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210Po and 210Pb trophic transfer within the phytoplankton–zooplankton–anchovy/sardine food web: a case study from the Gulf of Lion (NW Mediterranean Sea) ArchiMer
Strady, Emilie; Harmelin-vivien, Mireille; Chiffoleau, Jean-francois; Veron, Alain; Tronczynski, Jacek; Radakovitch, Olivier.
The transfer of 210Po and 210Pb in the food web of small pelagic fishes (from phytoplankton and zooplankton to anchovy Engraulis encrasicolus and sardine Sardina pilchardus) is investigated in the Gulf of Lion (GoL). We present original data of 210Po and 210Pb activity concentrations, C and N stable isotope ratios, measured (i) from different size classes of phytoplankton and zooplankton during spring and winter in different environments of the GoL, and (ii) in two fish species. Significant spatial patterns based on 210Po, 210Pb activity concentrations and 210Po/210Pb ratios in the different plankton size classes are evidenced by hierarchical clustering, both in spring and winter. This variability, also observed for C and N stable isotopes ratios, is...
Tipo: Text Palavras-chave: Po-210; Pb-210; Phytoplankton; Zooplankton; Pelagic fishes; Mediterranean Sea.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00255/36609/35264.pdf
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A Feedback Mechanism to Control Apoptosis Occurs in the Digestive Gland of the Oyster Crassostrea gigas Exposed to the Paralytic Shellfish Toxins Producer Alexandrium catenella ArchiMer
Rolland, Jean-luc; Medhioub, Walid; Vergnes, Agnes; Abi-khalil, Celina; Savar, Veronique; Abadie, Eric; Masseret, Estelle; Amzil, Zouher; Laabir, Mohamed.
To better understand the effect of Paralytic Shellfish Toxins (PSTs) accumulation in the digestive gland of the Pacific oyster, Crassostrea gigas, we experimentally exposed individual oysters for 48 h to a PSTs producer, the dinoflagellate Alexandrium catenella. In comparison to the effect of the non-toxic Alexandrium tamarense, on the eight apoptotic related genes tested, Bax and BI.1 were significantly upregulated in oysters exposed 48 h to A. catenella. Among the five detoxification related genes tested, the expression of cytochrome P450 (CYP1A) was shown to be correlated with toxin concentration in the digestive gland of oysters exposed to the toxic dinoflagellate. Beside this, we observed a significant increase in ROS production, a decrease in...
Tipo: Text Palavras-chave: Shellfish; Toxin; Biomarker; Expression; Phytoplankton.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00225/33606/32003.pdf
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A non-linear software sensor to monitor the internal nitrogen quota of phytoplanktonic cells ArchiMer
Bernard, O; Sciandra, A; Sallet, G.
New techniques - called software sensors - issued from the non-linear automatic control field and initially developed for non-linear chemical systems have been applied to a continuous culture of phytoplankton. A software sensor (or 'observer') combines an analytical differential equation based model and partial measurements of the system in order to estimate the non-measured state variables. It filters data and estimates the actual state of living systems, models of which are often rough approximations. The efficiency of this approach is illustrated with a nitrate-limited chemostat experiment with the chlorophyceae Dunaliella tertiolecta performed in a computer controlled fluctuating environment. (C) 2001 Ifremer/CNRS/IRD/Editions scientifiques et...
Tipo: Text Palavras-chave: Modèle de Droop; Systèmes non linéaires; Observateurs; Phytoplancton; Droop model; Non-linear systems; Observers; Phytoplankton.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43340/42888.pdf
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A note on the seasonally shifting zone of high primary production in the Bay of Marajó, Pará, Brazil, 1983-1984 Acta Botanica
Schwassmann,H.O; Barthem,R.B; Carvalho,M.L.
To understand the hydrological and limnological conditions during the annual regime of high and low river flow, as well as the action of the tides, a series of 18 collecting trips were conducted in monthly and bimonthly intervals across the Bay of Marajó during the years 1983-1985. The Tocantins River provides more than 80% of the inflow into this bay and shows a much greater difference in water volume flow between high and low water season than the Amazon. The annual displacement of brackish water influence is thus more extensive Marajó Bay than in the Amazon estuary. During the dry season of low river discharge (September-December), traces of seawater are found to penetrate up to 90 km upriver in the Guamá River. The high degree of turbidity of inner...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Limnology; Amazon Estuary; Tidal Rivers; Estuary Hydrodynamics; Phytoplankton.
Ano: 1988 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061988000300014
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A single bio-energetics growth and reproduction model for the oyster Crassostrea gigas in six Atlantic ecosystems ArchiMer
Alunno-bruscia, Marianne; Bourles, Yves; Maurer, Daniele; Robert, Stephane; Mazurie, Joseph; Gangnery, Aline; Goulletquer, Philippe; Pouvreau, Stephane.
Many studies based on bioenergetics growth models have investigated the effects of environmental factors on oyster (Crassostrea gigas) growth and physiology. However, most of these models are site-specific and cannot be applied to other culture sites without the re-estimation of parameters or re-formulation of some processes. We aimed to develop a generic growth model suitable for application in contrasting environments, with a constant set of parameters. We tested the oyster-DEB model (Bourlès et al. 2009) for the stimulation of C. gigas growth in different cohorts (spats and adults) at major shellfish culture sites in France, in several years: Arcachon (1993–1994); Marennes-Oléron (2007); Quiberon (1999, 2000, 2001); Rade de Brest (2008); Baie du...
Tipo: Text Palavras-chave: DEB theory; Modelling; Bivalves; Crassostrea gigas; Phytoplankton; Temperature effect; Coastal environment..
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15403/12762.pdf
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A spatially explicit ecosystem model of seston depletion in dense mussel culture ArchiMer
Grant, J; Bacher, Cedric; Cranford, P; Guyondet, T; Carreau, M.
A fully-coupled biological-physical-chemical model of a coastal ecosystem was constructed to examine the impact of suspended mussel culture on phytoplankton biomass in Tracadie Bay, Prince Edward Island, Canada. Due to the extent of mussel culture there, we hypothesised that shellfish filtration would control the concentration and distribution of phytoplankton and other suspended particles in the bay. Circulation was delineated with a tidally-driven 2D numerical model and used to drive an ecosystem model with a focus on pelagic components including phytoplankton production, nutrients, detritus, and mussels. The benthos were treated as a sink. Nutrients and seston were forced by tidal exchange and river input, with phytoplankton additionally forced by...
Tipo: Text Palavras-chave: Towed sensors; Nutrient dynamics; Circulation model; Phytoplankton; Carrying capacity; Shellfish aquaculture; Estuaries; Ecosystem model.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6951.pdf
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Abondance et composition du phytoplancton sur les lagunes méditerranéennes oligo et mésohalines ArchiMer
Derolez, Valerie; Bec, Béatrice; Grillas, Patrice; Sanchez, Ana Elena; Raimbault, Patrick.
In the context of WFD implementation on Mediterranean lagoons, work has been carried out since 2010 by Ifremer, Tour du Valat and IRSTEA (Onema and AERM & C fundings), to assess the relevance of macrophytes and macrofauna indicators for oligohaline and mesohaline lagoons (mean salinity <18 PSU). The question of the relevance of indicator metrics and thresholds for the "phytoplankton" biological quality element also arises, especially due to the confined nature of olgo-mesohaline lagoons. The objective of this study is to characterize the abundance and composition of phytoplankton on 5 oligo and mesohaline lagoons of the French Mediterranean coast (Scamandre, Crey, Charnier, Bolmon and Grand Palun). Analyses of accessory pigments (chlorophyll and...
Tipo: Text Palavras-chave: Lagunes; Méditerranée; Oligohalin; Mésohalin; Phytoplancton; Cytométrie; Pigments chlorophylliens; Lagoons; Mediterranean Sea; Oligohaline; Mesohaline; Phytoplankton; Cytometry; Chlorophyll pigments..
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00357/46816/46682.pdf
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Abundancia y distribución del ictioplancton, fito y zooplancton en el mar ecuatoriano en abril de 1995 OceanDocs
Luzuriaga de Cruz, M.; Elías, E.; Flores, M.E..
El presente trabajo trata de la distribución de la abundancia de huevos y larvas de peces en relación con la abundancia del zooplancton y fitoplancton colectado en 13 estaciones muestreadas a bordo del B/I TOHALLI durante el crucero pelágico-oceanográfico realizado en abril de 1995. Se analizó un total de 12820 huevos de peces. (10m²)¹ y 5145 larvas de peces (10m²)¹. La mayor abundancia de huevos y larvas de peces se localizó al este de las Islas Galápagos, en las estaciones 1P y 10, situadas en los extremos norte y sur del área de muestreo a la altura de la Isla San Cristóbal, con 5226 huevos (10m²)¹ y 1042 larvas (10m²)¹, respectivamente, mientras que la menor abundancia se localizó también al este de la Islas Galápagos, en las estaciones 7 y 5 con 109...
Tipo: Journal Contribution Palavras-chave: Abundance; Ichthyoplankton; Phytoplankton; Zooplankton; Cruises; Fish eggs; Fish larvae; Phytoplankton; Zooplankton; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 1998 URL: http://hdl.handle.net/1834/2278
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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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Addressing the measurement of particulate organic and inorganic phosphorus in estuarine and coastal waters ArchiMer
Labry, Claire; Youenou, Agnes; Delmas, Daniel; Michelon, Pascale.
The speciation of particulate phosphorus (TPP) into inorganic (PIP) and organic phosphorus (POP), has been scarcely investigated in suspended particulate matter (SPM), contrary to numerous sediment studies. This work evaluates the actual capacity of methods for TPP, POP and PIP determination in SPM to measure efficiently and specifically each pool. Methods were tested on a range of plankton-associated organic and inorganic P compounds, on microalgal cultures and estuarine samples. Then results are specifically discussed reviewing P speciation in phytoplankton. For TPP analysis, the method of Solorzano and Sharp (1980) is recommended compared with that of Aspila et al. (1976), originally dedicated to sediment, as there is one step less, the protocol is more...
Tipo: Text Palavras-chave: Phosphorus; Speciation; Waters; Phytoplankton; HTC; CWO.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00149/26046/26385.pdf
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Algal toxin profiles in Nigerian coastal waters (Gulf of Guinea) using passive sampling and liquid chromatography coupled to mass spectrometry ArchiMer
Zendong, Suzie Zita; Kadiri, Medina; Herrenknecht, Christine; Nezan, Elisabeth; Mazzeo, Antonia; Hess, Philipp.
Algal toxins may accumulate in fish and shellfish and thus cause poisoning in consumers of seafood. Such toxins and the algae producing them are regularly surveyed in many countries, including Europe, North America, Japan and others. However, very little is known regards the occurrence of such algae and their toxins in most African countries. This paper reports on a survey of phytoplankton and algal toxins in Nigerian coastal waters. Seawater samples were obtained from four sites for phytoplankton identification, on three occasions between the middle of October 2014 and the end of February 2015 (Bar Beach and Lekki in Lagos State, Port Harcourt in Rivers State and Uyo in Akwa Ibom State). The phytoplankton community was generally dominated by diatoms and...
Tipo: Text Palavras-chave: Dinoflagellates; Dinophysis; Phycotoxins; Untargeted analysis; Phytoplankton.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00314/42521/41893.pdf
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Algunas características del florecimiento del fitoplancton en el frente del Río de la Plata. I. Los sistemas nutritivos OceanDocs
Negri, R.M.; Carreto, J.I.; Benavides, H.R..
During the spring (H-04/82: october 11-27, 1982)carried out by the Fishery Research Vessel "Dr.E.Holmberg", the distribution of temperature, salinity, nutrients concentration and photosynthetic pigments were studied at the "Rio de la Plata" maritime front. The presence of Sub-Tropical coastal waters in only station did not allow its characterization. Low Chlorophyll a concentration were noted, in association with scarce concentrations of nutrients and high Margalef index values.
Tipo: Journal Contribution Palavras-chave: Phytoplankton; Abiotic factors; Water masses; Phosphates; Silicates; Nitrates; Chlorophylls; Estuarine front; Phytoplankton; Nitrates; Nutrients; Phosphates; Silicates; Chlorophylls.
Ano: 1986 URL: http://hdl.handle.net/1834/2041
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Amélioration des productions phytoplanctoniques en écloserie de mollusques : caractérisation des microalgues fourrage ArchiMer
Robert, Rene; Chretiennot-dinet, Marie-josèphe; Kaas, Raymond; Martin-jezequel, Véronique; Moal, Jeanne; Le Coz, Jean-rene; Nicolas, Jean-louis; Bernard, Eudes; Connan, Jean-paul; Le Dean, Loic; Le Gourrierec, Gaetane; Leroy, Bertrand; Quere, Claudie.
in mollusc hatcheries. Consequently, we assessed themost commonly used species to establish their growth and size profiles, their cytomorphological, biochemical, biomolecular identification as well as their cytometer signs, and also their ability to grow under extreme conditions of temperature and salinity. This work aimed at matching the conformity of the strains used in Argenton (dispatched to most of the French commercial hatcheries) to those of a referenced culture collection. A previous screening preceded this study, because of the 45 species and/or clones held originally, Argenton kept no more than 15 species. As most of the latter are also represented in referenced collection, our strains are therefore correctly identified. On the other hand, the...
Tipo: Text Palavras-chave: Ecological limits; Biomolecular profile; Flow cytometry; Biochemical composition; Cytomorphology; Phytoplankton; Mollusc; Hatchery; Ecotolérance; Profil biomoléculaire; Cytométrie en flux; Composition biochimique; Cytomorphologie; Phytoplancton; Mollusques; Ecloserie.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-1546.pdf
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Análisis comparativo del estado trófico de las aguas en la costa oriental de la provincia de Cienfuegos, Cuba. OceanDocs
Seisdedo, M.; Moreira, A.; Arencibia, G.; Pérez, I..
El propósito de este trabajo es evaluar el estado trófico de las aguas en la costa oriental de la provincia de Cienfuegos, a partir de las concentraciones de nutrientes y del fitoplancton. Se utilizaron dos métodos de evaluación del estado trófico y se consideraron los resultados de nitrógeno inorgánico (NI), fósforo inorgánico (FI), Si y fitoplancton, los cuales se obtuvieron durante cuatro campañas de muestreo llevadas a cabo en el período 2006-2007. Se analizó la proporción elemental disponible Si/NI según criterio de Redfield, así como también se obtuvieron los coeficientes de correlaciones entre las concentraciones de nutrientes y fitoplancton. Los resultados mostraron al Si como el nutriente más disponible en el área de estudio y a las...
Tipo: Journal Contribution Palavras-chave: Trophic status; Nutrients (mineral); Phytoplankton; Coastal zone.
Ano: 2010 URL: http://hdl.handle.net/1834/4529
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Analyse de la variabilité spatio-temporelle des populations phytoplanctoniques observées dans le réseau national de surveillance du phytoplancton dans le golfe de Gabés OceanDocs
Feki-Sahnoun, W..
Le long des côtes du golfe de Gabès, les données collectées dans le cadre du Réseau de Surveillance du Phytoplancton et des Phycotoxines (REPHY), constituent une base pertinente pour examiner la structure et la dynamique des communautés phytoplanctoniques à grandes échelles temporelle (1997-2007) et géographique (l’ensemble de littoral du golfe). S’appuyant sur les données du REPHY, l’objectif de cette étude était de décrire les principales formes de variabilité des communautés phytoplanctoniques observées sur nos côtes. Les schémas de la variabilité des populations phytoplanctoniques ont été examinés à différentes échelles temporelles et géographiques à l’aide de méthodes statistiques multivariées. Dans un premier temps, l’analyse de la dynamique des...
Tipo: Theses and Dissertations Palavras-chave: Phytoplankton; Temporal variations; Geographical distribution; Statistical analysis; Models.
Ano: 2013 URL: http://hdl.handle.net/1834/5444
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Application of a digital pattern recognition system to Dinophysis acuminata and D-sacculus complexes ArchiMer
Truquet, Philippe; Lassus, Patrick; Honsell, Giorgio; Le Dean, Loic.
An image discrimination technique was developed to improve specific identification of some toxic Dinophysis cells (marine dinoflagellates involved in diarrhoeic shellfish poisoning), especially the ''acuminata'' and ''sacculus'' groups, which can be present at different ratios in natural sea-water samples collected during toxic episodes. This work was performed with image analysis software SAMBA (TITN Alcatel) using preserved cells directly observed through an inverted microscope and recorded with a video camera before further processing. All morphometric parameters used for discrimination of 7 different species or morphotypes of Dinophysis were tested with discriminant analysis. This study indicates that Dinophysis sp. and D. pavillardi seem well...
Tipo: Text Palavras-chave: Dinophysis sp.; Analyse d'image; Taxonomie; Phytoplancton; Dinophysis sp; Image analysis; Taxonomy; Phytoplankton.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00188/29890/28337.pdf
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Application of an Ocean Color Algal Taxa Detection Model to Red Tides in the Southern Benguela OceanDocs
Etheridge, S.M.; Roesler, C.S.; Pitcher, G.C..
A forward reflectance model is used to demonstrate the sensitivity of hyperspectral ocean color observations to phytoplankton biomass, species composition and cell size. An inverse ocean color model is developed which has explicit terms for 5 taxonomic groups of phytoplankton. The model expresses the contributions of each group in terms of the magnitude of the absorption coefficient, which is proportional to biomass. The model is applied to a time series of reflectance data from an expansive red tide off the west coast of South Africa. The results compare favorably with those derived from microscopic cell counts. This demonstrates the utility of in situ ocean color detection of the composition and concentration of potentially harmful algae.
Tipo: Report Palavras-chave: Algae; Plankton studies; Phytoplankton; Colorimetric techniques.
Ano: 2000 URL: http://hdl.handle.net/1834/826
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Aspectos ecológicos del plancton en las riberas del humedal Isla Santay, Río Guayas durante los años 2000 y 2002 OceanDocs
Tapia, M.E.; Naranjo, Ch..
El objetivo del presente estudio es conocer la distribución cualitativa y cuantitativa de las especies del fitoplancton, zooplancton e ictioplancton y su relación con las condiciones ambientales durante el período en estudio.
Tipo: Journal Contribution Palavras-chave: Species diversity; Plankton; Phytoplankton; Zooplankton; Ichthyoplankton; Biomass; Abundance; Biological production; Marine ecology; Temporal variations; Plankton; Phytoplankton; Zooplankton; Biomass; Biological production; Species diversity; Marine ecology; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_33954; Http://aims.fao.org/aos/agrovoc/c_4609.
Ano: 2007 URL: http://hdl.handle.net/1834/2371
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Assessing phytoplankton realized niches using a French National Phytoplankton Monitoring Network ArchiMer
Farinas, Tania Hernandez; Bacher, Cedric; Soudant, Dominique; Belin, Catherine; Barille, Laurent.
Relating environmental factors to species occurrence is a fundamental step in a better understanding of the community structure, the spatial and temporal dynamics of populations and how species may respond to environmental changes. In this paper, we used phytoplankton occurrence data, from a French national phytoplankton monitoring network, and environmental variables with the aim of characterizing the realized ecological niches of phytoplankton groups. We selected 35 phytoplankton taxa representing the most important taxa in terms of occurrence frequency and abundance along the French coast of the eastern English Channel, the Southern Bight of the North Sea and the Atlantic Ocean. We show that environmental variables such as nutrient concentration, water...
Tipo: Text Palavras-chave: Phytoplankton; Environment; Niche position; Tolerance; Kernel density; Outlying mean index.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00255/36627/35263.pdf
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Assessing spatial and temporal variability of phytoplankton communities' composition in the Iroise Sea ecosystem (Brittany, France): A 3D modeling approach. Part 1: Biophysical control over plankton functional types succession and distribution ArchiMer
Cadier, Mathilde; Gorgues, Thomas; Sourisseau, Marc; Edwards, Christopher A.; Aumont, Olivier; Marie, Louis; Memery, Laurent.
Understanding the dynamic interplay between physical, biogeochemical and biological processes represents a key challenge in oceanography, particularly in shelf seas where complex hydrodynamics are likely to drive nutrient distribution and niche partitioning of phytoplankton communities. The Iroise Sea includes a tidal front called the ‘Ushant Front’ that undergoes a pronounced seasonal cycle, with a marked signal during the summer. These characteristics as well as relatively good observational sampling make it a region of choice to study processes impacting phytoplankton dynamics. This innovative modeling study employs a phytoplankton-diversity model, coupled to a regional circulation model to explore mechanisms that alter biogeography of phytoplankton in...
Tipo: Text Palavras-chave: Iroise Sea; Tidal mixing front; Biogeochemical modeling; Phytoplankton; Functional groups; Seasonal cycle.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00352/46367/45986.pdf
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