http://hdl.handle.net/1834/1916 2013-05-24T01:04:19Z 2013-05-24T01:04:19Z Cabrera, R. Alfonso, Y. Martínez-Daranas, B. Suárez, A. M. http://hdl.handle.net/1834/4342 2012-08-16T14:26:37Z 2012-01-01T00:00:00Z

Title: Estructuras reproductoras y epífitas del género Avrainvillea en aguas cubanas Authors: Cabrera, R.; Alfonso, Y.; Martínez-Daranas, B.; Suárez, A. M. Abstract: Se describen las estructuras reproductivas en Avrainvillea elliottii A. Gepp et E. S. Gepp, A. longicaulis f. laxa D. S. Littler et M. M. Littler y A. digitata Littler et Littler para aguas cubanas. Se revisaron materiales de herbario del género Avrainvillea, así como ejemplares de reciente colecta y se registraron un total de 41 táxones, 23 Rhodopyta, 4 Ochrophyta y 14 Chlorophyta como epífitas. A. levis Howe presentó como epífitas a miembros de su misma especie, tanto en la lámina como en la porción apical del estipe. Los rizoides pegados a los talos epifitos de A. levis tiene forma de disco. El estipe fue la región del talo que presentó el mayor número de especies epífitas. Se adicionan siete especies de algas marinas a la flora ficológica de Cuba: Rhodogorgon ramosissima N. Norris et Bucher, Botryocladia spinulifera W. R. Taylor et I. A. Abbott, Ceratodictyon scoparium (Mont. et Millardet) R.E. Norris, Ulva rigida C. Agardh, Caulerpa prolifera f. obovata (J. Agardh) Weber Bosse, H. monile f. robusta (Børgesen) Collins et Herv., y Udotea cyathiformis var. cyathiformis f. infundibulum (J. Agardh) D. S. Littler et M.M. Littler.Details of reproductive structures in Avrainvillea elliottii A. Gepp et E. S. Gepp, A. longicaulis f. laxa D. S. Littler et M. M. Littler and A. digitata Littler et Little rare described for first time in Cuban water. Plentiful herbarium samples of Avrainvillea and recently collected material are checked. 41 Epiphyte taxa were recorded: 23 Rhodopyta, 4 Ochrophyta and 14 Chlorophyta. Avrainvillea levis Howe evidenced had growing on its blades or the ends of its stipes specimens of its own specie. Rhizoid the attachment structure in the epiphyte thallus of A.levis has the shape of a disc. The stipe showed the largest number of epiphyt species. Seven marine algae species: Rhodogorgon ramosissima N. Norris et Bucher, Botryocladia spinulifera W. R. Taylor et I. A. Abbott, Ceratodictyon scoparium (Mont. et Millardet) R.E. Norris, Ulva rigida C. Agardh, Caulerpa prolifera f. obovata (J. Agardh) Weber Bosse, H. monile f. robusta (Børgesen) Collins et Herv., and Udotea cyathiformis var. cyathiformis f. infundibulum (J. Agardh) D.S Littler et M.M Littler, are added to the flora of Cuba.

2012-01-01T00:00:00Z Alcolado Prieto, P. Caballero Aragón, H. Alcolado, P. M. Lopeztegui Castillo, A. http://hdl.handle.net/1834/4457 2012-10-24T17:49:44Z 2012-01-01T00:00:00Z

Title: Reclutamiento de corales pétreos en arrecifes coralinos a diferentes distancias de fuentes de contaminación en La Habana, Cuba Authors: Alcolado Prieto, P.; Caballero Aragón, H.; Alcolado, P. M.; Lopeztegui Castillo, A. Abstract: The effect of pollution on coral recruitment has been insufficiently studied. This research deals with coral recruitment in coastal areas and aimed to determine the variations of density and dominant species of corals recruits in sites at different distances from pollution sources. The composition and structure of stony coral (scleractinian and milleporids) recruit associations were characterized in the fringing reef of Western Havana, Cuba. This reef is influenced by urban pollution from the Almendares River and a sewage outlet located at its mouth. Four sites were sampled on the upper fore reef escarpment at 10m deep every three months between July 2007 and May 2008. A 25cm side quadrat was used to determine the density and taxonomic composition of recruits smaller than 3cm in diameter. Sampling units were placed following a random-systematic pattern. The mean density of recruits was determined both at assemble and species level. Bifactoral ANOVA tests were applied to compare mean densities at both sampling sites and dates. Student-Newman-Keuls test was applied to compare pairs of means. Cluster and nMDS analyses were applied to evaluate between site similarities. The predominant species was Siderastrea siderea followed by S. radians and Porites astreoides. Recruit densities were similar among La Puntilla, Calle 16 and Acuario sites. Lower densities were always found in Malecón. Significant differences in mean stony recruit densities were found both between sites and sampling dates. The statistic analysis did not show significant spatial-temporal interactions. Malecón, the most polluted site, showed the lowest recruit density and the greater presence of species considered as indicators of organic pollution, sedimentation and abrasion. The density of recruit species was higher in October 2007 and lower in May 2008, and it was apparently influenced by reproduction and cold front seasons, respectively. The higher dominance and abundance of S. siderea, S. radians and P. astreoides recruits were apparently due to their high reproductive potential and resistance to disturbances. The identity of dominant species was apparently related to distance from major pollution sources. We highly recommended the replication of this research in other areas of the greater Caribbean region to test the generality of present results and to compare among areas. Future research should take into account the influence of other environmental factors, along with an appraisal of recruit species tolerance to these factors, to better ponder the effect of urban pollution on recruitment. Areas with well assessed pollution regimes are recommended for research.

2012-01-01T00:00:00Z García Parra, M. Monzote Fidalgo, C.L. Castañeda Pasarón, C.O. García Delgado, N. Pérez Hernández, A. http://hdl.handle.net/1834/4508 2012-11-20T13:32:07Z 2012-01-01T00:00:00Z

Title: Actividad antileishmanial de seis extractos de organismos marinos Authors: García Parra, M.; Monzote Fidalgo, C.L.; Castañeda Pasarón, C.O.; García Delgado, N.; Pérez Hernández, A. Abstract: Introducción: las infecciones causadas por protozoos del género Leishmania constituyen un problema de salud mundial con una alta prevalencia en países subdesarrollados. En la actualidad no existe una vacuna contra esta enfermedad y el tratamiento utilizado es deficiente, por lo que la búsqueda de medicamentos más efectivos y seguros constituye una urgente necesidad. Objetivo: evaluar la actividad antileishmanial in vitro de 6 extractos acuosos e hidroalcohólicos de organismos marinos. Métodos: se determinó la actividad frente a promastigotes y amastigotes de Leishmania amazonensis, así como su toxicidad frente a macrófagos peritoneales de ratones BALB/c. Resultados: en el ensayo de promastigotes los extractos de Bryothamnion triquetrum, Bunodosoma granulifera, Halimeda opuntia, y Physalia physalis mostraron una inhibición del crecimiento a concentraciones menores de 100 μg/mL; mientras que frente a amastigotes, estos 2 últimos extractos fueron los más activos y menos tóxicos con un índice de selectividad de 6 y 8, respectivamente. Conclusiones: teniendo en cuenta estos resultados se consideró que los extractos de H. opuntia y P. physalis mostraron una promisoria actividad, por lo que se sugiere continuar los estudios de su actividad in vivo

2012-01-01T00:00:00Z Varela, C. http://hdl.handle.net/1834/4712 2013-03-20T19:04:31Z 2012-01-01T00:00:00Z

Title: Una especie nueva de la familia Artotrogidae (Copepoda : Siphonostomatoida ) de Cuba. Authors: Varela, C. Abstract: A new species of copepod belonging to the genus Bradypontius Giesbrecht, 1895, collected in the South Central region of Cuba is described. This is the first record of the family Artotrogidae Brady, 1880, for the Caribbean Sea.; Se describe una especie nueva de copépodo perteneciente al género Bradypontius Giesbrecht, 1895, hallado en la región Sur Central de Cuba. Esta es la primera ocasión en que se registra un representante de la familia Artotrogidae Brady, 1880, para el Mar Caribe.

2012-01-01T00:00:00Z