Véronique Barriel

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Molecular trees based on the analysis of sequence data can be obtained through parsimony procedures. Such approaches identify evolutionary events (homologies and homoplasies and their location in the tree). Nevertheless, it is not possible generally to analyze directly the information given by the aligned sequences. Noticeably, gaps ("indel") need special(More)
There are two competing theories about the interrelationships of craniates: the cyclostome theory assumes that lampreys and hagfishes are a clade, the cyclostomes, whose sister group is the jawed vertebrates (gnathostomes); the vertebrate theory assumes that lampreys and gnathostomes are a clade, the vertebrates, whose sister group is hagfishes. The(More)
A phylogenetic study of the Elephantidae (Proboscidea, Mammalia) is based on the cytochrome b mitochondrial gene: 31 terminals, that is, all known sequences, one non-elephantid proboscidean, the extinct American mastodon, and four outgroups. The data set includes 11 new sequences with the first published sequence of the forest African elephant, L. a.(More)
The phylogenetic position of cyclostomes, i.e., the relationships between hagfishes, lampreys, and jawed vertebrates is an unresolved problem. Anatomical data support the paraphyly of cyclostomes, whereas nuclear genes data support monophyly of cyclostomes. Previous results obtained using mitochondrial DNA are ambiguous, presumably due to a lack of(More)
Previous studies have demonstrated that the agent of Pneumocystis pneumonia (PcP), Pneumocystis carinii, is actually a complex of eukaryotic organisms, and cophylogeny could explain the distribution of the hosts and parasites. In the present work, we tested the hypothesis of cophylogeny between the primate-derived Pneumocystis group and their hosts.(More)
The phylogenetic relationships between recent Elephantidae (Proboscidea, Mammalia), that is to say extant elephants (Asian and African) and extinct woolly mammoth, have remained unclear to date. The prevailing morphological scheme (mammoth grouped with Asian elephant) is either supported or questioned by the molecular results. Recently, the monophyly of(More)
Among the African elephants, it has been unanimously acknowledged that the forest elephants (cyclotis form) are peculiar, so that they have been elevated to the specific rank. The development of molecular analyses of extant Loxodonta has only focused on two forms yet: the savannah form (africana) and the forest form (cyclotis), disregarding the so-called(More)
We have cloned the mitochondrial DNA fragment extending from tRNA-Leu to the cytochrome oxidase subunit 1 (COI) genes of Branchiostoma lanceolatum, Myxine glutinosa, Lampetra fluviatilis, and Scyliorhinus caniculus and have determined their respective gene sequences and organization. In all four species, this region contains the ND1 and ND2 genes and the(More)
Pneumocystis fungi represent a highly diversified biological group with numerous species, which display a strong host-specificity suggesting a long co-speciation process. In the present study, the presence and genetic diversity of Pneumocystis organisms was investigated in 203 lung samples from woodmice (Apodemus sylvaticus) collected on western continental(More)
Bats belong to a wide variety of species and occupy diversified habitats, from cities to the countryside. Their different diets (i.e., nectarivore, frugivore, insectivore, hematophage) lead Chiroptera to colonize a range of ecological niches. These flying mammals exert an undisputable impact on both ecosystems and circulation of pathogens that they harbor.(More)