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| Jollivet, D; Desbruyeres, Daniel; Ladrat, Christine; Laubier, Lucien. |
| Alvinellid polychaetes are, to date, restricted to deep-sea hydrothermal vents of the eastern and the western ridges of the Pacific Ocean. These organisms Live in various sulfide-rich habitats, including the hottest part of the hydrothermal environment (i.e. chimneys). They experience transient anoxia, high levels of heavy metals and H2S, natural radioactivity and temperatures ranging from 5 to 80 degrees C which vary greatly with time. The Alvinellidae, as many vent organisms, have developed specific adaptations to cope with this harsh and unstable environment. Enzyme systems are good markers of the adaptation of ectotherms to temperature, which acts on both enzyme kinetics and protein denaturation. We estimated genetic distances between 11 alvinellid... |
| Tipo: Text |
Palavras-chave: DEEP-SEA HYDROTHERMAL VENTS; ALLOZYMES; ASPARTATE AMINO TRANSFERASE; GLUCOSE-6-PHOSPHATE ISOMERASE; PHOSPHOGLUCOMUTASE; TEMPERATURE; SELECTION. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00213/32394/30857.pdf |
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| Colin, C; Bourles, Bernard. |
| Pegasus current measurements carried out along a section located off French Guiana are presented; the section was repeated five times from September 1989 to June 1991 during the NOE (region Nord-Ouest equatoriale)/STACS (Sub Tropical Atlantic Climate Studies) cruises on board the NOAA (National Oceanographic and Atmospheric Administration) research vessels. The data (vertical and horizontal distributions) show, as suggested by earliest observations, the presence of different currents. At the surface, and in winter, the North Brazil Current (NBC) flows northwestward (positive), is strong (120 cm/s), confined in the first 250 m, coastally trapped (within 250 km) and fed by offshore waters; in summer the NBC strengthens (the velocity increases to 150 cm/s),... |
| Tipo: Text |
Palavras-chave: CURRENTS; TEMPERATURE; SALINITY; WESTERN BOUNDARY; EQUATORIAL ATLANTIC. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00098/20881/18495.pdf |
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