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| Gallet, Alison; Koubbi, Philippe; Léger, Nelly; Scheifler, Mathilde; Ruiz-rodriguez, Magdalena; Suzuki, Marcelino T.; Desdevises, Yves; Duperron, Sebastien. |
| Myctophids are among the most abundant mesopelagic teleost fishes worldwide. They are dominant in the Southern Ocean, an extreme environment where they are important both as consumers of zooplankton as well as food items for larger predators. Various studies have investigated myctophids diet, but no data is yet available regarding their associated microbiota, despite that the significance of bacterial communities to fish health and adaptation is increasingly acknowledged. In order to document microbiota in key fish groups from the Southern Ocean, the bacterial communities associated with the gut, fin, gills and light organs of members of six species within the three myctophid genera Electrona, Protomyctophum and Gymnoscopelus were characterized using a 16S... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00598/70973/69202.pdf |
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| Bellec, Laure; Clerissi, Camille; Edern, Roseline; Foulon, Elodie; Simon, Nathalie; Grimsley, Nigel; Desdevises, Yves. |
| Background: Numerous studies have investigated cospeciation (or cophylogeny) in various host-symbiont systems, and different patterns were inferred, from strict cospeciation where symbiont phylogeny mirrors host phylogeny, to complete absence of correspondence between trees. The degree of cospeciation is generally linked to the level of host specificity in the symbiont species and the opportunity they have to switch hosts. In this study, we investigated cophylogeny for the first time in a microalgae-virus association in the open sea, where symbionts are believed to be highly host-specific but have wide opportunities to switch hosts. We studied prasinovirus-Mamiellales associations using 51 different viral strains infecting 22 host strains, selected from... |
| Tipo: Text |
Palavras-chave: Cophylogeny; Prasinovirus; Phycodnaviridae; Mamiellale; Chlorophyta; Specificity. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00374/48497/48827.pdf |
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| Desdevises, Yves; Maillet, Vincent; Fuentes, Michael; Escriva, Hector. |
| A methodology for inducing spawning in captivity of the lancelet Branchiostoma lanceolatum has been developed recently with animals collected at the Racou beach, in the southern coast of France. An increasing amount of laboratories around the world are now working on the evolution of developmental mechanisms (Evo-Devo) using amphioxus collected in this site. Thus, today, the development of new aquaculture techniques for keeping amphioxus in captivity is needed and the study of the natural conditions at which amphioxus is exposed in the Racou beach during their spawning season becomes necessary. We have investigated the amphioxus distribution, size frequency, and population structure in the Racou beach during its natural spawning season using multivariate... |
| Tipo: Text |
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| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00374/48567/48940.pdf |
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| Yau, Sheree; Krasovec, Marc; Benites, L. Felipe; Rombauts, Stephane; Groussin, Mathieu; Vancaester, Emmelien; Aury, Jean-marc; Derelle, Evelyne; Desdevises, Yves; Escande, Marie-line; Grimsley, Nigel; Guy, Julie; Moreau, Hervé; Sanchez-brosseau, Sophie; Van De Peer, Yves; Vandepoele, Klaas; Gourbiere, Sebastien; Piganeau, Gwenael. |
| Virus-microbe interactions in the ocean are commonly described by “boom and bust” dynamics, whereby a numerically dominant microorganism is lysed and replaced by a virus-resistant one. Here, we isolated a microalga strain and its infective dsDNA virus whose dynamics are characterized instead by parallel growth of both the microalga and the virus. Experimental evolution of clonal lines revealed that this viral production originates from the lysis of a minority of virus-susceptible cells, which are regenerated from resistant cells. Whole-genome sequencing demonstrated that this resistant-susceptible switch involved a large deletion on one chromosome. Mathematical modeling explained how the switch maintains stable microalga-virus population dynamics... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00623/73461/72701.pdf |
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