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The problems of application of radiocarbon method for estimation of primary production in oligotrophic waters ArchiMer
Krupatkina, D; Berland, B; Maestrini, S.
The errors in primary production estimation by the radiocarbon method may differ from one trophic region to another. Such supposition is based on unequal phytoplanktonic structural characteristics of these regions. These errors are likely to appear rather significant in oligotrophic waters predominated by nano- and ultranano-plankton (the so-called picoplankton). The organic substance of oligotrophic waters is obviously produced by picoplankton for the most part, the need for clarifying possible errors when estimating primary production by the radiocarbon method, which is the purpose of the present work is urgent. For these topics in oligotrophic waters, measurements were carried out in two ways: (1) according to the generally accepted pattern (Sorokin,...
Tipo: Text Palavras-chave: Methodology; Community composition; Nutrient cycles; Phytoplankton; Ecosystems; Carbon 14; Primary production; Analytical techniques.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1522.pdf
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The Seasonal and Inter-Annual Fluctuations of Plankton Abundance and Community Structure in a North Atlantic Marine Protected Area ArchiMer
Benedetti, Fabio; Jalabert, Laëtitia; Sourisseau, Marc; Becker, Beatriz; Cailliau, Caroline; Desnos, Corinne; Elineau, Amanda; Irisson, Jean-olivier; Lombard, Fabien; Picheral, Marc; Stemmann, Lars; Pouline, Patrick.
Marine Protected Areas have become a major tool for the conservation of marine biodiversity and resources. Yet our understanding of their efficacy is often limited because it is measured for a few biological components, typically top predators or species of commercial interest. To achieve conservation targets, marine protected areas can benefit from ecosystem-based approaches. Within such an approach, documenting the variation of plankton indicators and their covariation with climate is crucial as plankton represent the base of the food webs. With this perspective, we sought to document the variations in the emerging properties of the plankton to better understand the dynamics of the pelagic fishes, mammals and seabirds that inhabit the region. For the...
Tipo: Text Palavras-chave: Iroise Sea; Plankton; MPA; Temporal variability; Community composition; Size structure.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00490/60213/63561.pdf
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Variabilite mensuelle du zooplancton et de l'ichtyoplancton dans le golfe de Tunis OceanDocs
Missaoui, H.; El Abed, A.; M'rabet, R.; Romdhane, M.S.; Zarrad, R.; Jarboui, O..
Monthly variability of zooplankton and ichthyoplankton abundance and composition were studied in 6 stations in the Gulf of Tunis between February 2003 and January 2004. Plankton trawls were horizontal, in surface and at night. Study area seems to be influenced by climatic conditions and the outflow of Majreda River that affect the surface temperature and salinity. Copepods, with many abundance peaks in the year, formed the most abundant group (84%) followed by cladocerans (8%) and chaetognaths (3%). The appendicularians, cladocerans and medusae had swarms in the summer, the creseis and the chaetognths in the autun and the zoae larvae in the spring. The highest fish spawning periods was in summer then the highest larva abundance was in winter and...
Tipo: Journal Contribution Palavras-chave: Community composition; Fish larvae; Ichthyoplankton; Temporal variations; Zooplankton; Zooplankton; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 2004 URL: http://hdl.handle.net/1834/4242
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Variación estacional del zooplancton en el sector estuarial de la laguna Mar Chiquita. Su relación con algunas variables ambientales. OceanDocs
Firpo, C..
El zooplancton de lagunas costeras se caracteriza por su baja diversidad y la dominancia de algunas especies que toleran sus condiciones ambientales cambiantes. La laguna costera Mar Chiquita está ubicada a los 37º32'S - 37º45’S y 57º19’-57º26’ W, posee un cuerpo lagunar de escasa profundidad y un canal por el cual se conecta con el mar, que posee características estuariales. Dada la escasa información referida al zooplancton de esta laguna el presente trabajo tiene como objetivo describir la taxocenosis del zooplancton, las variaciones estacionales de la abundancia y diversidad y la relación de dichas variaciones con la salinidad y temperatura, para dos estaciones ubicadas en el sector estuarial. Los muestreos mensuales se realizaron en dos estaciones...
Tipo: Theses and Dissertations Palavras-chave: Zooplankton; Seasonal variations; Environmental conditions; Abundance; Community composition; Brackishwater environment; Coastal lagoons; Zooplankton; Environmental conditions; Coastal lagoons.
Ano: 2002 URL: http://hdl.handle.net/1834/3911
Registros recuperados: 44
Primeira ... 123 ... Última
 

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