Consulta: creatorFacets:"Chevaldonne, Pierre"
Registros recuperados: 6
Data/hora: 05/06/2024 11:28:45

Typologie des biocénoses benthiques de Méditerranée Version 2
Provedor de dados: 5
Autores: Michez, Noemie; Fourt, Maia; Aish, Annabelle; Bellan, Gérard; Bellan Santini, Denise; Chevaldonne, Pierre; Fabri, Marie-claire; Goujard, Adrien; Harmelin, Jean-georges; Labrune, Celine; Pergent, Gerard; Sartoretto, Stephane; Vacelet, Jean; Verlaque, Marc.
Suite à l’acquisition de nouvelles informations sur les habitats marins méditerranéens, une mise à jour du référentiel national était nécessaire pour qu’il soit le reflet des connaissances actuelles. Ces nouvelles informations proviennent principalement de deux campagnes d’exploration des roches profondes et des canyons méditerranéens appelées MEDSEACAN et CORSEACAN, de CARTHAM (Cartographie des Habitats Marins) – deux programmes pilotés par l’Agence des Aires Marines Protégées – ainsi que de propositions émanant directement de la communauté scientifique. En collaboration avec les experts scientifiques benthologues, ces nouvelles observations ont été confrontées à la typologie (Michez et al., 2011) et des modifications et compléments ont été décidés. Ce...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00272/38315/36556.pdf

Cryptic species of Archinome (Annelida: Amphinomida) from vents and seeps
Provedor de dados: 5
Autores: Borda, Elizabeth; Kudenov, Jerry D.; Chevaldonne, Pierre; Blake, James A.; Desbruyeres, Damien; Fabri, Marie-claire; Hourdez, Stephane; Pleijel, Fredrik; Shank, Timothy M.; Wilson, Nerida G.; Schulze, Anja; Rouse, Greg W.
Since its description from the Galapagos Rift in the mid-1980s, Archinome rosacea has been recorded at hydrothermal vents in the Pacific, Atlantic and Indian Oceans. Only recently was a second species described from the Pacific Antarctic Ridge. We inferred the identities and evolutionary relationships of Archinome representatives sampled from across the hydrothermal vent range of the genus, which is now extended to cold methane seeps. Species delimitation using mitochondrial cytochrome c oxidase subunit I (COI) recovered up to six lineages, whereas concatenated datasets (COI, 16S, 28S and ITS1) supported only four or five of these as clades. Morphological approaches alone were inconclusive to verify the identities of species owing to the lack of discrete...
Tipo: Text
Palavras-chave: Deep sea; Hydrothermal vents; Cold methane seeps; Cryptic species; Polychaete.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00157/26814/24961.pdf

Feeding strategies and resource partitioning mitigate the effects of oligotrophy for marine cave mysids
Provedor de dados: 5
Autores: Rastorgueff, Pierre-alexandre; Harmelin-vivien, Mireille; Richard, Pierre; Chevaldonne, Pierre.
We investigated how large populations of several mysid species can coexist in oligo trophic underwater marine caves and their relationships in the marine cave food web using carbon and nitrogen stable isotopes. Isotopic signatures indicate food partitioning among the 5 species of cave-dwelling mysids from the northwest Mediterranean Sea we studied. Hemimysis speluncola feeds mainly on phytoplankton and zooplankton from outside the caves, Siriella gracilipes on sedimentary organic matter and zooplankton from outside, Harmelinella mariannae on small cave-dwelling crustaceans, and Hemimysis margalefi and Hemimysis lamornae mediterranea on sedimentary particulate organic matter. These differences in diet could promote coexistence of such diverse and abundant...
Tipo: Text
Palavras-chave: Trophic ecology; Resource partitioning; Mysidacea; Marine caves; Oligotrophy; Stable isotopes; NW Mediterranean.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00372/48307/48426.pdf

Hydrothermal-vent alvinellid polychaete dispersal in the eastern Pacific .1. Influence of vent site distribution, bottom currents, and biological patterns
Provedor de dados: 5
Autores: Chevaldonne, Pierre; Jollivet, Didier; Vangriesheim, Annick; Desbruyeres, Daniel.
Deep-sea hydrothermal-vent habitats are typically linear, discontinuous, and short-lived. Some of the vent fauna such as the endemic polychaete family Alvinellidae are thought to lack a planktotrophic larval stage and therefore not to broadcast-release their offspring. The genetic evidence points to exchanges on a scale that seems to contradict this type of reproductive pattern. However, the rift valley may topographically rectify the bottom currents, thereby facilitating the dispersal of propagules between active vent sites separated in some cases by 10s of kilometers or more along the ridge axis. A propagule flux model based on a matrix of intersite distances, long-term current-meter data, and information on the biology and ecology of Alvinellidae was...
Tipo: Text
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00337/44780/44597.pdf

Metabolomic profiling reveals deep chemical divergence between two morphotypes of the zoanthid Parazoanthus axinellae
Provedor de dados: 5
Autores: Cachet, Nadja; Genta-jouve, Gregory; Ivanisevic, Julijana; Chevaldonne, Pierre; Sinniger, Frederic; Culioli, Gerald; Perez, Thierry; Thomas, Olivier P.
Metabolomics has recently proven its usefulness as complementary tool to traditional morphological and genetic analyses for the classification of marine invertebrates. Among the metabolite-rich cnidarian order Zoantharia, Parazoanthus is a polyphyletic genus whose systematics and phylogeny remain controversial. Within this genus, one of the most studied species, Parazoanthus axinellae is prominent in rocky shallow waters of the Mediterranean Sea and the NE Atlantic Ocean. Although different morphotypes can easily be distinguished, only one species is recognized to date. Here, a metabolomic profiling approach has been used to assess the chemical diversity of two main Mediterranean morphotypes, the "slender" and "stocky" forms of P. axinellae. Targeted...
Tipo: Text
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00371/48267/48591.pdf

Sister-species of eastern Pacific hydrothermal vent worms (Ampharetidae, Alvinellidae, Vestimentifera) provide new mitochondrial COI clock calibration
Provedor de dados: 5
Autores: Chevaldonne, Pierre; Jollivet, Didier; Desbruyeres, Daniel; Lutz, Richard; Vrijenhoek, Robert.
Introduction : The evolutionary age of some of the hydrothermal vent taxa have recently become a highly debated issue. Vestimentiferan worms (= siboglinid polychaetes) in particular, have been claimed to be as old as 430 million years based on the occurrence of fossilized tubes resembling those of currently known Vestimentifera (Little et al., 1997), while other authors, based on molecular data, have claimed they must be younger than 100 million years old (Black et al, 1997; Halanych et al., 1998). One explanation for this apparent discrepancy might be that tubes, such as those found in the Silurian fossil vent communities, did not belong to vestimentiferans, but rather to other tube-dwelling polychaetes. However, it is also possible that the choice of the...
Tipo: Text
Palavras-chave: Allopatric speciation; Polychaetes; Polychaetes; Hydrothermal vent.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-895.pdf