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| Titel |
Consequences of respiration in the light on the determination of production in pelagic systems |
| VerfasserIn |
O. Pringault, V. Tassas, E. Rochelle-Newall |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 4, no. 1 ; Nr. 4, no. 1 (2007-01-26), S.105-114 |
| Datensatznummer |
250001502
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| Publikation (Nr.) |
 copernicus.org/bg-4-105-2007.pdf |
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| Zusammenfassung |
| Oxygen microprobes were used to estimate Community Respiration (R), Net
Community Production (NCP) and Gross Primary Production (GPP) in coastal
seawater samples. Using this highly stable and reproducible technique to
measure oxygen change during alternating dark and light periods, we show
that respiration in the light could account for up to 640% of respiration
in the dark. The light enhanced dark respiration can remain elevated for
several hours following a 12 h period of illumination. Not including
Rlight into calculations of production leads to an underestimation of
GPP, which can reach up to 650% in net heterotrophic systems. The
production: respiration (P:R) ratio is in turn affected by the higher
respiration rates and by the underestimation of GPP. While the integration
of Rlight into the calculation of P:R ratio does not change the
metabolic balance of the system, it decreases the observed tendency, thus
net autotrophic systems become less autotrophic and net heterotrophic
systems become less heterotrophic. As a consequence, we propose that efforts
have to be focused on the estimation and the integration of Rlight into
the determination of GPP and R for a better understanding of the aquatic
carbon cycle. |
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