Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/49860
Title: Metabolic state along a summer north-south transect near the Antarctic Peninsula: A size spectra approach
Authors: García-Muñoz, Cristina
García, Carlos M.
Lubián, Luis M.
López-Urrutia, Ángel
Hernández-León, Santiago 
Ameneiro, Julia
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Metabolic state
Normalized biomass size spectra
South Shetland Islands
Issue Date: 2014
Publisher: 0142-7873
Project: Acoplamiento Físico-Biológico en El Rango de la Mesoscala Alrededor de Las Islas Shetland Del Sur (Antártida): Soporte Físico y Zooplancton. 
Journal: Journal of Plankton Research 
Abstract: To establish a metabolic state along a north–south transect in Antarctic waters, we approached community respiration (CR) from a combined perspective based on the metabolic theory of ecology (MTE) and the size-scaling of the whole planktonic community. A detailed analysis of a summer integrated multi-trophic normalized biomass size spectra (NBSS), from heterotrophic bacteria to zooplankton, was carried out. To acquire individual size data, different techniques were combined: flow cytometry for smaller fractions (<20 µm of equivalent spherical diameter), FlowCAM for larger nano- and microplankton and scanning and image analysis for the zooplankton fractions. The distribution of the NBSS was linear at all stations (R2 values: 0.87–0.93) but dome-shape features appeared related to phytoplankton cell distribution which are responsible for a large fraction of microbial respiration. Generally, the region showed an autotrophic budget south of the archipelago due to gross primary production (GPP) values up to 2804 mg C m−2 day−1, where salps could significantly contribute to the carbon export flux. Contrastingly, higher CR rates (>1000 mg C m−2 day−1) were found at the northern stations due to a higher phytoplankton respiration activity associated with increasing sea water temperatures and a higher presence of heterotrophic organisms (microheterotrophs, chaetognaths and copepods) resulting in a net heterotrophic metabolic state (GPP/CR < 1).
URI: http://hdl.handle.net/10553/49860
ISSN: 0142-7873
DOI: 10.1093/plankt/fbu042
Source: Journal of Plankton Research [ISSN 0142-7873], v. 36, p. 1074-1091
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