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Inproceedings Reference Cranial morphology of Khirtharia inflata (Raoellidae, Artiodactyla)
Raoellidae are extinct small-sized semiaquatic artiodactyls that are the closest relatives to crown clade Cetacea. They display morphological features showing the transition between terrestrial and aquatic lifestyles and therefore bring crucial information to understand the earliest steps of cetacean evolution. Raoellid cranial morphology, including the ear region and endocranial morphology, has been documented using cranial remains referred to Indohyus indirae from the Kalakot area, Jammu and Kashmir in India. The study of these specimens highlighted that several cetacean features are already present in raoellids. The previously available Indohyus material was very deformed, preventing access to quantitative data and leading to potential misinterpretations. We describe new undeformed cranial material from the Kalakot area, documenting another raoellid species, Khirtharia inflata. The new observations allow us to complete our knowledge of raoellid cranial morphology, including the original shape of the cranium and brain endocast and to confirm the specificities of raoellid morphology within Artiodactyla. We further provide the first quantitative data for the different brain components and show that Raoellidae had low encephalization and neocorticalization values, much lower than cetaceans and close to early diverging, primitive, dichobunoid artiodactyls. Reconstruction of the blood sinuses above the cerebellum supports the previous “intraosseous” hypothesis about the initial steps of the development of the caudal venous rete mirabile in cetaceans. The presence of several cetacean cranial features in Raoellidae, such as the peculiar shape of the frontal, the strong postorbital constriction, the periotic involucrum, or the elongation of the olfactory bulbs, questions the definition of the Cetacea clade.
Located in Library / RBINS Staff Publications 2023 OA
Inproceedings Reference New specimens and CT data of the longirostrine crocodylian Thoracosaurus isorhynchus from the Maastrichtian of Mont-Aimé (Paris Basin, France)
Thoracosaurs are a polyphyletic group of Cretaceous–Paleogene longisrostrine crocodylians from Europe and North America. Traditionally perceived as gavialoids, phylogenetically closer to Gavialinae than to Tomistominae, they play a key role in the gharial problem: their old age and seemingly close relationship to Gavialinae is inconsistent with molecular clock estimates indicating a far younger origin of Gavialoidea. Moreover, the phylogenetic position of thoracosaurs is debated, as recent studies suggested thoracosaurs are non-crocodylian eusuchians instead. Here we describe thoracosaur material from Mont-Aimé, France, rediscovered in the collections of the Musée d’Histoire Naturelle de Lille. The Mont-Aimé is famous for its richness in fossil vertebrates, among which the longirostrine species Thoracosaurus isorhynchus (formerly T. macrorhynchus). Confusion about the age of the vertebrate layers has recently been solved, indicating that they are Maastrichtian in age instead of Danian. The new material most likely belongs to T. isorhynchus based on a flexure in the ectopterygoid–pterygoid suture, a distinctive character found in adults of this taxon. Our study reveals new characters not visible on previously known material. An example is the short posterior non-dentigerous process of the maxilla, a character shared with early Paleogene longirostrines and tomistomines but not with gavialines. Furthermore, microCT data of the skull reveal for the first time endocranial characters of this taxon, such as the presence of an internal recess in the parietal. Together with redescribed T. isorhynchus material from the Muséum d’Histoire Naturelle, Paris, this leads to an updated phylogenetic position of this taxon.
Located in Library / RBINS Staff Publications 2023
Inproceedings Reference Locomotor behavior of Paleocene mammals: Insights from the semicircular canals of the inner ear
The end-Cretaceous mass extinction triggered the collapse of ecosystems and a drastic turnover in mammalian communities leading to the demise of many ecologically specialized species. While Mesozoic mammals were ecomorphologically diverse, recognizable ecological richness was only truly established in the Eocene. Questions remain about the ecology of the first wave of mammals radiating after the extinction. Here, we use the semicircular canals of the inner ear as a proxy for locomotor behavior. Thirty new inner ear virtual endocasts were generated using high-resolution computed tomography scanning. This sample was supplemented by data from the literature to construct a dataset of 79 fossils spanning the Jurassic to the Eocene alongside 262 extant mammals. Vestibular sensitivity was measured using the radius of curvature against body mass and the residuals of this relationship were analyzed. The petrosal lobule size relative to body mass were compared with the inner ear data as they have a role in maintaining gaze stabilization during motion. Paleocene mammals exhibited smaller canal radius of curvature, compared to Mesozoic, Eocene, and extant taxa. In the early Paleocene, canal radius and associated petrosal lobules were relatively smaller on average compared to other temporal groups, suggesting less ability for fast movements. Our results support previous work on tarsal morphology and locomotor behavioral ancestral state reconstructions suggesting that ground dwelling mammalian species were more common than arboreal taxa during the Paleocene. Ultimately, this may indicate that the collapse of forested environments immediately after extinction led to the preferential survivorship of more terrestrially adapted mammals.
Located in Library / RBINS Staff Publications 2023
Inproceedings Reference Influence of an urbanization gradient on the vertical stratification of arboreal ants in green areas
EVALUATION OF DIFFERENT TAXONOMIC LEVELS AS SURROGATES OF ANT DIVERSITY IN GREEN AREAS IN AN URBANIZED ENVIRONMENT E. B. A. KOCH1, T. S. MELO2,3,4, A. R. S. ANDRADE2,3, M. LEPONCE5 & J. H. C. DELABIE2,4 1Programa de Pós-graduação em Ecologia e Evolução, Universidade Estadual de Feira de Santana (UEFS), CEP: 44.036-900 - Feira de Santana, Bahia, Brazil, e-mail: elmoborges@gmail.com; 2Programa de Pós-graduação em Ecologia, Universidade Federal da Bahia (UFBA), Salvador, Bahia, Brazil; 3Centro de Ecologia e Conservação Animal, Universidade Católica do Salvador (UCSal), Salvador, Bahia, Brazil; 4Laboratório de Mirmecologia, Convênio Universidade Estadual de Santa Cruz (UESC)/Comissão Executiva do Plano da Lavoura Cacaueira (CEPLAC), Ilhéus, Bahia, Brazil; 5Biodiversity Monitoring & Assessment, Royal Belgian Institute of Natural Sciences (RBINS), Bruxelas, Belgium. In cities located in environments of high biological importance, urbanization leads to changes in biotic diversity, while monitoring these changes can be difficult. Studies have pointed to the use of metrics that replace species as an alternative. Surrogate models are easily determined measures of biodiversity that correlate strongly with species richness and with what you want to investigate, being useful for detecting or monitoring environmental changes. The use of higher taxonomic levels has been applied to groups of megadiverse organisms, such as arthropods, since difficulties in identifying species are predictable. The aim of this study was to evaluate the practicality of using taxonomic diversity of ants as a surrogate of green area coverage in an urban environment. Four levels of "surrogate resolutions" (subfamily, genus, indicator taxa, and intermediate resolution) were assessed to the taxonomic diversity of ants across three levels of urban green areas (Small = 0 to 35%
Located in Library / RBINS Staff Publications 2023
Inproceedings Reference Evaluation of different taxonomic levels as surrogates of ant diversity in green areas in an urbanized environment
EVALUATION OF DIFFERENT TAXONOMIC LEVELS AS SURROGATES OF ANT DIVERSITY IN GREEN AREAS IN AN URBANIZED ENVIRONMENT E. B. A. KOCH1, T. S. MELO2,3,4, A. R. S. ANDRADE2,3, M. LEPONCE5 & J. H. C. DELABIE2,4 1Programa de Pós-graduação em Ecologia e Evolução, Universidade Estadual de Feira de Santana (UEFS), CEP: 44.036-900 - Feira de Santana, Bahia, Brazil, e-mail: elmoborges@gmail.com; 2Programa de Pós-graduação em Ecologia, Universidade Federal da Bahia (UFBA), Salvador, Bahia, Brazil; 3Centro de Ecologia e Conservação Animal, Universidade Católica do Salvador (UCSal), Salvador, Bahia, Brazil; 4Laboratório de Mirmecologia, Convênio Universidade Estadual de Santa Cruz (UESC)/Comissão Executiva do Plano da Lavoura Cacaueira (CEPLAC), Ilhéus, Bahia, Brazil; 5Biodiversity Monitoring & Assessment, Royal Belgian Institute of Natural Sciences (RBINS), Bruxelas, Belgium. In cities located in environments of high biological importance, urbanization leads to changes in biotic diversity, while monitoring these changes can be difficult. Studies have pointed to the use of metrics that replace species as an alternative. Surrogate models are easily determined measures of biodiversity that correlate strongly with species richness and with what you want to investigate, being useful for detecting or monitoring environmental changes. The use of higher taxonomic levels has been applied to groups of megadiverse organisms, such as arthropods, since difficulties in identifying species are predictable. The aim of this study was to evaluate the practicality of using taxonomic diversity of ants as a surrogate of green area coverage in an urban environment. Four levels of "surrogate resolutions" (subfamily, genus, indicator taxa, and intermediate resolution) were assessed to the taxonomic diversity of ants across three levels of urban green areas (Small = 0 to 35%
Located in Library / RBINS Staff Publications 2023
Inproceedings Reference Importance of green area rate nesting site and exotic species on native ants in an urban environment
EVALUATION OF DIFFERENT TAXONOMIC LEVELS AS SURROGATES OF ANT DIVERSITY IN GREEN AREAS IN AN URBANIZED ENVIRONMENT E. B. A. KOCH1, T. S. MELO2,3,4, A. R. S. ANDRADE2,3, M. LEPONCE5 & J. H. C. DELABIE2,4 1Programa de Pós-graduação em Ecologia e Evolução, Universidade Estadual de Feira de Santana (UEFS), CEP: 44.036-900 - Feira de Santana, Bahia, Brazil, e-mail: elmoborges@gmail.com; 2Programa de Pós-graduação em Ecologia, Universidade Federal da Bahia (UFBA), Salvador, Bahia, Brazil; 3Centro de Ecologia e Conservação Animal, Universidade Católica do Salvador (UCSal), Salvador, Bahia, Brazil; 4Laboratório de Mirmecologia, Convênio Universidade Estadual de Santa Cruz (UESC)/Comissão Executiva do Plano da Lavoura Cacaueira (CEPLAC), Ilhéus, Bahia, Brazil; 5Biodiversity Monitoring & Assessment, Royal Belgian Institute of Natural Sciences (RBINS), Bruxelas, Belgium. In cities located in environments of high biological importance, urbanization leads to changes in biotic diversity, while monitoring these changes can be difficult. Studies have pointed to the use of metrics that replace species as an alternative. Surrogate models are easily determined measures of biodiversity that correlate strongly with species richness and with what you want to investigate, being useful for detecting or monitoring environmental changes. The use of higher taxonomic levels has been applied to groups of megadiverse organisms, such as arthropods, since difficulties in identifying species are predictable. The aim of this study was to evaluate the practicality of using taxonomic diversity of ants as a surrogate of green area coverage in an urban environment. Four levels of "surrogate resolutions" (subfamily, genus, indicator taxa, and intermediate resolution) were assessed to the taxonomic diversity of ants across three levels of urban green areas (Small = 0 to 35%
Located in Library / RBINS Staff Publications 2023
Inproceedings Reference From field to models: Creating a geological framework for groundwater
Located in Library / RBINS Staff Publications 2023
Article Reference Étude des vestiges anthropologiques, fauniques et archéologiques découverts dans la Grotte des Enfants à Freyr, Belgique (Néolithique récent)
En 1964, un groupe de spéléologues amateurs de Villers-la-Ville, appelé "Vampire", fouille une cavité dans les Rochers de Freyr situés dans la Province de Namur (Belgique). Les vestiges exhumés sont actuellement conservés au Musée régional d’Histoire naturelle de Mons. Le matériel archéologique est pauvre et composé principalement d’éclats de silex. Il est difficilement datable sans contexte, ni documentation précise. Notre inventaire recense 557 restes humains et 151 restes fauniques. L’étude préliminaire de la faune indique principalement une accumulation de proies par des carnivores et la présence d’animaux fouisseurs. Aucune trace de feu ou de boucherie n’a été notée. L’étude anthropologique montre que, comme dans les nombreuses autres sépultures collectives du Bassin mosan, les squelettes humains sont incomplets et les os fragmentés. Elle révèle qu’au moins six (voire sept) individus ont été placés dans cette grotte. Trois d’entre eux ont été datés au radiocarbone et remontent au Néolithique Récent. Le résultat le plus surprenant est qu’il s’agit uniquement de sujets immatures (ce qui expliquerait le nom donné à la grotte). Le plus jeune serait décédé entre 1 et 3 ans et le plus âgé est un adolescent. C’est à ce dernier qu’appartiendrait le seul crâne conservé. Afin de représenter l’état de conservation de chaque os de cette sépulture collective, nous avons créé des fiches spécifiques aux individus immatures qui pourront être utiles à tous ceux qui étudient des ensembles funéraires rassemblant de nombreux non-adultes. Aucune trace de pathologies graves n’a été relevée mais tous les tibias présentaient des lignes de Harris et 17 % des dents isolées étaient atteintes d’hypoplasie de l’émail dentaire. On dénombre également un cas de spina bifida atlantis. Parmi les particularités anatomiques, signalons une perforation olécranienne de l’humérus, une incisive en forme de pelle et une fosse d’Allen sur un des fémurs.
Located in Library / RBINS Staff Publications 2023
Article Reference Les restes humains non-incinérés d’époque gallo-romaine du Musée Gallo-Romain de Tongres. Une étude anthropologique et paléopathologique
En Belgique, les restes humains datés de la période gallo-romaine restent peu étudiés par rapport aux époques plus récentes. Cela s’explique notamment par la pratique de l’incinération qui est majoritaire à cette période ainsi que par le peu de nécropoles découvertes dans nos régions, en particulier celles comportant des sépultures à inhumation. À travers cette étude, nous avons étudié les ossements humains de 56 individus principalement issus de la nécropole principale de l’importante ville de Tongres (province de Limbourg, Flandre, Belgique). L’espace funéraire fut utilisé du Ier au IVe siècle bien que l’inhumation concerne majoritairement le IIIe et le IVe siècle. Le but de notre approche était de proposer une caractérisation de la population (sexe, âge, stature) ainsi qu’une large étude paléopathologique (pathologies dentaires, infections, fractures, marqueurs de stress non-spécifiques, modifications dégénératives des articulations ainsi que de nombreux cas pathologiques individuels). Les nombreuses observations réalisées ont été confrontées entre elles mais aussi avec des données contextuelles connues telles que le type de tombe, la répartition spatiale, la datation et les résultats de sites similaires. Ce qui nous a permis de distinguer des tendances intéressantes au sein de la population ainsi que des différences en fonction du groupe social. La présente étude a permis de mieux connaître la population de Tongres, l’une des cités antiques gallo-romaines les plus importantes de Belgique, ainsi que les nombreuses pathologies et stress auxquels elle était soumise. Mais également de comprendre leur répartition au sein de l’espace et de la vie sociale et proposer de nombreuses perspectives.
Located in Library / RBINS Staff Publications 2022
Unpublished Reference AFRICAN MAN AND BIOSPHERE RESERVES: GUIDANCE TO ASSESS ECOSYSTEM SERVICES. AMANUAL FOR AFRICAN BR MANAGERS
Located in Library / RBINS Staff Publications 2023