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Niche stability or lability in Cytherissa lacustris? A test case for ecological uniformitarianism in Ostracoda.
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RBINS Staff Publications 2022
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A freshwater ∆47-ostracod calibration to characterize lacustrine changes at a regional scale: preliminary results
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RBINS Staff Publications 2022
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Introducing the project HabitAnt - Past and future habitability in Antarctic lakes: succession, colonization, extinction, and survival in glacial refugia
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RBINS Staff Publications 2022
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Reaching for new heights: canopy laser scanning in the Peruvian Amazon
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Large trees are vital for the functioning of tropical forests. They house a wide range of organisms, making them true biodiversity hotspots and play a key role in forest biomass storage.The Life On Trees (LOT) project is a research program in which all eukaryotic organisms on individual trees are surveyed, including plants, fungi, animals and protists. One of the goals of the research program is to explore the link between the distribution of the occurring organisms and the tree architecture of those large trees. To accurately quantify the structure of such trees and investigate the interplay between the tree and its surroundings, terrestrial laser scanning is currently used as a state-of-the-art technology. Terrestrial laser scanning (TLS) generally uses a laser scanner to scan trees from multiple viewpoints from the ground. In dense tropical forests, the tree canopy often reaches a height of 50 m or more. Due to the large distance between the scanner and the tree crown, even the best laser scanners have difficulty getting a clear view of the top of the canopy. For those large, colossal trees, data is limited and suffers a lot of occlusion. Since all scans are taken from the ground, data on the upperpart of branches is nonexistent. To assess this limitation of TLS, we explore how much additional 3D information is gained from the tree structure by collecting 3D scans inside the tree crown. With the aid of professional climbers, we lifted a RIEGL vz-400 laser scanner into a Dussia tree in Rio Abiseo National park located in the Peruvian Amazon. The selected tree is quite spectacular, it reaches a height of 50 m and a width of 45 m, and is covered with vegetation including many orchids and epiphytes hosting a wide variety of life forms. The first results of this project will be presented, focusing on the tree architecture with its impressive volume and branch length, and the benefits and challenges of scanning inside the tree crown.
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RBINS Staff Publications 2022
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Biodiversity of eukaryotes in large tropical trees: the Life On Trees (LOT) program
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Introduction: Basic data on biodiversity, such as the variety of life forms coexisting on a single tree, are still lacking and prevent a full understanding of the complexity of interactions among organisms in a tropical rainforest. Filling this gap has recently become more achievable thanks to advances in canopy access methods and genetic tools. Objective: The main aims of the research program Life On Trees (LOT) are to generate baseline knowledge about the number of species a single tropical tree can support and to understand how these communities of organisms are assembled. Methods: Our first project is performed in one of the most biologically diverse regions: the Peruvian Amazon, in the Rio Abiseo National Park. We focus our sampling on a spectacular Dussia tree (Fabaceae), which is 50 m high and 45 m wide and covered with epiphytes. For safety reasons, the sampling is carried out by professional climbers, guided by experts of the different eukaryotic groups studied (plants, fungi, animals, protists). In order to better understand the contribution of different tree components (bark, leaves, fruits, flowers, dead wood) to overall tree biodiversity, we assign observations into communities based on height zone or microhabitat and examine similarities and nestedness in the composition of these communities. The complex architecture of the tree is studied using terrestrial LiDAR and the location of samples is recorded using a high precision differential GPS receiver (dGNSS). The collected specimens will be determined by classical taxonomy and genetic methods (DNA metabarcoding). An online tracking system for those specimens sent to taxonomists for identification, as well as a central database system, are already under development. Results: The first results of the LOT-Peru project from April-May 2022 and of the preliminary tests conducted in October 2021 will be presented. Implications: The scope of this program is not only scientific. Using the simple example of a large tree, we can reach out to the public and explain difficult concepts, such as what biodiversity is and how it is generated and sustained. In addition, the tree is a strong symbol that has an emotional impact. We hope that this program will build awareness about the impacts of deforestation, and conversely the value of conservation, by showing foresters, city dwellers or villagers that when a tree is cut down, a whole range of biodiversity disappears.
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RBINS Staff Publications 2022
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L'occupation de la haute montagne dans les Alpes occidentales. Apport de l'archéologie et des analyses paléoenvironnementales
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RBINS Staff Publications 2018
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Avances en la filogenia y biogeografía de esponjas marinas del Pacífico Sureste
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RBINS Staff Publications 2021
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Latest Cretaceous hadrosauroid (Dinosauria: Ornithopoda) remains from Bulgaria
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RBINS Staff Publications
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First virtual endocasts of two Paleocene arctocyonids: a glimpse into the behavior of early placental mammals after the end-Cretaceous extinction
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Placentals are by far the most diverse group of mammals today, with 6,111 species. They occupy a plethora of ecological niches worldwide and display a broad range of body masses. The vacant niches left by non-avian dinosaurs and other vertebrates after the end-Cretaceous mass extinction provided a crucial opportunity for placentals to diversify; however, intrinsic factors also may have played a role. The general neurosensory organization exhibited by extant mammals has been maintained since the early Mesozoic. Much later, early members of extant placental groups from the Eocene and Oligocene including rodents, primates and artiodactyls—display neurosensory innovations such as a proportionally larger neocortex and higher encephalization quotient compared to their Mesozoic ancestors. However, between these two well-known intervals of mammalian neurosensory evolution, there is a gap: few studies have focused on the brains of the oldest placentals living during the early Paleogene, in the Paleocene. We focus on the ‘Arctocyonidae’, a likely polyphyletic group of ‘condylarths’, including species potentially implicated in the origins of some extant orders. ‘Arctocyonids’ were among the first placentals to diversify after the end-Cretaceous extinction. They have been reconstructed as small-tomedium sized, mainly omnivorous and terrestrial. We obtained cranial and bony labyrinth endocasts for Chriacus baldwini and C. pelvidens from the lower Paleocene of the San Juan Basin, New Mexico, and Arctocyon primaevus from the upper Paleocene of the Paris Basin, France, via high resolution computed tomography. Both share plesiomorphic brain features with previously described early Paleocene mammals. They have small lissencephalic brains with an EQ range of 0.12-0.43 and 0.16-0.31, respectively. The olfactory bulbs and the paraflocculi represent 6% and less than 1% of the total endocranial volume, respectively and the neocortical height ratio represents ~25% of the total endocranial height. Based on cochlear measurements, both taxa had hearing capabilities similar to those of extant wild boars. Agility scores between 2 and 3 were obtained for both taxa, similar to the modern American badger and crab-eating raccoon, suggesting that C. pelvidens and A. primaevus were ambulatory. These results support growing evidence that early placentals had lower EQs and less expanded neocortices compared to Eocene and later taxa, potentially indicating that high intelligence was not key to the placental radiation after the End-Cretaceous extinction. Grant Information: Marie Sklodowska-Curie Actions: Individual Fellowship, European Research Council Starting Grant, National Science Foundation, and Belgian Science Policy Office.
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RBINS Staff Publications 2019
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Paleocene and Eocene bird assemblage from the Southern North Sea Basin
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Numerous bird bones from the Paleocene and early Eocene of the Belgian and Paris basins have been collected by amateur paleontologists. Four bones from the early-middle Selandian of Maret, Belgium are among the earliest Cenozoic avian remains from Europe and include the oldest temporally well constrained records of the Gastornithidae, as well as tentative records of the paleognathous Lithornithidae and the Ralloidea. Another assemblage from the middle Thanetian of Templeuve, France contains multiple bones of the Lithornithidae as well as a record of the Pelagornithidae. Specimens from the latest Thanetian of Rivecourt-Petit Pâtis, France are tentatively assigned to the Ralloidea and Leptosomiformes. An assemblage of 54 bones from the middle Ypresian of Egem, Belgium represents at least 20 species in more than 11 higher-level taxa. Well-identifiable specimens are assigned to the Odontopterygiformes, Galliformes, Messelornithidae, Apodiformes, Halcyornithidae, Leptosomiformes, and Coraciiformes. Further specimens are tentatively referred to the phaethontiform Prophaethontidae and to the Accipitridae, Masillaraptoridae, and Alcediniformes. These three-dimensionally preserved fossils provide new data on the osteology of taxa that are otherwise mainly known from compression fossils with crushed bones. They also further knowledge of the composition of early Paleogene avifaunas of the North Sea Basin. Paleocene avifaunas of Europe and North America appear to have had different compositions and only a few taxa, such as the paleognathous Lithornithidae, are known from both continents. This suggests that the very similar early Eocene avifaunas of Europe and North America are the result of early Cenozoic dispersal events. The well-represented small galliform species from Egem most closely resembles Argillipes aurorum, an ignored galliform species from the London Clay. The tentatively identified fossils of Accipitridae and Alcediniformes would represent the earliest fossil records of these clades. The birds from Egem include few seabirds (Odontopterygiformes, cf. Prophaethontidae) and is dominated by terrestrial species (Galliformes, Messelornithidae). Arboreal birds (Halcyornithidae, Leptosomiformes, cf. Alcediniformes, Coraciiformes) are less abundant and aerial insectivores (Apodiformes) very scarce, which either indicates a taphonomic bias in the composition of the avifauna or particular paleoenvironmental characteristics of the nearshore habitats in that area of the southern North Sea Basin. Grant Information: Funded by Belgian Science Policy Office (project BR/121/A3/PalEurAfrica).
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RBINS Staff Publications 2019
