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| Registros recuperados: 364 | |
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| Armenteros Almanza, M.. |
| Present thesis focuses on ecology of assemblages and taxonomy of free-living marine nematodes. Most of the data are from Cienfuegos, a semi-enclosed bay in the Caribbean Sea; but, we also provided data on biodiversity from other areas in Cuban marine waters. Four main topics are included: description of biodiversity patterns, a microcosm experiment about effects of organic enrichment on assemblages, a taxonomic revision of the genus Terschellingia de Man, 1888, and the description of four new genera for science. |
| Tipo: Theses and Dissertations |
Palavras-chave: Ecology; Taxonomy; Marine water; Biodiversity; Sea state. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5386 |
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| González Díaz, S. P.. |
| En las últimas décadas ha ocurrido un deterioro acelerado de los arrecifes de coral debido al efecto sinérgico de impactos naturales y antrópicos. En consecuencia, el objetivo de la tesis es evaluar los efectos acumulativos producidos por agentes estresantes múltiples y que impactan de forma simultánea los corales hermatípicos. Para ello se estimaron indicadores ecológicos en los niveles de comunidad y población. Los resultados obtenidos en esta investigación evidencian cambios en la estructura de las comunidades de corales que se asocian con el impacto antrópico directo existente a lo largo de la costa noroccidental de Cuba y que disminuye en la dirección este-oeste. Los indicadores ecológicos referidos a las tallas de los corales, muestran... |
| Tipo: Theses and Dissertations |
Palavras-chave: Coral reefs; Agents; Sedimentation; Eutrophication. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5385 |
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| Comabella Soto, Y.; Centro de Investigaciones Marinas Universidad de La Habana. |
| En el presente estudio se evalúa el efecto que la levadura Saccharomyces cerevisiae de forma desintegrada (LD) y tres fracciones obtenidas de ella (complejo pared-membrana (FP), núcleo- proteínas (FN) y citoplasma (FC)) produce en dos modelos biológicos experimentales: la línea celular MB16-F10 y la especie Artemia franciscana. Para los estudios celulares se empleó la parte soluble de cada una de estas fracciones probándose las concentraciones de 0.5, 1, 2, 5 y 10 µg/mL adicionándose el valor de 25 µg/mL para LD y FC. Se determinó el efecto en la proliferación, vitalidad y fases del ciclo celular a las 48 y 72 horas. Como resultado se obtuvo una acción estimulante de la proliferación celular con LD 5 µg/mL a las 48 horas y con FN 0.5 y 1 µg/mL a... |
| Tipo: Theses and Dissertations |
Palavras-chave: Molecular biology; Cell biology. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/5666 |
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| Hernando, M.P.. |
| The increments in the ultraviolet radiation B (RUVB, 280-320 nm) resultants of the destruction of the ozone layer affect diverse echo-physiologic aspects of the marine phytoplankton. On this study were compared the responses of phytoplankton from an ambient Sub-Antarctic (Channel Beagle, 54º 52´S, 68º 18´W) and another Antarctic (Potter Cove, 62º 14´S, 58º 38´W) to the ultraviolet radiation (RUV). The decrease of the photosynthesis on short term (hours) was observed in both places, however inhibition thresholds were present. In the Beagle Channel, these were for RUVB and ultraviolet radiation A (RUVA, 320-400 nm), respectively, 0,2 and 6,2 Wm-2 for communities with more than 70% diatoms and 0,45 and 14,2 Wm-2, respectively, for communities with more than... |
| Tipo: Theses and Dissertations |
Palavras-chave: Phytoplankton; Photosynthesis; Ultraviolet radiation; Vertical mixing; Taxonomy; Phytoplankton; Taxonomy; Photosynthesis; Ultraviolet radiation; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_7631; Http://aims.fao.org/aos/agrovoc/c_5812; Http://aims.fao.org/aos/agrovoc/c_8046. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/2868 |
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| Angulo-Valdés, J. A.. |
| In this work the management effectiveness of a Cuban MPA is assessed using an interdisciplinary approach. A series of three hypotheses are tested to determine how effective the Punta Frances Marine Protected Area (PFMPA) has been in meeting the multiple objectives of conserving biological diversity and ecological integrity, while allowing for the development of economic opportunities for tourism, and satisfying the needs of local and distant human populations. A new typology of benefits derived from MPAs was produced to provide managers with a practical tool that enable them to: 1) identify the benefits at the early stages of MPA creation, 2) state MPA objectives in a clear and measurable way, 3) assess the effectiveness of their MPA in meeting... |
| Tipo: Theses and Dissertations |
Palavras-chave: Protected areas; Methodology; Abundance. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/5483 |
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| Pájaro, M.. |
| Cannibalism is not an abnormal behaviour and it can be observed in a wide number of animals. In Pisces, cannibalism may be the result of endogenous intraspecific factors (nutritional state, size, age, state of development) or exogenous intraspecific factors (food, density, light). Nevertheless, external fertilization and the high fecundity of teleost fish tend to increase egg cannibalism, in particular among filter feeding fishes such as anchovies. In the present work, two important Argentine anchovy Engraulis anchoita stocks were studied. The first is to the north of 41°S, and spawns during spring on the coastal and shelf waters of Buenos Aires Province,Argentina, and Uruguay. The second one inhabits the Patagonian region, from 41°S to 47°S. It spawns... |
| Tipo: Theses and Dissertations |
Palavras-chave: Feeding behaviour; Cannibalism; Natural mortality; Fish larvae; Fish eggs; Spawning seasons; Stocks; Food preferences; Reproduction; Stocks; Food preferences; Feeding behaviour; Cannibalism; Fish larvae; Reproduction; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_3024; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_9580; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_6507. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/1476 |
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| Registros recuperados: 364 | |
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