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Acquisition de données complémentaires aux dénombrements, avec les techniques d’analyses pigmentaires et de diversité génétique. Etat d’avancement et premiers résultats. Action Indice Composition. Livrable n° AIV. Rapport final, 16 juillet 2014. ArchiMer
Delmas, Daniel; Siano, Raffaele.
Studies on phytoplankton community diversity cannot be limited microphytoplankton (cells>20 ìm), it is indeed necessary to take into account also the nano (3-20ìm) picophytoplankton (<3 ìm) components. In the frame of this work aimed at studying temporal phytoplankton community diversity two complementary methodologies of phytoplankton sample analysis, pigment and genetic (metarbarcoding) diversity, have been used as alternative to routine morphological analysis carried out at light microscopy. The REPHY station (047-P-016 Concarneau Large) off-shore the Concarneau Bay has been sampled during the annual highest phytoplankton production (March-July 2012) with a frequent sample interval strategy (twice per week). Results obtained by both pigment and...
Tipo: Text Palavras-chave: Phytoplancton; Structure de taille; Picophytoplancton; Nanophytoplancton; Microphytoplancton; Diversité génétique; Metabarcoding; Taxonomie pigmentaire; Façade atlantique; Baie de Concarneau; Phytoplankton; Size classes; Picophytoplankton; Nanophytoplankton; Microphytoplankton; Genetic diversity; Metabarcoding; Pigment taxonomy; Atlantic coasts; Concarneau Bay.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00361/47260/47225.pdf
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Analyse de la variabilité spatio-temporelle des populations microalgales côtières observées par le REseau de surveillance du PHYtoplancton et des phycotoxines (REPHY) ArchiMer
Gailhard, Isabelle.
The dynamic of coastal marine microphytoplankton communities is characterized by successions of species assemblages displaying typical schemes of spatio-temporal variability. Numerous studies of phytoplankton spatio-temporal variability have concerned holistic variables such as total biomass or primary production. Such studies deal with the role of primary producers in the global functioning of the pelagic ecosystem, but have little relevance to other problematics. For instance, knowledge of the taxonomic composition of phytoplankton communities and of their spatio-temporal patterns is necessary to understand the mechanisms favouring of the predominance of a precisely identified population within phytoplankton communities. In particular, the identification...
Tipo: Text Palavras-chave: Multivariate statistical analyses; Hydroclimatic factors; Geographical distribution; Temporal Variability; French coasts; Microphytoplankton; Méthodes statistiques multivariées; Facteurs hydroclimatiques; Distribution géographique; Variabilité temporelle; Littoral français; Microphytoplancton.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/these-7.pdf
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Variability patterns of microphytoplankton communities along the French coasts ArchiMer
Gailhard, Isabelle; Gros, Philippe; Durbec, Jp; Beliaeff, Benoit; Belin, Catherine; Nezan, Elisabeth; Lassus, Patrick.
Microalgal populations along French coasts (English Channel, Bay of Biscay and Mediterranean Sea) have been sampled twice a month since 1987 within the context of the French Phytoplankton and Phycotoxin Monitoring Network (REPHY). This study used these data to characterize the large-scale geographical structures of microphytoplankton communities and to determine whether 'homogeneous' geographical areas exist in which microalgal populations display similar temporal variability schemes. Once the temporal variability component shared by all sampled coastal sites was identified, the 'residual' site-specific component was analyzed. Multivariate ordination methods were used to determine seasonal and inter-annual variability. The expected-temporal pattern common...
Tipo: Text Palavras-chave: Microphytoplankton; French coast; Geographical structure; Temporal variability; RV coefficient; Multidimensional scaling.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00000/10033/7596.pdf
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