Please use this identifier to cite or link to this item:
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).
ISSN: 0142-7873
DOI: 10.1093/plankt/fbu042
Source: Journal of Plankton Research [ISSN 0142-7873], v. 36, p. 1074-1091
Appears in Collections:Artículos
Show full item record


checked on Jun 9, 2024


checked on Jun 9, 2024

Page view(s)

checked on May 23, 2024

Google ScholarTM




Export metadata

Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.