Search

Este trabajo tiene como principal foco de indagación al periódico El Argentino de Paraná redactado por el poeta José Hernández durante el año 1863. En el marco de los lamentos y las decepciones de las consecuencias de Pavón, interesa de modo particular, examinar el eje de su discurso vinculado a su percepción sobre los soldados que intervinieron en aquel ultimo acontecimiento, pero también la del escritor público y la vida política de los inicios de aquella década vinculada con la emergencia de una serie de emociones. Para la figura del soldado y el escritor público se emplea la noción de “operativo de transferencia”, por la cual, siguiendo la estela de Adolfo Prieto, una figura puede ser absorbida por la otra en el contexto del proceso del recorrido de ambos por la acción de una de ellas. La coyuntura y la deriva de la prensa entrerriana con relación a las autoridades provinciales y nacionales resultan clave para entender su eficacia.

The Balbina hydroelectric dam was built in the 1980s on the Uatumã River to supply electricity to Manaus, capital of the state of Amazonas, Brazil. Its construction caused a drastic change to the alluvial landscape, forming a large, lentic, artificial reservoir rather than a previously dynamic river system. The objective of our research was to evaluate the impact of the hydroelectric dam on the microevolutionary processes of fish, taking as a model Cichla temensis, an iconic non-migratory fish from the Amazon, abundant in this ecosystem. We collected double digest restriction site-associated DNA sequencing data and extracted single nucleotide polymorphisms, which we identified at neutral and adaptive loci, for subsequent analyses. The results showed that the connectivity of the population was affected historically by natural physical barriers, before the construction of the hydroelectric dam, recognizing two independent population units. We detected that the hydroelectric dam increased the differentiation between populations and affected the genetic diversity and effective population sizes, in addition to promoting a recent population expansion upstream of the dam, as a consequence of adaptation to the new environment. This study provides the first evidence that hydroelectric dams can promote local adaptation in some fish, such as non-migratory ones. [ABSTRACT FROM AUTHOR]

The speckled peacock bass Cichla temensis is a popular sport and food fish that generates substantial angling tourism and utilitarian harvest within its range. Its popularity and value make this species important for management and a potential aquaculture candidate for both fisheries enhancement and food fish production. However, little is known of optimal physiochemical conditions in natural habitats, which also are important for the development of hatchery protocols for handling, spawning and grow‐out. Speckled peacock bass have been documented to have high sensitivity to extreme temperatures, but the metabolic underpinnings have not been evaluated. In this study, the effects of temperature (25, 30 and 35°C) on the standard metabolic rate (SMR) and lower dissolved oxygen tolerance (LDOT) of juvenile speckled peacock bass (mean ± standard error total length 153 ± 2 mm and wet weight 39.09 ± 1.37 g) were evaluated using intermittent respirometers after an acclimation period of 2 weeks. Speckled peacock bass had the highest SMR at 35°C (345.56 ± 19.89 mgO2 kg−1 h−1), followed by 30°C (208.16 ± 12.45 mgO2 kg−1 h−1) and 25°C (144.09 ± 10.43 mgO2 kg−1 h−1). Correspondingly, the Q10, or rate of increase in aerobic metabolic rate (MO2) relative to 10°C, for 30–35°C was also greater (2.76) than from 25 to 30°C (2.08). Similarly, speckled peacock bass were the most sensitive to hypoxia at the warmest temperature, with an LDOT at pO2 of 90 mmHg (4.13 mg l−1) at 35°C compared to pO2 values of 45 mmHg (2.22 mg l−1) and 30 mmHg (1.61 mg l−1) at 30 and 25°C, respectively. These results indicate that speckled peacock bass are sensitive to temperatures near 35°C, therefore we recommend managing and rearing this species at 25–30°C. [ABSTRACT FROM AUTHOR]

This article engages a pervasive discourse on decency in twenty-first-century social mores and state prohibitions by examining artists' work (2016–2019) that speaks to how material culture and aesthetic judgment feed into the aesthetic hegemony of the Cuban state. Attention is paid to three cases that unravel a national and international staging of a universal "decent" Cuban culture in the post-Obama era: (1) the 2017 intervention Where is Mella? by "amateur" artist Luis Manuel Otero Alcántara, who called attention to the Cuban military's commercial alliance with Kempinksi, the Swiss/German hotel group, critiquing Cuba's new landscape of luxury; (2) Pluto (2016), video art by Geandy Pavón that alludes to a chain of embezzlements and substitutions; and (3) the performances of two "amateur" musicians: Chocolate MC, who, though popular, is also deemed repulsive on both sides of the Florida Straits, and Cimafunk, celebrated as a cultural ambassador. A contemplation on "excess" – a 5-star hotel, junk jewellery, or bling bling – allows for questions of who the Cuban state recognises as an artist, how artists appropriate and expropriate ideas of luxury and refinement, and whether these substitutions can sufficiently erode colonial legacies that continue to contain those subjectivities perceived as excessive. [ABSTRACT FROM AUTHOR]

Copyright of Revista del Museo de Antropología is the property of Museo de Antropologia - IDACOR and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Since the last complete revision of Psammisia (Ericaceae: Vaccinieae) in 1932 many new species, synonyms, and local treatments have been published and genetic information is slowly becoming available. This paper is based on field and herbarium observations made over a period of nearly 50 years and helps to clarify questions of typification and species relationships towards an updated revision. Emphasis is herein given to species occurring in Peru and Bolivia for which a key to the species occurring in that region is made available for the first time. Notes on the poorly understood yet historically important collections of Ruiz & Pavón, Humboldt & Bonpland, Mathews, the Schomburgk brothers, and Linden, Funck, & Schlim are provided as they refer to South American Ericaceae. Neotypes for Thibaudia formosa and Thibaudia nutans are also included. One new combination, Psammisia costeroides (Sleumer) Luteyn, is made. [ABSTRACT FROM AUTHOR]

Despite being one of the most well-known cichlid fish of importance to artisanal and sport fishing, and among the largest fishes in the Neotropics, data on digestive tract anatomy of peacock basses (Cichla spp.) are largely lacking, especially for non-native populations. in this paper, we describe for the first time the digestive tract morphology of Cichla kelberi, a voracious piscivore that was introduced in the 1950s into an oligotrophic and physically low-complex impoundment in Brazil. Peacock basses were collected between 1994 and 2002 in Lajes Reservoir, through gillnets (25 to 55mm mesh; 20-50x2m), seines (10x2.5m; 8.0mm mesh), cast nets and angling. All the fishes were kept on ice in the field and then transferred to the laboratory, where they were identified, measured, weighed and dissected for digestive tract analyses. The index of Relative importance-IRI was calculated for diet characterization while linear and non-linear regressions were performed to assess growth patterns of four morphological characters related to feeding (e.g. mouth width, mouth height, stomach length and intestine length) and the number of gill rakers during the C. kelberi ontogeny. Most digestive tract structures were directly related to the piscivorous diet of C. kelberi, indicating that peacock bass is a diurnal, bathypelagic and gape-size limited predator that feeds largely on shallow-water prey species within the littoral zone. Mouth width and height grew allometrically (b>1) with the size of peacock bass, broadening the size range in which prey can be eaten, but especially for predators smaller than ~400mm of total length. Differently, stomach and intestine lengths increased isometrically (b=1), which could constrain prey consumption for adult C. kelberi, especially those at advanced stages of gonadal maturation. The presence of longer-drawn, sharp and furcated gill rakers in C. kelberi may be related to increased prey retention in the resource-limited Lajes Reservoir, but further studies are necessary whether such features are randomly triggered by genetic or phenotypic anomalies, or effectively bring ecological advantages to the predator. In addition to contribute to improve the current biological knowledge on peacock basses, our results can be also useful to further comparisons on whether those morphological features related to feeding will change with transitions on prey consumption by C. kelberi and/or with the particular conditions of the invaded ecosystem. Rev. Biol. Trop. 59 (3): 1245-1255. Epub 2011 September 01.

No disponible

A poco de obtener el grado de doctor en jurisprudencia en la Universidad de Buenos Aires, Estanislao S. Zeballos, que no obstante su juventud había concretado ya diversas iniciativas culturales y ejercido el periodismo de batalla, adhirió a la revolución encabezada por el general Bartolomé Mitre en 1874 para oponerse a la asunción del presidente Nicolás Avellaneda. Fue nombrado capitán y secretario del comandante en jefe. Durante la campaña escribió un relato de sus días infantiles en la ciudad de Rosario y acerca de su ingreso al Colegio Nacional, y un boceto sobre el clima político previo a la elección de Avellaneda como presidente de la República.

Despite being one of the most well-known cichlid fish of importance to artisanal and sport fishing, and among the largest fishes in the Neotropics, data on digestive tract anatomy of peacock basses (Cichla spp.) are largely lacking, especially for non-native populations. In this paper, we describe for the first time the digestive tract morphology of Cichla kelberi, a voracious piscivore that was introduced in the 1950s into an oligotrophic and physically low-complex impoundment in Brazil. Peacock basses were collected between 1994 and 2002 in Lajes Reservoir, through gillnets (25 to 55mm mesh; 20-50x2m), seines (10x2.5m; 8.0mm mesh), cast nets and angling. All the fishes were kept on ice in the field and then transferred to the laboratory, where they were identified, measured, weighed and dissected for digestive tract analyses. The index of Relative importance-IRI was calculated for diet characterization while linear and non-linear regressions were performed to assess growth patterns of four morphological characters related to feeding (e.g. mouth width, mouth height, stomach length and intestine length) and the number of gill rakers during the C. kelberi ontogeny. Most digestive tract structures were directly related to the piscivorous diet of C. kelberi, indicating that peacock bass is a diurnal, bathypelagic and gape-size limited predator that feeds largely on shallow-water prey species within the littoral zone. Mouth width and height grew allometrically (b>1) with the size of peacock bass, broadening the size range in which prey can be eaten, but especially for predators smaller than ~400mm of total length. Differently, stomach and intestine lengths increased isometrically (b=1), which could constrain prey consumption for adult C. kelberi, especially those at advanced stages of gonadal maturation. The presence of longer-drawn, sharp and furcated gill rakers in C. kelberi may be related to increased prey retention in the resource-limited Lajes Reservoir, but further studies are necessary whether such features are randomly triggered by genetic or phenotypic anomalies, or effectively bring ecological advantages to the predator. In addition to contribute to improve the current biological knowledge on peacock basses, our results can be also useful to further comparisons on whether those morphological features related to feeding will change with transitions on prey consumption by C. kelberi and/or with the particular conditions of the invaded ecosystem. Rev. Biol. Trop. 59 (3): 1245-1255. Epub 2011 September 01. [ABSTRACT FROM AUTHOR]

Copyright of Temas de Historia Argentina y Americana is the property of Pontificia Universidad Catolica Argentina and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Artificial incubation is a favorable technique for reproduction programs of threatened or endangered species. However, implementing a method for monitoring the incubation process is highly important. Temperature and humidity are key physical parameters for egg incubation leading to successful hatching. We used artificial incubation as an alternative to natural incubation of the Horned Guan Oreophasis derbianus. Weight and density loss were used to monitor the incubation process of the eggs, considering a final weight and density loss of 15%. Before incubation, the eggs weighed an average of 161.04 ± 9.87 g (n = 24) and measured 85.57 ± 3.16 mm × 57.52a ± 1.31 mm (n = 15). Density and volume averages of eggs were 1.08 ± 0.036 g-cm3 (n = 15) and 142.40 ± 10.46 g-cm3 (n = 15), respectively. Of 24 eggs, 15 (62.5%) were fertile, and seven resulted in successful hatching (46.6% hatch). The pip to hatch time in two eggs was 14 y 19 hours, respectively. The eggs were incubated at a temperature of 37.5°C (dry bulb) and a relative humidity of 53-56% (28.8-30.1°C) (wet bulb) throughout the 33-35 day incubation period. In eight cases, the embryos reached full development but failed to hatch successfully, likely due to improper humidity levels. This is the first published record of Horned Guan artificial incubation parameters and its monitoring process. [ABSTRACT FROM AUTHOR]

The recent World Malaria report shows that progress in malaria elimination has stalled. Current data acquisition by NMCPs depend on passive case detection and clinical reports focused mainly on Plasmodium falciparum (Pf). In recent times, several countries in sub-Saharan Africa have reported cases of Plasmodium vivax (Pv) with a considerable number being Duffy negative. The burden of Pv and Plasmodium ovale (Po) appear to be more than acknowledged. Similarly, the contribution of asymptomatic malaria in transmission is hardly considered by NMCPs in Africa. Inclusion of these as targets in malaria elimination agenda is necessary to achieve elimination goal, as these harbor hypnozoites. The Pan African Vivax and Ovale Network (PAVON) is a new consortium of African Scientists working in Africa on the transmission profile of Pv and Po. The group collaborates with African NMCPs to train in Plasmodium molecular diagnostics, microscopy, and interpretation of molecular data from active surveys to translate into policy. Details of the mission, rational and modus operandi of the group are outlined. [Display omitted] • Current malaria elimination efforts in Africa are focused only on Pf. • Data to inform policy on malaria prevalence is from passive case detection and clinical presentation. • Active case detection for Pv and Po is needed for elimination to succeed. • Use of molecular tools to include asymptomatic infections will refine the true prevalence. [ABSTRACT FROM AUTHOR]

In their native habitats of black- and clear-water Neotropical rivers, large predatory cichlids of the genus Cichla are an important food and recreational resource. Understanding patterns of movement for these species is necessary for effective management and conservation; however, no information is available on movement in natural fluvial populations. Therefore, we initiated a cooperative mark-recapture program with local sport-fishing groups to evaluate movement of Cichla in the Cinaruco River, Venezuela and to promote conservation awareness. Between January 1999 and May 2003, we tagged 2,224 individuals of three species of Cichla (C. temensis, C. orinocensis, and C. intermedia) with uniquely numbered floy tags. Over 52 months, 2.8% of the tagged fishes were recaptured. Most recaptures occurred within 1 km of the tagging location; however, a few large C. temensis moved up to 21 km, demonstrating the potential for longer distance movement in this species. The distance between tagging and recapture locations was not significantly correlated with the time interval between tagging and recapture. Distance moved was significantly related to fish size and period of the annual hydrological cycle. Implications for management and conservation of these species and future research directions are discussed.