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Registros recuperados: 75
Primeira ... 1234 ... Última
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A review on macrobenthic trophic relationships along subtropical sandy shores in southernmost Brazil Biota Neotropica
Pinotti,Raphael Mathias; Minasi,Diogo Marroni; Colling,Leonir André; Bemvenuti,Carlos Emílio.
Main trophic relationships that occur along the exposed sandy shores in southernmost Brazil (∼33° S) are established taking into account several biological compartments operating at morphodynamically distinct environments. Beaches are predominantly of the intermediate type but some stretches of coastline are truly dissipative (Cassino Beach) or tending-to-reflective (Concheiros Beach), presenting thus diverse biological compartments and inhabitant macrobenthic assemblages. Dense concentrations of the surf-zone diatom Asterionellopsis glacialis are responsible - at least for the intermediate shorelines - for the most year-round primary production, sustaining several consumers up to tertiary level. Among them, bivalves Amarilladesma mactroides, Donax...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Exposed beach; Intermediate states; Primary production; Secondary consumers; Conservation.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032014000300401
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Alimentation et croissance de bivalves filtreurs en bassin aménagé ArchiMer
Riva, A.; Lelong, P..
The lagoon of Brusc located on the Mediterranean coast (Var­France) is subjected to climatic and hydrologic particular condi­tions. The low values observed for nutrient into the sea water affect the evolution of phytoplankton. Thus chlorophyll concen­tration measured in the lagoon give an annual average of 0.42 mg. m-3 . The growth of two bivalves species : Cerastoderma glaucum and Venerupis semidecussata was compared between two stations where one population of each species are implanted. The culture of this molluscs is made in the lagoon and in outdoor pound dug on the old salt-pan near at hand. In the pound, subjected to natural climatic conditions, a great growth is noted for this two species. The growth rate appear better than the populations of the...
Tipo: Text Palavras-chave: Lagune méditerranéenne; Production primaire; Bivalves; Croissance; Mediterranean Lagoon; Primary production; Bivalves; Growth.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00306/41674/40883.pdf
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Atmospherically-promoted photosynthetic activity in a well-mixed ecosystem: Significance of wet deposition events of nitrogen compounds ArchiMer
Boulart, C; Flament, Pierre; Gentilhomme, V; Deboudt, K; Migon, C; Lizon, F; Schapira, M; Lefebvre, Alain.
Wet atmospheric deposition of dissolved N, P and Si species is studied in well-mixed coastal ecosystem to evaluate its potential to stimulate photosynthetic activities in nutrient-depleted conditions. Our results show that, during spring, seawater is greatly depleted in major nutrients: Dissolved Inorganic Nitrogen (DIN), Dissolved Inorganic Phosphorus (DIP) and Silicic acid (Si), in parallel with an increase of phytoplanktonic biomass. In spring (March-May) and summer (June-September), wet atmospheric deposition is the predominant source (> 60%, relative to riverine contribution) for nitrates and ammonium inputs to this N-limited coastal ecosystem. During winter (October-February), riverine inputs of DIN predominate (> 80%) and are annually the most...
Tipo: Text Palavras-chave: Strait of Dover; Nutrient cycles; River plumes; Atmospheric deposition; Coastal zone; Primary production.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2007.pdf
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Autoradiography as a tool in primary production research OMA
Mommaerts, J.-P..
Autoradiography of C-14 labelled phytoplankton collected onto a millipore filter allows the determination of the number of photosynthetically active cells in a water sample and thus gives useful information on the standing crop in primary production studies.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Autoradiography; Methods; Primary production.
Ano: 1972 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3462
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Bacterioplankton and phytoplankton production in seven lakes in the Middle Rio Doce basin, south-east Brazil. Repositório Alice
PETRUCIO, M. M.; BARBOSA, F. A. R.; FURTADO, A. L. dos S..
The purpose of this study was to measure the phytoplankton production (PP) and bacterial production (BP) simultaneously in seven lakes in the middle Rio Doce basin (southeast Brazil) during the dry and the rainy seasons. Limnological monitoring was conducted from 1999 to 2001 as well as both PP (radioactive carbon fixation) and BP (3H-Leucine incorporation) in four specific depths (100%, 10%, 1% of incident radiation, and aphotic zone). Furthermore, trophic state of the lakes was analyzed, considering the index proposed by Salas and Martino (1991) and Carlson (1977). In general, some parameters increased during the rainy season such as pH, conductivity, chlorophyll and total nitrogen. In the period of 1999/2000, the rain caused PP reduction in the lakes,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Lakes; Trophic state; Phytoplankton; Bacterioplankton; Primary production; Bacterial secondary production.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1009158
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Biomass changes and trophic amplification of plankton in a warmer ocean ArchiMer
Chust, Guillem; Allen, J. Icarus; Bopp, Laurent; Schrum, Corinna; Holt, Jason; Tsiaras, Kostas; Zavatarelli, Marco; Chifflet, Marina; Cannaby, Heather; Dadou, Isabelle; Daewel, Ute; Wakelin, Sarah L.; Machu, Eric; Pushpadas, Dhanya; Butenschon, Momme; Artioli, Yuri; Petihakis, Georges; Smith, Chris; Garcon, Veronique; Goubanova, Katerina; Le Vu, Briac; Fach, Bettina A.; Salihoglu, Baris; Clementi, Emanuela; Irigoien, Xabier.
Ocean warming can modify the ecophysiology and distribution of marine organisms, and relationships between species, with nonlinear interactions between ecosystem components potentially resulting in trophic amplification. Trophic amplification (or attenuation) describe the propagation of a hydroclimatic signal up the food web, causing magnification (or depression) of biomass values along one or more trophic pathways. We have employed 3-D coupled physical-biogeochemical models to explore ecosystem responses to climate change with a focus on trophic amplification. The response of phytoplankton and zooplankton to global climate-change projections, carried out with the IPSL Earth System Model by the end of the century, is analysed at global and regional basis,...
Tipo: Text Palavras-chave: Ecosystem model; Food web; Plankton; Primary production; Sea warming; Trophic amplification.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00188/29966/28481.pdf
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Biomasse et production primaire du phytoplancton et du microphytobenthos de deux biotopes sableux (Golfe de Fos, France) ArchiMer
Plante-cuny, Marie-reine; Bodoy, Alain.
The primary production (phytoplankton and microphytobenthos) of a coastaL shallow water ecosystem (0.5 m) was investigated in two sandy areas, differing by their wave exposure. The physical and chemical parameters, the functional chlorophyll and pheopigments as well as the primary production were measured monthly, throughout a two-year study. The bivalve Ruditapes decussatus was the dominant species in the sheltered station (RD), whereas Donax trlmcu/us inhabited the other station (DT) which was exposed to the open-sea waves. Microphytic biomasses were determined after extracting chlorophyll a and pheopigments in 90% acetone. by spectrophotometric measurements before and after acidification. Gross hourly primary production was estimated by measuring the...
Tipo: Text Palavras-chave: Biomasse; Production primaire; Phytoplancton; Microphytobenthos; Mediterranee; Biomass; Primary production; Phytoplancton; Microphytobenthos; Mediterranean.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/publication-2870.pdf
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Calidad ambiental de la zona costera del Golfo de Batabanó, Cuba OceanDocs
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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Características oceanográficas frente a Ecuador (Crucero T94/12/06 P-O, diciembre de 1994) OceanDocs
Cuadra, T. de la.
In front of the ecuadorian coast, the subsuperficial thermic structure at the sea, was detected being warm during december 1994, as a result of the advection of high temperature water from the West Pacific to the East Pacific Ocean. This oceanographical condition appared different from those of december 1992, even when meteorological conditions seemed to be quite similar to those in 1992, even when meteorological conditions seemed to be quite similar to those in 1992. The appearance of certain ridgings that apparently are related to the botton shape would provoke an enrichment of disolved inorganical nutrients and therefore hight primary productivity. This in turn would imply that, in the sites redarded as ”bajos”, the potential fishery resources are...
Tipo: Journal Contribution Palavras-chave: Oceanographic data; Thermal structure; Meteorological data; Primary production; Primary production; Meteorological data; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_34149.
Ano: 1995 URL: http://hdl.handle.net/1834/3020
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Caracterización ecológica de la salina artificial Pozos colorados, Caribe colombiano OceanDocs
Mancera-P., J.E..
Un estudio ecológico de la salina marina Pozos Colorados se llevó a cabo entre enero y agosto de 1987. Si bien las dos estaciones de muestreo presentaron amplias diferencias entre si; en general la dinámica del ecosistema dependió aparentemente de la salinidad, la cual varió entre 75 y 341 °/oo; su incremento y la disminución del nivel de agua, al parecer generaron aumento de la temperatura y disminución del oxígeno disuelto, con rangos de 26,3 y 41 °C para la primera y O y 5,4 mg/l para el segundo. Aunque en promedio el pH fue neutro (7,5), este sistema reductor, caracterizado además por abundante materia orgánica, generó en ocasiones una ligera acidez (6,7). La producción primaria neta fue negativa en la mayoría de los casos, como resultado de una...
Tipo: Journal Contribution Palavras-chave: Salinity effects; Ecosystems; Temperature effects; Primary production; Population structure; Ecology; Ecosystems; Primary production; Population structure; Ecology; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_2467.
Ano: 1990 URL: http://hdl.handle.net/1834/3887
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Circulation effects on nitrogen dynamics in the Ionian Sea ArchiMer
Civitarese, G; Crise, A; Crispi, G; Mosetti, R.
In this work the description of the interaction between the general circulation and the nitrogen cycle in the Ionian Sea is considered. Firstly, an analysis is made of nitrate data collected during POEM-BC cruises in October 1991 and April 1992; then a numerical experiment based on a coupled hydrodynamic ecomodel is presented. The model results relative to the periods corresponding to the cruises are discussed. The ecomodel is climatological and represents an aggregated description of the nitrogen cycle in terms of inorganic nitrogen, phytoplankton and detritus. The numerical results as nitrogen distributions, fluxes and primary production are presented. A strong dependence of nitrogen distribution on circulation emerges both from the observational data...
Tipo: Text Palavras-chave: Ionian Sea; Nitrogen cycle; General circulation; Ecomodel; Primary production.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00096/20729/18366.pdf
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Comunidades del plancton en la Caleta Aeolian de la Isla Baltra - Galápagos (Ecuador), durante 2005 OceanDocs
Naranjo, Ch.; Tapia, M.E..
El propósito del trabajo es determinar la composición, abundancia de los grupos dominantes del fitoplancton y zooplancton, establecer las especies de Quetognatos y su relación con la temperatura superficial del mar durante marzo de 2005 correspondiente a la época húmeda.
Tipo: Journal Contribution Palavras-chave: Plankton; Primary production; Biological production; Phytoplankton; Zooplankton; Biomass; Abundance; Community composition; Fish eggs; Surface temperature; Plankton; Primary production; Biological production; Phytoplankton; Zooplankton; Biomass; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_926.
Ano: 2007 URL: http://hdl.handle.net/1834/2346
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Coupling physical and biogeochemical processes in the Rio de la Plata plume ArchiMer
Huret, Martin; Dadou, Isabelle; Dumas, Franck; Lazure, Pascal; Garcon, Véronique.
A coupled three-dimensional physical-biogeochemical model was developed in order to simulate the ecological functioning of the Rio de la Plata estuary and plume. The biogeochemical model reproduces the nitrogen cycle between five compartments: dissolved inorganic nitrogen, phytoplankton, zooplankton, detritus and dissolved organic nitrogen. The coupling is tested in seasonal climatological configurations and for the particular year 1999. The circulation is forced with Parana and Uruguay rivers discharges, NCEP wind and tide. The biogeochemical model includes loads of inorganic and organic nitrogen from both rivers. The model reproduces the correct tidal amplitudes in the estuary, as well as the most outstanding features of the observed horizontal and...
Tipo: Text Palavras-chave: Rio de la Plata; SeaWiFS; Primary production; Chlorophyll; River plumes; Biogeochemical modelling; Physical.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-334.pdf
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Current Contribution of Four Biotechnologies to New Zealand's Primary Sector AgEcon
Kaye-Blake, William; Saunders, Caroline M.; Emanuelsson, Martin.
Over the last several decades, changes to production technologies have significantly increased output from the primary sector. The contribution of improved genetics has been variously estimated, and the impacts of genetic engineering have received much attention. The present research estimated the economic impact of four modern biotechnologies (other than genetic engineering) on the primary sector. Information from interviews with key informants was incorporated into a cost-benefit analysis to estimate these impacts. The net contribution was estimated at $266 million per year, with impacts spread unevenly through the sector and across biotechnologies.
Tipo: Conference Paper or Presentation Palavras-chave: Biotechnology; Cost-benefit analysis; Marker assisted selection; New Zealand; Primary production; Research and Development/Tech Change/Emerging Technologies; O30; Q16.
Ano: 2006 URL: http://purl.umn.edu/25411
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Decadal variability in chlorophyll and primary production off NW Spain ArchiMer
Bode, Antonio; Anadón, Ricardo; Anxelu G. Morán, Xosé; Nogueira, Enrique; Teira, Eva; Varela, Manuel.
Long-term variability of phytoplankton biomass (chlorophyll a) and primary production (carbon fixation) in relation to changes in climatic and oceanographic factors was analysed for oceanic and shelf waters of the north and northwest Iberian Peninsula. Changes related to stratification in the water column and upwelling intensity were specifically addressed. The time series include measurements of primary production and biomass over 19 yr. Seasonally, the main mode of temporal variability of the series is the occurrence of phytoplankton blooms during the winter-spring and summer- autumn transition periods. On the northwestern coast (Galicia), the blooms are more frequent and attain higher biomass and production values than on the northern coast (Mar...
Tipo: Text Palavras-chave: Primary production; Upwelling; Climate change; Nutrients; Remineralisation; NE Atlantic.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00052/16356/13862.pdf
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Détection satellitaire et modélisation opérationnelle de la production végétale non-fixée dans la bande côtière bretonne ArchiMer
Penard, Cédric.
The negative impact of the man on the environment unquestionably increases. The coastal environment as a whole is the maritime environment which is the most exposed to man-made eutrophication. For instance, nitrate loads to coastal waters off Brittany (France) have increased 10 times (from 3 to s 30mg L-1NO3) during the four last decades. Eutrophication of this coastal zone is now a recurrent problem, more and more worrying. This eutrophication exhibits two main forms : " green tides ", which are caused by local proliferations and stranding of green macro-algae (particularly the Ulva species) in nitrogen-enriched areas ; phytoplanktonic blooms, which are responsible for coloured water events, toxic species can be present (Pseudo-Nitzschia, Alexandrium,...
Tipo: Text Palavras-chave: Bande côtière bretonne; Modèle couplé hydrodynamique-biogéochimie; Nutriments; Chlorophyllea; Production primaire; Eutrophisation; Modèle opérationnel; Pseudo-Nitzschia; French Brittany coastal shelf; Hydrodynamical biogeochemical coupled model; Nutrients; Chlorophyll-a; Primary production; Eutrophication; Operational model; Pseudo-Nitzschia.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00015/12603/9481.pdf
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Détermination des "bassins récepteurs" marins des principaux fleuves français de la façade Manche-Atlantique, et de leurs rôles respectifs dans l'eutrophisation phyto-planctonique des masses d'eau DCE et des sous-régions DCSMM. Phase 1 (2013) : Calcul de scénarios optimaux à partir des " bassins récepteurs". Phase 2 (2014) : Simulation de scénarios imposés et des scénarios optimaux ArchiMer
Menesguen, Alain; Dussauze, Morgan.
- This study (granted up to 50% by the French Office for Water and Aquatic Environments ONEMA) aimed at determining by modelling (hydrodynamical/biogeochemical ECOMARS3D model) the marine "receiving basins" of the main tributaries to the French waters of the English Channel and the Bay of Biscay. Knowing the respective part of each of these marine "receiving basins" in winter nutrient distribution, some optimal scenarios of nutrient loading reduction can be computed for nitrate or phosphate in order to bring back any marine water to the Good Ecological Status regarding eutrophication, at the best efficiency/cost ratio. - The study encompasses 45 watersheds (or clusters of neighboring watersheds) which have been retained because of their sizes and flow...
Tipo: Text Palavras-chave: Zone Manche-Atlantique; Modélisation 3D; Bassins versants; Bassins récepteurs marins; Nitrate; Phosphate; Réduction d'apports; Situation "pristine"; Production primaire; Oxygène dissous; Classement DCE; Bon Etat Ecologique; Optimisation linéaire; Simplexe; Optimisation quadratique; Méthode de Beale.; English Channel; Bay of Biscay; 3D modelling; Watersheds; Receiving basins; Nitrate; Phosphate; Nutrient loading reduction; Pristine situation; Primary production; Dissolved oxygen; WFD classification; Good Ecological Status; Linear optimisation; Simplexe method; Quadratic optimisation; Beale's method..
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00333/44422/44083.pdf
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Distribución de Clorofila-a frente a la costa ecuatoriana durante septiembre y diciembre de 1990 OceanDocs
Espinoza, J.; Maridueña, A.M..
Este trabajo describe la distribución tanto superficial como vertical de clorofila-a (Cl-a) durante los meses de septiembre y diciembre de 1990 y se discute la influencia de las condiciones oceanográficas sobre este pigmento fotosintético, como por ejemplo la presencia de una termoclima poco profunda, la posición del Frente Ecuatorial, así como la influencia de la escasez de precipitaciones pluviales sobre el estuario exterior del Golfo de Guayaquil. Todos estos factores favorecieron la presencia de valores estacionales relativamente altos de Cl-a exceptuando los valores bajos de la misma encontrados en el estuario exterior del Golfo de Guayaquil.
Tipo: Journal Contribution Palavras-chave: Chlorophylls; Primary production; Biomass; Horizontal distribution; Vertical distribution; Primary production; Biomass; Chlorophylls; Http://aims.fao.org/aos/agrovoc/c_34329; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_1577.
Ano: 1991 URL: http://hdl.handle.net/1834/3107
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Dynamic model of the short-term variability of microphytobenthic biomass on temperate intertidal mudflats ArchiMer
Guarini, Jean-marc; Blanchard, Gf; Gros, Philippe; Gouleau, Dominique; Bacher, Cedric.
In the present paper, we list and document the relevant behavioral and physiological processes controlling primary productivity of epipelic microalgae on intertidal mudflats in order to develop a simplified model. We first propose, in an attempt to characterize the 'photosynthetically active biomass' of the epipelic community, a new approach to describe the photic environment at the sediment surface, by substituting a discrete a-layer model in place of continuous vertical light distribution. This concept thus allows us to build a functional representation of the distribution of the photosynthetically active biomass in the sediment and, by then integrating the light and temperature forcing of the latter biomass, to predict the dynamics of the whole epipelic...
Tipo: Text Palavras-chave: Microphytobenthos; Intertidal mudflat; Primary production; Dynamic model; Migratory rhythm; Ecophysiological response.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00000/10540/7601.pdf
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Dynamics of phytoplankton diversity structure and primary productivity in the English Channel ArchiMer
Napoleon, Camille; Fiant, Liliane; Raimbault, Virginie; Riou, Philippe; Claquin, Pascal.
The dynamics of the phytoplankton assemblage, the physical, chemical and biological parameters, and primary productivity and production were monitored in the central English Channel along a transect between Ouistreham and Portsmouth from January to December 2010. The spatial patterns of the phytoplankton assemblage were controlled by the hydrological characteristics of the water masses, and the annual structure of the phytoplankton assemblage was characteristic of the central English Channel and was controlled by seasonality. The spring bloom was dominated by a single species, Chaetoceros socialis, and associated with low microphytoplankton evenness and Shannon-Wiener indices, whereas the evenness index was high from late spring to winter and associated...
Tipo: Text Palavras-chave: Phytoplankton diversity; Primary production; Productivity; English Channel.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00198/30964/29336.pdf
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