Consulta: creatorFacets:"Berland, B"
Registros recuperados: 5
Data/hora: 01/06/2024 15:48:58

Eau colorée à Lingulodinium polyedrum (Stein) Dodge, dans une zone aquacole du littoral du Doukkala (Atlantique marocain)
Provedor de dados: 5
Autores: Bennouna, A; Berland, B; El Attar, J; Assobhei, O.
A red tide of Lingulodinium polyedrum occured along the moroccan atlantic coast in july 1999. Observed in the beginning of the month in the Kenitra area, it spreads with the coastal drift as far as the south of safi, passing on its way upon a sanitary monitored area. This area which is submitted to an all year round bimonthly monitoring analysis of phytoplankton, contains significant natural beds of oysters, clams and mussels, as well as shellfish farms in Oualidia and Sidi Moussa lagoons. However, during this period of bloom, there was weekly monitoring of hydrologic and climatic data associated with phytoplankton analysis to identify the causes of this bloom. This bloom occured in 17-18degreesC surface waters, temperatures which are favourable to...
Tipo: Text
Palavras-chave: Eau colorée; Lingulodinum polyedrum; Toxicité; Maroc; Red tide; Lingulodinium polyedrum; Toxicity; Morocco.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43317/42937.pdf

Summer phytoplankton in the Levant Sea, biomass and limiting factors
Provedor de dados: 5
Autores: Berland, B; Burlakova, Z; Georgieva, L; Izmestieva, M; Kholodov, V; Krupatkina, D; Maestrini, S; Zaika, V.
Phytoplankton biomass has been studied in the Levant Sea (Eastern Mediterranean) during summer 1983 in order to picture its vertical distribution as well as its limitation mechanisms. Biological tests carried out on the natural populations of the Basin show that P is the first biomass-limiting element and that N is the second. The simultaneous input of P and N, however, is not sufficient to induce growth; this suggests that Mn has an essential role in the phytoplanktonic growth in this ultra-oligotrophic water. Discussion deals with the significance of the deep chlorophyll a maximum and with the physiological processes allowing it to last.
Tipo: Text
Palavras-chave: MED; Eastern Mediterranean Nitrogen Phosphorus Chlorophylls Biomass Temperature effects Nutrients (mineral) Vertical distribution Limiting factors Phytoplankton.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1519.pdf

Effects of petroleum biodegradation products on phytoplankton growth.
Provedor de dados: 5
Autores: Goutx, H; Berland, B; Leveau, M; Bertrand, J.
The effects of products resulting from petroleum biodegradation in continuous culture, have been studied on the growth of two marine algae. Sugars, lipids and amino acids are the main components resulting from petroleum degradation in the bacteria used medium. Their concentrations are respectively 600 mg.l super(-1), 46 mg.l super(-1) and 74.2 mu M.l super(-1). The algae growth is inhibited when products are enough concentrated; it is stimulated by low concentration. Among these products, lipids are more toxic than others. The two species show different sensitivity towards the used medium. Prorocentrum micans growth is more inhibited than that of Phaeodactylum tricornutum .
Tipo: Text
Palavras-chave: Bacteria; Phytoplankton; Toxicity; Oil pollution; Crude oil; Biodegradation.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1017.pdf

The problems of application of radiocarbon method for estimation of primary production in oligotrophic waters
Provedor de dados: 5
Autores: 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

Measurement of benthic nutrient fluxes in mediterranean shellfish farms - a methodological approach
Provedor de dados: 5
Autores: Grenz, C; Plantecuny, Mr; Plante, R; Alliot, E; Baudinet, D; Berland, B.
Benthic chambers were used to investigate fluctuations in nutrient fluxes and oxygen changes when comparing two benthic biota. Muddy sediments located under mussel-cultivation ropes were compared with a station outside the mussels' influence. Biodeposition from the mussels results in a drastic increase in the nutrient fluxes. A standard procedure is established in order to give reliable comparisons between stations and seasons: as a rule it should include six-hour periods of incubation with sampling intervals of two hours and at least four benthic chambers - preferably six - at each station.
Tipo: Text
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00102/21373/18973.pdf