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| Registros recuperados: 369 | |
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| 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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| Hernandez Farinas, Tania; 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: https://archimer.ifremer.fr/doc/00255/36627/35263.pdf |
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| 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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| Mudie, Peta J.; Marret, Fabienne; Mertens, Kenneth; Shumilovskikh, Lyudmila; Leroy, Suzanne A. G.. |
| We present the first comprehensive taxonomic and environmental study of dinoflagellate cysts in 185 surface sediment samples from the Black Sea Corridor (BSC) which is a series of marine basins extending from the Aegean to the Aral Seas (including Marmara, Black, Azov and Caspian Seas). For decades, these low-salinity, semi-enclosed or endorheic basins have experienced large-scale changes because of intensive agriculture and industrialisation, with consequent eutrophication and increased algal blooms. The BSC atlas data provide a baseline for improved understanding of linkages between surface water conditions and dinoflagellate cyst (dinocyst) distribution, diversity and morphological variations. By cross-reference to dinocyst occurrences in sediment cores... |
| Tipo: Text |
Palavras-chave: Phytoplankton; Harmful algae; Biodiversity; Paleoceanography; Surface samples. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00387/49824/50408.pdf |
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| Michel, Pierre; Boutier, Bernard; Herbland, Alain; Averty, Bernard; Artigas, Lf; Auger, Dominique; Chartier, E. |
| The arsenic (As) cycle in the marine environment is known to be sensitive to biological activity. Within the scope of the National Coastal Oceanography Program, we undertook a specific study of the behaviour of this element in a water column on the continental shelf of the Bay of Biscay off the Gironde estuary during two oceanographic cruises conducted in May 1994 and May 1995. Various chemical forms were measured: arsenite (As3), at-senate (As5), monomethylarsenic (MMA), dimethylarsenic (DMA) and dissolved total As after ultraviolet mineralization. The net flux of total As from the Gironde estuary was evaluated as well as its effect on the concentration in surface marine waters. The vertical profiles in the coastal zone during a period of active primary... |
| Tipo: Text |
Palavras-chave: Arsenic; Phytoplankton; Speciation; Gironde plume; Biscay Bay. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/1998/publication-851.pdf |
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| Guillaud, Jean-francois; Andrieux-loyer, Francoise; Menesguen, Alain. |
| As part of the French National Programme for Coastal Oceanography, this paper focuses on improvement of biogeochemical modelling in the: Bay of Seine (Eastern Channel), by introducing phosphorus in nutrient cycles. The Bay of Seine receives the Seine river, which exhibits very high nutrient concentrations, and this coastal zone constitutes a typical case of eutrophication in a river plume area. In terms of analyses, sequential extraction and analysis of sedimentary phosphorus were used in order, to measure various forms of particulate phosphorus in suspended matter and sediment (calcium-bound phosphate, Fe/Al-bound phosphate, exchangeable phosphate and organic phosphorus). In the modelling approach, the Bay is divided into 42 boxes and a two-layer,... |
| Tipo: Text |
Palavras-chave: Bay of Seine; Phytoplankton; Phosphorus; River plume; Biological two layer box model. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-462.pdf |
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| Villanueva Sanhueza, F.A.. |
| Actualmente la intensidad, duración y cobertura geográfica de las FAN producidas por la especie Alexandrium catenella (Whedon & Kofoid, Balech 1985), en el sur de Chile han aumentado desde 1972 hasta 2005, extendiéndose desde la XII Región hasta la X Región. De una estación fija ubicada en la XI Región, denominada “Nueva Hammerfest”, se analizó una serie de tiempo desde 1993 a 2005, con el fin de determinar si la presencia de A. catenella está relacionada con eventos tóxicos de esta especie observados en la zona austral de Chile. El análisis se basó en el recuento de células de muestras de red, estimación de Índices de Abundancia Relativa y relaciones de dependencia de la especie con registros de temperatura del agua. Se recolectaron 537 muestras de... |
| Tipo: Theses and Dissertations |
Palavras-chave: Biogeography; Phytoplankton; Red tides. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/4917 |
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| Torres, G.; Calderón, T.; Calderón, G.; Franco, V.; Correa, C.. |
| El objetivo de la presente investigación, fue dar un comprensivo entendimiento de las condiciones bio-oceanográficas del fitoplancton-zooplancton-ictioplancton, y las interacciones con el medio circundante (físico, químico), procesos que son complicados cuando involucran aspectos hidrográficos costeros como áreas de afloramiento, áreas de pesca y áreas de soporte alimentario para los diferentes recursos marinos costeros planctónicos-bentónicos y aves-mamíferos marinos. |
| Tipo: Journal Contribution |
Palavras-chave: Marine ecology; Phytoplankton; Zooplankton; Ichthyoplankton; Upwelling; Biological production; Marine resources; Cruises; Oceanic islands; Coastal zone; Marine resources; Phytoplankton; Zooplankton; Biological production; Marine ecology; Http://aims.fao.org/aos/agrovoc/c_28012; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_4609. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/2318 |
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| Idrisi, N.; Romanou, A.; Olascoaga, M.J.. |
| A Nutrients-Phytoplankton-Zooplankton-Detritus (NPZD) ecosystem model is coupled to the Miami Isopycnic-Coordinate Ocean Model (MICOM) to study planktondynamics in the Arabian Sea. Experiments oriented to testing the NPZD-MICOM coupled model sensitivity to variations in several parameters are performed. Particular attention is paid to the rates of detritus sinking and maximum phytoplankton growth rate. The coarse features of the blooms are captured by all the experiments considered, and agree with earlier models for the biological activity of the region. Intensity, duration, and peaks of the blooms are found to be quite sensitive to the parameter choices. The existence of an offshore deep chlorophyll maximum in the model is found to be closely related to... |
| Tipo: Journal Contribution |
Palavras-chave: Phytoplankton; Zooplankton; Detritus; Biophysics; Modelling; Arabian Sea; Http://aims.fao.org/aos/agrovoc/c_565. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/271 |
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| Martínez Canals, M.; Montalvo, J.F.; Miravet, M.E.; Lugioyo, M.; Loza, S.; Pérez, R.; García, I.; Rodríguez, A.; Cesar, M.E.; Esponda, S.; Sánchez, M.; Delgado, V.. |
| The anthropogenic affectation was evaluated on the coast N of the Gulf of Batabanó in May 2003 (corresponding to the provinces of Matanzas and Havana), in areas located in the line of the coast. The results were compared with the historical information of the sector. In the coast N and the Ensenada of the Broa, the parameters oxygen saturation, DBO5 and DQO showed characteristic high values of eutrofication. The biggest contribution in the Cianoficies was in the near coastal areas to sources of organic contamination. In the case of the nutrients they show specific data of mesothrofic waters with tendency to the eutrofization and the silts presented a high affectation for toxic metals. The area near to Guanímar is distinguished to present conditions of... |
| Tipo: Proceedings Paper |
Palavras-chave: Phytoplankton; Water quality; Primary production; Chemistry; Environmental monitoring; Phytoplankton; Water quality; Primary production; Chemistry; Environmental monitoring; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_1522; Http://aims.fao.org/aos/agrovoc/c_37876. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/2172 |
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| Bejaoui, B.; Ben Charada, R.; Moussa, M.; Ben Hamadou, R.; Harzallah, A.; Chapelle, A.. |
| Ce travail porte sur la caractérisation hivernale de la lagune de Bizerte en se basant sur une campagne de mesures effectuée en janvier 2004. Cette campagne a porté sur 17 stations réparties sur toute la lagune ainsi qu’une station marine de référence. Chaque échantillon a fait l’objet de mesures in-situ (Température, Salinité, Conductivité, Transparence, Acidité et Oxygène dissous) et des analyses au laboratoire (NO3, NO2, NT, PO4, Chlorophylle-a, Phéopigment et MES). Cette étude a montré que la distribution spatiale des paramètres est fortement liée aux apports fluviaux. Contrairement au phosphore minéral, la teneur en azote total montre une variation spatiale importante. L’analyse de la distribution spatiale des nutriments d’une part et de la... |
| Tipo: Journal Contribution |
Palavras-chave: Geographical distribution; Hydrobiology; Nitrogen; Nutrients (mineral); Phosphorus; Phytoplankton; Geographical distribution; Nitrogen; Phosphorus; Phytoplankton; Hydrobiology; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_3718. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/3748 |
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| Registros recuperados: 369 | |
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