Ecologie alimentaire des Macrouridae Auteur(s) : Geistdoerfer, Patrick Éditeur(s) : ISTPM Résumé : This paper is a study of the feeding ecology of Macrouridae. After Data on their taxonomy and on the stomach contents, the author gives the results obtained: coefficient of vacuity, indication of a prey frequency, percentage in number and in weight, the mean number of prey per stomach, the mean weight of the prey, the alimentary coefficient of a prey. The diet of every species of Macrouridae and the characteristics of feeding in these species are described. He concludes with considerations on the Macrouridae in the ocean and their geographical distribution, and on the deep feeding chain, especially the trophic role of different groups of preys. It is thought that, in the Macrouridae, the alimentary diet is little specialized, and based on benthic and pelagic preys and a tendency to microphagy which can be considered an adaptation to a deep life. Feeding helps determine the area that the fish inhabits at great depths, particularly their vertical distribution which seems to be in direct relation with feeding ecology. Revue des Travaux de l'Institut des Pêches Maritimes (0035-2276) (ISTPM), 1978-09 , Vol. 42 , N. 3 , P. 177-261 Droits : Ifremer http://archimer.ifremer.fr/doc/1978/publication-1957.pdf http://archimer.ifremer.fr/doc/00000/1957/ | Partager |
Activité magmatique, tectonique et hydrothermale actuelle sur la Dorsale Est Pacifique entre17°-et 19°S(campagne NAUDUR) Auteur(s) : Auzende, Jean-marie Ballu, Valerie Batiza, R Bideau, Daniel Cormier, Mh Fouquet, Yves Geistdoerfer, Patrick Lagabrielle, Yves Éditeur(s) : Gauthier-villars Résumé : The submersible-study of four segments of the East Pacific Rise between 17 degrees and 18 degrees 40'S, where the spreading rate is greater than 150 mm/a, allows us to confirm the variability of the accretion processes. The segment between 17 degrees and 17 degrees 30'S shows an intense present-day magmatic activity. The one between 18 degrees 10' and 18 degrees 22'S shows a mainly tectonic activity. The segment between 18 degrees 22' and 18 degrees 37'S is an intermediate stage with an axial graben in which fresh lavas were emplaced by an extremely young eruption. On all the segments the hydrothermal activity exists ranging from shimmering water up to black smokers, It is associated with different stages of animal colonization. L'étude par le submersible Nautile de quatre segments de la Dorsale Est Pacifique entre 17° et 18°40'S où le taux d'ouverture est de plus de 150 mm/an, permet de confirmer la variabilité des processus de l'accrétion dans le temps et dans l'espace. Le segment compris entre 17° et 17°30'S montre une intense activité magmatique actuelle ou sub-actuelle, celui compris entre 18°10' et 18°22'S montre une activité essentiellement tectonique et celui compris entre 18°22' et 18°37'S une combinaison des deux, le graben d'extension étant partiellement rempli de laves émises lors d'une éruption extrêmement récente. Partout existe une activité hydrothermale, allant de l'émission de fluides moirés à des fumeurs noirs, associée à divers stades de colonisation animale. Comptes Rendus de l'Academie des Sciences Serie II (1251-8069) (Gauthier-villars), 1994-10 , Vol. 319 , N. 7 , P. 811-818 Droits : Académie des Sciences http://archimer.ifremer.fr/doc/00183/29458/27840.pdf http://archimer.ifremer.fr/doc/00183/29458/ | Partager |