957 resultados para Universidad Nacional de Mar del Plata


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Fil: Barcos, María Fernanda. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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El presente artículo pretende reconstruir el proceso de luchas sociales y políticas que transitaba la sociedad argentina a mediados de la década de 1950 desde una perspectiva local. El diálogo entre la realidad nacional y la local tiene por intención problematizar las interpretaciones vigentes a la luz de la experiencia marplatense. El trabajo comienza situando a la 'revolución libertadora' como un hito en la historia argentina, luego recrea el clima de época en Mar del Plata para, finalmente, hacer una descripción analítica de la coyuntura golpista en la ciudad. Tras la reconstrucción histórica del período, en las reflexiones finales, el autor arriesga una interpretación del proceso como de incipiente guerra civil y caracteriza lo acaecido en Mar del Plata a partir del 19 de septiembre como un preludio de lo que sucedería en la sociedad argentina desde el golpe del 13 de noviembre de 1955

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The present paper deals with the trophic relationships of the communities of the coastal fishing area of Mar del Plata (Argentine). Different trophic levels of two main food chains (pelagic-demersal and benthic-demersal)were established. There are connections between both chains through certain species of invertebrates and fishes. This first try to establish the trophic relationships of our most important littoral communities, aims to set the preliminary bases for future energetic flow studies through the trophic web that gives a real economic importance to this productive area. (Document contains 45 pages)

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Segundo Congreso Internacional CELEHIS de Literatura.

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This paper deals with the Calanoidean Copepod of the Mar del Plata area (Province of Buenos Aires, Argentina) which were obtained in 71 starions during 5 oceanographic cruises performed on April, August-September and December, 1963 and on March and May, 1964. The area under study ranges from 37°20' to 38°45' L.S. and from 56°30' to 58°10' L.W. The samples were gathered from coastal, surface waters. Quantitative data could not be obtaine, except for and estimation of the time of flow through the plakton net. A total of 13 species of Calanoid Copepods were found. The species found were described, and drawings were made of those structures wich ere considered of taxonomic value. Data were included on the geographic distribution, with emphasis on South Atlantic and areas Antarctic.

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The individuals studied came from commercial catches on the coastal area off Mar del Plata. The monthly distribution of sizes shows that the juvenile stay in coastal waters, while the adult individuals leave those waters during winter season to return there in the spring during the season of sexual maturation and spawning, when the water reaches temperature of 10-11°C. The jack mackerel is a relatively small fish, compared with other species of its genus, and has a total length of scarcely 25 cm. The comparison of indexes and mesurements does not reveal any marked difference between sexes, except for the total length, which is greater in the females. Sexually nature individuals at a lenth of 13 cm have been found. Spawning takes place in coastal waters. A great part of the population spawns from December to January. There are oscillations ranging from November to March. On this latter month mature individuals of smaller size have veen found. The jack mackerel feeds usually on copepods and other planktonic organims, but it can feed also on juveniles of other fishes. This fish is caught throghout the whole year. The catches show their greater peak during winter; one other non-constant peak occurs during the spring (October-November) and declines shoraply during the summer months. It follows from this that the time of greates catch does not coincide with spawning season, or with the appearence of the greatest mean sizes. This happens because the interests of the fishermen are attracted during those months by others species of greater commercial value.