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  • Argentina  (1)
  • Calcium salts  (1)
  • Caribbean Sea  (1)
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  • 1
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    In:  http://aquaticcommons.org/id/eprint/16697 | 9602 | 2016-05-04 14:28:48 | 16697 | Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina
    Publikationsdatum: 2021-07-08
    Beschreibung: La glaciaciones ocurridas en la región expusieron en diferente grado la actual plataforma continental Argentina (océano Atlántico sudoccidental). Este trabajo de divulgación científica da a conocer un modelo de evolución paleogeográfica de las costas de la Pampa y la Patagonia, y brinda la posibilidad de localizar temporalmente la formación de los principales rasgos costeros del extremo sur de América del sur. Se incluyen además otras lecturas sugeridas relacionadas al tema.
    Beschreibung: Reprinted as: pp.11-17 in, Ciencia del Mar. Volumen temático 1, 12/2014; Asociación Ciencia Hoy. ISBN: 978-987-45584-0-4 (Special issue dedicated to 'Marine Sciences: 1988-2014')
    Schlagwort(e): Biology ; Ecology ; Oceanography ; PSW ; Argentina ; marine environment ; Continental shelves ; shelf geology ; glaciation ; palaeogeography ; sea level changes ; models
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 50-56
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2021-07-01
    Beschreibung: Background:The rising temperature of the world’s oceans has become a major threat to coral reefs globally as the severityand frequency of mass coral bleaching and mortality events increase. In 2005, high ocean temperatures in the tropicalAtlantic and Caribbean resulted in the most severe bleaching event ever recorded in the basin.Methodology/Principal Findings:Satellite-based tools provided warnings for coral reef managers and scientists, guiding both the timing and location of researchers’ field observations as anomalously warm conditions developed and spread across the greater Caribbean region from June to October 2005. Field surveys of bleaching and mortality exceeded prior efforts in detail and extent, and provided a new standard for documenting the effects of bleaching and for testing nowcast and forecast products. Collaborators from 22 countries undertook the most comprehensive documentation of basin-scale bleaching to date and found that over 80% of corals bleached and over 40% died at many sites. The most severe bleaching coincided with waters nearest a western Atlantic warm pool that was centered off the northern end of the Lesser Antilles.Conclusions/Significance:Thermal stress during the 2005 event exceeded any observed from the Caribbean in the prior 20 years, and regionally-averaged temperatures were the warmest in over 150 years. Comparison of satellite data against field surveys demonstrated a significant predictive relationship between accumulated heat stress (measured using NOAA CoralReef Watch’s Degree Heating Weeks) and bleaching intensity. This severe, widespread bleaching and mortality willundoubtedly have long-term consequences for reef ecosystems and suggests a troubled future for tropical marine ecosystems under a warming climate
    Beschreibung: NOAA Coral Reef Conservation Program
    Beschreibung: Article Nr: e13969
    Schlagwort(e): Biology ; Ecology ; Environment ; Fisheries ; Caribbean Sea ; coral reefs ; bleaching ; climate change ; temperature effects ; CCMI
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-9
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2022-08-08
    Beschreibung: La acumulación de los descartes o conchas de ostiones tiene un impacto ambiental negativo debido a su lenta degradación, y se ha demostrado la potencialidad de estos residuos para la obtención de sales de calcio. En este trabajo se establecieron las mejores condiciones de operación para obtener lactato y citrato de calcio a escala de laboratorio, a partir de la harina de conchas de ostión de mangle mediante lixiviación con HCl, formación de las sales con ácidos orgánicos (láctico y cítrico), utilizando como agente precipitante NaOH. Se evaluó la influencia de cuatro factores: tipo de ácido (láctico y cítrico), concentración de HCl (3,5 % y 7 % v/v), relación solvente: sólido (7:1 y 10:1 mL/g) y velocidad de agitación (150 y 200 min-1) sobre la masa de sal y el rendimiento (referido a la masa de harina, de CaCO3 y la cantidad de sal teórica a obtener), para un diseño experimental 24 con réplica en todos los puntos. El análisis de composición de la harina arrojó el mayor porcentaje para el CaCO3 (89,60 %). El diseño experimental demostró que las únicas variables estadísticamente significativas con 95 % de confianza fueron la concentración de HCl y la relación solvente:sólido para ambas sales. Las mejores condiciones de operación resultaron la concentración de HCl de 7 %, la relación de 10:1 mL/g a 150 min-1.
    Beschreibung: The accumulation of discarded or oyster shells has a negative environmental impact due to its slow degradation, and the potential of these residues to obtain calcium salts has been demonstrated. In this work, the best operating conditions were established to obtain calcium lactate and citrate on a laboratory scale, from mangrove oyster shell meal by leaching with HCl, formation of salts with organic acids (lactic and citric). using NaOH as precipitating agent. The influence of four factors was evaluated: type of acid (lactic and citric), concentration of HCl (3,5 % and 7 % v/v), solvent:solid ratio (7:1 and 10:1 mL/g) and stirring speed (150 and 200 min-1) on the mass of salt and the yield (referred to the mass of flour, of CaCO3 and the amount of theoretical salt to be obtained), for an experimental design 24 with replication at all points . The flour composition analysis showed the highest percentage for CaCO3 (89,60 %). The experimental design showed that the only statistically significant variables with 95 % confidence were the concentration of HCl and the solvent:solid ratio for both salts. The best operating conditions were the HCl concentration of 7 %, the ratio of 10:1 mL/g at 150 min-1.
    Beschreibung: Published
    Beschreibung: Refereed
    Schlagwort(e): Conchas de ostiones ; Lixiviación ; Precipitación ; Sales de calcio ; Oyster shells ; Leaching ; Precipitation ; Calcium salts
    Repository-Name: AquaDocs
    Materialart: Journal Contribution
    Format: pp.7-15
    Standort Signatur Erwartet Verfügbarkeit
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