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  • 1
    Publication Date: 2021-06-30
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 2
    Publication Date: 2021-06-30
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 3
    Publication Date: 2021-05-19
    Description: Se evaluó el patrón de distribución espacial así como la contribución de las fracciones del plancton a la biomasa planctónica menor de 200 μm en la región NW de las aguas oceánicas adyacentes a Cuba en muestreos realizados en época de invierno (febrero de 1997 y marzo 1999). Los valores de la biomasa bacteriana variaron entre 1.6 y 11.4 mgC m-3, del nanoplancton entre 5.2 y 20.8 mgC m-3 (Xmedia = 11.4 ± 5.4 mgC m-3) y la del microzooplancton entre 4.2 y 15.5 mgC m-3 (Xmedia = 7.9 ± 3.2 mgC m-3). El microfitoplancton presentó valores de biomasa que variaron entre 1.95 y 15.7 mgC m-3 (Xmedia = 8.8 ± 3.7 mgC m-3). Los mayores valores de biomasa de todas las fracciones estudiadas se encontraron en las aguas oceánicas adyacentes a la zona entre las bahías de Mariel y La Habana. El nanoplancton fue la fracción que más aportó a la biomasa menor de 200 μm en la capa fótica, seguida del microzooplancton, tanto en la estación con influencia costera (N.57) como en la oceánica (N.18).
    Description: Published
    Description: Aguas oceánicas, Microzooplancton, Microfitoplancton
    Keywords: Biomass ; Bacteria ; Biomass ; Bacteria ; Nannoplankton ; Oceanic waters ; Zooplankton ; Phytoplankton
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 4
    Publication Date: 2021-05-19
    Description: The anthropogenic affectation was evaluated on the coast N of the Gulf of Batabanó in May 2003 (corresponding to the provinces of Matanzas and Havana), in areas located in the line of the coast. The results were compared with the historical information of the sector. In the coast N and the Ensenada of the Broa, the parameters oxygen saturation, DBO5 and DQO showed characteristic high values of eutrofication. The biggest contribution in the Cianoficies was in the near coastal areas to sources of organic contamination. In the case of the nutrients they show specific data of mesothrofic waters with tendency to the eutrofization and the silts presented a high affectation for toxic metals. The area near to Guanímar is distinguished to present conditions of organic contamination that favor heterothrofic conditions, corroborated by a prevalence of the processes of mineralization of the organic matter over primary production and lows values of fitoplankton concentration. On the contrary, in the region of Surgidero of Batabanó, the processes of synthesis of organic matter prevail suggested by a high primary production, and concentration of fitoplankton, with low breathing levels and mineralization of the organic matter, that indicates that the system is behaving autothrofically. In a general way, this sector is very affected by the anthropogenic impact. The information obtained is of great importance for the development of the fishing and tourist industries in the area.
    Description: Published
    Keywords: Phytoplankton ; Water quality ; Primary production ; Chemistry ; Environmental monitoring ; Phytoplankton ; Water quality ; Primary production ; Chemistry ; Environmental monitoring
    Repository Name: AquaDocs
    Type: Proceedings Paper
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  • 5
    Publication Date: 2021-05-19
    Description: Entre los años 2001 y 2005, fueron evaluados los contenidos de oxígeno disuelto y de materia orgánica en la fase acuosa de las bahías de Cárdenas, Santa Clara, Puerto de Sagua la Grande, San Juan de los Remedios, Buena Vista, Los Perros, Jigüey y La Gloria. En el Puerto de Sagua la Grande y la zona costera de la bahía de Buena Vista se registraron concentraciones de oxígeno disuelto inferiores al valor de saturación en la época de lluvias. Predominaron los montos de materia orgánica expresados en términos de la demanda bioquímica de oxígeno (DBO5) entre 1,0 -2,0 mgO2/L, típicos de agua marina de calidad dudosa para uso pesquero, según la NC-25:99. Las concentraciones más comunes de la demanda química de oxígeno (DQO) al permanganto en medio alcalino fueron superiores a los 2,0 mgO2/L, indicando que existe una tendencia a la contaminación de las agua por materia orgánica. En las bahías de Santa Clara, Los Perros, Jigüey y La Gloria, la materia orgánica es fundamentalmente de origen autóctono. Las restantes bahías son receptoras de cantidades considerables de aguas residuales con escaso o ningún tratamiento, enriqueciendo a las mismas con materia orgánica.
    Description: Between 2001 and 2005, the dissolved oxygen and organic matter contents in the aquous phase were evaluated in the bays of Cárdenas, Santa Clara, Puerto de Sagua la Grande, San Juan de los Remedios, Buena Vista, Los Perros, Jigüey and La Gloria. In Puerto de Sagua la Grande and the coastal zone of Buena Vista Bay, dissolved oxygen concentrations lower than the saturation value were registered in the rainy season. There was a predominance of organic matter quantities expressed in terms of Biochemical Oxigen Demand (BOD5) between 1.0 -2,0 mgO2/L, typical of marine water of doubtful quality for fishing use, according to the NC-25:99. The most common concentrations of the Chemical Oxigen Demand (COD) to permanganate in alkaline medium were higher than 2.0 mgO2/L, indicating that there is a tendency to water pollution by organic matter. In Santa Clara, Los Perros, Jigüey and La Gloria bays, organic matter is fundamentally of autochthonous origin.The remaining bays receive considerable amounts of wastewaters with little or no treatment, that enrich these water bodies with organic matter.
    Description: Published
    Description: Oxígeno, materia orgánica, contaminación, aguas residuales,Oxygen, organic matter, wastewater pollution
    Keywords: Pollution ; Pollution
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 6
    Publication Date: 2021-05-19
    Description: The evaluation of the possible environmental changes due to the anthropic impacts that have happened in the last years in this scenario and the redefinition of areas that suffer affectations were carried up. Any environmental alteration of this ecosystem, either of natural or human origin, can have an important economic and social repercussion. According to the proposed chemical and biological indexes, the waters of the Gulf of Batabanó presented mesotrophic conditions with tendency to the eutrofization in four fundamental areas. In the silts of the Gulf the values of organic carbon and sulphidric acid were characteristic of sediments with high concentrations of organic matter. In the coastal sector N, was determinate high concentrations of sulphidric acid and heavy metals, which indicates elevated levels of antrophic affectation. The waters of the reefs of the Gulf showed mesotrophic conditions, while the silts were considered little affected, according to the chemical and biological indexes proposed in this work.
    Description: Instituto de Oceanología de Cuba
    Keywords: Heavy metals ; Environmental impact ; Water quality ; Coastal waters ; Heavy metals ; Environmental impact ; Coastal waters ; Water quality ; Man-induced effects ; Marine pollution
    Repository Name: AquaDocs
    Type: Conference Material
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  • 7
    Publication Date: 2021-05-19
    Description: El presente estudio de las siguientes especies de microalgas marinas tuvo como objetivo identificar y determinar la actividad antibacteriana de la microbiota presente en los cultivos de las siguientes especies de microalgas marinas: Chaetoceros ceratosporum, Chaetoceros muelleri, Thalassiosira sp., Thalassiosira weisflogii, Amphora sp., Navicula sp. y Tetraselmis suecica, especies que se utilizan en la alimentación de animales acuáticos. Se estudiaron las características morfológicas, culturales y tintoriales de las cepas aisladas, así como las características fisiológicas y bioquímicas. Para la clasificación se utilizó el Manual de Bergey (Krieg & Holt, 1984; Sneath et al., 1986). La actividad antibacteriana se determinó mediante el método de difusión en placa donde se empleó el medio de cultivo agar nutriente y bloques de agar con los cultivos a evaluar. Se aislaron e identificaron 70 bacterias, de las cuales el 25,7 % fueron productoras de sustancias antibacterianas. Las cepas con mayores actividades antibacterianas fueron Bacillus cereus (en cultivos de Thalassiosira sp. y Tetraselmis suecica), y B. megaterium (en cultivos de Chaetoceros ceratosporum) que inhibieron a cuatro de las cepas patógenas ensayadas. Los resultados sugieren que las bacterias aisladas podrían ser aprovechadas como agentes probióticos en el control biológico de patógenos de organismos marinos de interés en maricultivo.
    Description: In this paper, we report the identification and actibacterial activity of marine bacterial strains associated in the marine microalgal cultures Chaetoceros ceratosporum, Chaetoceros muelleri, Thalassiosira sp., Thalassiosira weisflogii, Amphora sp., Navicula sp. and Tetraselmis suecica. The antibacterial activity was determined by the diffusion plate method using Nutrient agar and agar blocks with the cultures to study. As result, 70 marine bacterial strains were isolated and identified, the 25,7 % of the bacterial microbiota was able to produce antibacterial substances. The strains with most antibacterial activity were Bacillus cereus (Thalassiosira sp.), B. cereus (Tetraselmis suecica), and B. megaterium (Chaetoceros ceratosporum) that inhibited four of the pathogens strains assayed. The results suggest that the isolated bacteria could be used as probiotics agents for the biological control of pathogens from marine organisms of interest in mariculture.
    Description: Published
    Description: antibacterial activity
    Keywords: Check lists ; Isolation (genetics) ; Algae culture
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 8
    Publication Date: 2021-05-19
    Description: Se realizó la evaluación de los posibles cambios ambientales debido a los impactos antrópicos que han ocurrido en los últimos años en este escenario y la redefinición de áreas que sufren afectaciones, teniendo en cuenta que cualquier alteración ambiental de este ecosistema, ya sea de origen natural o humano, puede tener una importante repercusión económica y social. A partir de los índices químicos y biológicos propuestos, las aguas del Golfo de Batabanó presentaron condiciones mesotróficas con tendencia a la eutrofización en cuatro áreas fundamentales. En los sedimentos del Golfo los valores de carbono orgánico (0.16-7.30 %) y sulfhídrico (12,19-22,90 μg/L) fueron característicos de fondos con altas concentraciones de materia orgánica. En el sector costero N, se encontraron contenidos elevados de sulfhídrico y metales pesados, lo cual indica altos niveles de afectación antrópica. Las aguas de los arrecifes del Golfo mostraron condiciones mesotróficas, mientras que los sedimentos se consideraron poco afectados, según los índices de estado trófico químicos y biológicos propuestos en este trabajo.
    Description: The assessment of the possible environmental changes due to the anthropogenic impacts that have occurred in the last years in this scenario, and the redefinition of areas that suffer affectations were carried up. Any environmental alteration of this ecosystem, either of natural or human origin, can have an important economic and social repercussion. According to the proposed chemical and biological indexes, the waters of the Gulf of Batabanó presented mesotrophic conditions with tendency to the eutrofization in four fundamental areas. In the sediments of the Gulf, the values of organic carbon (0.16-7.30 %) and sulphidric acid were characteristic of sediments with high concentrations of organic matter (12,19-22,90 μg/L). In the N coastal sector, high concentrations of sulphidric acid and heavy metals were determined, which indicates increased levels of anthropogenic impact. Reef waters in the Gulf showed mesotrophic conditions, while the sediments were considered as little affected, according to the chemical and biological indexes proposed in this work.
    Description: Published
    Description: impacto antrópico, eutrofización, fitoplancton, tasa de mineralización, materia orgánica, sedimentos, metales pesados, índices de calidad, anthropogenic impact, eutrofization, rate of mineralization, organicmatter, sediments,quality indexes.
    Keywords: Phytoplankton ; Heavy metals ; Phytoplankton ; Sediments ; Heavy metals
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 9
    Publication Date: 2021-05-19
    Description: Se construyeron y modelaron los resupuestos y procesos biogeoquímicos de carbón, nitrógeno y fósforo para tres muestreos (Julio/2004, Abril y Diciembre/2005) en un cuerpo de agua de semi-cerrado e hipersalino como la Bahía de Jigüey. Se colectaron muestras de agua para medir los parámetros hidroquímico s relacionados con el sistema, nutrientes inorgánicos (nitratos + nitrito, amonio y fósforo), la demanda química de oxígeno, nitrógeno total y fósforo total. En la etapa de la investigación la salinidad varió entre 50 y 95 ups y se calcularon los presupuestos de carbón y nutrientes por muestreo. El flujo de fósforo inorgánico (ΔIP) en la bahía está alrededor de -2,06 mmol m-2 d-1, y equivale a una producción promedio de carbón orgánico por vía fotosintética de 2,31 x102 mmol C m-2 d-1. A lo largo del período de estudio, la fijación de nitrógeno, supera a la desnitrificación (Nfij-desnit), alcanzando un valor promedio de 4,73 x 102 mmol m-2 N d-1.
    Description: Biogeochemical processes and budgets of carbon, nitrogen and phosphorus in the semienclosed water body Jigüey Bay during three samplings (July/2004, April and December/2005) were constructed and modeled. This is a hypersaline water body; its salinity oscillates between 50 and 95 spu. Samples were collected for the period of the investigation, and hydrochemical properties, inorganic nutrients (Nitrates + nitrite, ammonium and phosphorus), chemical oxygen demand, total nitrogen and total phosphorus from waters associated with the system were measured. Thus, carbon and nutrient budgets were prepared for each sampling. The flux of inorganic phosphorus (ΔIP) from the bay is around -2,06 mmol m-2 d-1, that is equivalent to an internal organic carbon of 2,31 x102 mmol C m-2 d-1. Nitrogen fixation, exceeds denitrification throughout the period of observation (Nfix-denit) = 4,73 x 102 mmole N m-2 d-1.
    Description: Published
    Description: Fluxes, budgets, LOICZ
    Keywords: Nutrients (mineral) ; Organic carbon
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 10
    Publication Date: 2021-05-19
    Description: El Archipiélago Sabana – Camagüey es una de las regiones más estudiadas de la plataforma marina cubana. Entre los años 2001-2005 se evaluaron los contenidos de nitratos más nitrito, amonio, nitrógeno total, fósforo inorgánico y fósforo total, y se establecieron las relaciones nitrógeno total inorgánico & fósforo inorgánico N/P y nitrógeno total & fósforo total NT/PT, en las bahías de Cárdenas, Santa Clara Oeste, Puerto de Sagua la Grande, San Juan de los Remedios, Buenavista, Los Perros, Jigüey y La Gloria. El amonio fue la principal fuente de nitrógeno inorgánico y los contenidos de nitrógeno orgánico evidenciaron el predominio de los procesos de biosíntesis. Las relaciones N/P y NT/PT fueron superiores a 16:1 en la mayoría de las bahías estudiadas, indicando que el fósforo fue restrictivo para los productores primarios excepto en la bahía de San Juan de los Remedios.
    Description: The Sabana – Camagüey Archipelago is one of the studied regions more of the Cuban marine shelf. the bays Cárdenas, Santa Clara Oeste, Puerto de Sagua la Grande, San Juan de los Remedios, Buenavista, Los Perros, Jigüey and La Gloria were evaluated between years 2001 and 2005 the contents of nitrate more nitrito, ammonium, total nitrogen, inorganic phosphorus and total phosphorus and established the rates inorganic total nitrogen & inorganic phosphorus N/P and total nitrogen & total phosphorus NT/PT. The most important source inorganic nitrogen was the ammonium and the organic nitrogen contents confirmed the predominance of the biosynthesis processes. In the majority of the studied bays the rates N/P and NT/PT were higher than 16:1, the primary producers were limiting for phosphorus except in San Juan de los Remedios bay.
    Description: amonio, nitrógeno, fósforo y bahías.
    Keywords: Nitrogen ; Phosphorus ; Ammonium compounds ; Ammonium compounds ; Nitrogen ; Phosphorus ; Bays
    Repository Name: AquaDocs
    Type: Preprint
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