Search publications of the members of the Royal Belgian institute of natural Sciences
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Reconstruction of environmental and climatic changes during the Late Glacial at Moerbeke (Flemish Valley, Belgium) usingmulti proxy lake sediment analyses
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Approches palynologique et dendrochronologique de la mise en place du paysage dans le Champsaur (Hautes-Alpes, France) à l'interface des dynamiques naturelles et des dynamiques sociales. Thématique, méthodologie et premiers résultats
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Salvage Archaeology and Geoarchaeology: The example of the coastal margin between Antibes and Nice (France)
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Dynamique du peuplement et activités agropastorales à l’Age du Bronze dans les vallées du Haut-Champsaur et de Freissinière (Parc des Ecrins, Hautes-Alpes)
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Mise en place du paysage dans un milieu de moyenne et haute montagne du Tardiglaciaire à l’époque actuelle. Analyse du signal palynologique en Champsaur (Hautes-Alpes, France) à l’interface des dynamiques naturelles et des dynamiques sociales
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Evolution géomorphologique holocène des plaines alluviales niçoises. Les fouilles archéologiques préventives sur les chantiers de l’ancienne Gare du Sud, du parking Notre-Dame et du Tramway
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Caractéristiques paléontologiques des couches de transition Westphalien A/B dans le bassin de Campine (sondage de Peer KB206)
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Nhung ket qua buocdautrongviec khao sat cac hang dong karst ngamvungthixa Son La cuadoi khao sat hang dong Bi - Viet Nam (Preliminary results of the speleological study of Belgian - Vietnamese Expedition in Son La)
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Diagenetic history of Westphalian A and B fluvio-deltaic deposits: an example from the KB206 Peer borehole (Campine Basin, NE-Belgium)
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Stratigraphy and cyclic nature of Lower Westphalian deposits in the boreholes KB174 and KB206 in the Belgian Campine
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Fossielhoudende rivierafzettingen en moeraskleien uit de Mombeekvallei bij Wimmertingen
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Pijpvormige vuurstenen van de Holsteen.
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X-ray computerized tomography study of heterogenities in Westphalian A&B coal strata (Peer coalbed methane project; Campine Basin, NE Belgium).
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La Mer de Barents
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Confirmation de la présence de Sceliphron curvatum (Smith, 1870) en Belgique (Insecta: Hymenoptera: Sphecidae)
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Characterization, Comparative Analysis and Phylogenetic Implications of Mitogenomes of Fulgoridae (Hemiptera: Fulgoromorpha)
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Robber flies from mangroves in Hong Kong (Diptera: Asilidae)
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Ontogeny of the jaws of monogonont rotifers: the malleate trophi of Rhinoglena and Proalides (Ploima, Epiphanidae)
- Information on the embryonic development of the malleate trophi in Epiphanidae (Rotifera, Monogononta, Ploima) is presented, based on scanning electron microscopy observations in Rhinoglena fertoeensis, R. frontalis, R. kutikovae, R. tokioensis, and Proalides tentaculatus, to contribute to the understanding of this structure of high evolutionary and functional relevance in Rotifera. The first observable and distinctly sclerotized structures were a double row of median transversal sclerites along the longitudinal axis, wherein the future unci, rostellar scleropili, cristae rami, and basal apophyses became recognizable. Fulcrum and manubria arose subsequently; the fulcrum sclerites were longitudinally ordered in a double layer. The rami chambers developed last as lamellar structures. Unci appeared as separate thin, elongate elements, the primary uncini, developing to uncus plates by transversal growth and apposition of sclerite material on the shafts of the uncini. The heads of the uncini showed their greatest development after fusion of their shafts into uncus plates. The interjacent spaces between the heads functioned as a mold, organizing bundles of sclerites which developed into the uniseriate, zigzag-shaped cristae rami. The fulcrum attained its definite shape by elongation of the double layer of rod-shaped sclerites into appressed sclerofibrillae. Manubria became visible as a proximal ridge of sclerites, whereupon a triangular lamella composed of crisscross-oriented sclerites developed distally, growing out to the manubrial chambers. Ramus chambers originated from two longitudinal amorphous lamellae incorporating the median rami sclerites and closing from distal to proximal; subbasal chambers were formed before the basal chambers.
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The genus Rhinoglena (Rotifera, Monogononta, Ephiphanidae) in North America, with the description of two new species
- Based on material from aquatic habitats in the northern Chihuahuan Desert and a literature review, we present an account on the occurrence of genus Rhinoglena in North America. Two new species are described, and the presence of Rhinoglena frontalis in the USA is confirmed. Of the two new species, R. texana n. sp. is a close relative of R. frontalis, whereas R. ovigera n. sp. is unique by being oviparous, in contrast to all other Rhinoglena which are viviparous. This prompts a revision of the generic diagnosis of Rhinoglena to accommodate the new species. An identification key to the known species of the genus is provided.
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The influence of environmental variables on freshwater rotifers of the family Brachionidae and Lecanidae in Thailand
- This study investigates the influence of limnological parameters that are known to influence rotifer species richness and composition in temperate areas on two families of monogonont rotifers in a tropical area. We analysed species richness and diversity of the two families from 133 samples taken from several habitat types in Thailand. Coordinates, elevation, pH, temperature, conductivity, salinity and dissolved oxygen were measured and their effect on rotifers assessed. A total of 60 species in 5 genera was recorded from the two families. Latitude and temperature had an effect on species richness of Brachionidae. None of the variables affected species richness of Lecanidae, except habitat type, albeit not significantly. Habitat type and conductivity had an effect on species composition of the two families, whereas latitude had an effect only on species composition of Lecanidae. Species richness and composition of the two rotifer families are well documented in Thailand and no or only few additional species are expected. The limnological correlates of rotifer diversity seem to be in part comparable to and in part different from those known from temperate areas, suggesting that there may be general trends in rotifer species richness and composition across different latitudes.
