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Título

Metabolism and biomass vertical distribution of zooplankton in the Bransfield Strait during the austral summer of 2000

AutorYebra, Lidia ; Hernández León, Santiago; Almeida, Carlos; Bécognée, Pierrick
Palabras claveAARS
Antarctic Peninsula
ETS
Metabolism
Zooplankton
Fecha de publicacióndic-2009
EditorCo-Action Publishing
CitaciónPolar Research 28(3): 415-425 (2009)
ResumenThe vertical distribution (0–550 m) of zooplankton biomass, and indices of respiration (electron transfer system [ETS]) and structural growth (aminoacyltRNA synthetases activity [AARS]), were studied in waters off the Antarctic Peninsula during the austral summer of 2000. The dominant species were the copepod Metridia gerlachei and the euphausiid Euphausia superba. We observed a vertical krill/copepod substitution in the water column. The zooplankton biomass in the layer at a depth of 200–500 m was of the same magnitude as the biomass in the layer at a depth of 0–200 m, indicating that biomass in the mesopelagic zone is an important fraction of the total zooplankton in Antarctic waters. The metabolic rates of the zooplankton community were sustained by less than 0.5% of the primary production in the area, suggesting that microplankton or small copepods are the main food source. Neither food availability nor predation seemed to control mesozooplankton biomass. The wide time lag between the abundance peak of the dominant copepod (M. gerlachei) and the phytoplankton bloom is suggested to be the main explanation for the low summer zooplankton biomass observed in these waters
Descripción11 pages, 3 figures, 2 tables
Versión del editorhttp://dx.doi.org/10.1111/j.1751-8369.2009.00116.x
URIhttp://hdl.handle.net/10261/19615
DOI10.1111/j.1751-8369.2009.00116.x
ISSN0800-0395
E-ISSN1751-8369
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