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Search Results: 1 - 10 of 179468 matches for " De La Hoz Aristizábal "
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PRIMER REGISTRO EN COLOMBIA DE CORBICULA FLUMINEA (MOLLUSCA: BIVALVIA: CORBICULIDAE), UNA ESPECIE INVASOR
De La Hoz Aristizábal,Maria V.;
Boletín de Investigaciones Marinas y Costeras - INVEMAR , 2008,
Abstract: the bivalve corbicula fluminea müller is recorded for the first time in colombia, in the national park isla de salamanca. this protected area includes freshwater channels and mixohaline lagoons influenced by waters of both the magdalena river and the caribbean sea. this exotic bivalve occurs locally in freshwater channels close to the magdalena river as well as in the latter, whereas another corbiculid native species, polymesoda solida, is commonly found in the mixohaline lagoons. densities of c. fluminea ranged from 10 to 100 ind/m2 along with low numbers of p. solida. lengths ranged form 10 to 43 mm in a predominant muddy substrate. local fishermen have stated that c. fluminea was established approximately in 1992; this clam is being artisanally exploited for human consumption along with p. solida, although fishery is mainly focused on the latter, due to its larger size.
DINáMICA DEL FITOPLANCTON DE LA CIéNAGA GRANDE DE SANTA MARTA, CARIBE COLOMBIANO
De La Hoz Aristizábal,María Virginia;
Boletín de Investigaciones Marinas y Costeras - INVEMAR , 2004,
Abstract: in order to assess phytoplankton dynamics in the ciénaga grande de santa marta, bimonthly sampling was done at six stations from march 1996 to february 1997. salinity showed wide ranges so the year could be divided in four seasons. higher salinities were related to higher phytoplankton density, while lower salinities were related to lower phytoplankton densities and increased species richness. 224 taxa were recorded, and the general trend was towards a low diversity with a few dominant species, and most of them rare. cyanophytes showed the highest abundances all year. salinity, turbidity and orthophosphates were the environmental factors best related to the biotic data. seasonal changes in phytoplankton concerning to meteorological conditions, fresh and tidal floods and dredging of clarín canal are discussed.
Condición somática de la almeja Polymesoda solida (Veneroidea: Corbiculidae) durante el periodo lluvioso, enel Parque Natural Isla de Salamanca, Caribe colombiano
De La Hoz Aristizábal,María Virginia;
Revista de Biología Tropical , 2010,
Abstract: somatic condition of the clam polymesoda solida (veneroidea: corbiculidae) in the rainy season of the salamanca island natural park, colombian caribbean. the estuarine clam polymesoda solida is the main fishery resource in the salamanca island natural park. i sampled the clam in three interconnected lagoons (poza verde, el torno and atascosa) during the rainy period (april to november 2004). sixty individuals were monthly collected by hand on each lagoon; 30 to analyze two condition indexes (relationship between body and shell weight and between soft dry and wet weight), yield (meat percentage) and length-weight relationships. maturity of female gonad smears was assessed on the remaining individuals. measures of salinity, temperature, ph, dissolved oxygen, transparency and depth, were also taken at the collection places. increases of the condition indexes occurred when the magdalena river showed some decreases in its level, especially at poza verde and el torno. the condition indexes were higher at 27-33mm, (range where maturity size was reached). clams from poza verde, the lagoon nearest to the magdalena river, had the highest values in condition indexes, yield, fresh weight and maturity frequency. yield was directly correlated to the condition indexes and sexual maturity. the condition index (body weight/shell weight) showed a highest multiple regression coefficient with salinity, ph and transparency (r2=74%), indicating the relevance of the hydrological regime in the regulation of the condition of the organisms. p. solida seems to be more adapted to the lowest salinities of the system (0.0-0.4), corresponding to poza verde, where the influence of the magdalena river is more direct and steady. additionally, differences found between sites in the assessed variables, emphasize the importance of considering spatial heterogeneity of this kind of lagoon estuaries, and should be taken into account for future fisheries management in the rainy period and conservation of p
Condición somática de la almeja Polymesoda solida (Veneroidea: Corbiculidae) durante el periodo lluvioso, enel Parque Natural Isla de Salamanca, Caribe colombiano
María Virginia De La Hoz Aristizábal
Revista de Biología Tropical , 2010,
Abstract: Se evaluó la condición somática de la almeja Polymesoda solida en tres lagunas del Parque Isla de Salamanca (abril a noviembre de 2004), durante el periodo lluvioso. En 60 individuos por laguna, se analizaron mensualmente índices de condición, rendimiento, relación talla-peso y madurez gonadal en fresco. También se midió salinidad, temperatura, pH, oxígeno disuelto, transparencia y profundidad del agua. Los mayores índices de condición coincidieron con descensos en el nivel del río Magdalena, especialmente en Poza Verde y El Torno. Estos índices fueron más altos en tallas entre 27mm y 33mm, donde también se ubicó la talla media de madurez sexual. En Poza Verde, laguna con mayor influencia del río, se presentaron los mayores índices de condición, rendimiento, peso húmedo y frecuencia de madurez, revelando una mejor condición de los organismos. El índice de condición (peso cuerpo/ peso concha) presentó mayor coeficiente de regresión múltiple con la salinidad, pH y transparencia, sugiriendo la importancia del régimen hidrológico en su regulación. Las diferencias espaciales en las variables evaluadas, resaltan la necesidad de tener en cuenta la heterogeneidad de este tipo de estuarios para la conservación y manejo adecuado de la pesquería de P. solida. Somatic condition of the clam Polymesoda solida (Veneroidea: Corbiculidae) in the rainy season of the Salamanca Island Natural Park, Colombian Caribbean. The estuarine clam Polymesoda solida is the main fishery resource in the Salamanca Island Natural Park. I sampled the clam in three interconnected lagoons (Poza Verde, El Torno and Atascosa) during the rainy period (April to November 2004). Sixty individuals were monthly collected by hand on each lagoon; 30 to analyze two condition indexes (relationship between body and shell weight and between soft dry and wet weight), yield (meat percentage) and length-weight relationships. Maturity of female gonad smears was assessed on the remaining individuals. Measures of salinity, temperature, pH, dissolved oxygen, transparency and depth, were also taken at the collection places. Increases of the condition indexes occurred when the Magdalena River showed some decreases in its level, especially at Poza Verde and El Torno. The condition indexes were higher at 27-33mm, (range where maturity size was reached). Clams from Poza Verde, the lagoon nearest to the Magdalena River, had the highest values in condition indexes, yield, fresh weight and maturity frequency. Yield was directly correlated to the condition indexes and sexual maturity. The condition index (body weight/sh
Sede del comité olímpico espa ol, Madrid-Espa a
de la Hoz, Rafael
Informes de la Construccion , 1996,
Abstract: Two complementary concepts, Olympics and educational, have determined the architecture of the headquarters of the Spanish Olympic Committee, Madrid, this building is well distinguished of the surrounding area. Its character and classic proportions which suggest the total composition are presented as clear reference to the Olympic ideas. Dos conceptos complementarios, el olímpico y el docente, han determinado la arquitectura de este edificio que se erige como una pieza destacada en el contexto circundante. Su carácter y las proporciones clásicas que inspiran el conjunto de la composición se presentan como una clara referencia a los orígenes del olimpismo.
Influenza pandémica 2009-2010, en qué podemos mejorar la respuesta?
Fernando De la Hoz
Biomédica , 2009,
Abstract:
A matrix-based numerical method for the simulation of the two-dimensional sine-Gordon equation*, **
de la Hoz Francisco
ESAIM : Proceedings , 2012, DOI: 10.1051/proc/201235017
Abstract: This paper describes a numerical method for the two-dimensional sine-Gordon equation over a rectangular domain using differentiation matrices, in the theoretical frame of matrix differential equations. Cette courte note décrit une méthode numérique pour l’équation de sine-Gordon bidimensionnelle sur un domaine rectangulaire en utilisant des matrices de différenciation, dans le cadre théorique des équations différentielles matricielles.
Numerical study of a flow of regular planar curves that develop singularities at finite time
Francisco de la Hoz
Mathematics , 2008,
Abstract: In this paper, we will study the following geometric flow, obtained by Goldstein and Petrich while considering the evolution of a vortex patch in the plane under Euler's equations, X_t = -k_s n - (1/2) k^2 T, with s being the arc-length parameter and k the curvature. Perelman and Vega proved that this flow has a one-parameter family of regular solutions that develop a corner-shaped singularity at finite time. We will give a method to reproduce numerically the evolution of those solutions, as well as the formation of the corner, showing several properties associated to them.
Aspectos cinemáticos del mecanismo de mordida premaxilar en los géneros Cauque, Basilichthys y Austromenidia (Teleostei, Atherinidae)
DE LA HOZ U,EDUARDO;
Investigaciones marinas , 1994, DOI: 10.4067/S0717-71781994002200003
Abstract: the premaxillary bite mechanism of various species ofthe genera cauque, austromenidia and basilichthys are analyzed through the four-bar linkage models; these models allow the description ofthe nature ofthe buccal structures movements. in cauque and austromenidia the angular trajectories of premaxilla and maxilla are similar, they show an increasing premaxilla velocity towards the ciosing position. in the basilichthys species, the premaxilla movement is shorter than that of the mandible, and its velocity is maintained constant during all the trajectory. the functional characteristics of the mechanism are related to the following structural ratios: mandibular edge / quadrate-palatine distance, mandibular edge / premaxilla length, quadrate-palatine distance / maximal premaxillary protrusion, and quadrate-palatine distance / mandibular edge
Reflexiones en torno a las competencias como objeto de evaluación en el ámbito educativo
Orden Hoz, Arturo de la;
Revista electrónica de investigación educativa , 2011,
Abstract: ensuring a positive impact of assessment on competency based education (cbe) requires, obviously, an educationally valid assessment system. it is therefore necessary that competency be specified and defined as an object of assessment. following a review of the relevant literature, this article presents two conceptions of competency: 1) competency as effective and efficient performance of a function or role in a given area, and 2) competency as an integrated combination of knowledge, abilities, skills and attitudes. the first conception of competency calls for a more holistic evaluation model, which is to say a comprehensive appraisal of competency, rather than an analytical assessment of its requirements. with regard to the second conception of competency, a theoretically adequate model is the one known as performance assessment. the article concludes with a reference to advanced models of performance assessment and to their design structure, closing with a brief allusion to the validation of competency assessment systems.
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