Transfer of seston lipids during a flagellate bloom from the surface to the benthic community in the Weddell Sea

Sergio Rossi; Enrique Isla; Alfredo Martínez-García; Núria Moraleda; Josep María Gili; Antoni Rosell-Melé; Wolf E. Arntz; Dieter Gerdes

doi:10.3989/scimar.03835.30A

Autores/as

Sergio Rossi Environmental Science and Technology Institute, Autonomous University of Barcelona
Enrique Isla Institut de Ciències del Mar (CSIC)
Alfredo Martínez-García Geologisches Institut NO G 55
Núria Moraleda Environmental Science and Technology Institute, Autonomous University of Barcelona
Josep María Gili Institut de Ciències del Mar (CSIC)
Antoni Rosell-Melé Environmental Science and Technology Institute, Autonomous University of Barcelona - Institució Catalana de Recerca i Estudis Avançats (ICREA)
Wolf E. Arntz Alfred Wegener Institute for Polar and Marine Research
Dieter Gerdes Alfred Wegener Institute for Polar and Marine Research

DOI:

https://doi.org/10.3989/scimar.03835.30A

Palabras clave:

Antártida, seston, lípidos, ácidos grasos, acoplamiento bento-pelágico, alimento disponible

Resumen

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 de muestreo en todas las profundidades analizadas (5 metros, 50 metros y fondo). A la baja biomasa detectada (principalmente flagelados) en la primera parte del estudio correspondió a una concentración baja de lípidos y ácidos grasos. En el segundo periodo, se detectó una floración primaveral (compuesta principalmente por flagelados y diatomeas) que hizo incrementar la concentración de ácidos grasos y lípidos totales en la columna de agua. La caída de materia orgánica disponible para los organismos del fondo fue alta, sobre todo en la última fase del estudio y en coincidencia con la floración algal. Los marcadores, en especial los ácidos grasos poliinsaturados, mostraron un hundimiento relevante de materia disponible para los organismos del fondo en pocos días. En este artículo se discute la importancia de considerar los ciclos intensos de muestreo para detectar la caída en forma de pulsos del alimento disponible provenientes de la producción primaria de superficie para la comunidad bentónica y pelágica en aguas Antárticas.

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