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4. Fine Sediment Input and Benthic Fauna Interactions at the Confluence of Two Large Rivers

Author

Blettler, M. C. M., Amsler, M. L., Ezcurra Drago, I., Drago, E., Aldo Raúl Paira, Espinola, L. A., Eberle, E., and Szupiany, R.

Subjects
Ciencias Biológicas, FINE SEDIMENT LOAD, LARGE RIVER, Otras Ciencias Biológicas, SEDIMENTOLOGY, CHANNEL CONFLUENCE, CIENCIAS NATURALES Y EXACTAS, BENTHIC INVERTEBRATE
Abstract

Several studies suggest that invertebrate abundance and richness are disrupted and reset at confluences. Thus, junctions contribute disproportionately to the overall aquatic biodiversity of the river. In general terms, authors have reported high abundance and diversity due to the major physical heterogeneity atjunctions. However, data are still scarce and uncertainties are plentiful. The impact of a great input of fine sediments on the distribution patterns of benthic invertebrates at a river confluence was quantitatively analyzed herein. The junction of the subtropical Bermejo River (high suspended sediment load) with the large Paraguay River is the selected study area to achieve this aim. While diversity increased slightly downstream the junction (from 0.21 to 0.36), density and richness of the macroinvertebrate assemblage significantly diminished downstream the confluence (from 29050 to 410 ind/m2; p< 0.05) due to the input of fine sediment from the Bermejo River (mean fine sediment increased downstream from 6.3 to 10.2 mg/L), causing a negatively impact on invertebrate assemblage. This study highlights the ecological importance of the sediment input effects on benthic invertebrates, a topic still poorly explored in river ecology. It is speculated that the spatial extent of the impact would be dependent upon the hydrological and sedimentological context, highly unequal between both rivers. New hypotheses should be tested through new studies considering different hydrological stages. Fil: Blettler, Martin Cesar Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Amsler, Mario Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Ezcurra de Drago, Inés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Drago, Edmundo Carlos E.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Paira, Aldo Raul. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Espínola, Luis Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Eberle Folmer, Eliana Gisel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentina Fil: Szupiany, Ricardo Nicolas. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Litoral. Facultad de Ingeniería y Ciencias Hídricas; Argentina

Published
2016

6. P53 NEISSERIA GONORRHOEAE INFECTIVE ENDOCARDITIS. A CASE REPORT

Author

Querci, M., primary, Rombini, F., additional, Espinola, L., additional, Boutureira, M., additional, Yetman, M., additional, Reyes, D., additional, Solis, C., additional, Gargiulo, R., additional, Galarza, P., additional, Muzzio, M., additional, Lamelas, A., additional, Coronel, R., additional, Guastavino, D., additional, Lambertini, R., additional, and Nacinovich, F., additional

Published
2013
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8. Knowledge, attitudes and perceptions of Latin American healthcare workers relating to antibiotic stewardship and antibiotic use: a cross-sectional multi-country study.

Author

Fabre V, Cosgrove SE, Lessa FC, Patel TS, Reyes-Morales G, Aleman WR, Alvarez AA, Aquiles B, Arauz AB, Arguello F, Barberis MF, Barcan L, Bernachea MP, Bernan ML, Buitrago C, Del Carmen Bangher M, Castañeda X, Colque AM, Canton A, Contreras R, Correa S, Campero GC, Espinola L, Esquivel C, Ezcurra C, Falleroni LA, Fernandez J, Ferrari S, Frassone N, Cruz CG, Garzón MI, Quintero CHG, Gonzalez JA, Guaymas L, Guerrero-Toapanta F, Lambert S, Laplume D, Lazarte PR, Lemir CG, Lopez A, Lopez IL, Maldonado H, Martinez G, Maurizi DM, Melgar M, Mesplet F, Pertuz CM, Moreno C, Moya GL, Nuccetelli Y, Núñez G, Osuna C, Palacio B, Pellice F, Raffo C, Choto FR, Ricoy G, Rodriguez V, Romero F, Romero JJ, Russo ME, Sadino G, Sandoval N, Silva MG, Urueña AM, Reyes LV, Videla H, Valle M, Perez SVA, Vergara-Samur H, Villamandos S, Villarreal O, Viteri A, Warley E, and Quiros RE

Subjects
Humans, Cross-Sectional Studies, Latin America, Female, Male, Surveys and Questionnaires, Adult, Middle Aged, Antimicrobial Stewardship, Health Knowledge, Attitudes, Practice, Anti-Bacterial Agents therapeutic use, Health Personnel psychology, Attitude of Health Personnel
Abstract

Background: The burden of antimicrobial resistance (AMR) in Latin America is high. Little is known about healthcare workers' (HCWs) knowledge, attitudes, and perceptions of antimicrobial stewardship (AS), AMR, and antibiotic use (AU) in the region., Methods: HCWs from 42 hospitals from 5 Latin American countries were invited to take an electronic, voluntary, anonymous survey regarding knowledge, attitudes, and perceptions of AS, AMR, and AU between March-April 2023., Findings: Overall, 996 HCWs completed the survey (52% physicians, 32% nurses, 11% pharmacists, 3% microbiologists, and 2% "other"). More than 90% of respondents indicated optimizing AU was a priority at their healthcare facility (HCF), 69% stated the importance of AS was communicated at their HCF, and 23% were unfamiliar with the term "antibiotic stewardship". Most (> 95%) respondents acknowledged that appropriate AU can reduce AMR; however, few thought AU (< 30%) or AMR (< 50%) were a problem in their HCF. Lack of access to antibiogram and to locally endorsed guidelines was reported by 51% and 34% of HCWs, respectively. Among prescribers, 53% did not consider non-physicians' opinions to make antibiotic-related decisions, 22% reported not receiving education on how to select antibiotics based on culture results and 60% stated patients and families influence their antibiotic decisions., Conclusions: Although HCWs perceived improving AU as a priority, they did not perceive AU or AMR as a problem in their HCF. AS opportunities include improved access to guidelines, access to AMR/AU data, teamwork, and education on AS for HCWs and patients and families., (© 2024. The Author(s).)

Published
2024
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9. Short communication: fasting increases serum concentrations of bilirubin in patients receiving atazanavir: results from a pilot study.

Author

Lopardo G, Bissio E, Espinola L, Gallego P, Stambullian M, and Gadano A

Subjects
Adult, Anti-HIV Agents therapeutic use, Atazanavir Sulfate, Female, Humans, Male, Middle Aged, Oligopeptides therapeutic use, Pyridines therapeutic use, Serum chemistry, Anti-HIV Agents adverse effects, Bilirubin blood, Fasting, HIV Infections drug therapy, Hyperbilirubinemia chemically induced, Hyperbilirubinemia diagnosis, Oligopeptides adverse effects, Pyridines adverse effects
Abstract

Unconjugated hyperbilirubinemia resulting from therapy with atazanavir is physiologically related to hyperbilirubinemia in Gilbert's syndrome (GS). In patients with GS, changes in diet have a significant impact on bilirubinemia. Our aim was to investigate whether changes in diet affect the level of serum bilirubin in patients receiving atazanavir. Thirty patients on stable therapy with ritonavir-boosted atazanavir without evidence of GS were enrolled. Hemolysis and chronic hepatitis were excluded. After a baseline period of normal intake of calories, the patients were randomized to follow a 24-h 400-calorie diet (fasting), then a 48-h period of normal calorie intake and, afterward, a 24-h period of a high-calorie diet, or the same interventions in inverse order. Serum bilirubin concentrations were measured before and after each intervention. A high adherence to the recommended diet was observed. The mean unconjugated bilirubin concentration before the high-calorie diet was 2.79±1.53 mg/dl and after such intervention it was 2.70±1.40 mg/dl. The mean difference between preintervention and postintervention was -0.08±0.69 mg/dl (p=NS). The mean unconjugated bilirubin concentration before the fasting diet was 2.31±1.23 mg/dl and it was 3.84±1.90 mg/dl after. The mean difference between prefasting and postfasting was 1.53±1.17 mg/dl (p=0.001). According to these results, short periods of fasting seem to increase the unconjugated bilirubin concentration in patients on atazanavir. A high-calorie diet did not have any impact in bilirubin probably because most patients follow similar diets in their everyday life.

Published
2013
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