 |
| Titel |
Effects of temperature on the metabolic stoichiometry of Arctic zooplankton |
| VerfasserIn |
M. Alcaraz, R. Almeda, E. Saiz, A. Calbet, C. M. Duarte, S. Agustí  , R. Santiago, A. Alonso |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 2 ; Nr. 10, no. 2 (2013-02-01), S.689-697 |
| Datensatznummer |
250017496
|
| Publikation (Nr.) |
 copernicus.org/bg-10-689-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|