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- 저자 : PATRITI,Gibert (검색결과 4 건)
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PATRITI,Gilbert 嶺南大 海洋科學硏究所 1989 Marine Nature Vol.2 No.1
Zooplanktonic community of the brackish pound "Etang de Berre" near Marseilles is made of 97% of Acartia tonsa population. This copepoda was recently signalized for the first time in the Mediterranean. The study of migratory behaviour of this species was carried out during a continuous daily cycle. The migratory exchanges between the differents levels are not limited to the sunset migration brings individuals from which intermediate levels to the surface. During the daily cycle appears an evolutionary behaviour. This behaviour would result of a change of the A. tonsa phototaxis in account with values of the illumination(variation and threshold). Some values of illumination would regularly spread the organisms in the environment. The most important upward migration occurs at sunset for the threshold value of 0.5μw ??. La communaute zooplanctonique de l'etang de Berre, milieu dessale proche de Marseille, est compose a 97% par une population d'Acartia tonsa. copepode recemment signale en Mediteranee. L'etude du comportement migratoire de cette espece a ete envisagee au cours d'un cycle nycthemeral de 24 heures. Les echanges migratoires entre niveaux ne sont pas limites a la seule migration crepusculaire qui conduit les individus des couches intermediaires vers la surface Ⅱ semble exister au cours du nycthemere tout un comportement evolutif qui resulterait de la modification de la phototaxie d'A. tonsa en relation avec les valeurs de l'irradiance (son sens et certaines valeurs seuil). Certaines valeurs de l'irradiance provoqueraient notamment une diffusion des organismes dans le milieu. Le plus important mouvement migratoire ascendant se produit au crepuscule au seuil d'irradiance de 0.5μw ??.
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PATRITI,Gilbert 嶺南大 海洋科學硏究所 1989 Marine Nature Vol.2 No.1
Two complemental experiments were conceived in order to study the relationship between the swimming activity of Acartia tonsa (copepoda) and light intensity. In the first experiment the swimming activity was measured by actotaxigraphy in a vertical tank. In the second experiment, it was studied by visual observation in an horizontal tank. These two experiments led us draw a graph showing swimming activity versus light intensity. This graph shows a daily cycle in which swimming occurs at dawn and during the night. This activity could be the fact of males only. No proof of a nycthemeral migration was found. L'etude experimentale de l'activite natatoire du Copepode Acartia tonsa en fonction du flux lumineux a ete entreprise a l'aide de deux methodes complementaires. Lactotaxigraphie par groupe d'individus nous a permis de tester le comportement natatoire en cuve verticale. La deuxieme technique etait plus particulierement destinee a tester le comportement en cuve horizontale. Nous avons ainsi pu etablir une courbe de reponse du comportement d'A. tonsa a differentes valeurs de l'intensite lumineuse et mettre en evidence un cycle journalier d'activite natatoire en periode crepusculaire et nocturne (peut etre a imputer aux males de l'espece). Par contre il n'a pu etre decele de migration nycthemerale nette.
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DISTRIBUTION SPATIOTEMPORELLE DES SIPHONOPHORES AU DESSUS DES MARGES ATLANTIQUE ET MEDITERANEENNE
PATRITI,Gilbert 嶺南大 海洋科學硏究所 1995 Marine Nature Vol.4 No.1
Several diel cycles, with the help of opening closing net system, have been carried out during two missions in both the Northwestern Mediterranean Sea and the Bay of Biscay in Northeastern Atlantic Ocean above submarine canyons cutting into continental slope. A serie of oblique hauls were carried out simultaneously at different levels during several diel periods. The aims of this study is a preliminary estimation, in this area, of the siphonophores distribution and migration. This migrations are sometimes difficult to value and many causes able to screen diel migrations are examined. In relation with the environment where those diel migrations are produce and in account to recent paper on gelatinous organisms it is true that many siphonophores are able to take a part to the modification in fall of organic matter on the both continental slope and shelf. This fact is the consequence of passive horizontal stream transport coupled with vertical migrations of this organisms. Also the high predation capacity of siphonophores is able to increase the effect of modification on planktonic organisms. Au cours de deux missions, l'une en Atlantique dans le folfe de Gascogne, l'autre en Mediterranee Nord Occidentale, au dessus de canyons entamant le talus continental, des prelevements zooplanctoniques, a l'aide de filets ouvrant-fermant, tires simultanement, ont ete effectues au cours de plusieurs cycles nycthemeraus. Le but de cette etude etait une estimation preliminaire, dans ces zones, de la distribution verticale des siphonophores ainsi que leurs migrations verticales nycthemerales. Ces migrations etant parfois difficiles a mettre en evidence, plusieur causes probables, susceptibles de masquer ces mouvements spatiotemporels, sont discutees. En relation avec le milieu ou ces migrations se produisent et compte tenu des recherches recentes sur les organismes "gelatineux", il s'avere que les siphonophores peuvent prendre part a la modification de la richesse en matiere organique du talus et du plateau continental de facon passive par le transport advectif du aux courants couples aux migrations verticales de ces organismes. Cette contribution peut aussi etre probablement accentuee par leurs importantes capacites de predation pouvant influer fortement sur le milieu palnctonique.
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TYPE TROPHIQUE ET RYTHME NUTRITIONNEL DE QUELQUES EUPHAUSIACES MEDITERRANEENS
YOON,Won Duk,PATRITI,Gibert 嶺南大 海洋科學硏究所 1995 Marine Nature Vol.4 No.1
We have undertaken the nutritional behaviour of six species of euphausiacea by study of guts contents during diel migration, throughout 24 hours. This study has been carry out during Cyaflux mission (part of the Ecomarge program) in northwestern Mediterranean sea. In early times we have considered the trophic type and feeding rythm. Species have an omnivorous diet and may be adapted to the environmental food conditions. None is strictly phytophagous and only Stylocheiron longicorne G. O. Sars, 1883 and Stylocheiron abbreviatum G. O. Sars, 1883 have a carnivorous tendancy. It seems that there is relation between migration and feeding rythm. RESUME: Le comportement alimentaire d'euphausiaces recueillis lors de la mission Cyaflux (dans le cadre du programme Ecomarge) en Mediterranee nord-occidentale, au cours d'un cycle de 24h a ete apprehende lors de la migration verticale de six especes par l'etude des contenus stomacaux et envisage sous la forme, dans un premier temps, du type trophique dt du rythme de nutrition. Les milieu. Neanmoins aucune ne s'est averee strictement phytophage et seules Stylocheiron longicorne G. O. Sars, 1883 et Stylocheiron abbreviatum G. O. Sars, 1883 auraient des tendances carnivores. Ⅱ semble qu'ily ait une relation entre migration et rythme nutritionnel.
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