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Search Results: 1 - 10 of 1516 matches for " Segura-Puertas "
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Further observations on the strobilation of the coronate scyphozoan Linuche unguiculata (thimble jellyfish)
Segura-Puertas, Lourdes;Ordu?a-Novoa, Karina;Heimer de la Cotera, Edgar;
Hidrobiológica , 2008,
Abstract: in nature, strobilation of linuche unguiculata is triggered by an increase in water temperature. however, the results showed that under laboratory conditions, it can be induced when scyphistomae are submitted to a sudden drop of 5 °c.
Further observations on the strobilation of the coronate scyphozoan Linuche unguiculata (thimble jellyfish) Observaciones adicionales sobre la estrobilación del escifozoario coronate Linuche unguiculata (medusa dedal)
Lourdes Segura-Puertas,Karina Ordu?a-Novoa,Edgar Heimer de la Cotera
Hidrobiológica , 2008,
Abstract: In nature, strobilation of Linuche unguiculata is triggered by an increase in water temperature. However, the results showed that under laboratory conditions, it can be induced when scyphistomae are submitted to a sudden drop of 5 °C. En condiciones naturales, la estrobilación de Linuche unguiculata es desencadenada por un incremento en la temperatura del agua. Sin embargo, los resultados mostraron que en condiciones de laboratorio, este proceso puede ser inducido al someter a los escifistomas a un descenso brusco de la temperatura de 5 °C.
Medusas (Cnidaria: Hydrozoa) de una zona de afloramiento costero, Bahía Culebra, Pacífico, Costa Rica Medusae (Cnidaria: Hydrozoa) from a coastal upwelling zone, Culebra Bay, Pacific, Costa Rica
Karina Rodríguez-Sáenz,José A. Vargas-Zamora,Lourdes Segura-Puertas
Revista de Biología Tropical , 2012,
Abstract: Las hidromedusas tienen un papel importante en redes tróficas marinas debido a sus hábitos alimenticios depredadores. Este es el primer estudio de este grupo del zooplancton gelatinoso en un area de afloramiento costero en América Central. Durante seis meses de 1999, se estudió la abundancia de hidromedusas en cuatro estaciones en Bahía Culebra, Golfo de Papagayo, costa Pacífica de Costa Rica (10o 37’N-85o40’W). Se identificó un total de 53 especies de las que 26 son registros nuevos para Costa Rica, 21 son registros nuevos para América Central y 8 son nuevos registros para el Pacífico Oriental Tropical. Las especies más abundantes durante el estudio (con más de 30% de la abundancia total) fueron Liriope tetraphylla, Solmundella bitentaculata y Aglaura hemistoma. Seis especies se presentaron en todos los muestreos, 10 especies se presentaron únicamente durante la época seca y 17 se presentaron únicamente durante la época lluviosa. Se mostraron diferencias significativas entre las épocas lluviosa y seca. La máxima abundancia promedio de hidromedusas (2.1±4.3 ind./m3) fue encontrada durante las fechas que se espera el afloramiento costero, indicado por alta concentración de oxígeno y baja temperatura. La rica composición de especies encontrada en Bahía Culebra puede ser el resultado de varios factores, incluyendo la condición prístina de la bahía, el transporte de especies por la Contra Corriente Nor-Ecuatorial (NECC) y los aportes de origen terrestre. Se incluyen ilustraciones de las 15 especies más importantes para facilitar su identificación y promover estudios futuros en la región. The hydromedusae have an important role in marine trophic webs due to their predatory feeding habits. This is the first study of this group of gelatinous marine zooplankton in a coastal upwelling area of Central America. The composition and abundance variability of hydromedusae were studied during six months in 1999 at four stations in Culebra Bay, Gulf of Papagayo, Pacific coast of Costa Rica (10o37’ N-85o40’ W). A total of 53 species were identified, of which 26 are new records for Costa Rica, 21 are new records for Central America, and eight are new records for the Eastern Tropical Pacific. The more abundant species (more than 30% of the total abundance) were Liriope tetraphylla, Solmundella bitentaculata and Aglaura hemistoma. Six species occurred throughout the sampling period, 10 were present only during the dry season (December-April), and 17 were so during the rainy season (May-November). Significant differences of medusan abundances were found between seasons (dry
Summer composition and distribution of the jellyfish (Cnidaria: Medusozoa) in the shelf area off the central Mexican Pacific Composición y distribución de las medusas (Cnidaria: Medusozoa) en la plataforma continental central del Pacifico mexicano
Lourdes Segura-Puertas,Carmen Franco-Gordo,Eduardo Suárez-Morales,Rebeca Gasca
Revista mexicana de biodiversidad , 2010,
Abstract: The composition, distribution, and abundance of the jellyfish community of a shelf area of the Mexican tropical Pacific were surveyed during August 1988. Zooplankton samples were collected along transects on the outer and inner sectors of the continental shelf to determine the structure of the jellyfish community and its variation in this area during the rainy season. A total of 23 species were recorded, with Aglaura hemistoma, Solmundella bitentaculata, Liriope tetraphylla, Pelagia noctiluca, and Rhopalonema velatum being the most abundant. The total abundance of medusae and of the most abundant species was statistically independent of depth and distance to the coast. Hence, the total jellyfish abundance of the most abundant species, and Shannon's Diversity index had a uniform distribution in both the inner and the outer shelf; furthermore, neritic-oceanic forms and oceanic species occurred indistinctly over the entire continental shelf. On the outer shelf A. hemistoma and S. bitentaculata were most abundant; the former species, together with L. tetraphylla, weakly characterized the inner shelf jellyfish community. The narrowness of the shelf, the wide distribution of the most abundant forms, and the possible effect of local advective processes from the oceanic zone masked a definite gradient across the shelf. Three species have not been recorded previously in the Mexican Pacific: Amphinema dinema (Péron and Lesueur, 1810), Sarsia coccometra Bigelow, 1909, and Clytia mccradyi (Brooks, 1888). The finding of A. dinema is the first in the Eastern Pacific. Se estudió la composición, distribución y abundancia de la comunidad de medusas de la plataforma continental en el Pacífico mexicano durante agosto 1988. Las muestras de zooplancton provienen de transectos en las zonas externa e interna de la plataforma para determinar la estructura de la comunidad de medusas y su variación durante la época de lluvias. Se identificaron 23 especies; las más abundantes fueron Aglaura hemistoma, Solmundella bitentaculata, Liriope tetraphylla, Pelagia noctiluca y Rhopalonema velatum. La abundancia total de las medusas y la de las especies más abundantes fue estadísticamente independiente de la profundidad y de la distancia a la costa. Por tanto, la abundancia total de las medusas, la de las especies más abundantes y la diversidad de Shannon tuvieron una distribución uniforme en ambas zonas, interna y externa de la plataforma. Adicionalmente, las formas nerítico-oceánicas y las plenamente oceánicas se presentaron de manera indistinta a través de la plataforma. En la parte ext
Primer registro de Phialella quadrata y ampliación del límite de distribución de ocho especies de hidromedusas (Hydrozoa) en el Océano Atlántico Occidental
Mendoza-Becerril, María de los Angeles;Oca?a-Luna, Alberto;Sánchez-Ramírez, Marina;Segura-Puertas, Lourdes;
Hidrobiológica , 2009,
Abstract: the new records provided here extend the geographic distribution know of nine hydromedusae species collected in the laguna madre, tamaulipas, mexico. the record of phialella quadrata is the first one for the western atlantic ocean, while ectopleura dumortieri is registered for the first time in the gulf of mexico and clytia folleata in the north of the same gulf. the geographic distribution of bougainvillia superciliaris, nemopsis bachei, sarsia tubulosa and clytia globosa is extended to a lower latitude, while eirene tenuis and octophialucium medium increase to a higher latitude.
Some toxinological aspects of Aurelia aurita (Linné) from the Mexican Caribbean
Segura-Puertas, L.;Avila-Soria, G.;Sánchez-Rodríguez, J.;Ramos-Aguilar, M. E.;Burnett, J. W.;
Journal of Venomous Animals and Toxins , 2002, DOI: 10.1590/S0104-79302002000200007
Abstract: aurelia aurita is a scyphozoan, abundant in the mexican caribbean during summer. although usually innocuous, there is evidence of it causing harm to humans. this work investigates the biological activities of crude and fractionated extracts of a. aurita. live specimens were collected between july and september 1999 from the mexican caribbean. the tentacular margin was dissected immediately and frozen at -50oc. a nematocyst suspension was prepared, discharged, and the supernatants lyophilized. hemolytic assay was performed with lyophilized crude extract on bovine, sheep, and human red blood cells. erythrocyte sensitivity to the toxin was ranked in descending order: human, sheep, and bovine. toxic activity on artemia nauplii was evaluated using the same crude extract for different exposure periods (3, 5, and 10 hours); only 48 and 72 hour old artemia nauplii showed 50% mortality. partial toxin purification was completed by sequential liquid chromatography using three gels (sephadex g-200, deae sephadex a-50, and sephadex g-100). intramuscular neuroactivity was detected in the crab ocypode quadrata for two partially purified fractions. these fractions were found to have molecular weight components of 66 and 45 kda, respectively.
Didymozoid Monilicaecum type trematodes in chaetognaths from the Mexican Caribbean Sea
Gómez del Prado-Rosas, María del Carmen;álvarez-Cadena, José N;Segura-Puertas, Lourdes;Lamothe-Argumedo, Rafael;
Revista mexicana de biodiversidad , 2007,
Abstract: analyses of 22,508 holoplanktonic chaetognaths collected at 21 stations were made from four oceanographic campaigns along the coasts of quintana roo, mexico, in 1991 (caribe i = february; caribe ii = march; caribe iii = may; caribe iv= august). unencysted larval didymozoid parasites were identified as belonging to the monilicaecum type because of the arrangement of the chambers of the heavily twisted intestinal caeca, which occupy nearly the entire body. these larvae were found in the coelom of seven individuals of the chaetognath flaccisagitta enflata (prevalence = 0.03, mean intensity = 1) and in two of serratosagitta serratodentata (prevalence = 0.009, mean intensity = 1). the mexican caribbean sea is reported as a new locality for this type of helminth larvae.
Summer composition and distribution of the jellyfish (Cnidaria: Medusozoa) in the shelf area off the central Mexican Pacific
Segura-Puertas, Lourdes;Franco-Gordo, Carmen;Suárez-Morales, Eduardo;Gasca, Rebeca;Godínez-Domínguez, Enrique;
Revista mexicana de biodiversidad , 2010,
Abstract: the composition, distribution, and abundance of the jellyfish community of a shelf area of the mexican tropical pacific were surveyed during august 1988. zooplankton samples were collected along transects on the outer and inner sectors of the continental shelf to determine the structure of the jellyfish community and its variation in this area during the rainy season. a total of 23 species were recorded, with aglaura hemistoma, solmundella bitentaculata, liriope tetraphylla, pelagia noctiluca, and rhopalonema velatum being the most abundant. the total abundance of medusae and of the most abundant species was statistically independent of depth and distance to the coast. hence, the total jellyfish abundance of the most abundant species, and shannon's diversity index had a uniform distribution in both the inner and the outer shelf; furthermore, neritic-oceanic forms and oceanic species occurred indistinctly over the entire continental shelf. on the outer shelf a. hemistoma and s. bitentaculata were most abundant; the former species, together with l. tetraphylla, weakly characterized the inner shelf jellyfish community. the narrowness of the shelf, the wide distribution of the most abundant forms, and the possible effect of local advective processes from the oceanic zone masked a definite gradient across the shelf. three species have not been recorded previously in the mexican pacific: amphinema dinema (péron and lesueur, 1810), sarsia coccometra bigelow, 1909, and clytia mccradyi (brooks, 1888). the finding of a. dinema is the first in the eastern pacific.
Primer registro de Phialella quadrata y ampliación del límite de distribución de ocho especies de hidromedusas (Hydrozoa) en el Océano Atlántico Occidental First record of Phialella quadrata and range extension of eight species of hydromedusae (Hydrozoa) in the Western Atlantic Ocean
María de los Angeles Mendoza-Becerril,Alberto Oca?a-Luna,Marina Sánchez-Ramírez,Lourdes Segura-Puertas
Hidrobiológica , 2009,
Abstract: Los nuevos registros que se presentan en este trabajo, amplían la distribución geográfica conocida de nueve especies de hidromedusas, que fueron recolectadas en la Laguna Madre, Tamaulipas, México. La identificación de Phialella quadrata constituye el primer registro para el Océano Atlántico Occidental, mientras que Ectopleura dumortieri lo es para el Golfo de México y Clytia folleata para la región norte del mismo. Se extiende el área geográfica de distribución de Bougainvillia superciliaris, Nemopsis bachei, Sarsia tubulosa y Clytia globosa a menor latitud, mientras que Eirene tenuis y Octophialucium medium a mayor latitud. The new records provided here extend the geographic distribution know of nine hydromedusae species collected in the Laguna Madre, Tamaulipas, Mexico. The record of Phialella quadrata is the first one for the Western Atlantic Ocean, while Ectopleura dumortieri is registered for the first time in the Gulf of Mexico and Clytia folleata in the north of the same gulf. The geographic distribution of Bougainvillia superciliaris, Nemopsis bachei, Sarsia tubulosa and Clytia globosa is extended to a lower latitude, while Eirene tenuis and Octophialucium medium increase to a higher latitude.
Didymozoid Monilicaecum type trematodes in chaetognaths from the Mexican Caribbean Sea Tremátodos didimozoides tipo Monilicaecum en quetognatos del mar caribe mexicano
María del Carmen Gómez del Prado-Rosas,José N álvarez-Cadena,Lourdes Segura-Puertas,Rafael Lamothe-Argumedo
Revista mexicana de biodiversidad , 2007,
Abstract: Analyses of 22,508 holoplanktonic chaetognaths collected at 21 stations were made from four oceanographic campaigns along the coasts of Quintana Roo, Mexico, in 1991 (Caribe I = February; Caribe II = March; Caribe III = May; Caribe IV= August). Unencysted larval didymozoid parasites were identified as belonging to the Monilicaecum type because of the arrangement of the chambers of the heavily twisted intestinal caeca, which occupy nearly the entire body. These larvae were found in the coelom of seven individuals of the chaetognath Flaccisagitta enflata (prevalence = 0.03, mean intensity = 1) and in two of Serratosagitta serratodentata (prevalence = 0.009, mean intensity = 1). The Mexican Caribbean Sea is reported as a new locality for this type of helminth larvae. Se analizan 22,508 quetognatos holoplánticos capturados en 21 estaciones a lo largo de las costas del estado de Quintana Roo, México durante 1991 (Caribe I= febrero; Caribe II= marzo; Caribe III mayo; Caribe IV= agosto). Las formas no enquistadas de los parásitos didimozoides fueron identificadas como tipo Monilicaecum debido al arreglo de las cámaras de los ciegos intestinales fuertemente sinuosas que ocupan casi la totalidad de la cavidad corporal. Las larvas tipo Monilicaecum fueron encontradas en el celoma de siete quetognatos de la especie Flaccisagitta enflata (prevalencia= 0.03; intensidad promedio de parasitismo = 1) y en dos ejemplares de Serratosagitta serratodentata (prevalencia = 0.009, intensidad promedio = 1). El mar caribe mexicano es registrado como una nueva localidad para esta larva de helminto.
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