| Summary: | 14 pages, 3 tables, 11 figures.-- Tercer Symposium Español de Estudios Antárticos celebrado del 3 al 5 de octubre de 1989 en Gredos.-- Actas completas http://hdl.handle.net/10261/198567 [EN] During the southern summer of 1988-89, the R.V. Professor Siedlecki made an oceanographic cruise along the ice between Elephant lsland and the South Orkneys. The intention was to test the hypothesis of various authors that the melting of the pack-ice is responsible far production in Antartic waters. Since in the Antartic Ocean, and in particular in the ice free regions of the Wedde/1 Sea, production seems to be limited by the physical homogenity of the water column, the fresh water which results from the melting of the packice may cause sufficient stability at the surface to allows the development of phytoplankton populations. The results obtained during this cruise show that, in the region studied, it is the convergence of Scotia Sea and Weddell Sea water which is responsible far the necessary stability in the photic zone. The stability is generated by a series of surface meanders of the Antartic Circumpolar Current, which al/ow phytoplankton biomass to acumulate in the contact zone with Weddell Sea water. lt is concluded that this situation has a typical frontal structure, with phytoplankton patches in the convergence between two water masses. In these circumstances, the benefit of ice melting, if any, remains obscure [ES] Durante el verano austral de 1988-89 el B.O. Profesor Siedlecki realizó una campaña oceanográfica al borde del hielo entre la isla Elefante y las islas Oreadas del Sur. Se pretendía comprobar la hipótesis formulada por diversos autores, según la cual el deshielo del pack-ice era el responsable de la producción en las aguas antárticas. Puesto que en el océano Antártico y, especialmente, en las aguas libres de hielo del mar de Wedde/1, la homogeneidad física de la columna de agua parece ser el factor limitante de la producción, el agua dulce resultante del deshielo del pack-ice generaría una ...
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