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Article Reference Des Néandertaliens à la troisième caverne de Goyet (Belgique) et leur gestes mortuaires.
Located in Library / RBINS Staff Publications
Inproceedings Reference Detecting algae blooms in European waters
A near real-time algal bloom detection service has been developed for European waters. Daily chlorophyll a data from Envisat/MERIS and Aqua/MODIS are compared to a predefined threshold map to determine whether an algal bloom has occurred. The design of the threshold map takes account of two factors. Firstly, over European waters regional differences in typical and extreme levels of chlorophyll a span two orders of magnitude. A concentration, e.g. 2 μg/1, that would be considered as a bloom concentration in one region could correspond to a relatively low concentration in another region. Secondly, the errors in satellite chlorophyll a can be significant in coastal waters effectively giving an artificial background level in satellite images. To account for these two factors a threshold map has been designed using satellite chlorophyll a data from a previous year, with separate threshold maps for each sensor to take account of sensor-specific bias. This threshold is defined here as the top 10\% level of a previous year's chlorophyll a data. The results of algal bloom detection in various regions are analysed in terms of bloom timing, duration and strength. Differences between the performance for the MERIS and Aqua sensors are also discussed.
Located in Library / RBINS Staff Publications
Inproceedings Reference Detecting Xenopus laevis in Belgium using eDNA and qPCR
Located in Library / RBINS Staff Publications 2022 OA
Article Reference Detection of invasive and alien land planarians as threats to agriculture and ecosystem stability
Alien land planarians are considered potential threats to European agriculture and ecosystem stability. Severe impact of alien land planarian species in Europe but also worldwide was reported including depletion of local and native soil invertebrates and possible detrimental changes at the ecosystem level. Given the increasing number of studies reporting non-native and potentially invasive species of geoplanid planarians, further action in first response related to worldwide plant trade is called for. To date, the only flatworm on the list of “Invasive Alien Species of European Union Concern” is the New Zealand flatworm Arthurdendyus triangulatus. To help authorities detect and prevent introduction of the New Zealand flatworm, we designed an experiment in order to develop a species-specific barcoding protocol to check possible contamination by A. triangulatus of containerised flowerpots, identified as the most probable source of its co-introduction to non-native region. Based on our results, specific behavior of A. triangulatus staying restricted to the surface and upper layer of the flowerpot determines accessibility of DNA in the soil. Therefore, water-based eDNA methodology combined with a newly established qPCR protocol is preferred as it provides a sensitive approach for detection of A. triangulatus in the flowerpots. Further testing is needed to determine sensitivity of the persistence of eDNA following the flatworm’s removal, to estimate the risk of false positives. The newly designed barcoding protocols provide species-specific diagnosis of one invasive and three non-native land planarians currently being assessed for their invasion risks. However, the species-specificity of the developed barcoding protocols might need to be re-evaluated in case of introduction of new planarian species, and in view of apparent misidentifications regarding published genetic resources. Instead, general protocols requiring genetic sequence analyses would offer a more robust approach to assess species diversity of introduced and potentially invasive land planarians.
Located in Library / RBINS Staff Publications 2024
Proceedings Reference Detection of shipwrecks in ocean colour satellite imagery
Located in Library / RBINS Staff Publications 2016
Proceedings Reference Détermination comparative des Goélands leucophées et pontiques.
Located in Library / RBINS Staff Publications
Inproceedings Reference Determination of manganese oxides of economic and environmental interest by Raman spectroscopy.
Located in Library / RBINS Staff Publications 2016
Inproceedings Reference Detrital paramagnetic (clays) minerals controlling the magnetic susceptibility signal and detection of detrital ferromagnetic minerals during Danian and Selandian time (Loubieng quarry, France).
The abandoned Loubieng quarry located close to Pau (France) encompasses the Danian/Selandian boundary (DSb). The section could be subdivided into three parts:i) the basal part of the section consists mostly of Danian whitish carbonate beds withonly scarce and thin marly layers, ii) several limestone/marl alternations at theuppermost part of the Danian, and iii) the Selandian marls. The transitions between those divisions are linked to the Late Danian Event (LDE) and the DSb interval respectively. The three parts are clearly distinguishable in the low-field magnetic susceptibility curve established on 272 samples collected every 10 cm along the section up to 23 m (including the first three meters of the Selandian) and then every 25 cm in the marls. The low-field magnetic susceptibility (XLF) curve could be subdivided into eight major trends (orange arrows noted from 0 to 7) as highlighted in figure 1. The lithology has clearly an influence on the XLF values as the marls have always higher XLF values compared to the Danian limestones and the Selandian sandstones. Moreover, some specific carbonate beds have very low XLF values, sometimes even negative suggesting a diamagnetic behaviour. Some of these beds clearly corresponds to mass-gravity deposits (probably debris flows) as confirmed by microfacies (thin sections) analysis. To better constrain the XLF fluctuations, hysteresis data have been obtained with a Jcoercivity magnetometer on 55 samples selected along the section including all the different lithologies and the whole range of XLF values. A very strong correlation (r = 0.93) is highlighted between XLF and XHF values suggesting that the paramagnetic particles (i.e. the clay minerals) are clearly controlling the signal. Nevertheless, ferrimagnetic particles are also detected indicating a clear contribution of these minerals on the XLF curve. The magnetic viscosity (Sd), the remanence coercive force (Hcr) and the contribution (\%) to the high-field remanence parameters have generally good correlations between them. These parameters reveal two specific intervals where their values are higher: i) around the LDE in an interval displaying yellowish colours and ii) during the DSb interval characterized by reddish marls and limestones. The behaviour of the remanent magnetization was determined in eight samples during cooling and warming cycles on a MPMS3 – VSM (vibrating sample magnetometer). These analyses confirm the presence of goethite and hematite minerals present essentially during LDE and DSb time interval, respectively. We suggest that the paramagnetic (clay minerals, i.e. illite, kaolinite and smectite) and the ferromagnetic minerals are essentially primary minerals (detrital) deriving probably from extensive soils developed on the surrounding continental areas bordering the marine realm.
Located in Library / RBINS Staff Publications 2016
Inproceedings Reference developing IOT sensors to improve knowledge and safety of the marine and lacustrine waters in Benin
Located in Library / RBINS Staff Publications 2018
Proceedings Reference Development and decease of the so-called Frasnian reefs in the Frasnian of Belgium
Located in Library / RBINS Staff Publications 2017