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  • Condensed Matter: Electronic Properties, etc.  (3)
  • Áreas Marinas Protegidas  (2)
  • 2015-2019  (5)
  • 1935-1939
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  • 1
    Publication Date: 2021-05-19
    Description: El objetivo de la investigación fue evaluar el estado de salud de los arrecifes de coral en un sector del Parque Nacional Jardines de la Reina (PNJR) y del golfo de Ana María (GAM). Para ello se establecieron cuatro estaciones dentro del PNJR y dos en GAM en febrero del año 2015. Los biotopos seleccionados fueron veril y cabezos. Los indicadores ecológicos seleccionados para evaluar la salud del arrecife fueron: salud de corales, densidad de corales y de las especies más abundantes, cubrimiento de corales, algas y esponjas. Para evaluar la salud y la densidad de los corales se empleó el método transepto de banda de 10 m de largo por 1 m de ancho, y para el cubrimiento se utilizó el transepto de 10 m lineales. Se colocaron 10 unidades de muestreo por estación. La salud de los corales se afectó fundamentalmente por el blanqueamiento (17,7% de colonias blanqueadas). Las especies más sensibles al mismo fueron Siderastrea siderea (Ellis y Solander, 1786) y Agaricia agaricites (Linnaeus, 1758). La enfermedad mancha amarilla afectó a la especie Orbicella annularis (Ellis y Solander, 1786). La mortalidad antigua afectó mayormente a las especies O. annularis y Orbicella faveolata (Ellis y Solander, 1786). La densidad de corales varió entre 35,2 colonias/10 m2 y 92,2 colonias/10 m2. Porites astreoides (Lamarck, 1816) fue la especie con densidad superior. El cubrimiento de coral varió entre 9% y 55%. Los resultados permiten concluir que aunque los arrecifes evaluados no son invulnerables a los impactos globales, los indicadores ecológicos relacionados con la salud, la densidad y el cubrimiento de corales muestra resultados más favorables que los obtenidos para otros arrecifes de Cuba y el Caribe.
    Description: The research goal was to evaluate the health reef in a sector of the National Park Jardines de la Reina (PNJR) and the Golfo de Ana María (GAM). Four stations were established in to the PNJR and two in GAM on February of 2015. The selected biotopes were terrace border and coral patch. The selected ecologic indicators to evaluate the reef’s health were: coral health, coral density and the most abundant species, as well as coral, algal and sponge cover. To evaluate the health and density was used the belt transect method with 10 m long for 1 m of wide, and for the cover it was used the 10 m long lineal transect. Ten sample units for stations were placed. Coral health was affected mainly by bleaching (17.7% of bleached colonies). The most affected due to the blanching were Siderastrea sidereal (Ellis y Solander, 1786) y Agaricia agaricites (Linnaeus, 1758). Yellow blotch disease affected to Orbicella annularis (Ellis y Solander, 1786). Old mortality mainly affected to O. annularis y O. faveolata (Ellis y Solander, 1786). Coral density varied between 35.2 colonies/10 m2 and 92.2 colonies/ 10 m2. Porites astreoides (Lamarck, 1816) was the specie that showed highest density. Live coral cover varied between 9% and 55%. The results permit conclude that even though the Marine Protected Areas aren’t invulnerable to global impacts, the ecological indicators evaluated and related with health, density and coral cover shows better results than for others Cuban and Caribbean reefs.
    Description: Published
    Keywords: Marine Protected Areas ; Bleaching ; Corals ; Jardines de la Reina Archipelago ; Corals and reefs health ; Áreas Marinas Protegidas ; Blanqueamiento ; Corales ; Archipiélago Jardines de la Reina ; Salud de corales y arrecifes
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 34-53
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  • 2
    Publication Date: 2021-05-19
    Description: El objetivo de la investigación fue evaluar las comunidades de corales en sitios de buceo del Parque Nacional Marino Punta Francés. En noviembre de 2014 se establecieron cinco estaciones en el biotopo veril. Los indicadores ecológicos evaluados a nivel de comunidad fueron: diversidad de corales, composición por especies de corales, densidad de corales, esponjas y gorgonias, y cobertura del sustrato por corales, algas y esponjas. A las especies más abundantes de corales se les evaluó la salud. Para evaluar la diversidad y densidad, se empleó el método de conteo de colonias con marco de 1m2. La cobertura del sustrato se evaluó mediante el método de transepto lineal. Los índices de diversidad fueron superiores a otros estudios en este mismo arrecife. La densidad de corales (15,5 col/m2) y gorgonias (7,9 col/m2) fue elevada. La cobertura de coral vivo fue inferior al 15% mientras las algas cubrieron el 83% del sustrato. En relación a la salud, la especie más afectada por blanqueamiento, mortalidad antigua y bioerosión fue Siderastrea siderea. El 15 % de las colonias evaluadas presento mortalidad antigua. El análisis integral de los indicadores ecológicos evaluados, evidencia que el arrecife se encuentra en un estado de salud favorable y que conserva mecanismos de resiliencia aun cuando están teniendo lugar procesos negativos como los relacionados con la cobertura del sustrato. En dicho arrecife, no se encontraron evidencias de impactos relacionados con la actividad del buceo.
    Description: The research goal was to evaluate coral communities in the Punta Frances National Marine Park's dive sites. We surveyed five stations located at the terrace edge of this reef in November, 2014. Corals diversity, species composition, density of corals, sponges and gorgonians and substrate cover by corals, algae and sponges were the ecological indicators evaluated. Health condition was also evaluated but only in the dominant species. We assessed diversity and density by counting the number of colonies per square meter. Substrate cover was evaluated using linear transect method. Diversity indexes were higher regarding others surveys in the same reef. Coral (15,5 col/m2) and gorgonians (7,9 col/m2) densities were as well higher when comparing with other studies. Coral cover was less than 15% and algae covered the 83% of the substrate. Siderastrea siderea was the species more affected by bleaching, ancient mortality and bioerosion. Fifteen percent of the evaluated colonies had ancient mortality. The comprehensive analyzes of the ecological indicators evaluated show evidences of a favorable health state and preservation of resilience mechanisms even when some negative processes are taking place, such as those related with substrate cover. We didn't find evidences of negative impact related with diving activities in this reef.
    Description: Published
    Keywords: Marine protected areas ; Algae ; Bleaching ; Corals ; PNMPF ; Áreas Marinas Protegidas ; Algas ; Blanqueamiento ; Corales ; PNMPF
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp.19-39
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  • 3
    Publication Date: 2015-02-14
    Description: Author(s): L. Rettig, S. O. Mariager, A. Ferrer, S. Grübel, J. A. Johnson, J. Rittmann, T. Wolf, S. L. Johnson, G. Ingold, P. Beaud, and U. Staub Using femtosecond time-resolved x-ray diffraction we investigate the structural dynamics of the coherently excited A 1g phonon mode in the Fe-pnictide parent compound BaFe 2 As 2 . The fluence dependent intensity oscillations of two specific Bragg reflections with distinctly different sensitivity to the ... [Phys. Rev. Lett. 114, 067402] Published Fri Feb 13, 2015
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 4
    Publication Date: 2017-06-17
    Description: Author(s): C. Laulhé, T. Huber, G. Lantz, A. Ferrer, S. O. Mariager, S. Grübel, J. Rittmann, J. A. Johnson, V. Esposito, A. Lübcke, L. Huber, M. Kubli, M. Savoini, V. L. R. Jacques, L. Cario, B. Corraze, E. Janod, G. Ingold, P. Beaud, S. L. Johnson, and S. Ravy Femtosecond time-resolved x-ray diffraction is used to study a photoinduced phase transition between two charge density wave (CDW) states in 1 T − TaS 2 , namely the nearly commensurate (NC) and the incommensurate (I) CDW states. Structural modulations associated with the NC-CDW order are found to disapp… [Phys. Rev. Lett. 118, 247401] Published Fri Jun 16, 2017
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 5
    Publication Date: 2016-12-10
    Description: Author(s): Mehrshad Mehboudi, Benjamin M. Fregoso, Yurong Yang, Wenjuan Zhu, Arend van der Zande, Jaime Ferrer, L. Bellaiche, Pradeep Kumar, and Salvador Barraza-Lopez GeSe and SnSe monochalcogenide monolayers and bilayers undergo a two-dimensional phase transition from a rectangular unit cell to a square unit cell at a critical temperature T c well below the melting point. Its consequences on material properties are studied within the framework of Car-Parrinello m… [Phys. Rev. Lett. 117, 246802] Published Fri Dec 09, 2016
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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