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  • 1
    Publication Date: 2021-05-19
    Description: Se realizó un estudio de las comunidades de moluscos y foraminíferos bentónicos como posibles productores de bioclastos, en la playa de Varadero y zonas aledañas en abril del 2001. Se inventariaron 106 especies de moluscos y 12 de foraminíferos. La riqueza de especies según el índice de Margalef (5,7 - 9,3) y la densidad (190,9-1228,6 ind.m-2) de moluscos fueron altas, mientras que la biomasa fue baja (0,6 - 66,2 g.m-2), debido al pequeño tamaño que tiene la mayoría de las especies recolectadas. La riqueza de especies de foraminíferos fue baja (0,2-0,8), pero las densidades altas (412,1 -16630,5 NFv.m2). No se observó ninguna tendencia espacial en cuanto a la distribución de ambos grupos en la zona de estudio. Se recomienda un estudio que integre las tasas de sedimentación, origen y la edad de los sedimentos para conocer si la tasa de producción actual de bioclastos en la playa Varadero es suficiente para equilibrar la pérdida de sedimento que se está produciendo.
    Description: A study about mollusk and foraminifera benthonic communities as possible bioclast producers in Varadero beach and surrounding areas was carried out in April 2001. One hundred and six species of mollusks and 12 of foraminifera were inventoried. Mollusk species richness according to Margalef index (5.7 – 9.3) and their density (190.9 – 1228.6 ind.m-2) were high, while their biomass was low (0.6 – 66.2 g.m-2), due to the small size of most collected species. Foraminifera species richness (0.2 – 0.8) was low, but their densities were high (412.1 -16630.5 NFv.m-2). No spatial tendency was found in the distribution of both groups in the study area. A study that integrates sedimentation rates, origin and age of sediments is recommended to determine if current bioclastic production rate in Varadero beach is sufficient to balance the sediment losses that are taking place.
    Description: Published
    Keywords: Moluscos ; foraminíferos ; bioclastos ; playa Varadero ; Matanzas ; Cuba
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 36-48
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  • 2
    Publication Date: 2021-05-19
    Description: La arena de la playa de Varadero está constituida mayormente por macroalgas calcáreas, moluscos y foraminíferos. El objetivo del presente trabajo fue evaluar la abundancia de las macroalgas productoras de bioclastos en los biotopos sublitorales de la zona. Se realizó la identificación específica de las algas, y se estimó su abundancia y contenido de carbonato de calcio. Se encontraron 45 taxones infragenéricos, 31 de las cuales fueron de los órdenes Corallinales, Nemaliales, Siphonocladales, Bryopsidales y Dasycladales. Predominó el género Halimeda, seguido de un césped formado por Jania spp. y Amphiroa spp. Los valores mayores de cobertura, biomasa y contenido de carbonato de calcio en las macroalgas calcáreas estaban en los fondos rocosos con una fina capa de sedimentos, desde la zona central hacia el extremo Norte; mientras que hacia el Sur del Hotel Oasis no se hallaron comunidades significativas. Al Norte de la Península Hicacos se observaron áreas con pastos marinos y una menor cobertura de macroalgas.
    Description: Sands of Varadero beach are constituted by calcareous macroalgae, mollusks and foraminifera. The objective of the present work was to assess the main characteristics of calcareous macroalgae associations in subtidal biotopes of the area. Calcareous algae were identified, and their abundance and calcium carbonate content were estimated. Forty-five infrageneric taxa of macroalgae were found, 31 of them being calcareous algae belonging to the orders Corallinales, Nemaliales, Siphonocladales, Bryopsidales, and Dasycladales. The genus Halimeda dominated, followed by a turf of Jania spp. and Amphiroa spp. Higher values of coverage, biomass and density of calcium carbonate in calcareous macroalgae were found in rocky bottoms with a thin layer of sediments, from the central zone of the peninsula up to the northern end; while no important quantity of calcareous macroalgae was found south of the Oasis Hotel. Northward of Hicacos peninsula, seagrass areas with a lower cover of macroalgae were observed.
    Description: Published
    Keywords: Macroalgas marinas ; carbonato de calcio ; playa Varadero ; Matanzas ; Cuba
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 22-35
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  • 3
    Publication Date: 2020-05-28
    Description: Beach nourishment is generally seen as the preferred means of rectifying coastal erosion, due to its low environmental impact and natural evolution. The largest beach nourishment project ever carried out in Mexico took place on Cancun beach in 2006, as a response to the most intense hurricane season ever registered in Mexico, in 2005. After Hurricane Dean, in 2009, a second nourishment was conducted, which evidenced flaws in the design and execution of the first project. Previous investigations report that the need for beach re-fills directly correlates with wave energy. However, following a thorough revision of the extreme climatic events that occurred between 1978 and 2018, it has been found that the amount of erosion also depends on the frequency and duration of high energy events. The findings also show that the apparent success of the second nourishment is mainly associated with a decline in the number of extreme wave power events impacting the beach. In the conclusion to this paper, we share the knowledge gained, but not yet applied, in Mexico or elsewhere, regarding beach use, urbanization, and protection in beach planning.
    Electronic ISSN: 2077-1312
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
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