| Summary: | Total lipid and fatty acid concentrations were studied in a late spring-early summer flagellate-dominated bloom in the Weddell Sea. These indicators were considered a good tool for assessing the quality of organic matter settling from surface to deep-water layers (epibenthic water layers). The results showed different patterns between the early (11-15 December 2003) and the late sampling period (18-27 December 2003) at all studied depths (5 m, 50 m and near-bottom water layers). Low phytoplankton biomass (mainly flagellates) in the first half of the study corresponded to low total lipid and fatty acid concentrations. In the second sampling period a spring bloom (mainly flagellates and diatoms) was detected, increasing the total lipid and fatty acid concentrations in the water column. The amount of settling organic matter from surface waters to the near-bottom water layers was high, especially in the late sampling period. Trophic markers showed evidence of a sink of available organic matter rich in quality and quantity, especially in terms of polyunsaturated fatty acids, for benthic organisms from surface layers to bottom layers in only a few days. The importance of studying short-time cycles in order to detect organic matter availability for benthic biota in view of the pulse-like dynamics of primary production in Antarctic waters is discussed. Transferencia de lípidos del seston durante una floración algal de flagelados desde la superficie hasta el bentos en el mar de Weddell. - Se estudió en el mar de Weddell la concentración de lípidos totales y ácidos grasos en una floración algal de flagelados durante un periodo comprendido entre finales de primavera y principios de verano. Estos dos indicadores (lípidos y ácidos grasos), se consideraron adecuados para describir la calidad de la materia orgánica depositada desde la superficie al fondo (aguas cercanas al bentos marino). Los resultados mostraron un patrón diferenciado entre el principio (11 al 15 de Diciembre) y el final (18 al 27 de Diciembre) del periodo ...
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