scholarly journals Transpiration rates for several woody successional species and for a pasture in the upper Amazon basin in Venezuela

1990 ◽  
Vol 20 (0) ◽  
pp. 29-38 ◽  
Author(s):  
Jeffrey C. Luvall ◽  
Christopher Uhl
Keyword(s):  
Amazon Basin ◽  
Tritiated Water ◽  
Primary Forest ◽  
Rio Negro ◽  
Time Period ◽  
Successional Species ◽  
Undisturbed Forest ◽  
San Carlos ◽  
The Village ◽  
Established Species

Evapotranspiration rates for a eight month old tropical pasture were estimated using the Penman-Monteith equation. Transpiration rates for several woody secondary successional species and stump sprous in the pasture and conucos (farm sites) were measured using the tritiated water technique.The stuty area was located near the village of San Carlos de Rio Negro (1° 56' N, 67° 03' W) in southern Venezuela, near the confluence of the Casiquiare and the Rio Guania wich forms the Rio Negro. The terrain was gently rolling with the areas between the small ridges supporting Amazon caatina forests on spodosols, and higher never flooded areas (tierra firma) supporting a mixed species forest.Results indicated that for a one month period, ET loss (0.46 cm/day) from the pasture, including soil and root mat evaporation, was about 0.43 cm/day less than estimated from the adjacent undisturbed forest (0.89 cm/day). Pan A evaporation for the same time period was 0.64 cm/day. Transpiration rates for seed established species were significantly less (0.38 cm/day) than for stump sprouts (1.09 cm/day) of the primary forest in the pasture.

scholarly journals The water budget of an amazonian rain forest

1981 ◽  
Vol 11 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Cari F. Jordan ◽  
Jochen Heuveldop
Keyword(s):  
Surface Runoff ◽  
Water Budget ◽  
Rain Forest ◽  
Amazon Basin ◽  
Rio Negro ◽  
Leaf Surfaces ◽  
Stem Flow ◽  
Amazonian Rain Forest ◽  
San Carlos ◽  
Yearly Precipitation

Abstract In a tropical rain forest near San Carlos de Rio Negro, Venezuela, average yearly precipitation from September 1, 1975, through August 31, 1977 was 3664 mm. Throughfall was 87% of precipitation, stem flow was 8%, transpiration was 47%, evaporation from leaf surfaces was 5%, and sub-surface runoff was 48%. These results conform closely to the prediction of Marques et al. (1977) that 48% of the precipitation that falls on the central Amazon Basin is derived from evapotranspiration within the Basin.

UPTAKE OF OXYTOCIN IN TISSUES AFTER INTRAVENOUS ADMINISTRATION OF TRITIATED OXYTOCIN IN RATS

1969 ◽  
Vol 61 (3) ◽  
pp. 432-440 ◽  
Author(s):  
Ingvar Sjöholm ◽  
Gunnar Rydén
Keyword(s):  
Skeletal Muscle ◽  
Distribution Pattern ◽  
Intravenous Injection ◽  
Intravenous Administration ◽  
Time Course ◽  
Tritiated Water ◽  
Preferential Distribution ◽  
Time Period ◽  
Initial Uptake

ABSTRACT The distribution of oxytocin in the kidneys, liver, uterus and skeletal muscle of the rat was followed during 10 min after intravenous injection of tritium labelled oxytocin. Oxytocin was found to be taken up and degraded mainly in the kidneys and the liver. After 150 seconds no intact oxytocin could be detected in these organs. The time course of the distribution of the radioactivity in the liver and the skeletal muscle showed no noteworthy characteristics, whereas a different course was found in the kidneys and in the uterus. In the kidneys, the radioactivity increased continuously from 60 to 200 seconds after the injection, indicating an accumulation of oxytocin or its metabolites in the kidneys. In the uterus a high initial uptake was observed, followed by a decrease of the radioactivity from 60 to 100 seconds after the injection. This distribution pattern was specific to oxytocin, since the uptake of tritiated tyrosine and tritiated water was almost constant during the same time period. These findings may indicate a preferential distribution of oxytocin to the uterus.

The human factors of the sport and recreational fishery of San Carlos de Bariloche, Rio Negro, Argentina

2000 ◽  
Vol 49 (2) ◽  
pp. 141-153 ◽  
Author(s):  
P.H Vigliano ◽  
G Lippolt ◽  
A Denegri ◽  
M Alonso ◽  
P Macchi ◽  
...  
Keyword(s):  
Human Factors ◽  
Rio Negro ◽  
Recreational Fishery ◽  
San Carlos

scholarly journals New species of Cyphocharax (Characiformes: Curimatidae) from the upper rio Negro, Amazon basin

2014 ◽  
Vol 12 (2) ◽  
pp. 327-332 ◽  
Author(s):  
Bruno F. Melo ◽  
Richard P. Vari
Keyword(s):  
New Species ◽  
Amazon Basin ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Rio Negro ◽  
Fin Rays ◽  
Dark Pigmentation ◽  
Northern Brazil ◽  
Adipose Fin ◽  
A New Species

A new species of Cyphocharax, Curimatidae, apparently endemic to the blackwater upper rio Negro of the Amazon basin in northern Brazil, is described.The new species is readily distinguished from its congeners by the presence of a distinctly longitudinally elongate, posteriorly vertically expanding patch of dark pigmentation along the midlateral surface of the caudal peduncle, with the patch extending from the base of the middle caudal-fin rays anteriorly past the vertical through the posterior terminus of the adipose fin. The new species additionally differs from all congeners in details of body and fin pigmentation and meristic and morphometric ratios. Evidence for the assignment of the species to Cyphocharax and the occurrence of other species of the Curimatidae apparently endemic to the upper rio Negro catchment is discussed.

scholarly journals Redescription of Odontostilbe pulchra (Gill, 1858) (Teleostei: Characidae: Cheirodontinae), and description of two new species from the río Orinoco basin

2007 ◽  
Vol 5 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Cristina M. Bührnheim ◽  
Luiz R. Malabarba
Keyword(s):  
New Species ◽  
South America ◽  
Amazon Basin ◽  
Rio Negro ◽  
Species Inquirenda ◽  
Two New Species ◽  
Northern South America

Odontostilbe pulchra, previously considered species inquirenda in Cheirodontinae and doubtfully assigned from the río Orinoco basin, is redescribed with the rediscovery of two syntypes. Originally described to the Island of Trinidad, O. pulchra is widespread in Venezuela, the río Orinoco basin, in smaller coastal drainages of northern South America, in the Lake Valencia system, and río Essequibo basin. A punctual occurrence in the upper rio Negro, near southernmost headwaters of the río Orinoco, extends its distribution to the Amazon basin. Additionally, two new species of Odontostilbe from the río Orinoco basin are described.

scholarly journals Del dicho al hecho: el derecho a la salud en Río Negro, Argentina

2017 ◽  
Vol 22 (65) ◽  
pp. 359-371
Author(s):  
Soledad Analía Perez ◽  
Serena Perner
Keyword(s):  
Rio Negro ◽  
San Carlos

En el presente artículo analizamos la distancia entre el plan de salud vigente en la provincia de Río Negro, Argentina, el marco de oportunidades y recursos que brinda el Estado y las actividades de cuidado que se llevan a cabo en un Centro de Salud ubicado en la ciudad de San Carlos de Bariloche desde un enfoque de derechos. Ponemos en diálogo el plan de salud provincial con las percepciones del personal de dicho centro surgidas de entrevistas en profundidad, observaciones y grupos focales, analizando indicadores de estructura y de proceso.

scholarly journals A taxonomic review of the species of CharaxScopoli, 1777 (Teleostei: Characidae: Characinae) with description of a new species from the rio Negro bearing superficial neuromasts on body scales, Amazon basin, Brazil

2014 ◽  
Vol 12 (2) ◽  
pp. 193-228 ◽  
Author(s):  
Naércio A. Menezes ◽  
Carlos Alberto S. de Lucena
Keyword(s):  
New Species ◽  
Geographic Distribution ◽  
Amazon Basin ◽  
Junior Synonym ◽  
Museum Collections ◽  
Taxonomic Review ◽  
Rio Negro ◽  
Three New Species ◽  
A New Species ◽  
Pelvic Fin

The species of Charaxwere reviewed by Lucena (1987) who a little later (1989) added three new species to the genus. Examination of recently collected specimens from museum collections documented the more extensive geographic distribution for most species and revealed the existence of a new species in which superficial neuromasts were discovered and are herein described. These skin structures were also detected in C. metae Eigenmann, 1922. Anal- and pelvic-fin hooks previously observed only on the anal-fin of one species of the genus are described herein in some other species. Charax unimaculatus Lucena is considered a junior synonym of C. michaeli Lucena. All the species are redescribed and the new species described.

scholarly journals Look Upstream: Measurement for Innovation on the Upper Rio Negro of the Amazon Basin

2021 ◽  
Vol 8 ◽  
Author(s):  
Kurt Shaw ◽  
Rita de Cácia Oenning da Silva
Keyword(s):  
Amazon Basin ◽  
Controlled Trial ◽  
Theory Of Change ◽  
Positive Development ◽  
Private Goods ◽  
Rio Negro ◽  
The Government ◽  
Traditional Songs ◽  
The Impact

The growth of the randomized controlled trial (RCT) as the “gold standard” for evaluation has justly been praised as an advance in the professionalization of social programs and projects, an “adoption of science” - in the words of the Lancet. None the less, the emphasis on the RCT biases funding for projects that distribute private goods and which focus on “low hanging fruit” in health, nutrition, and sanitation, simply because those areas lend themselves to the sort of measurement that works with RCTs. As a result, many project developers in the government and NGO sectors lament that a hegemonic focus on RCTs impedes creativity or new models that challenge traditional paradigms. This case study of CanalCanoa, a community video coaching project for indigenous parents of young children in the Rio Negro region of the Amazon Basin, offers techniques to measure for innovation. Instead of developing a new RCT for an extremely diverse population (27 ethnic groups) where traditional childcare methods are in historical flux because of urbanization, CanalCanoa measured variables shown by previous RCTs to be causally connected with positive development results. By researching the impact of the intervention on nutrition, language (multilingualism, use of traditional songs and stories), and social network expansion, CanalCanoa measured upstream indicators, thus mixing scientific rigor with an opportunity for innovation and providing important insight and reform of a theory of change.

Why Was There a Transition from an Elementary Kinship Structure to a Complex One?

2017 ◽  
Author(s):  
Paul Valentine ◽  
Lionel D. Sims
Keyword(s):  
Social Transformation ◽  
Cousin Marriage ◽  
Historical Material ◽  
Government Project ◽  
Kinship Structure ◽  
The Government ◽  
Parallel Case ◽  
Rubber Boom ◽  
San Carlos ◽  
The Village

During the 1930s in the Venezuelan village of San Carlos de Río Negro, the Baré practiced cross-cousin marriage. However, by the 1980s they married hypergamously among the Curripaco, Geral, and Criollos, all of whom had recently migrated to the village. There is considerable historical material on San Carlos, which when coupled with fieldwork, facilitate the formulation of a number of hypotheses to test what best accounts for this transformation of marital rules. Lévi-Strauss predicted the causes of the breakdown of elementary kinship structures and the creation of complex ones; this chapter suggests an alternative scenario. In a parallel case, Curripaco women migrated to San Carlos in the 1970s and 1980s, could marry someone employed directly or indirectly in the government project, Codesur (Comisión para el Desarrollo del Sur), and became incorporated into the complex kinship structure of this ex–rubber boom village. This chapter suggests their social transformation sheds light on the Baré transformation of some forty years earlier.

scholarly journals Priocharax nanus, a new miniature characid from the rio Negro, Amazon basin (Ostariophysi: Characiformes), with an updated list of miniature Neotropical freshwater fishes

2014 ◽  
Vol 12 (2) ◽  
pp. 229-246 ◽  
Author(s):  
Mônica Toledo-Piza ◽  
George M. T. Mattox ◽  
Ralf Britz
Keyword(s):  
New Species ◽  
Amazon Basin ◽  
Freshwater Fishes ◽  
Diagnostic Character ◽  
Pectoral Fin ◽  
Rio Negro ◽  
Fin Rays ◽  
Pelvic Fin

Priocharax nanus, new species, is described from the rio Negro, Brazil. It is a miniature fish that retains as an adult the larval rayless pectoral fin, a diagnostic character of the genus. Priocharax nanus possesses fewer reductive features compared to congeners, P. ariel and P. pygmaeus, from which it can be distinguished by the presence of i,6 pelvic-fin rays (vs. i,5), the presence of the claustrum (vs. claustrum absent) and the presence of two postcleithra (vs. postcleithra absent). An updated list of 213 species of miniature Neotropical freshwater fishes is presented. The greatest diversity among them is represented by the Characiformes with 87 miniature species.

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