Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 10, issue 2
Biogeosciences, 10, 689–697, 2013
https://doi.org/10.5194/bg-10-689-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 10, 689–697, 2013
https://doi.org/10.5194/bg-10-689-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 01 Feb 2013

Research article | 01 Feb 2013

Effects of temperature on the metabolic stoichiometry of Arctic zooplankton

M. Alcaraz1, R. Almeda1,2, E. Saiz1, A. Calbet1, C. M. Duarte3,4, S. Agustí3,5, R. Santiago3, and A. Alonso1 M. Alcaraz et al.
  • 1Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), Barcelona, Spain
  • 2University of Texas at Austin, Marine Sciences Institute, Port Aransas, Texas, USA
  • 3IMEDEA, Consejo Superior de Investigaciones Científicas (CSIC) – Universitat de les Illes Balears, Esporles, Mallorca, Spain
  • 4The UWA Ocean Institute, University of Western Australia, Crawley, WA, Australia
  • 5The UWA Ocean Institute and School of Plant Biology, University of Western Australia, Crawley, WA, Australia

Abstract. We assessed the relationship between zooplankton metabolism (respiration and inorganic N and P excretion) and "in situ" temperature through a grid of stations representing a range of natural temperature variation during the ATOS-Arctic cruise (July 2007). The objective was to explore not only the direct effects of temperature on zooplankton carbon respiratory losses (hereafter CR) and NH4-N and PO4-P excretion rates (hereafter NE and PE, respectively), but also to investigate whether these metabolic pathways responded similarly to temperature, and so how temperature could affect the stoichiometry of the metabolic products. Metabolic rates, normalised to per unit of zooplankton carbon biomass, increased with increasing temperature following the Arrhenius equation. However, the activation energy differed for the various metabolic processes considered. Respiration, CR, was the metabolic activity least affected by temperature, followed by NE and PE, and as a consequence the values of the CR : NE, CR : PE and NE : PE atomic quotients were inversely related to temperature. The effects of temperature on the stoichiometry of the excreted N and P products would contribute to modifying the nutrient pool available for phytoplankton and induce qualitative and quantitative shifts in the size, community structure and chemical composition of primary producers that could possibly translate to the whole Arctic marine food web.

Publications Copernicus
Download
Citation