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Search Results: 1 - 10 of 362 matches for " Arana "
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Representando la complejidad ambiental: Dos estudios de caso
Arana,Aracelis;
Investigación y Postgrado , 2007,
Abstract: undertaking the complexity of environmental systems as a thematic content leads to the application of pedagogical methods intended to the construction of mental models in students, which represent such complexity. in such sense, a learning strategy is necessary in order to asses the progress of students regarding the construction of their knowledge about the environment as well as their relationships, interpretations and transferences when applied to particular situations of reality. the main purpose of this research is studying the construction of a mental model about the environmental complexity, in order for students of the master?s degree in education, minor in teaching of biology of the universidad pedagógica experimental libertador (upel), to develop an integrating vision of the environmental systems dynamic through the application of a proposed conceptual model intended to specify the relationships and interactions occurring between the social and natural components in a specific space and derivating from such model performance. in executing this model, the activation of cognitive and metacognitive process was promoted due to its great relevance in the construction of the scientific concepts.
Entramados ambientales: Un modelo didáctico integrador
Arana,Aracelis;
Educere , 2007,
Abstract: tackling the complexity of environmental systems as thematic content, leads to the implementation of pedagogical methods destined to building, in students, mental models that are representative of such complexity. in this sense, a teaching strategy is required that allows evidencing student progress regarding the building of their knowledge about environment, such as: relationships, interpretations and transfers it performs when they are applied in specific reality situations. the didactic model presented aims mainly to develop students of environmental education in the venezuelan educational context an integrative vision of the dynamics of environmental systems from an interpretative analysis of its complexity. with its implementation cognitive and metacognitive processes of special relevance were activated in the development of cognitive, procedural and attitudinal competences, for the understanding of environmental dynamics.
Reproductive aspects of the Patagonian toothfish (Dissostichus eleginoides) off southern Chile
Arana,Patricio;
Latin american journal of aquatic research , 2009,
Abstract: we present the results for the reproductive biology of patagonian toothfish (dissostichus eleginoides) caught off southern chile from january to march and june to november 2006. a total of 10,896 specimens were measured (55-220 cm total length, tl) and sexed (7,049 males, 64.7%; and 3,847 females, 35.3%). macroscopic observations showed that gonad maturation begins at 60 cm tl in both sexes, with an average maturation size of 81 cm tl in males and 89 cm tl in females. this species appears to have an ampie spawning period that occurs only off the far southern region of chile. to date, no evidence indicates that this resource reproduces in any other areas of the pacific ocean off the coasts of south américa, where no specimens were observed with mature gonads, percentages of atresia were high, and juvenile fish were not caught in trawl fishing operations targeting other commercial species.
Reproductive aspects of the Patagonian toothfish (Dissostichus eleginoides) off southern Chile Aspectos reproductivos del bacalao de profundidad (Dissostichus eleginoides) en el extremo austral de Chile
Patricio Arana
Latin american journal of aquatic research , 2009,
Abstract: We present the results for the reproductive biology of Patagonian toothfish (Dissostichus eleginoides) caught off southern Chile from January to March and June to November 2006. A total of 10,896 specimens were measured (55-220 cm total length, TL) and sexed (7,049 males, 64.7%; and 3,847 females, 35.3%). Macroscopic observations showed that gonad maturation begins at 60 cm TL in both sexes, with an average maturation size of 81 cm TL in males and 89 cm TL in females. This species appears to have an ampie spawning period that occurs only off the far southern region of Chile. To date, no evidence indicates that this resource reproduces in any other areas of the Pacific Ocean off the coasts of South América, where no specimens were observed with mature gonads, percentages of atresia were high, and juvenile fish were not caught in trawl fishing operations targeting other commercial species. Se dan a conocer resultados sobre la biología reproductiva del bacalao de profundidad (Dissostichus eleginoides) capturado en el extremo sur-austral de Chile, entre enero y marzo y de junio a noviembre de 2006. En dicho período se midió y determinó el sexo a 10.896 ejemplares, comprendidos entre 55 y 220 cm de longitud total (LT), de los cuales 7.049 correspondieron a machos (64,7%) y 3.847 a hembras (35,3%). Mediante la observación macroscópica de las gónadas se determinó que en machos y hembras se observa el comienzo de la maduración gonádica a partir de 60 cm de LT, con una talla media de maduración (TMS50%) en machos a 81 cm y en hembras a 89 cm. Se sugiere que esta especie presenta un período amplio de desove y que este proceso se efectuaría únicamente en la región austral de Chile, destacándose que hasta ahora no se cuenta con evidencias que este recurso se reproduzca en otra zona del océano Pacífico frente a la costa de Sudamérica en atención a la ausencia de ejemplares maduros en las capturas, altos porcentajes de atresia y ausencia de peces juveniles en faenas de pesca de arrastre dirigidas a otras especies comerciales.
La larga marcha hacia la libertad. La evolución ideológica de Octavio Paz
Arana, Juan
Isegoría , 2000,
Abstract: Not Available Octavio Paz se vio inmerso a lo largo de su vida en los acontecimientos más significativos del siglo XX. Este contacto directo con la historia le llevó a cuestionar repetidas veces los principios básicos de la acción política y los valores que deben sustentarla. En este trabajo se analizan las diversas fases de la evolución ideológica de Paz, que no estuvo subordinada a las urgencias de una ambición personal, lo que le permitió zafarse del oportunismo de tantos intelectuales latinoamericanos. En lugar de ir a remolque de los tiempos, sus reflexiones responden a la lógica de un desarrollo interno, que profundiza progresivamente en el alcance y las consecuencias de la idea de libertad, una libertad que es concebida lejos del limbo de las abstracciones y se piensa cada vez más en función de las exigencias irrenunciables del hombre de carne y hueso.
Experiencias de pesca con red de enmalle en las islas Robinson Crusoe y Santa Clara, Chile
Arana,Patricio M.;
Investigaciones marinas , 2000, DOI: 10.4067/S0717-71782000002800017
Abstract: the gillnet fishing survey was conducted around robison crusoe and santa clara islands (juan fernandez archipelago, chile) in january-february 1997. a total of 14 hauls at different locations around these islands were taken, with a total catch of 599 kg in 106 hours of soak. the main resources caught sorted by weight were: juan fernandez catshark, squalus mitsukurii (53.9%); juan fernandez mackerel, pseudocaranx chilensis (19.9%); juan fernandez croaker, umbrina reedi (7.8%); yellowtail, seriola peruanus (7.3%); juan fernandez opaleye, girella albostriata (7.2%); and, other species (3.8%). these experiences showed that this gear can be easily and securely set in different places around these islands. besides, the catch levels obtained makes its use quite attractive for the purpose of obtaining fishes, most of which are species of high quality, and have the appropriate size and weight required for human consumption or for to be used as bait in lobster traps
Camarón navaja (Campylonotus semistriatus), crustáceo de aguas profundas frente a la costa central de Chile (Crustacea, Decapoda, Campylonotidae)
Arana,Patricio; Ahumada,Mauricio;
Investigaciones marinas , 2006, DOI: 10.4067/S0717-71782006000100001
Abstract: during exploratory fishing tasks performed in the continental slope in 2002 and 2003, the presence of the razor shrimp (campylonotus semistriatus) was detected at depths of 570-682 m (32o10?-34o42?s) and 490-955 m (32o10?-36o00?s) respectively. cephalothorax lengths between 11 and 37 mm and in 2003 were between 13 and 37 mm, females were larger than males. the variability of average size was explained both by variations in depth and by mean latitude (p < 0.05). larger individuals toward higher latitudes and between 700 and 800 m depth. sizes at first sexual maturity were 21.3 and 21.1 mm (cephalothorax length) in 2002 and 2003, respectively. the relationships between length and weight indicated a negative alometry. catches per unit of area (cpua) were low, averaging 94.6 and 98.9 kg·km-2 each year. this crustacean, previously reported in the south atlantic and pacific as far as 38os, is now present in the pacific up to 32os. because of its low concentrations at the sea bottom, the fish profiled as a complementary resource for nylon shrimp (heterocarpus reedi) or red royal shrimp (haliporoides diomedeae)
Estimación de abundancia y biomasa del cangrejo dorado (Chaceon chilensis), en el archipiélago de Juan Fernández, Chile
Arana,Patricio M.;
Investigaciones marinas , 2000, DOI: 10.4067/S0717-71782000002800006
Abstract: the fishery-biology aspects of the juan fernandez golden crab (chaceon chilensis), and first estimates of the abundance and biomass of this resource distributed in the marine substrate surrounding robinson crusoe and santa clara islands are given. information was obtained from samples taken within an experimental fishing survey for this crustacean, between 175 to 600 m depth, from march to june 1997. the theoretical area of influence methodology was used to estimate the abundance and biomass. due to the degree of uncertainty of the variables employed, some parameters were sensibilized in order to obtain a range of estimates, along with its most likely value. results indicate that the fishery of this resource is characterized by its catch mainly composed by males (97,8%), in the different types of traps used as well as in the whole bathymetric range surveyed. specimens' length were between 84 and 147 mm of cephalothoraxic length. maximum and minimum observed total weights were 250 and 1410 g respectively. the mean weight of a specimen (male) was 863 g. first most likely estimate of the golden crab available biomass, having sensibilized the area of influence of the trap, was determined to be 995,3 tons, that is a mean density of 2,9 individual/1000 m2 and a maximum sustainable yield (msy) of 75 tons. in the worst of the estimates scenery a msy of 19 tons was obtained, and in the most optimistic scenery it reached 168 tons
Pesca exploratoria con trampas alrededor de las islas Robinson Crusoe y Santa Clara, archipiélago de Juan Fernández, Chile
Arana,Patricio M.;
Investigaciones marinas , 2000, DOI: 10.4067/S0717-71782000002800005
Abstract: looking for alternative resources to the juan fernandez spiny rock lobster (jasus frontalis), the traditional target species of the artisanal fishermen of the archipelago, an exploratory fishing campaign with fishing pots was conducted around robinson crusoe and santa clara islands. between november 11, 1996, and march 23, 1997, a total of 71 fishing journeys were conducted, during which 241 pots were set between 50 and 1000 m depth. in these experiences different pot designs were used: conical-trunk, tetragonal, piramidal, and lobster pots with a wicket on one extreme and lobster pot with an upper wicket. the last two, are the ones often used by the archipelago fishermen to catch lobsters. the conical-trunk, tetragonal and piramidal pots were with circular or rectangular wickets. the resources caught were: juan fernandez spiny rock lobster (jasus frontalis), juan fernandez king crab (paromola rathbuni), rowing crab (ovalipes trimaculatus) and golden crab (chaceon chilensis). the spiny rock lobster was captured between 50 and 100 m depth, while the rowing crab was found only in the 100 m isobath; juan fernandez king crab between 100 and 300 m and the golden crab between 200 and 1000 m. the only resource with fishing interest is c. chilensis, both by its abundance as well as for its wide distribution in depth and around these islands
Apertura comercial, balanza comercial e inversión extranjera directa en México, 1980-2006
Rodríguez Arana, Alejandro;
Investigación económica , 2009,
Abstract: using autoregressive distributive lag techniques (ardl), this paper sets four structural equations for non oil exports, oil exports, total imports and real foreign direct investment (fdi) in mexico. trade liberalization is modeled through dummy variables and the implicit national export and import tariffs. during the first part of the process of trade liberalization in mexico (1982-1993), there was a severe structural deterioration of the trade balance in mexico. fdi increased but just slightly. in a second part that started in 1994, the north american free trade agreement (nafta) generate high amounts of fdi flows. howerer, this reverted the deteriotation only partially.
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