Multi-parametric relationships between PAM measurements and carbon incorporation, an in situ approach.

TitreMulti-parametric relationships between PAM measurements and carbon incorporation, an in situ approach.
Type de publicationJournal Article
Year of Publication2012
AuteursNapoléon, C, Claquin, P
JournalPLoS One
Volume7
Ticket7
Paginatione40284
Date Published2012
ISSN1932-6203
Mots-clésCarbon, Carbon Isotopes, Cluster Analysis, Electric Conductivity, Electrons, Fluorometry, Geography
Résumé

Primary production (PP) in the English Channel was measured using (13)C uptake and compared to the electron transport rate (ETR) measured using PAM (pulse amplitude modulated fluorometer). The relationship between carbon incorporation (P(obs)) and ETR was not linear but logarithmic. This result can be explained by alternative electron sinks at high irradiance which protect the phytoplankton from photoinhibition. A multi-parametric model was developed to estimate PP by ETR. This approach highlighted the importance of taking physicochemical parameters like incident light and nutrient concentrations into account. The variation in the ETR/P(obs) ratio as a function of the light revealed different trends which were characterized by three parameters (R(max), the maximum value of ETR/P(obs); E(Rmax), the light intensity at which R(max) is measured; γ the initial slope of the curve). Based on the values of these three parameters, data were divided into six groups which were highly dependent on the seasons and on the physicochemical conditions. Using the multi-parametric model which we defined by P(obs) and ETR measurements at low frequencies, the high frequency measurements of ETR enabled us to estimate the primary production capacity between November 2009 and December 2010 at high temporal and spatial scales.

DOI10.1371/journal.pone.0040284
Alternate JournalPLoS ONE
Identifiant (ID) PubMed22911698
PubMed Central IDPMC3401225