Search results for "Endémisme"
showing 3 items of 3 documents
Types nomenclaturaux et Loci Classici des taxons endemiques de la flore de Tunisie
2019
Actuellement, plusieurs projets mondiaux en cours visent à retrouver les matériaux à l'origine de description des plantes vasculaires et à identifier, parmi eux, les types d'onomatophores, les éléments auxquels les noms de taxons sont attachés de manière permanente. La Tunisie est dotée de bonnes connaissances floristiques, bien qu’elle n’héberge qu’un seul herbier reconnu internationalement. Ainsi, presque toutes les collections sur lesquelles sont basées les descriptions des nouveaux taxons sont hébergées dans des pays étrangers. Les types de nomenclature de la plupart des taxons tunisiens sont encore inconnus, même pour les endémiques ce qui rend parfois la recherche scientifique inutile…
The Sinemurian and Pliensbachian ammonites of the «Calcaires de Laffrey » (Isère, France). Description of a new taxon Pseudojamesonites nov. gen. mou…
2009
Some ammonites, formerly collected by René Mouterde within the Sinemurian and Pliensbachian beds of the “Calcaires de Laffrey” (Isère, France), are first described and illustrated in this work. The Sinemurian (Semicostatum chronozone) assemblage, chiefly constituted by Arnioceras gr. robustum (Quenstedt, 1884), is rather usual for the NW European faunas. Conversely, the Pliensbachian (Jamesoni chronozone, Brevispina subchronozone) assemblage is very peculiar. It is chiefly constituted by a very rare species Pseudojamesonites nov. gen. mouterdei nov. sp. (Eoderoceratoidea) which is here described for the first time. The presence, in significant proportion, of this new taxa in the Early Plien…
Phenotypic and genetic variability in Forest thrush, Turdus lherminieri at different scales
2012
Understanding the mechanisms underlying population structure is a crucial issue in evolutionary biology and ecology. Identifying the processes driving biodiversity is also of prime interest to draw up guidelines for population management and conservation planning. Level of differentiation depends on a subtle balance between gene flow, genetic drift and natural selection and insight into the relative contribution of these factors can be provided by spatial and temporal patterns of intra-specific phenotypic and genetic variations. Differentiation has mainly been studied in insular systems because i) islands give ideal framework to study divergence in species ii) islands enclosed endemic fauna…