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Article Reference Karl Edward Havens (1957–2019)
Located in Library / RBINS Staff Publications 2019
Article Reference Karyotype variability and inter-population genomic differences in freshwater ostracods (Crustacea) showing geographical parthenogenesis
Transitions from sexual to asexual reproduction are often associated with polyploidy and increased chromosomal plasticity in asexuals. We investigated chromosomes in the freshwater ostracod species Eucypris virens (Jurine, 1820), where sexual, asexual and mixed populations can be found. Our initial karyotyping of multiple populations from Europe and North Africa, both sexual and asexual, revealed a striking variability in chromosome numbers. This would suggest that chromosomal changes are likely to be accelerated in asexuals because the constraints of meiosis are removed. Hence, we employed comparative genomic hybridization (CGH) within and among sexual and asexual populations to get insights into E. virens genome arrangements. CGH disclosed substantial genomic imbalances among the populations analyzed, and three patterns of genome arrangement between these populations: 1. Only putative ribosomal DNA (rDNA)-bearing regions were conserved in the two populations compared indicating a high sequence divergence between these populations. This pattern is comparable with our findings at the interspecies level of comparison; 2. Chromosomal regions were shared by both populations to a varying extent with a distinct copy number variation in pericentromeric and presumable rDNA-bearing regions. This indicates a different rate of evolution in repetitive sequences; 3. A mosaic pattern of distribution of genomic material that can be explained as non-reciprocal genetic introgression and evidence of a hybrid origin of these individuals. We show an overall increased chromosomal dynamics in E. virens that is complementary with available phylogenetic and population genetic data reporting highly differentiated diploid sexual and asexual lineages with a wide variety of genetic backgrounds.
Located in Library / RBINS Staff Publications 2018
Inbook Reference Kellwasser horizons, sea-level changes and brachiopod–coral crises during the late Frasnian in the Namur–Dinant Basin (southern Belgium): a synopsis.
Located in Library / RBINS Staff Publications
Article Reference Krakatauia recta (Wiedemann, 1830) in coastal habitats in Singapore with a re-description and notes on its Oriental and Australasian distribution, and the description of a new related Krakatauia species from the Philippines (Diptera: Dolichopodidae)
Located in Library / RBINS Staff Publications 2024
Book Reference L'arbre du vivant, trente ans de systématique
Located in Library / RBINS Staff Publications
Incollection Reference L'arbre du vivant: classification phylogénétique des Annélides
Résumé Les Annélides, ou vers segmentés, forment un groupe généralement considéré comme monophylétique, qui est traditionnellement divisé entre les Polychaeta et les Clitellata. Ils sont évolutivement anciens, écologiquement importants et extrêmement diversifiés en terme d’espèces et de plans d’organisation. Pour ces raisons, les Annélides ont toujours constitué l’un des problèmes majeurs dans la résolution de la phylogénie des Métazoaires. La révolution conceptuelle et méthodologique liée à l’analyse cladistique et surtout l’accès, via l’ADN, à une nouvelle classe de caractères ont bouleversé la classification des Annélides au cours des 20 dernières années. Tout récemment, le développement de la phylogénomique a permis, non seulement, de proposer une phylogénie de base stable pour les Annélides mais, également, de résoudre les principaux problèmes liés à ce groupe, tels que la monophylie des Annélides, la composition taxinomique du groupe, le plan d’organisation de l’annélide ancestral, ou la nature mono- ou paraphylétique des Polychètes et des Oligochètes. Ce travail résume les connaissances les plus récentes sur la phylogénie et l’évolution d’un taxon dont l’extraordinaire diversité a peu d’équivalent parmi les Métazoaires. Mots clés : Annélides, phylogénie, évolution Summary Annelida, or segmented worms, constitute a group generally considered as monophyletic, traditionally divided between Polychaeta and Clitellata. They are evolutionary ancient, ecologically important and extremely diversified in terms of species and body plans. For these reasons, Annelida have always represented one of the largest unsolved problems in metazoan phylogeny. The conceptual and methodological revolution related to cladistic analysis and, in particular, access to a fully new category of characters through DNA have drastically changed the classification of Annelida during the last 20 years. Very recently, the development of phylogenomics enabled not only to propose a stable basal phylogeny of Annelida but, also, to resolve the main problems associated to this group, namely the annelid monophyly, the taxonomic composition of the group, the body plan of the ancestral annelid, or the mono- or paraphyletic nature of Polychaeta and Oligochaeta. This work summarizes the most recent knowledge on phylogeny and evolution of a taxon of which the extraordinary diversity has few equivalent amongst the Metazoa. Key words: Annelids, phylogeny, evolution
Located in Library / RBINS Staff Publications
Article Reference L'atelier gallo-romain de pierres à aiguiser de Le Châtelet-sur-Sormonne (Ardennes, France) : mise à profit de matières premières lithiques locales et diffusion régionale des outils.
Located in Library / RBINS Staff Publications 2016
Article Reference L'histoire naturelle est un gros mot - Quand les stratégies économiques détruisent l'identité d'un lieu
Located in Library / RBINS Staff Publications 2020
Article Reference L’approvisionnement en terre cuite architecturale du second forum de Bavay.
Located in Library / RBINS Staff Publications 2018
Article Reference L’approvisionnement en terre cuite architecturale du second forum de Bavay
Located in Library / RBINS Staff Publications 2019