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The biology of the deep-water shrimp Solenocera acuminata has been poorly studied in spite of the commercial interest of the species on the continental slope of French Guiana. In order to establish the distribution, the abundance, the reproduction and the growth of the species, four scientific surveys were conducted on the Guianese slope in 1990 and 1991, and samples from commercial fisheries were also regularly observed from 1988 to 1993. S. acuminata is only caught during the night, at a depth of about 200 m where catch rates reach 10 kg/h/trawl. The females show two seasons of sexual maturation, in May–June and in November–December. The parameters of the Von Bertalanffy growth equation were estimated from the size frequency distributions for males and females separately. Maximum life span of the species is about 2 years, and sexual maturity of females is reached at the end of the first year of life.  相似文献   

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《Comptes Rendus Palevol》2002,1(7):599-613
The whole formed by his Paléontologie française, his Prodrome, and his Cours élémentaire, which are closely linked, constitutes one of the major parts of Alcide d’Orbigny’s scientific production, in which he exposed his concept of Palaeontology as a science closely related with Zoology and as an indispensable tool for Stratigraphy. The result was a remarkable impulsion for palaeontological and stratigraphical research, which from that time developed on new scientific foundations. Two annexes complete this communication, the first concerning the ‘Comité de la Paléontologie française’ (1860–1893), the second specifying the publication dates of four volumes of the Paléontologie française.  相似文献   

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Sans résuméReçu par la rédaction le 5.1.1960  相似文献   

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Le percher est un comportement répandu chez les espèces d’un assemblage de Scarabaeinae d’une forêt non perturbée de Guyane française. Quarante-trois espèces de percheurs ont été répertoriées sur 7 ans d’échantillonnage. Les fouisseurs diurnes de petite taille (moyenne 7,0 mm) dominaient sur les feuilles isolées et autour des défécations de Singes hurleurs ou des fèces humaines, avec une hauteur moyenne de percher de 62,8 cm. Les hauteurs étaient positivement corrélées aux tailles des insectes excepté pour cinq grandes espèces dont trois possédaient une défense chimique contre les prédateurs. Deux complexes mimétiques ont été identifiés. L’agrégation en dehors de la présence de ressource a été montrée. Les défécations de singes provoquaient une concentration d’insectes dont des Canthon (Glaphyrocanthon) arboricoles qui formaient leurs pilules sur les feuilles. D’autres espèces perchaient en attente de rencontrer au sol un partenaire ou de se livrer au kleptoparasitisme. Les signaux olfactifs pourraient jouer un rôle dans diverses modalités du percher. Compétition et prédation semblent être les principales contraintes auxquelles le percher répond.  相似文献   

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Sans résuméEDITOR'S note. — this is the first of a series ofCritical Reviews, contributed by outstanding representatives of mycological research forMycopathologia et Mycologia Applicata at the request of the Editor. TheseReviews will cover practically every country on the globe where serious mycological research is going on. In this way we hope to present the results of mycological research in concentrated form, with global aims, including countries which are lesser known in the international community of mycologists, but made, nonetheless, substantial contributions to our knowledge. TheseReviews should show the present state of mycological research in a given geographical area, its future trend and should be the source of mutual incentive for even higher goals to be achieved.  相似文献   

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R. Schnell 《Plant Ecology》1950,2(4-5):331-340
Sans résuméReçue par la rédaction le 18-X-1949.  相似文献   

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Values for selected morphometric relationships are extremely important for shrimp fisheries management. This information, however, does not exist for some deep-sea shrimp species which are of interest to fisheries. A variety of weight-weight, length-length and length-weight relationships have been established, therefore, for two commercially important species of deep-sea shrimp from the continental slope off French Guiana (western central Atlantic), i.e. the solenocerid shrimp Solenocera acuminata (orange shrimp) caught on the upper slope (about 200 m) and the aristeid shrimp Plesiopenaeus edwardsianus (scarlet prawn) widely distributed on the middle slope (from 400 to 900 m). This paper represents the first contribution on the morphometric relationships of these two deep-sea shrimp species.  相似文献   

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