File:Crevettes rencontrées sur le site hydrothermal Rainbow (Ifremer 00569-68076 - 25257).jpg
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Français : Cette photographie a été prise par l'engin sous-marin Victor 6000 au cours d'une plongée sur le site hydrothermal Rainbow (entre 2200 et 2300 m de profondeur).
On y observe un essaim de crevettes abyssales Rimicaris exoculata et Mirocaris fortunata. Observée pour la première fois sur le site TAG à 3600 m de profondeur en 1986, la crevette Rimicaris exoculata colonise la plupart des sites de la dorsale médio‐Atlantique entre 1700 et 4000 m de profondeur. Ces crevettes forment des "essaims" sur la paroi des cheminées hydrothermales, avec des densités pouvant atteindre 3000 crevettes par m2. La taille moyenne des spécimens de Rimicaris exoculata à l’âge adulte est de 5,5 cm. Les juvéniles sont facilement discernables des adultes par leur couleur orange. Cette couleur est due à la présence d’une réserve de lipides pigmentés qui est absente chez l’adulte. La crevette Mirocaris fortunata n'est connue que des sites hydrothermaux de la dorsale médio-atlantique, bien qu'il existe une autre espèce appartenant au même genre (Mirocaris indica) sur un site hydrothermal de l'océan Indien. De taille plus réduite que Rimicaris exoculata (environ 3 cm de longueur totale), on la trouve en groupes le long des dépressions formées par les cheminées actives. English: This photograph was taken by the Victor 6000 underwater vehicle during a dive on the Rainbow hydrothermal site (between 2200 and 2300 m deep). There we observed a swarm of deep-sea shrimp Rimicaris exoculata and Mirocaris fortunata . First observed at the TAG site at 3600 m depth in 1986, the shrimp Rimicaris exoculata colonizes most sites of the Mid-Atlantic Ridge between 1700 and 4000 m depth. These shrimp form "swarms" on the walls of hydrothermal chimneys, with densities of up to 3000 shrimp per m 2 . The average size of Rimicaris exoculata specimens at adulthood is 5.5 cm. Juveniles are easily distinguished from adults by their orange color. This color is due to the presence of a reserve of pigmented lipids that is absent in adults. The shrimp Mirocaris fortunata is known only from hydrothermal sites of the Mid-Atlantic Ridge, although there is another species belonging to the same genus ( Mirocaris indica ) from a hydrothermal site in the Indian Ocean. Smaller in size than Rimicaris exoculata (about 3 cm in total length), it is found in groups along the depressions formed by active chimneys. |
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| Date | 6 August 2005 (upload date) | |||||||||
| Source | Crevettes rencontrées sur le site hydrothermal Rainbow | |||||||||
| Author | null | |||||||||
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| Keywords | Endemic species; Crustacean; Deep hydrothermal sites; Abyssal species; Abysses | |||||||||
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