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Techreport Reference Turbine size impacts the number of seabird collisions per installed megawatt and offers possibilities for mitigation.
As the offshore wind energy technology is rapidly progressing and because wind turbines at sea have a relatively short life span, repowering scenarios are already being discussed for the oldest wind farms. Ongoing developments result in larger wind turbines and an increased open airspace between turbines. Despite taller towers having larger rotor swept zones and therefore a higher collision risk area compared to smaller-sized turbines, there is increasing evidence that fewer but larger, more power-efficient turbines may have a lower collision rate per installed megawatt. As such, turbine size can offer an opportunity to mitigate seabird fatalities by increasing the clearance below the lower rotor tip. We assessed the seabird collision risk for a hypothetical repowering scenario of the first offshore wind farm zone in Belgian waters with larger turbines and the effect of an additional increase in hub height on that theoretical collision risk. For all species included in this exercise, the estimated collision risk decreased in a repowering scenario with 15 MW turbines (40.4% reduction on average) because of higher clearance between the lower tip of the turbine rotor and the sea level, and the need for a lower number of turbines per km². Increasing the hub height of those 15 MW turbines with 10 m, further decreases the expected number of seabird collisions with another 37% on average. However, terrestrial birds and bats also migrate at sea and the effect of larger turbines on these taxa is less clear. Possibly even more terrestrial birds and bats are at risk of collision compared to the current turbines. So, while larger turbines and increasing the hub height can be beneficial for seabirds, this likely needs to be applied in combination with curtailment strategies, which stop the turbines during heavy migration events, to reduce the impact on other species groups.
Located in Library / RBINS Staff Publications 2022
Article Reference Biofluorescence of the Mottled shovel-nosed frog, Hemisus marmoratus: first report for Hemisotidae.
Located in Library / RBINS Staff Publications 2023
Article Reference First outdoor record of Crematogaster scutellaris (Olivier, 1792) in Belgium (Hymenoptera: Formicidae)
We report the first observation of an outdoor nest of the ant species Crematogaster scutellaris (Olivier, 1792) in Belgium. In spring 2022, a nest of this species was discovered at Rood Klooster in Auderghem, Brussels Capital Region. Large and very active trails of workers were detected in a hedge and along the walls of a small building. The nest is probably already present several years and situated in the wooden construction of the building. Interactions with other ant species indicate that this new arrival will not immediately become an invasive problem for the local native ant fauna. We expect that more records of this species might be discovered in the near future in the neighborhood but also elsewhere in Belgium.
Located in Library / RBINS Staff Publications 2023
Article Reference Soil-litter arthropod communities under pasture land use in southern Rwanda
Land use change caused by human activities is the main driver of biodiversity loss and changes in ecosystem functioning. However, less is known about how the conversion of a natural to pasture land favour the biological diversity of soil-litter arthropods to advance effective conservation plans and management systems. To fill the gap, this study focussed on soil-litter arthropod communities under a pasture land use in southern Rwanda. Data have been collected using pitfall traps and hand collection between April and June 2021. Sampled specimens of soil-litter arthropods have been identified to order and family levels by using dichotomous keys. Further, the species name was given when the identification key was available, while the morphological description was provided in absence of the identification keys. Results indicated a total of 3013 individuals of soil-litter arthropods grouped into 3 classes, 13 orders, 46 families and 87 morpho-species. Coleoptera showed a high number of families, while higher abundance and the number of morpho-species were found for ants (Hymenoptera: Formicidae). Higher abundance of sampled soil-litter arthropods is a sign that the studied area offers suitable habitat for soil-litter arthropods. However, less abundance found for some groups of soil-litter arthropods might be influenced by the used sampling techniques which were not appropriate for them. We recommend surveys using multiple sampling techniques to maximize chances of capturing a wide range of soil-litter arthropods.
Located in Library / RBINS Staff Publications 2022
Article Reference First record of the terrestrial nemertean Geonemertes pelaensis Semper, 1863 (Hoplonemertea: Prosorhochmidae) for Cuba
Located in Library / RBINS Staff Publications 2020
Inbook Reference A Late Period fish deposit at Oxyrhynchus (el-Bahnasa, Egypt)
We describe the abundant faunal remains that were found in an extensive ritual deposit discovered in 2012 at Oxyrhynchus. This site in Middle Egypt has been famous since the first millennium BC for the mormyrid fish that were worshipped there and after which the town was named. The role played by these fish has already been amply documented through textual evidence, bronze statuettes and paintings, but until now, no remains and no mummies of these fish had been found. We first describe the ritual deposit as a whole, with emphasis on its extent, its stratigraphy and its relationship to the surrounding structures, which, together with a very specific artefact, allow the layers to be dated to the Late Period. The fish remains, as well as the sparse mammal bones, are quantified using both number of identified specimens (NISP) and minimum number of individuals (MNI). Body length reconstructions of the mormyrid fish are carried out using newly derived regression equations. Because of the large quantity of material, we performed the taxonomic identifications and size reconstructions on subsamples from which estimates were then made for the total number of fish that may have been present in the entire deposit. Attention was given to the way in which the fish bundles were prepared, a process that involved both the use of textiles and halfa grass, and to how the deposit was organised. We discuss the species spectrum in relation to both the Egyptian fish cult and evidence from written sources. Finally, we attempt to reconstruct the different events that may have taken place between the capture of the fish and their final deposition at the site, using a combination of both zoological/ecological and papyrological evidence.
Located in Library / RBINS Staff Publications 2019
Article Reference A checklist of Lecithoceridae (Lepidoptera: Gelechioidea) of the Afrotropical Region
Located in Library / RBINS Staff Publications 2021
Article Reference The Good, the Bad and the Ugly. Selection of flint nodules, first step of the chaîne opératoire: data from ST6 Neolithic mine (Spiennes, Belgium)
Shaft ST6, exploited during the Middle Neolithic II (4200-3600 BCE), is the last extraction feature of flint excavated according to the most recent planned research at Petit-Spiennes. The objectives of this study are to determine the criteria used by Neolithic miners to select blocks in shaft ST6. It also aims to estimate the impact of flaws in raw material on the selection process (in particular extensional fractures), as well as any variability between the beds mined. Furthermore, the presence of hammer-stones, flakes and some roughouts in the underground mining works raises the question as to whether any knapping was carried out in these levels.
Located in Associated publications / / ANTHROPOLOGICA ET PREHISTORICA / Bibliographic references
Article Reference Accompagner les morts : l’activité de fossoyeur de la Révolution à l’Empire à Reims
A person who acts behind the scenes of funerals, the gravedigger generally suffers from a bad image. Although his role is essential to the proper conduct of funeral practices, his missions and status are poorly known. The municipal and community archives of the city of Reims offer the opportunity to outline the activity of the gravedigger during the post-revolutionary period. Although the available bundles only allow us to understand the activity of the gravediggers over a short period of time, the information they provide constitutes the first milestones of a more global development of a «history of gravediggers».
Located in Associated publications / / ANTHROPOLOGICA ET PREHISTORICA / Bibliographic references
Article Reference Étude ostéologique de deux crémations provenant du site de Postel (Province d’Anvers, âge du Bronze)
Two cremations dating from the Bronze Age were discovered in the 1950s in a burial mound in Postel in the province of Antwerp. The colour of the skeletal remains indicates a homogeneous cremation with a temperature of at least 800°C. The most ancient individual (dated to phase I of the construction of the burial mound) is the most complete: about ¾ of its remains, which belong to all anatomical categories, were transferred from the pyre to the grave. The osteological study reveals that it was probably an adult male who was at least 25 years of age. The second subject is more recent (dated to Phase III) and is thought to have been an individual of undetermined sex, under 20 years old. The smaller quantity of remains and the absence of some anatomical categories, including fragile and small bones, that this was a deliberate sorting made by the cremation officiant. This type of selection has already been seen in other Belgian sites dating from the Bronze Age and later.
Located in Associated publications / / ANTHROPOLOGICA ET PREHISTORICA / Bibliographic references