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| Registros recuperados: 31 | |
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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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| 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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| Torres Ch., G.. |
| Se estima la productividad primaria en concentración de clorofila "a" y feopigmentos, como indicativo de la calidad del primer nivel trófico-fitoplancton, registrados en el Estrecho Bransfield, Bahía Chile (Noreste de la Isla Greenwich) y en el Paso Drake, durante la VII Expedición Ecuatoriana a la Antártida a bordo del B/I ORION durante el verano austral de 1998. La biomasa fitoplanctónica superficial de clrofila "a" en el Estrecho Bransfield, registró las mayores concentraciones (0.7-0-8 mg/m3) hacia el noreste del estrecho, y las menores concentraciones de 0.2 mg/m3 se localizaron hacia el centro. A nivel subsuperficial de los 20 m se registraron las más altas concentraciones de toda la columna de agua (0-100 m), con una distribution latitudinal casi... |
| Tipo: Journal Contribution |
Palavras-chave: Chlorophylls; Pigments; Biomass; Biological production; Phytoplankton; Polar waters; Pigments; Biomass; Biological production; Phytoplankton. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/3846 |
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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, G.; Franco, V.; Cedeño, E.; Calderón, T.; Salazar, E.. |
| Esta investigación comprende los estudios del fitoplancton-zooplancton-ictioplancton, realizados en tres sitios de la Península Santa Elena durante agosto 2002, área designada para la proyección de "Arrecife Artificial de las Fuerzas Militares del Ecuador": un avión, barco y tanque de guerra, estructuras artificiales consideradas como basura chatarra (de gran tamaño), que serían recicladas para la bio-exploración artificiales hacia la seguridad de los recursos marinos del Ecuador. En el Estudio Ambiental se describen las consideraciones necesarias de carácter multidisciplinario (EIA-INOCAR, 2002). |
| Tipo: Journal Contribution |
Palavras-chave: Biological production; Artificial reefs; Plankton; Zooplankton; Phytoplankton; Ichthyoplankton; Biological production; Plankton; Zooplankton; Phytoplankton; Artificial reefs; Http://aims.fao.org/aos/agrovoc/c_36649; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_25395. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/2343 |
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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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| Coello, D.; Prado, M.; Cajas, J.; Cajas, L. de. |
| Planktonic information obtained in four fixed stations in front of Esmeraldas coast, Punta Galera, Puerto López and salinas is analyzed, during 1999-2000 and 2003-2006 periods. Temporal variability of phytoplankton and zooplankton densities between 2004 and 2006 were mainly determined by the oceanographic characteristics, and by the interrelations between the components of plankton and seasonal distribution of the organisms, as well. Higher phytoplankton productivity was determined in front of Esmeraldas, whereas the higher concentrations of zooplankton were obsrved in Puerto López, this evidences the predation at the first by the second trophic level. the phytoplankton composition in Esmeraldasis mainly influenced by the Esmeraldas river whereas in Port... |
| Tipo: Journal Contribution |
Palavras-chave: Plankton; Aquatic communities; El Nino phenomena; Biological production. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5368 |
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| Registros recuperados: 31 | |
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