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Journal articles on the topic 'Amazon river and valley'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 August 2024

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1

Kirkbride, Jr., Joseph H. "Manipulus Rubiacearum - V. A revision of the genus Capirona." Acta Amazonica 15, no. 1-2 (1985): 47–60. http://dx.doi.org/10.1590/1809-43921985152060.

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The taxonomic histort of the genus Capirona is presented. Complete synonymies, descriptions, common names, distributions and discussions are given for Capirona and its two species C. descorticans and C. leiophloea. The generic distribution is the Amazon valley and eastern Guianas and coincides with that of the genus Hevea. C. descorticans is know from the western and southeastern Amazon valley; C. leiophloea is reported from the eastern Guianas and the northeastern Amazon valley. The zone of contact between the two species is along the southern edge oh the Amazon River and the lower drainage o

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2

Monteiro, Maurilio de Abreu, Maria Célia Nunes Coelho, and Regiane Paracampos da Silva. "Changes in the relationship between society and nature in the Mezzo-region of Southeastern Pará, Amazon, Brazil." Acta Amazonica 39, no. 4 (2009): 879–87. http://dx.doi.org/10.1590/s0044-59672009000400016.

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With this work, the authors wish to show some of the alterations in the pattern of relations between society and nature, which have taken place throughout the 20th century in the Parauapebas and Itacaiúnas river valleys, as well as in parts of the Tocantins River valley, in southeastern Pará. This is accomplished through descriptions based on Coudreau's first-hand accounts (1889), transcribed in "Voyage a Itaboca et a L'Itacayuna", published in 1897, which depicts an area almost totally covered by forest. This is followed by a counter view made possible through the LandSat 5 satellite sensors,

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3

Nunes, Josué Ribeiro da Silva, Wagner Zago B, Joana da Silva C, Aparecida Lima da Cruz E, and Aparecida dos Santos Galvanin E. "Avifauna of the Upper Guaporé River Valley in Mato Grosso state, Southern Brazilian Amazon Forest." International Journal of Zoology and Animal Biology 7, no. 4 (2024): 1–12. http://dx.doi.org/10.23880/izab-16000597.

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The Guaporé Valley is located in an important transition area between the Cerrado and the Amazon biomes and has a large area of its extent legally protected by Conservation Units or Indigenous Territories. However, the region, inserted in the "deforestation arc", territorial area known for high rates of forest loss, has been changed over the years by the replacement of natural forests by pastures for cattle production. This work aimed to survey the bird population with the current land use in different areas. The research on bird species was performed from March 2012 to January 2013 in eight p

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4

Murdmaa, I. O., O. M. Dara, M. A. Lykova, D. G. Borisov, and E. V. Ivanova. "Mineralogy of Quaternary Sediments from the Valley of Vema Fracture Zone (Central Atlantic)." Океанология 64, no. 1 (2024): 46–65. http://dx.doi.org/10.31857/s0030157424010048.

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The content of sediment forming minerals in two cores from the eastern (ANS45-37) and western (ANS45-48) parts of the Vema transform fault valley is studied using the semi-quantitative XRD analysis of bulk powder sediment samples. The mineral composition of deep-sea sediments from the Amazone cone is also analyzed for comparison. It appeared that the average composition of the terrigenous component of both cores (according to prevailing quartz, secondary mica, plagioclase and potassium feldspar, as well as smectite, chlorite, kaolinite, illite) is quite similar and approximately corresponds to

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5

COLLINS, PABLO A., FEDERICO GIRI, and VERÓNICA WILLINER. "Range extension for three species of South American freshwater crabs (Crustacea: Decapoda: Trichodactylidae)." Zootaxa 1977, no. 1 (2009): 49–54. http://dx.doi.org/10.11646/zootaxa.1977.1.4.

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New sampling programs have extended the distribution of three species of freshwater crabs (family Trichodactylidae): Dilocarcinus septemdentatus and Sylviocarcinus pictus from the Amazon basin to southern South America, and S. australis, from the north of Argentina southwards. The three species are now found in the floodplain of the middle Paraná River (31°39'S, 60°45'W). The extension of their distribution is approximately 500 km and 2000 km further south. The number of freshwater crab species in the alluvial valley of the Paraná River has increased by 30% with these new records.

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6

Webb, Jena, Nicolas Mainville, Donna Mergler, et al. "Mercury in Fish-eating Communities of the Andean Amazon, Napo River Valley, Ecuador." EcoHealth 1, S2 (2004): SU59—SU71. http://dx.doi.org/10.1007/s10393-004-0063-0.

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7

Valenzuela, Pilar M., Luis Márquez Pinedo, and Ian Maddieson. "Shipibo." Journal of the International Phonetic Association 31, no. 2 (2001): 281–85. http://dx.doi.org/10.1017/s0025100301002109.

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The Shipibo language is spoken by about 30,000 people in the Ucayali River valley, in the Upper Amazon watershed in the central eastern part of Peru. The language is sometimes also called Shipibo-Conibo after the two main previously distinct ethnic groups which form its speakers. It is a member of the Panoan family and thus is related to such languages as Capanahua, Amahuaca and Chacobo. Panoan languages are principally found in Peru but the family also has members in Bolivia and Brazil. This description is based on the speech of the second author, a 30-year-old male from the village of Dos Un

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8

Suizu, Tainá Medeiros, Edgardo Manuel Latrubesse, and Maximiliano Bayer. "The Role of Geomorphology on Flood Propagation in a Large Tropical River: The Peculiar Case of the Araguaia River, Brazil." Water 15, no. 21 (2023): 3725. http://dx.doi.org/10.3390/w15213725.

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In large rivers, floods are affected by the mosaic of geomorphic and geologic settings of the fluvial corridor. Here, we assess the role of geomorphology on the downstream flood dynamics of the Araguaia River, the largest free-flowing river in Central Brazil. The study integrates and advances existing flood-type classifications. We assess the factors that govern flood hydrograph properties and their downstream propagation by using flow time series, conducting statistical analysis, and evaluating geomorphic and flood metrics. Our findings highlight the role of geomorphology in the transmission

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9

BEZERRA, ALEXANDRA M. R., and JADER MARINHO-FILHO. "Bats of the Paranã River Valley, Tocantins and Goiás states, Central Brazil." Zootaxa 2725, no. 1 (2019): 41. http://dx.doi.org/10.11646/zootaxa.2725.1.3.

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The Valley of the Paranã River is located in the states Tocantins and Goiás, Brazil. This region is inserted in the transitional area between the Cerrado, a Neotropical Savanna Hotspot, and the Amazon and Caatinga biomes. Transitional zones are alleged to be characterized by high species richness due to the overlap of species distributional ranges, and by a high level of endemism provided by the uniqueness of these regions. The aim of this study was to survey the chiropteran fauna of the Paranã River Valley, analyzing the species composition, richness and endemism, and to contribute with the i

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10

Rosales, Alan G., Clementine Junquas, Rosmeri P. da Rocha, Thomas Condom, and Jhan-Carlo Espinoza. "Valley–Mountain Circulation Associated with the Diurnal Cycle of Precipitation in the Tropical Andes (Santa River Basin, Peru)." Atmosphere 13, no. 2 (2022): 344. http://dx.doi.org/10.3390/atmos13020344.

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The Cordillera Blanca (central Andes of Peru) represents the largest concentration of tropical glaciers in the world. The atmospheric processes related to precipitations are still scarcely studied in this region. The main objective of this study is to understand the atmospheric processes of interaction between local and regional scales controlling the diurnal cycle of precipitation over the Santa River basin located between the Cordillera Blanca and the Cordillera Negra. The rainy season (December–March) of 2012–2013 is chosen to perform simulations with the WRF (Weather Research and Forecasti

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11

Freitas, João Da Luz, Erick Silva Dos Santos, Francisco De Oliveira Cruz Junior, and Adriano Castelo dos Santos. "Extractive activity of Euterpe oleracea Mart. (Acai palm tree) in the Araguari River Valley, Eastern Amazon." Journal of Agricultural Studies 8, no. 2 (2020): 110. http://dx.doi.org/10.5296/jas.v8i2.15679.

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The acai palm tree is a species of multiple use and of great importance for the Amazonian economy and riverside families. The high appreciation of the acai berry in the national and international markets contributes to the search for new producing areas and the reduction of repressed demand. This research aimed to identify the knowledge of the riverside families about the acai berry extraction activity in the Araguari river valley. The study was between the municipalities of Ferreira Gomes and Cutias, in an extension of 80 kilometers. The properties were sampled according to the following crit

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12

Santos, Adriano Castelo dos, Eleneide Doff Sotta, Marcelino Carneiro Guedes, and Lilian Blanc. "Above-ground Biomass Recovery in Managed Tropical Forest in the Jari Valley, Eastern Amazon." Journal of Agricultural Science 11, no. 6 (2019): 129. http://dx.doi.org/10.5539/jas.v11n6p129.

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Tropical forests play an important role in maintaining the regional rainfall regime and global climate, besides representing a significant stock of carbon. This study aimed at evaluate above-ground biomass (AGB) recovery, after reduced-impact logging (RIL) in a managed forest on the Jari River valley. The data were collected in 15 plots (100 m &times; 100 m) in the management area of the Jari Florestal Company. To estimate AGB we used a local equation adjusted for forests in the eastern Amazon. AGB before logging ranged from 157.9 Mg ha-1 to 619.9 Mg ha-1, with an average of 362.5 Mg ha-1.

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13

PEDRO, SILVIA R. M., and JOÃO M. F. CAMARGO. "Neotropical Meliponini: the genus Leurotrigona Moure two new species (Hymenoptera: Apidae, Apinae)." Zootaxa 1983, no. 1 (2009): 23–44. http://dx.doi.org/10.11646/zootaxa.1983.1.2.

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Two new species of Leurotrigona are described: L. crispula sp. nov., from the Magdalena River valley, Antioquia, Colombia, and L. gracilis sp. nov., from western Amazon. Additional geographic records and illustrations are provided for L. muelleri (Friese) and L. pusilla Camargo & Moure, as well as an identification key to the species of the genus. Species can be recognized mainly by pilosity on the face. Morphological characters, including shape of the head and tibia III of the workers, and genitalia and pre-genital sterna of the male are indicative of two distinct groups, one composed of

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14

Alves-Júnior, José Roberto Ferreira, Andréa Cristina Scarpa Bosso, Mariana Batista Andrade, Karin Werther, and André Luiz Quagliatto Santos. "Association of midazolam with ketamine in giant Amazon river turtles Podocnemis expansa breed in captivity." Acta Cirurgica Brasileira 27, no. 2 (2012): 144–47. http://dx.doi.org/10.1590/s0102-86502012000200008.

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PURPOSE: Evaluate the effects of two anesthetic associations in giant Amazon river turtles (P. expansa). METHODS: Twenty P. expansa, healthy, of both sexes, with weights between 1.0 and 1.5 kg of a commercial breeding facility located in the valley of the Araguaia River, Goiás, Brazil, were divided into two groups ( G1 n = 10 and G2 n = 10). Each group received a protocol being: P1 = midazolam (2 mg/kg IM) and ketamine (20 mg/kg IM) and P2 = midazolam (2 mg/kg IM) and ketamine (60 mg/kg IM), applied on G1 and G2, respectively. The drugs were applied in the left forelimb. The clinical parameter

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15

LUZURIAGA-QUICHIMBO, CARMEN X., CARLOS E. CERÓN-MARTÍNEZ, JOSÉ BLANCO-SALAS, TRINIDAD RUIZ-TÉLLEZ, and PEDRO ESCOBAR GARCÍA. "FLORISTIC CATALOGUE OF USEFUL PLANTS FROM A SCARCELY CONTACTED KICHWA INDIGENOUS COMMUNITY IN THE ECUADORIAN AMAZON (PAKAYAKU, PASTAZA, ECUADOR)." Phytotaxa 414, no. 5 (2019): 199–239. http://dx.doi.org/10.11646/phytotaxa.414.5.1.

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Pakayaku is a scarcely contacted community of Kichwa indigenous people situated in the banks of river Bobonaza (Pastaza, Ecuador) at the heart of the Ecuadorian Amazonia. In this paper we present a catalogue of 250 taxa of useful vascular plants belonging to 81 families from the Pakayaku ancestral territories, a so far unexplored area. 126 taxa are first citations for the Bobonaza valley, 22 new for Pastaza province, the largest administrative province of the country, and 1, Pouteria manaosensis, is cited for the first time for Ecuador. In total, approximately 60% of the catalogue consists of

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16

MENIN, MARCELO, ALEXANDRE PINHEIRO DE ALMEIDA, FILLIPE PEDROSO-SANTOS, PATRICK RIBEIRO SANCHES, and CARLOS EDUARDO COSTA-CAMPOS. "Description of the tadpole of Dendropsophus haraldschultzi (Bokermann, 1962) (Anura: Hylidae), with comments on reproductive biology." Zootaxa 4780, no. 3 (2020): 594–600. http://dx.doi.org/10.11646/zootaxa.4780.3.11.

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The genus Dendropsophus Fitzinger contains 108 recognized species (Frost 2020) distributed in nine species groups according to Faivovich et al. (2005). However, recent phylogenetic analysis recognized the presence of nonmonophyletic groups (e.g., Wiens et al. 2010; Fouquet et al. 2011; Motta et al. 2012; Jansen et al. 2019) suggesting that the relationships among species of Dendropsophus require careful revision. Species of this genus are distributed in the tropical and subtropical South America, including Trinidad, southward to northern Argentina and Uruguay and northward to Central America a

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17

Mainville, N., J. Webb, M. Lucotte, et al. "Decrease of soil fertility and release of mercury following deforestation in the Andean Amazon, Napo River Valley, Ecuador." Science of The Total Environment 368, no. 1 (2006): 88–98. http://dx.doi.org/10.1016/j.scitotenv.2005.09.064.

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18

O'HARA, JAMES E. "Henry Walter Bates—his life and contributions to biology." Archives of Natural History 22, no. 2 (1995): 195–219. http://dx.doi.org/10.3366/anh.1995.22.2.195.

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Henry Walter Bates was born in Leicester, England, on 8 February 1825. Early in life he developed a keen interest in natural history in general, and in insects in particular. He met and befriended Alfred Russel Wallace, and in 1848 the two embarked on a collecting expedition to the Amazon Valley. They soon parted company and thereafter collected separately in different areas of Amazonia. Bates returned to England 11 years later, in 1859. He was quick to embrace Darwin's and Wallace's theory of evolution by natural selection, and was one of the first to back the theory with evidence from the na

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19

Alves-Júnior, José Roberto Ferreira, Andréa Cristina Scarpa Bosso, Mariana Batista Andrade, Valéria de Sá Jayme, Karin Werther, and André Luiz Quagliatto Santos. "Association of acepromazine with propofol in giant amazon turtles Podocnemis expansa reared in captivity." Acta Cirurgica Brasileira 27, no. 8 (2012): 552–56. http://dx.doi.org/10.1590/s0102-86502012000800006.

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PURPOSE: To evaluate the effects of different concentrations of an anesthetic association in giant amazon turtles (Podocnemis expansa). METHODS: Twenty healthy P. expansa of both sexes weighing between 1.0 and 1.5kg commercially bred in the Araguaia River Valley, Goias, Brazil, were separated into two groups (G1 n=10 and G2 n=10). Each group received a respective protocol: P1= acepromazine (0.5 mg/kg IM) and propofol (5 mg/kg IV) and P2 = acepromazine (0.5 mg/kg IM) and propofol (10 mg/kg IV). The acepromazine was administered in the left thoracic member and the propofol in the cervical verteb

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20

Shrimpton, Roger, and Helyde Marinho. "Zinc status of riverside populations of the rivers Solimoes and Negro in the state of Amazonas, Brazil." World Nutrition 10, no. 3 (2019): 67–84. http://dx.doi.org/10.26596/wn.201910367-84.

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Zinc nutrition has been shown to be critically limiting among urban populations of the central Amazon valley, but no information on the zinc status of rural populations has been published. Nutrition surveys were carried out on the river Solimoes and the river Negro in years 1976/7. Hair samples collected at that time were analysed for their zinc content, by Atomic Absorption Spectrophotometry. The mean hair zinc value of children aged under seven years from the river Negro (140 µg/g) was about one third lower than hair values from the river Solimoes (204 µg/g) with high statistical significanc

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Da Silva, Greiciane Amorim, Aline Nayara Poscai, and André Luis da Silva Casas. "Injuries Caused by Freshwater Stingrays in the Western Amazon: Folk Medicine and Beliefs." Ethnobiology Letters 11, no. 1 (2020): 1–13. http://dx.doi.org/10.14237/ebl.11.1.2020.1586.

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The envenomation caused by freshwater stingrays is one of the most frequent injuries related to aquatic animals in South America. Such injury is severe with skin necrosis as a probable result of the sting and subsequent intense pain. Here, we characterized the accidents caused by freshwater stingrays in Juruá Valley, Acre, Brazil, with reports of people who had suffered injuries. Data collection was performed in nearby communities in the Juruá River and its tributaries through a semi-structured questionnaire. Bathers and fishermen were the main group affected, and injuries were mainly in the l

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MARTINS, Karina, Raifanny da Silva Oliveira dos SANTOS, Tatiana de CAMPOS, and Lúcia Helena de Oliveira WADT. "Pollen and seed dispersal of Brazil nut trees in the southwestern Brazilian Amazon." Acta Amazonica 48, no. 3 (2018): 217–23. http://dx.doi.org/10.1590/1809-4392201800021.

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ABSTRACT Pollen and seed dispersal patterns greatly influence the spatial distribution of plant genetic diversity. Microsatellite-based parentage analysis provides accurate estimates of contemporary gene dispersal. Although most tropical trees have been shown to exhibit widespread pollen dispersal, few studies have estimated contemporary gene dispersal after seedling establishment. Bertholletia excelsa (Lecythidaceae) is pollinated by large-bodied bees, while previous seed-tracking experiments suggest their seeds are mainly dispersed across very short distances by scatter-hoarding rodents, who

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23

Fan, Y., and G. Miguez-Macho. "Potential groundwater contribution to Amazon evapotranspiration." Hydrology and Earth System Sciences Discussions 7, no. 4 (2010): 5131–70. http://dx.doi.org/10.5194/hessd-7-5131-2010.

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Abstract. Climate and land ecosystem models simulate a dry-season vegetation stress in the Amazon forest, but observations show enhanced growth in response to higher radiation under less cloudy skies, indicating an adequate water supply. Proposed mechanisms include larger soil water store and deeper roots in nature and the ability of roots to move water up and down (hydraulic redistribution). Here we assess the importance of the upward soil water flux from the groundwater driven by capillarity. We present a map of water table depth from observations and groundwater modeling, and a map of poten

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Ramos, Keythiane Freire, Larissa Sbeghen Pelegrini, Jéssica Vieira Sardinha, Rodrigo Tartari, and Marcelo Rodrigues dos Anjos. "Database of the historical series of fisheries production in the middle Madeira River region, southwest of the Amazon, from 2001 to 2013." Latin American Data in Science 1, no. 2 (2021): 72–80. http://dx.doi.org/10.53805/lads.v1i2.27.

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The Amazon is very important regarding the continental extractive fishing as it has the greatest diversity of freshwater fish in the world. Some factors can contribute to identify significant changes in fish production, such as characterization based on common names, and synonyms or classifications only at the genus level. This creates noise in different types of analyzes and mistakes in determining effective productions, as well as levels of exploitation for management. Thus, this study aims to demonstrate the variation in fish production over the years 2001 and 2013, using control data from

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Fan, Y., and G. Miguez-Macho. "Potential groundwater contribution to Amazon evapotranspiration." Hydrology and Earth System Sciences 14, no. 10 (2010): 2039–56. http://dx.doi.org/10.5194/hess-14-2039-2010.

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Abstract. Climate and land ecosystem models simulate a dry-season vegetation stress in the Amazon forest, but observations do not support these results, indicating adequate water supply. Proposed mechanisms include larger soil water store and deeper roots in nature and the ability of roots to move water up and down (hydraulic redistribution), both absent in the models. Here we provide a first-order assessment of the potential importance of the upward soil water flux from the groundwater driven by capillarity. We present a map of equilibrium water table depth from available observations and a g

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Elderfield, Henry, and Edward A. Boyle. "John Marmion Edmond. 27 April 1943 — 10 April 2001." Biographical Memoirs of Fellows of the Royal Society 54 (January 2008): 137–59. http://dx.doi.org/10.1098/rsbm.2008.0011.

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John Edmond was a geochemist the unifying theme of whose research was a quantitative understanding of the processes involved in the transfer of the chemical elements into and out of the oceans; in short, what controls ocean chemistry. He achieved this through oceanographic explorations sampling ocean waters for rare metals and explorations of hot springs on the deep sea floor, rivers from the Amazon to Siberia, and the rift valley lakes of Africa. This accompanied a strong background in chemistry and an almost reverent recognition of the value of data. John challenged established paradigms and

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Hoyos-Gómez, Saúl E., Ricardo Callejas Posada, and Gregory A. Wahlert. "Seven new species of Rinorea (Violaceae) from the Neotropics." PhytoKeys 242 (June 3, 2024): 241–71. http://dx.doi.org/10.3897/phytokeys.242.110474.

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Over the course of revising the genus Rinorea (Violaceae) from Colombia, field observations and herbarium studies revealed seven new species. Several of the new species described here belong to species complexes that required examination of herbarium material from across the Neotropics. Each of the new species described here have oppositely arranged leaves and belong to Rinorea sect. Pubiflorae, a section restricted to the Neotropics. Two new species are segregated from the R. ovalifolia species complex: Rinorea chiribiquetensis from Chiribiquete National Park in the Colombian Amazon and Rinor

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Clark, K. E., A. J. West, R. G. Hilton, et al. "Storm-triggered landslides in the Peruvian Andes and implications for topography, carbon cycles, and biodiversity." Earth Surface Dynamics Discussions 3, no. 3 (2015): 631–88. http://dx.doi.org/10.5194/esurfd-3-631-2015.

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Abstract. In this study, we assess the geomorphic role of a rare, large-magnitude landslide event and consider the effect of this event on mountain forest ecosystems and the erosion of organic carbon in an Andean river catchment. Proximal triggers such as large rain storms are known to cause large numbers of landslides, but the relative effects of such low-frequency, high-magnitude events are not well known in the context of more regular, smaller events. We develop a 25 year duration, annual-resolution landslide inventory by mapping landslide occurrence in the Kosñipata Valley, Peru, from 1988

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Altowairqi, Tahani, and Manal Shafi. "A comprehensive review of the biodiversity of freshwater fish species in Valleys worldwide and in the Kingdom of Saudi Arabia." Journal of Advanced Veterinary and Animal Research 11, no. 2 (2024): 356. http://dx.doi.org/10.5455/javar.2024.k784.

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An overview of freshwater fish variety worldwide and the variables influencing trends in variation between and within river basins are given in this review. Continental freshwater ecosystems are highly diverse and species-rich, housing nearly 18,000 species of fish (>50% of all fish species) in <0.5% of the total land area and providing a negligible (<0.01%) share of the planet’s water supply. Large lowland tropical river basins such as the Amazon, Congo, and Mekong basins are home to the greatest freshwater fish diversity. Freshwater species of fish depth variation at the global mag¬

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Clark, K. E., A. J. West, R. G. Hilton, et al. "Storm-triggered landslides in the Peruvian Andes and implications for topography, carbon cycles, and biodiversity." Earth Surface Dynamics 4, no. 1 (2016): 47–70. http://dx.doi.org/10.5194/esurf-4-47-2016.

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Abstract. In this study, we assess the geomorphic role of a rare, large-magnitude landslide-triggering event and consider its effect on mountain forest ecosystems and the erosion of organic carbon in an Andean river catchment. Proximal triggers such as large rain storms are known to cause large numbers of landslides, but the relative effects of such low-frequency, high-magnitude events are not well known in the context of more regular, smaller events. We develop a 25-year duration, annual-resolution landslide inventory by mapping landslide occurrence in the Kosñipata Valley, Peru, from 1988 to

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Flores Turdera, Cecilia, Guido Ayala, María Viscarra, and Robert Wallace. "Comparison of big cat food habits in the Amazon piedmont forest in two Bolivian protected areas." Therya 12, no. 1 (2021): 75–83. http://dx.doi.org/10.12933/therya-21-1024.

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The feeding habits of jaguar (Panthera onca) and puma (Puma concolor) were studied in the lower Tuichi, Hondo (PNANMI Madidi) and Quiquibey (RB Pilón Lajas) river valleys. A total of 122 large felid scats were collected and identified by an experienced local guide, with identifications later confirmed by morphometry. Of this total, 54 were also identified using associated tracks. For jaguar, prey species richness was 25 species considering all scats and 20 species only considering those scats associated with tracks. For puma, 28 and 22 prey species were obtained, respectively. The results indi

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Grootes, Pieter M., Minze Stuiver, George W. Farwell, Donald D. Leach, and Fred H. Schmidt. "Radiocarbon Dating with the University of Washington Accelerator Mass Spectrometry System." Radiocarbon 28, no. 2A (1986): 237–45. http://dx.doi.org/10.1017/s0033822200007335.

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The University of Washington FN tandem accelerator mass spectrometry (AMS) system has been used in a series of 14C studies. 1) The 14C concentrations in annual growth rings for 1962, 1963, and 1964 of a Sitka spruce, each divided into ten sequential segments, were measured; a full and rapid response of tree-ring cellulose to atmospheric changes in 14CO2 is indicated, with a delay, if any, of not more than three weeks. 2) The C concentrations in two chemical fractions of dissolved organic carbon and in two fractions (by size) of particulate organic carbon were measured for Amazon River samples

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Almeida, Henrique, and Marcondes Costa. "MINERALOGIA, GEOQUÍMICA, FERTILIDADE E ORIGEM DOS SEDIMENTOS DE PRAIA (BARRA EM PONTAL) DAS BACIAS DOS RIOS PURUS E JURUÁ NOS TERRENOS DO ESTADO DO ACRE." Boletim do Museu de Geociências da Amazônia 11, no. 3 (2024): 1–143. http://dx.doi.org/10.31419/issn.2594-942x.v112024i3a3hdfa.

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The Acre state is in the southwestern part of the Brazilian Amazon region with an area of 164.123.738 km2 and a low population density (5.52 inhabitants/km2 for 2021). The geological context is mainly related to recent units that outcrop at the Acre basin and associated with the Solimões Formation, besides old alluvial terraces that follow main drainages. The Solimões Formation comprises fossil-bearing clayey siltstones intercalated to fine sandstones. The old alluvial terraces are composed by sand, silt, clay, and occasionally fossil fragments. The area of the Acre state is crossed by two mai

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Vieira, Diego Dos Santos, João Ricardo Vasconcellos Gama, Márcio Leles Romarco de Oliveira, and Renato Bezerra Da Silva Ribeiro. "ANÁLISE ESTRUTURAL E USO MÚLTIPLO DE ESPÉCIES ARBÓREAS EM FLORESTAS MANEJADAS NO MÉDIO VALE DO RIO CURUÁ-UNA, PARÁ." FLORESTA 45, no. 3 (2015): 465. http://dx.doi.org/10.5380/rf.v45i3.35584.

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O objetivo deste estudo foi avaliar alterações florísticas e estruturais ocorridas em áreas de Floresta Ombrófila Densa no Pará, em decorrência das atividades de exploração de impacto reduzido. Para isso, foram utilizadas duas áreas de floresta não manejada (FNM1 e FNM2) e duas de floresta manejada (FM1 e FM2), explorada há quatro anos, com intensidade de corte de 30 m³.ha-1. Utilizou-se amostragem estratificada, com alocação de 24 parcelas de 28 x 350 m, sendo 12 na FM1 e 12 na FNM1, e 20 parcelas de 50 x 200 m, sendo nove na FM2 e 11 na FNM2, mensurando-se todos os indivíduos com DAP ≥ 10 cm

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Chacón-Pacheco, Julio, Jairo Pérez-Torres, Javier Racero-Casarrubia, Camilo Ramos Madera, Duván J. Bassa-Hernández, and Gerson A. Salcedo-Rivera. "New potential distribution and overlap areas of woolly opossum, genus Caluromys (Didelphimorphia: Didelphidae), in Colombia." Therya 14, no. 3 (2023): 343–49. http://dx.doi.org/10.12933/therya-23-4902.

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The woolly opossums of the genus Caluromys, despite their wide distribution range, are poorly known species. In Colombia, the presence of C. derbianus and C. lanatus is recognized, and the presence of C. philander has been proposed. This study sought to update the distribution and know overlapping areas of the species of the genus Caluromys in Colombia. We modeled the current and potential distribution of C. derbianus and C. lanatus, and discussed the potential presence of C. philander. We extend the distribution range for C. derbianus and C. lanatus by obtaining new records mainly in the Colo

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Cromer, J. J. "A River Valley." Appalachian Heritage 18, no. 3 (1990): 66. http://dx.doi.org/10.1353/aph.1990.0096.

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Arastu, Ali. "Tsola river valley." Wilderness & Environmental Medicine 24, no. 3 (2013): 304. http://dx.doi.org/10.1016/j.wem.2013.03.005.

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Alice Azure. "Connecticut River Valley Awakening." Studies in American Indian Literatures 24, no. 3 (2012): 115. http://dx.doi.org/10.5250/studamerindilite.24.3.0115.

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Anderson, Jeffrey E. "Mississippi River Valley Voodoo." Nova Religio: The Journal of Alternative and Emergent Religions 26, no. 4 (2023): 33–57. http://dx.doi.org/10.1525/nr.2023.26.4.33.

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When visiting New Orleans, it is easy to assume that Voodoo, as practiced by the likes of the nineteenth-century “Voodoo Queen of New Orleans” Marie Laveau, is alive and well, as evidenced by the Voodoo-inspired tourist shops, merchandise, and art that are ubiquitous in the French Quarter. Such is not quite the case. Following more than a century of suppression, the religion that throve into the late nineteenth century was struggling to survive by the 1940s and may have ceased to exist as a living faith shortly thereafter. While some scholars have suggested that the African American Spiritual

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Stokes, Maya F., Samuel L. Goldberg, and J. Taylor Perron. "Ongoing River Capture in the Amazon." Geophysical Research Letters 45, no. 11 (2018): 5545–52. http://dx.doi.org/10.1029/2018gl078129.

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Macfie., J. W. S. "CERATOPOGONIDAE (DIPT.) FROM THE RIVER AMAZON." Proceedings of the Royal Entomological Society of London. Series B, Taxonomy 4, no. 3 (2009): 49–56. http://dx.doi.org/10.1111/j.1365-3113.1935.tb00555.x.

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Johns, Andrew D. "Continuing problems for Amazon river turtles." Oryx 21, no. 1 (1987): 25–28. http://dx.doi.org/10.1017/s0030605300020445.

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Amazon river turtles have a long history of over-exploitation, firstly for oil production, and lately as a luxury food for the expanding human population. In many areas, the populations of the two main commercial species Podocnemis expansa and P. unifilis are now so low that extinction is in sight. In 1985 a WWF-US project aimed at investigating interactions between economic development and wildlife populations conducted a case-study of the exploitation of turtles on the River Tefé in western Brazilian Amazonia.

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Harrison, Cathleen. "Perioperative Nursing on the Amazon River." AORN Journal 54, no. 6 (1991): 1245–50. http://dx.doi.org/10.1016/s0001-2092(07)66873-2.

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Vetorelli, Michelle Pinheiro, Laurindo André Rodrigues, Janaina Mitsue Kimpara, and Wagner Cotroni Valenti. "Intensification of Amazon River Prawn Hatchery." Fishes 9, no. 3 (2024): 82. http://dx.doi.org/10.3390/fishes9030082.

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The effects of the intensification on the performance of the Amazon River prawn hatchery carried out in a simple recirculation system were investigated. Newly hatched larvae were stocked in 120 L tanks at 80, 100, 120 and 140 larvae L−1 in a closed recirculating system. The experiment used a randomized block design with five replicates. An exponential equation was adjusted to express the relationship between the stocking density and productivity (postlarvae L−1). The development, larval quality, survival and postlarval (PL) dry weight did not significantly differ among the treatments (p > 0

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Liu, Jianrui. "Amazon River Delta Suspended Sediment Analysis." Applied and Computational Engineering 3, no. 1 (2023): 293–99. http://dx.doi.org/10.54254/2755-2721/3/20230484.

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This study focuses on the variation of suspended sediment concentrations in the Amazon River basin near Macapa, Brazil for each season between 2016 and 2020. The suspended sediment concentrations were calculated by spectral analysis of satellite images obtained by Landsat 8-9 OLI/TIRS in the study area. The effects of seasonality, discharge, and precipitation on suspended sediment concentrations in the Amazon Delta were also investigated in conjunction with discharge and precipitation data in the Amazon River basin near Macapa. Findings showed that precipitation was a strong driver of SSC incr

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Derzi Vidal, Marcelo, Priscila Maria Da Costa Santos, Miriam Marmontel, Jailson Fulgêncio de Moura, and Salvatore Siciliano. "Easy food in the jungle: evaluating presence and relationships of Amazon River dolphin (Inia geoffrensis) at a provisioning site in the Amazon, Brazil." Latin American Journal of Aquatic Mammals 17, no. 1 (2022): 43–50. http://dx.doi.org/10.5597/lajam00282.

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Provisioning food to wildlife is a strategy used to habituate animals to human proximity during tourism activities, but it can contribute to changes in individual behavior and social structure and impacts on the nutritional health status. This article evaluates the presence and relationships of Amazon River dolphins (Inia geoffrensis) in feeding sessions at a floating house in Anavilhanas National Park, Brazil. The Amazon River dolphins most frequently observed during the study period also presented higher constancy in the feeding sessions. Food provisioning had a variable impact on Amazon Riv

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Phillips, Roger T. J., and André Robert. "River Incision in Relation to Post-Glacial Events in the Humber River Basin, Ontario." Géographie physique et Quaternaire 59, no. 1 (2006): 17–30. http://dx.doi.org/10.7202/013734ar.

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Abstract River valleys in the Humber River drainage basin have derived most of their morphology from processes occurring over the last 13 000 14C BP. Some of the valley reaches possess very distinct characteristics in terms of plan-view morphology, such as valley meandering and loop features along the valley sides. In this study, the valley morphology and stratigraphy of the upper Humber River basin are examined in order to assess the character of post-glacial valley evolution. Existing knowledge of late Wisconsinan and Holocene events has been considered to place this valley evolution into a

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Maslin, Mark A., and Stephen J. Burns. "Reconstruction of the Amazon Basin Effective Moisture Availability over the Past 14,000 Years." Science 290, no. 5500 (2000): 2285–87. http://dx.doi.org/10.1126/science.290.5500.2285.

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Quantifying the moisture history of the Amazon Basin is essential for understanding the cause of rain forest diversity and its potential as a methane source. We reconstructed the Amazon River outflow history for the past 14,000 years to provide a moisture budget for the river drainage basin. The oxygen isotopic composition of planktonic foraminifera recovered from a marine sediment core in a region of Amazon River discharge shows that the Amazon Basin was extremely dry during the Younger Dryas, with the discharge reduced by at least 40% as compared with that of today. After the Younger Dryas,

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Bell, Gerald D., and Michael S. Halpert. "Climate Assessment for 1997." Bulletin of the American Meteorological Society 79, no. 5s (1998): S1—S50. http://dx.doi.org/10.1175/1520-0477-79.5s.s1.

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The global climate during 1997 was affected by both extremes of the El Niño-Southern Oscillation (ENSO), with weak Pacific cold episode conditions prevailing during January and February, and one of the strongest Pacific warm episodes (El Niño) in the historical record prevailing during the remainder of the year. This warm episode contributed to major regional rainfall and temperature anomalies over large portions of the Tropics and extratropics, which were generally consistent with those observed during past warm episodes. In many regions, these anomalies were opposite to those observed during

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Grossman, Daniel. "A river in flux." Science 383, no. 6684 (2024): 692–97. http://dx.doi.org/10.1126/science.ado6281.

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