Araújo Marques. "SOIL ORGANIC CARBON, CARBON STOCK AND THEIR RELATIONSHIPS TO PHYSICAL ATTRIBUTES UNDER FOREST SOILS IN CENTRAL AMAZONIA." Revista Árvore 40, no. 2 (2016): 197–208. http://dx.doi.org/10.1590/0100-67622016000200002.

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ABSTRACT The soil carbon under Amazonian forests has an important roles in global changing, making information on the soil content and depths of these stocks are considerable interest in efforts to quantify soil carbon emissions to the atmosphere.This study quantified the content and soil organic carbon stock under primary forest up to 2 m depth, at different topographic positions, at Cuieiras Biological Reserve, Manaus/ ZF2, km 34, in the Central Amazon, evaluating the soil attributes that may influence the permanence of soil carbon. Soil samples were collected along a transect of 850 m on to

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CARDOSO, IRENE, DÉBORAH ELENA GALVÃO MARTINS, ISRAEL HIDENBURGO ANICETO CINTRA, and FLÁVIO DE ALMEIDA ALVES-JÚNIOR. "First records of Glyphus marsupialis Filhol, 1884 (Decapoda: Pasiphaeidae) in southwestern Atlantic deep waters and extensions of the known distribution of two Pasiphaea species." Zootaxa 5519, no. 1 (2024): 133–42. http://dx.doi.org/10.11646/zootaxa.5519.1.7.

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The Pasiphaeidae Dana, 1852 are a marine shrimp family occurring in both shallow and deeper waters, with its greatest diversity occurring in tropical and subtropical deep seas. This family includes seven genera and 104 species, and is globally distributed. Currently, the genus Pasiphaea Savigny, 1816 includes 73 species, seven of them recorded in the southwestern Atlantic. The genus Glyphus Filhol, 1884 is monotypic and is known from the Indo-Pacific region, the East Pacific Ocean and in the Eastern Atlantic. Herein, we report the first record of the genus in the southwestern Atlantic, complet

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Paiva, R. C. D., W. Collischonn, M. P. Bonnet, and L. G. G. de Gonçalves. "On the sources of hydrological prediction uncertainty in the Amazon." Hydrology and Earth System Sciences 16, no. 9 (2012): 3127–37. http://dx.doi.org/10.5194/hess-16-3127-2012.

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Abstract. Recent extreme events in the Amazon River basin and the vulnerability of local population motivate the development of hydrological forecast systems using process based models for this region. In this direction, the knowledge of the source of errors in hydrological forecast systems may guide the choice on improving model structure, model forcings or developing data assimilation systems for estimation of initial model states. We evaluate the relative importance of hydrologic initial conditions and model meteorological forcings errors (precipitation) as sources of stream flow forecast u

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Paiva, R. C. D., W. Collischonn, M. P. Bonnet, and L. G. G. Gonçalves. "On the sources of hydrological prediction uncertainty in the Amazon." Hydrology and Earth System Sciences Discussions 9, no. 3 (2012): 3739–60. http://dx.doi.org/10.5194/hessd-9-3739-2012.

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Abstract. Recent extreme events in the Amazon River basin and the vulnerability of local population motivate the development of hydrological forecast systems (HFSs) using process based models for this region. In this direction, the knowledge of the source of errors in HFSs may guide the choice on improving model structure, model forcings or developing data assimilation (DA) systems for estimation of initial model states. We evaluate the relative importance of hydrologic initial conditions (ICs) and model meteorological forcings (MFs) errors (precisely precipitation) as sources of stream flow f

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Rojas-Runjaic, Fernando J. M., Edward Camargo, Vinícius T. de Carvalho, and Enrique La Marca. "New record and range extension of the Horned Toad, Rhinella ceratophrys (Boulenger, 1882) (Anura: Bufonidae), in Venezuela, and confirmation of its presence in Brazil." Check List 13, no. 1 (2017): 2035. http://dx.doi.org/10.15560/13.1.2035.

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The Horned Toad, Rhinella ceratophrys, is widely distributed in the northwestern part of the Amazon region. It is known from Venezuela by only a single juvenile from the base of Cerro Marahuaca, Amazonas state. Herein we report four additional specimens from Venezuela: three juveniles also from Cerro Marahuaca, and a subadult female from the southern slopes of Cerro La Neblina, at the southern border of Amazonas state. The specimen from Cerro La Neblina extends the species distribution to the extreme south of Venezuelan Amazonia, 307 km south of Marahuaca, and it represents the southeasternmos

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Wagner, Fabien H., Ricardo Dalagnol, Ximena Tagle Casapia, et al. "Regional Mapping and Spatial Distribution Analysis of Canopy Palms in an Amazon Forest Using Deep Learning and VHR Images." Remote Sensing 12, no. 14 (2020): 2225. http://dx.doi.org/10.3390/rs12142225.

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Mapping plant species at the regional scale to provide information for ecologists and forest managers is a challenge for the remote sensing community. Here, we use a deep learning algorithm called U-net and very high-resolution multispectral images (0.5 m) from GeoEye satellite to identify, segment and map canopy palms over ∼3000 km 2 of Amazonian forest. The map was used to analyse the spatial distribution of canopy palm trees and its relation to human disturbance and edaphic conditions. The overall accuracy of the map was 95.5% and the F1-score was 0.7. Canopy palm trees covered 6.4% of the

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Silva Junior, Celso, Catherine Almeida, Jessflan Santos, Liana Anderson, Luiz Aragão, and Fabrício Silva. "Spatiotemporal Rainfall Trends in the Brazilian Legal Amazon between the Years 1998 and 2015." Water 10, no. 9 (2018): 1220. http://dx.doi.org/10.3390/w10091220.

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Tropical forests play an important role as a reservoir of carbon and biodiversity, specifically forests in the Brazilian Amazon. However, the last decades have been marked by important changes in the Amazon, particularly those associated with climatic extremes. Quantifying the variability of rainfall patterns, hence, is essential for understanding changes and impacts of climate upon this ecosystem. The aim of this study was to analyse spatiotemporal trends in rainfall along the Brazilian Legal Amazon between 1998 and 2015. For this purpose, rainfall data derived from the Tropical Rainfall Meas

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Marinho, Rogério Ribeiro, Jean-Michel Martinez, Tereza Cristina Souza de Oliveira, et al. "Estimating the Colored Dissolved Organic Matter in the Negro River, Amazon Basin, with In Situ Remote Sensing Data." Remote Sensing 16, no. 4 (2024): 613. http://dx.doi.org/10.3390/rs16040613.

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Dissolved organic matter (DOM) is a crucial component of continental aquatic ecosystems. It plays a vital role in the carbon cycle by serving as a significant source and reservoir of carbon in water. DOM provides energy and nutrients to organisms, affecting primary productivity, organic composition, and the food chain. This study presents empirical bio-optical models for estimating the absorption of colored dissolved organic matter (aCDOM) in the Negro River using in situ remote sensing reflectance (Rrs) data. Physical–chemical data (TSS, DOC, and POC) and optical data (aCDOM and Rrs) were col

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