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Registros recuperados: 30 | |
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Kurata, A. |
The changes in concentration of thiamine, biotin and vitamin B sub(12) in water of the soaked bottles for 6 h in situ in the north basin of Lake Biwa were examined successively over 30 hours. The concentrations of the vitamins changed comparatively during 6 h. soaking in situ. Generally, the concentrations of thiamine, biotin and vitamin B sub(12) were in high levels in the morning and in low levels in evening both in the soaked bottles and in the surrounding water. The fluctuation ranges in concentration of vitamins in a 5 m deep layer were greater than those in thermocline. From the data obtained with the soaked bottles in situ, it was supposed that the decrease of vitamins in concentration during the daytime surpass consumption of vitamins by... |
Tipo: Text |
Palavras-chave: Phytoplankton; Microorganisms; Bacteria; Metabolism; Biological production; Vitamin B; Fresh water. |
Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-958.pdf |
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Jacq, E; Moal, Jeanne; Samain, Jean-francois; Corre, S; Daniel, J; Nicolas, Jean-louis; Cochard, Jean-claude; Fera, P. |
Larval rearings were performed with seawater either freshly pumped or after storage in a pond. Concerning bacterial populations these waters were characterized by a high diversity, little sized bacteria whose few of them (1%) were cultivable on Zobell medium. In the tanks, the bacterial ecosystem was modified by the presence of antibiotics, larvae and algae: the diversity was lowered, the cellular volume was increased by a factor 2 to 5, 100% bacteria were cultivable and chloramphenicol resistant, and their metabolism changed. Taxonomic screening showed no differences among the two waters neither at the beginning nor at the end of the rearings. However, depending on the water (stored or not) differences were identified for bacterial physiology and... |
Tipo: Text |
Palavras-chave: Marine aquaculture; Pond culture; Scallop culture; Ecology; Antibiotics; Organic matter; Grazing; Carbohydrates; Mathematical models; Modelling; Growth; Bacterial diseases; Biological production; Culture tanks; Larvae; Rearing. |
Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-914.pdf |
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Gervasi, E; Jeuniaux, C; Dauby, P. |
Chitin was estimated in samples of planktonic crustaceans living in Calvi Bay (Corsica). The percentages of chitin, with respect to dry weight, are comprised between 3.10% in Clausocalanus spp. and 12.22% in Cladocera (mainly Evadne ). The percentage of chitin remained approximatively constant during larval development in Calanus helgolandicus (3.26%). Using these results and the values of total biomass and production estimated by Dauby (1985) at the same place during a complete annual cycle (1983-1984), chitin biomass and production were calculated for every planktonic crustacean species (or group of species) and for the whole crustacean plankton. Daily chitin production was maximum during May (20.06 mg.m super(-2)/d). As far as the whole year is... |
Tipo: Text |
Palavras-chave: Copepoda; Biological production; Zooplankton. |
Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/1987/acte-1373.pdf |
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Tapia, M.E.. |
This work includes the composition and distribution of phytoplankton in the coastal region. For this purpose were established 23 stations on three regions and six sections divided from the northern region of Esmeraldas to the south of Puerto Bolívar, this work was carried out at the Research Vessel Orión in december 2008. The greater diversity of the phytoplankton community in the surface layer was observed in the Central Region, Specifically in section 4 with a total of 84 species, highlighting the dominant species of diatoms as Rhizosolenia stolterfothii, Thalasssiosira subtilis, R. imbricata, Proboscia alata, Chaetoceros affinis, and in the group there were abundant dinoflagellates Gonyaulax poledra and Goniodoma polyedricum, characteristics of the... |
Tipo: Journal Contribution |
Palavras-chave: Composition; Distribution; Phytoplankton; Biological production; Species diversity. |
Ano: 2013 |
URL: http://hdl.handle.net/1834/5752 |
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Meddeb, M.; Ben Othman, H.; Hadj Mabrouk, H.; Sakka Hlaili, A.. |
Cette étude s’est intéressée à déterminer l’effet du Benzo [a]pyrène, un contaminant organique de la famille des HAP, sur la communauté bactérienne planctonique, au niveau de la lagune (zone faiblement polluée par le B[a]py) et le canal (zone très polluée par le B[a]py) de Bizerte en été et automne 2009. Des communautés bactériennes, collectées des deux stations, ont été maintenues en culture pendant 6 jours sous trois différents traitements, un témoin (non contaminé) et deux contaminations avec 0,5 mg l-1 (B[a]py1) et 1 mg l-1 (B[a]py2) du B[a]py. Au cours de l’incubation, l’abondance, le taux de production et le taux de croissance du bactérioplancton ont été déterminés. En juillet, le bactérioplancton a présenté, dans le milieu naturel de la lagune, une... |
Tipo: Journal Contribution |
Palavras-chave: Nannoplankton; Accumulation; Biological production; Growth. |
Ano: 2013 |
URL: http://hdl.handle.net/1834/5904 |
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Montiel, Américo; Andrade, Claudia; Quiroga, Eduardo. |
El gastrópodo carnívoro Trophon geversianus (Pallas, 1774) es una de las especies bentónicas explotadas comercialmente en la región de Magallanes, de la cual no existe información relacionada a su productividad biológica. En este trabajo, se estimó la producción secundaria y productividad de una población intermareal de T. geversianus a través del modelo de redes neurales. Los muestreos se realizaron estacionalmente en Bahía Laredo, estrecho de Magallanes entre los meses de agosto 2007 y abril 2008. La longitud de los ejemplares de T. geversianus fluctuó de 12,4 a 55,4 mm (28,4 ± 7,4). La población presentó una distribución unimodal. Las densidades medias estacionales oscilaron entre 0,23 ind m-2 y 0,97 ind m-2, mientras que la biomasa media varió entre... |
Tipo: Journal Contribution |
Palavras-chave: Marine molluscs; Secondary production; Biological production; Gasterosteidae; Muricidae; Http://aims.fao.org/aos/agrovoc/c_41671; Http://aims.fao.org/aos/agrovoc/c_47299. |
Ano: 2009 |
URL: http://hdl.handle.net/1834/4169 |
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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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Registros recuperados: 30 | |
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