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Registros recuperados: 14
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La détermination de l'âge par scalimétrie chez le saumon atlantique (Salmo salar) dans son aire de répartition méridionale : utilisation pratique et difficultés de la méthode ArchiMer
Baglinière, J. L.; Bomassi, P.; Bousquet, B.; Chancerel, F.; De Pontual, Helene; Dumas, J.; Euzenat, G.; Fontenelle, G.; Fournel, F.; Gayou, F.; Luquet, J. F.; Maisse, G.; Martin Ventura, J. A.; Marty, A.; Nihouarn, A.; Porcher, J. P.; Prevost, E.; Prouzet, Patrick; Pustelnik, G.; Richard, A.; Troadec, Herve.
This report confirms interpretation criteria used in scale reading for age determination of Atlantic Salmon in freshwater and in sea water with typical examples. The difficulties for age determination of wild and reared populations by showing atypical examples are presented. Finally some recommandations to a better knowledge of Atlantic salmon population in south distribution area are proposed.
Tipo: Text
Ano: 1985 URL: https://archimer.ifremer.fr/doc/00480/59127/61755.pdf
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Campagne d'étude du littoral Nord Pas de Calais - HYDROBIOS ArchiMer
Bentley, D.; Dupont, J.; Richard, A..
Dans le cadre d'un suivi de la qualité des eaux du littoral nord, le RNO a mis en place une campagne hydrobiologique, "Hydrobios 80". Des prélèvements destinés à l'étude des paramètres hydrologiques et de la qualité microbiologique des eaux ont été réalisés dans le détroit du Pas-de-Calais. La zone étudiée pendant l'été 80, s'étend sur une frange d'environ 5 miles le long des côtes de la baie de Somme à la frontière belge. Elle assure ainsi la continuité avec la zone côtière belge surveillée régulièrement par MOMMAERTS et Coll. (fig. 1). La campagne a comporté trois types d'études. - En huit sites différents ont été exécutées des radiales, séries de 3 à 4 points de prélèvement situés sur un même axe, à peu près perpendiculairement à la côte. Ces radiales...
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Ano: 1980 URL: http://archimer.ifremer.fr/doc/00036/14719/12024.pdf
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Bioaccumulation dans la chaîne alimentaire du littoral nord-Pas de Calais ArchiMer
Oudard, E.; L'Hopitault, J.c.; Delattre, J.m.; Lemaire, J.; Janquin, M.a.; Degros, N.; Richard, A..
La bioaccumulation des métaux et polluants organiques toxiques dans les chaînes biologiques est un des effets les plus pernicieux de la pollution des eaux marines. Responsable d'accidents imprévisibles au vu des teneurs relevées dans les eaux (mercure à Minamata, DDT dans l'Arctique, ... ) elle est extrêmement difficile à modéliser in vitro, tant sont nombreux les paramètres et interactions en jeu (température, pH, salinité, durée; forme chimique du polluant, ions associés; espèce étudiée, organe, stade, ... ).
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Ano: 1989 URL: http://archimer.ifremer.fr/doc/00033/14385/11677.pdf
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Etude par télédétection des eaux du littoral Nord Pas de Calais ArchiMer
Viollier, M.; Bentley, D.; Richard, A..
Le travail porte sur l'utilisation d'une méthode de télédétection, la couleur de l'océan, en tant qu'aide à Un programme d'océanographie régionale, l'étude du Détroit du Pas de Calais. Une séquence de 5 images de l'expérience Coastal Zone Color Scanner (CZCS) entre le 1er et le 15 mai 1980 est étudiée en fonction des conditions météorologiques et des connaissances hydrologiques générales que l'on peut avoir sur cette région. Bien que certaines conclusions soient encore provisoires, ces documents donnent un grand nombre d'informations, notamment sur la répartition des matières en suspension. De vastes échanges transversaux entre les deux côtes sont observés ce qui pourrait amener à revoir les schémas de transport SW NE, généralement admis.
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Ano: 1981 URL: http://archimer.ifremer.fr/doc/00088/19919/17585.pdf
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Analyse des communautés des fonds de sable de la Manche Orientale et du Sud de la Mer du Nord ArchiMer
Prygiel, Jean; Quisthoudt, C.; Richard, A..
Les études de prospection en Manche et en Mer du Nord Occidentale montrent l'existence de cinq unités biosédimentaires parmi lesquelles la communauté à Ophelia borealis. Cette communauté est établie sur des bancs sableux parallèles à la côte qui sont suceptibles de fournir d'importantes quantités de sables et de graViers marins. Des prélèvements saisonniers sédimentologiques, hydrologiques et faunistiques permettent de préciser les caractéristiques de quatre d'entre eux: - Le sédiment est constitué pour 60 à 90% de sables fins à moyens dont la médiane est comprise entre 190 et 260 µm. - Le Haut Fond de Gravelines se situe dans une zone côtière ou l'importance des divers rejets entraine l'apparition d'un milieu eutrophe. Les bancs du Dyck et de la Bassure...
Tipo: Text
Ano: 1985 URL: http://archimer.ifremer.fr/doc/00104/21508/19089.pdf
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Impact de l'environnement sur les communautés benthiques littorales (sable à Ophelia). Rapport d'activité 1984-1985 ArchiMer
Prygiel, Jean; Richard, A..
Ce travail de Recherche engagé à la station de Wimereux constitue la matière d'une thèse de 3ème cycle de l'université des sciences et Technique de Lille. Les recherches ont débuté fin 1983 et devraient s'achever courant 1988. Cette activité est appuyée par une bourse lFREMER / REGION depuis octobre 1984. La recherche comprend 2 partie : - 1ère partie : elle comprend une cartographie des unités biosidémentaires de la Manche Orientale et de la Mer du Nord Occidentale ainsi qu'un bilan bibliographique et descriptif des unités bionomiques. Cette cartographie bénéficie d'une subvention de fonctionnement IFREMER / REGION pour les années 1984 - 1985 et 1985 - 1986. - 2ème partie : elle consiste en une analyse des impacts de l'environnement sur les peuplements...
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Ano: 1984 URL: http://archimer.ifremer.fr/doc/00036/14767/12076.pdf
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Recruitment of meroplanktonic larvae in the Southern Bight of the North Sea OMA
Belgrano, A.; Vincx, M.; Dewarumez, J.-M.; Richard, A.; Craeymeersch, J.A.; Heip, C.H.R..
The density distribution of meroplanktonic larvae is compared with the density distribution of adults in the benthos, at five coastal stations in the Southern Bight of the North Sea (<i>Abra alba</i> community). Plankton communities were sampled during one tidal cycle, along a buoy traject or at a fixed point; southern and northern locations, 250 m from each central sampling point, have been investigated too. Benthos samples were taken only at the central points of this traject. Meroplankton consisted of polychaete larvae (9 families) and bivalve and echinoderm larvae. The highest density values of these larvae (6,400 ind.10.25 m<sup>2</sup>) are found on the southern sites of each traject (closest to the coastline). The highest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Meiobenthos Meroplankton Recruitment ANE; North Sea; Southern Bight.
Ano: 1990 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7114
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The cycle of activity in the accessory nidamental glands from cephalopods OMA
Richard, A.; Van den Branden, C.; Decleir, W..
The reproductive system of female cephalopods includes a glandular system (oviduct glands and nidamental glands), which develops considerably during sexual maturation and which plays an important part in the formation of the different egg membranes. It is generally uncoloured. An exception are the nidamental glands in <i>Nautilus pompilius</i> which are composed of opaque yellowish or yellowish-green tissue (Ref. 1). Moreover all Sepioidea and Myopsida and <i>Ctenopteryx</i>, a species belonging to the Oegopsida (Ref.2) possess accessory nidamental glands. The most striking property of these glands is their intense coloration varying from yellow to orange and red. This paper is a comparative study of the accessory nidamental glands...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Endocrine systems; Glands; Cephalopoda.
Ano: 1979 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3609
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The differentiation of blood proteins during ontogeny in <i>Sepia officinalis</i> L. OMA
Decleir, W.; Lemaire, J.; Richard, A..
1. Blood from embryos, young animals and adult <i>Sepia officinalis</i> L. has been analysed by an ultramicroelectrophoretic technique.2. During the differentiation of a very small embryo into a 2-month-old animal, we have found eleven different protein fractions. 3. All these proteins have been identified as hemocyanin by histochemical tests. 4. The possible origin of the embryonic, young and adult hemocyanins is discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Blood types Ontogeny Proteins Sepia officinalis Linnaeus; 1758 [Common cuttlefish] ANE; France; Nord; Wimereux.
Ano: 1971 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3432
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L'hémocyanine et la glande branchiale de <i>Sepia officinalis</i> L. (Mollusque Céphalopode) OMA
Decleir, W.; Richard, A.; Lemaire, J.; Wolf, G..
The branchial gland from the cuttlefish (cephalopod mollusc) consists of extensively irrigated tissue, which shows a typical ultrastructure of protein-secreting cells: prominent nucleolus, elaborate system of granular endoplasmic reticulum and active Golgi apparatus. The possible hemopoietic role of the gland is sustained by our biochemical results.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sepia officinalis Linnaeus; 1758 [Common cuttlefish].
Ano: 1977 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3568
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A study of the orange-red pigment from the accessory nidamental glands of the cephalopod <i>Sepia officinalis</i> L. OMA
Decleir, W.; Richard, A..
In adult female cuttlefish an orange-red pigment concentrates in the accessory nidamental glands. This pigment is tightly bound to granules which are actively secreted by the glands. The only way to dissolve the pigment is an incubation in 40 % NaOH. Afterwards the pigment becomes readily soluble in most organic solvents. Its solubility, its behaviour in thin layer chromatography and its visible adsorption spectrum prove that the pigment is a carotenoid. It is probably formed by oxidation of a carotene. Since its properties do not correspond entirely with those of the known carotenoids, the new cephalopod pigment was called Sepiaxanthine.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carotenoids Glands Pigments Vitamin A Cephalopoda Sepia officinalis Linnaeus; 1758 [Common cuttlefish].
Ano: 1972 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3453
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Le foie embryonnaire de <i>Sepia officinalis</i> L. (mollusque céphalopode): 1. Organogenèse OMA
Lemaire, J.; Richard, A.; Decleir, W..
The rudiments of the "hepatopancreas" appear early, in stage 20, as a pair of diverticula, given off from the midgut. The anterior part which lies against the yolk-sac will become the "liver". The growth of the liver exhibits a close relationship to the development of the inner yolk-sac. An electron microscopic study has been made of the hepatic epithelium at different embryonic stages. From stage 27, the cytologic aspects of the hepatic cell (presence of "balls", cytoplasm with well developed granular endoplasmic reticulum and free ribosoms...) give evidence of secretory activity. These ultrastructural features show that the liver becomes functional and allow us to think that it plays a part in the embryonic metabolism during the last stages of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Embryonic development Liver Organogenesis Sepia officinalis Linnaeus; 1758 [Common cuttlefish].
Ano: 1977 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3566
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La glande nidamentaire accessoire de <i>Sepia officinalis</i> L.: analyses biochimiques des pigments des bactéries symbiotiques OMA
Van den Branden, C.; Richard, A.; Lemaire, J.; Decleir, W..
An electron microscopic study of the accessory nidamental glands from <i>Sepia officinalis</i> L. shows a secretory cycle in the epithelial cells and the presence of bacteria in the tubules of the gland. A correlation between sexual maturity, the color of the gland and the total number of symbiotic bacteria can be demonstrated. A biochemical study shows that the correlation of the gland is due to several carotenoid pigments. The most important of these is an orange-red xanthophyll that has been called Sepiaxanthine. It is probably formed in the bacteria as a result of the secretory activity of the epithelial glandular cells. This whole mechanism and the role of the bacteria and pigments need further research.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacteria Glands Pigments Symbionts Sepia officinalis Linnaeus; 1758 [Common cuttlefish].
Ano: 1979 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3618
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Carotenoid producing bacteria in the accessory nidamental glands of <i>Sepia officinalis</i> L. OMA
Van den Branden, C.; Gillis, M.; Richard, A..
1. The accessory nidamental glands of the cuttlefish, <i>Sepia officinalis</i> L. show an intensive orange-red coloration in mature females. This colour is due to carotenoid pigments which occur in symbiotic bacteria. 2. Six different pigmented strains of bacteria were isolated. 3. The main pigment in five of these strains is beta-carotene. 4. The main pigment in the sixth strain is the keto carotenoid, adonixanthin.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sepia officinalis Linnaeus; 1758 [Common cuttlefish].
Ano: 1980 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3643
Registros recuperados: 14
Primeira ... 1 ... Última
 

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