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| Registros recuperados: 15 | |
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| Haure, Joel. |
| Une étude spatio-temporelle a été menée de mars 1990 à mars 1991 sur deux stations ostréicoles (nord et sud), de la baie de Bourgneuf. Cette étude se divise en deux parties distinctes : - L'une, hydrobiologique a permis, par des prélèvements hebdomadaires à basse mer plus trois heures, de caractériser les masses d'eau qui baignent chaque point d'étude, - L'autre, a eu pour but d'observer, par un suivi mensuel, l'évolution de la croissance, de l'engraissement et de la mortalité d'un échantillon d'huîtres (Crassostrea gigas) élevé sur chacun des secteurs; L'examen des résultats obtenus amène aux constatations suivantes : - Le secteur nord présente un milieu hétérogène d'une richesse nutritive importante mais est accompagnée d'une charge sestonique minérale... |
| Tipo: Text |
Palavras-chave: Baie de Bourgneuf; Crassostrea gigas; Seston; Météorologie; Hydrobiologie; Croissance; Mortalité; Capacité trophique. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00449/56095/57630.pdf |
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| Cogua,Pilar; Campos-Campos,Néstor Hernando; Duque,Guillermo. |
| En Colombia, la bahía de Cartagena es uno de los ecosistemas costeros más influenciados por la contaminación con mercurio (Hg). Con el propósito de identificar el estado ambiental de la bahía de Cartagena, en este estudio se determinó metilmercurio (MeHg) y mercurio total (HgT) en sedimentos superficiales y seston, durante cinco muestreos (febrero, abril, junio, julio y octubre), en cinco estaciones (Zona Industrial, Frente al Dique, Centro, Boca Chica y Tierra Bomba), dentro de la bahía, durante 2006. Los resultados señalan que el promedio de HgT en los sedimentos fue 0.18 ± 0.01 µg/g p.s y en seston fue 0.16 ± 0.002 µg/g p.s. En ambos casos el 10% corresponde a MeHg. Se encontró una correlación entre HgT y MeHg en sedimentos (r = 0.87, p < 0.0001) y... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mercurio; Metilación; Sedimentos; Seston; Bahía de Cartagena. |
| Ano: 2012 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612012000200002 |
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| BOËCHAT,I. G.; GIANI,A.. |
| Sestonic biochemical composition (lipids, proteins and carbohydrates) may change with varying environmental fluctuations. These changes and the effects in the nutritional status of algae consists of an actual increasing source of interest. The aims of this work were to establish the relationship between biochemical composition of seston and 1) a range of physical, chemical and climatological factors, and 2) the natural fluctuation in the species composition in phytoplankton assemblages of the Pampulha Reservoir, an urban eutrophic lake located in Belo Horizonte, MG. Seasonal changes in the biochemical composition were observed in this study. None of the considered abiotic factors alone seem to affect the biochemical composition. So the effects could only... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biochemical composition; Seston; Seasonality. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100009 |
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| Zurburg, Wouter; Smaal, Aad; Heral, Maurice; Dankers, Norbert. |
| The uptake and release of material by oysters (Crassostrea gigas) in the intertidal zone were estimated in situ in the Bay of Marennes-Oléron (France) in spring and autumn. 10 m long plexiglass tunnels were placed over small tables with bags containing oysters or empty oyster shells (control). Although in the very turbid conditions of the water column sedimentation of suspended particulate material could be observed in control experiments, higher fluxes (uptake) of seston, POC and PON and especially chlorophyll occurred in the presence of live animals. Release of dissolved nutrients was not evident from the tunnel with oysters, which is in contrast with studies in other areas with bivalves. This is ascribed to limited mineralization of biodeposits as an... |
| Tipo: Text |
Palavras-chave: Chlorophyll; Seston; Oysters; Nutrient release; Material uptake. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/1994/publication-6842.PDF |
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| Pouvreau, Stephane; Bodoy, Alain; Buestel, Dominique. |
| In situ clearance rate (CR) and biodeposition of the black pearl oyster, Pinctada margaritifera, were followed during several field experiments from 1996 to 1998 in the lagoon of Takapoto. Serial measurements of total particulate matter (TPM, mg l(-1)), particulate inorganic matter (PLM, mg l(-1)), and particulate organic matter (POM, mg l(-1)) were related to meteorological conditions, especially wind speed. As a general case, POM and PLM increased with wind speed. Nevertheless, PLM increased faster than POM so that the organic content (OC, %) of the TPM decreased progressively when wind speed increased. These TPM variations induced direct changes in feeding processes of P. margaritifera. CR (l h(-1)) averaged 22 l h(-1) for a pearl oyster of 1 g dry... |
| Tipo: Text |
Palavras-chave: Biodeposition; Clearance rate; Seston; Filter feedings behaviour; Tropical lagoon; Tropical bivalve. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-382.pdf |
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| Kerambrun, Elodie. |
| La biodéposition liée à l'exploitation des filières de moules est responsable de l' accumulation de particules fines dans l'environnement marin. Cette biodéposition consiste, à travers la formation de feces et de pseudo feces, en un transfert de particules sestoniques, de la tranche d'eau vers le sédiment. Au cours de ce travail nous avons étudié l'influence des cycles de marée et de l'intensité de celle-ci sur la biodéposition, à travers la mesure de flux verticaux de particules. De même, l'impact de cette biodéposition (aspects qualitatifs et quantitatifs) sur le seston a été abordé. Notre étude montre une variation de l'intensité des flux liée au cycle de marée. Les flux les plus importants sont mesurés lorsque les courants sont les plus intenses,... |
| Tipo: Text |
Palavras-chave: Mollusques; Feces; Pseudofeces; Matière organique; Seston; Biodéposition. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00446/55740/57392.pdf |
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| Heral, Maurice; Zanette, Yvan; Deslous-paoli, Jean-marc; Robert, Jean-michel; Razet, Daniel. |
| In 1979 and 1980, the characteristics of the particulate organic matter are defined fortnightly through seston analyses. It is very high in the basin and very low in the finishing ponds. The phytoplanktonic biomasses are maximal in May in the estuary, and in June-July in the finishing ponds, with chlorophyll contents 10 times higher than those monitored in the basin. Proteins are generally the main biochemical components found in both environments, with glucids accounting for 20 % and lipids for only 10 % of the biochemical components on average. The C/N ratios are almost constant in the finishing ponds with values around 5, typical of phytoplankton, whereas they are very high in the basin except in spring. In the same way, the protid/chlorophyll and the... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Huîtres; Mollusques; Qualité eau; Seston; Matière organique; Claires ostréicoles; Bassin Marennes Oléron. |
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/1981/acte-6213.PDF |
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| Leggieri,Leonardo R.; Ferreiro,Nicolás A.. |
| El bentos, epifiton, seston, las algas filamentosas libres y las plantas acuáticas proporcionan recursos alimenticios y refugio al resto de los niveles tróficos del arroyo. Aquí estudiamos el efecto de una sequía sobre su biomasa y composición elemental en el arroyo Pampeano La Choza, comparando el año 2007, con ~1200 mm anual, y el año 2008, con ~600mm anual (40% menos que el histórico). Considerando que su abundancia dependería principalmente de la transferencia de masa en la capa límite a bajas velocidades y de la deriva aguas abajo, postulamos (H1) que un año seco genera condiciones desfavorables para las plantas acuáticas y el seston, y favorables para las algas filamentosas epifíticas, bentónicas y de matas libres en un arroyo Pampeano. Como son... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plantas acuáticas; Bentos; Epifiton; Seston; Año seco; Masa; Estequiometria ecológica; Arroyo de la llanura pampeana. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2015000300002 |
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| Arnaud, Christophe. |
| A study of the environmental factors in the "pertuis charentais" (charentais straits) has been carried out from 1993 tc 1994. The evolution of water temperature and salinity, as weil as the turbidity, are studied. ln the middle of Breton Strait, near to the long lines, the stratification has not been observed, and the salinity variations are much less sharp than in the stations which are located nearer the coast. The photosynthetic pigments concentrations can be very different in the same time at two close stations; in the Antioch Strait and at the long lines, the values of chlorophyll "a" are comparable; they are much higher in the Breton Strait. At the same time, a study has been made on the physical factors, the photosynthetic pigments concentrations,... |
| Tipo: Text |
Palavras-chave: Pertuis charentais; Facteurs physico-chimiques; Turbidité; Pigments chlorophylliens; Seston; "pertuis charentais"; Physical factors; Turbidity; Photosynthetic pigments; Seston.. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00082/19282/16877.pdf |
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| Tackx, M.. |
| When considering zooplankton feeding as one of the pathways involved in the transfer of substances in marine ecosystems, it is important to study the composition and size distribution of the seston: firstly, the elements in which one is interested may be associated with different types and sizes of particles; secondly, particle size and composition are important factors in relation t o the feeding process of the zooplankton itself. High speed cinematographic studies have recently revealed that copepods use two different mechanisms for feeding. Small particles (< 12 pm) are collected by continuous low amplitude movements of the second maxillae and combing of the appendages. Larger particles are detected and collected individually by means of a specific... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecosystems; Seston; Zooplankton. |
| Ano: 1984 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3273 |
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| Strohmeier, Tore; Strand, Oivind; Alunno-bruscia, Marianne; Duinker, Arne; Cranford, Peter J.. |
| Seasonal variation in blue mussel, Mytilus edulis, retention efficiency (RE) responses to natural seston concentrations were investigated in the Lysefjord, Norway. The smallest particles shown to be effectively retained (100%) were approximately 7 μm and this was observed on only one occasion. The most common response was for RE to progressively increase from small to large particles with maximum RE at 30 to 35 μm (8 of 12 experiments). Temporal changes in the seston size distribution towards a dominance of smaller particles coincided with a decrease in the RE maxima to particles between 7 and 15 μm diameter. The RE of 1 μm and 4 μm diameter particles ranged between 14–64% and 12–86%, respectively, showing that small particles occasionally serve as a... |
| Tipo: Text |
Palavras-chave: Bivalve feeding physiology; Retention efficiency; Clearance rate; Marine ecophysiology; Seston; Suspension feeding; Mytilus edulis. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00054/16509/14024.pdf |
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| Reveillon, Damien; Abadie, Eric; Sechet, Veronique; Masseret, Estelle; Hess, Philipp; Amzil, Zouher. |
| The neurotoxin BMAA (β-N-methylamino-l-alanine) and its isomer DAB (2,4-diaminobutyric acid) have been detected in seafood worldwide, including in Thau lagoon (French Mediterranean Sea). A cluster of amyotrophic lateral sclerosis (ALS), a neurodegenerative disease associated with BMAA, has also been observed in this region. Mussels, periphyton (i.e. biofilms attached to mussels) and plankton were sampled between July 2013 and October 2014, and analyzed using HILIC-MS/MS. BMAA, DAB and AEG (N-(2-aminoethyl)glycine) were found in almost all the samples of the lagoon. BMAA and DAB were present at 0.58 and 0.83, 2.6 and 3.3, 4.0 and 7.2 μg g−1 dry weight in plankton collected with nets, periphyton and mussels, respectively. Synechococcus sp., Ostreococcus... |
| Tipo: Text |
Palavras-chave: BMAA; Diatoms; Chaetoceros sp.; Seston; Mytilus galloprovincialis; HILIC-MS/MS. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00275/38607/37192.pdf |
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| Registros recuperados: 15 | |
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