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A Tale of Three Oceans — Taxonomy of the Holothuria (Thymiosycia) arenicola Semper, 1868 complex (Echinodermata: Holoturoidea: Holothuriidae)
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The ubiquitous sea cucumber Holothuria (Thymiosycia) arenicola Semper, 1868, externally characterized by a double row of dark blotches of various sizes on its dorsal body wall and a cryptic behaviour, is generally assumed to have a wide tropical distribution, although it has not been reported from the Eastern tlantic. Careful morphological examination, with emphasis on the ossicle assemblage, of type and non-type H. arenicola specimens sampled in the Indian, Pacific and tlantic Ocean, its subjective synonyms and species with a similar colouration and habit, revealed that H. arenicola is often confused with other species. This paper formally separates the different species in the H. arenicola complex, one of them being a species new to science: Holothuria (Thymiosycia) kerriensis sp. nov. dditionally, we describe two other species that are often confused with H. arenicola: Holothuria (Lessonothuria) gracilis Semper, 1868 and H. (Thymiosycia) strigosa Selenka, 1867. The H. arenicola complex per se is keyed-out, with the ossicle assemblage of the musculature being recognised as an important, previously largely neglected, guide. This contribution highlights the importance of building and curating well-maintaned natural history collections to understand biodiversity through time and space.
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RBINS Staff Publications 2024
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Sensitivity analysis of the dark spectrum fitting atmospheric correction for metre- and decametre-scale satellite imagery using autonomous hyperspectral radiometry
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The performance of the dark spectrum fitting (DSF) atmospheric correction algorithm is evaluated using matchups between metre- and decametre-scale satellite imagery as processed with ACOLITE and measurements from autonomous PANTHYR hyperspectral radiometer systems deployed in the Adriatic and North Sea. Imagery from the operational land imager (OLI) on Landsat 8, the multispectral instrument (MSI) on Sentinel-2 A and B, and the PlanetScope CubeSat constellation was processed for both sites using a fixed atmospheric path reflectance in a small region of interest around the system&\#x2019;s deployment location, using a number of processing settings, including a new sky reflectance correction. The mean absolute relative differences (MARD) between in situ and satellite measured reflectances reach <20&\#x0025; in the Blue and 11&\#x0025; in the Green bands around 490 and 560 nm for the best performing configuration for MSI and OLI. Higher relative errors are found for the shortest Blue bands around 440 nm (30&\#x2013;100&\#x0025; MARD), and in the Red-Edge and near-infrared bands (35&\#x2013;100&\#x0025; MARD), largely influenced by the lower absolute data range in the observations. Root mean squared differences (RMSD) increase from 0.005 in the NIR to about 0.015&\#x2013;0.020 in the Blue band, consistent with increasing atmospheric path reflectance. Validation of the Red-Edge and NIR bands on Sentinel-2 is presented, as well as for the first time, the Panchromatic band (17&\#x2013;26&\#x0025; MARD) on Landsat 8, and the derived Orange contra-band (8&\#x2013;33&\#x0025; MARD for waters in the algorithm domain, and around 40&\#x2013;80&\#x0025; MARD overall). For Sentinel-2, excluding the SWIR bands from the DSF gave better performances, likely due to calibration issues of MSI at longer wavelengths. Excluding the SWIR on Landsat 8 gave good performance as well, indicating robustness of the DSF to the available band set. The DSF performance was found to be rather insensitive to (1) the wavelength spacing in the lookup tables used for the atmospheric correction, (2) the use of default or ancillary information on gas concentration and atmospheric pressure, and (3) the size of the ROI over which the path reflectance is estimated. The performance of the PlanetScope constellation is found to be similar to previously published results, with the standard DSF giving the best results in the visible bands in terms of MARD (24&\#x2013;40&\#x0025; overall, and 18&\#x2013;29&\#x0025; for the turbid site). The new sky reflectance correction gave mixed results, although it reduced the mean biases for certain configurations and improved results for the processing excluding the SWIR bands, giving lower RMSD and MARD especially at longer wavelengths (>600 nm). The results presented in this article should serve as guidelines for general use of ACOLITE and the DSF.
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RBINS Staff Publications 2020
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Combined land surface emissivity and temperature estimation from Landsat 8 OLI and TIRS
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Remote sensing of Land Surface Temperature (LST) generally requires atmospheric parameters and the emissivity (∊) of the target to be estimated. The atmospheric up- and downwelling radiances and transmittance can be accurately modelled using radiative transfer models and profiles of relative humidity and temperature, either measured by radiosonde probes or retrieved from assimilating weather models. The estimation of ∊ is a large source of uncertainty in the resulting LST product, and there are various approaches using multi-angle observations, multispectral optical or multispectral thermal infrared imagery. In this paper, the estimation of LST from the Thermal InfraRed Sensor (TIRS) on board Landsat 8 is evaluated using more than 6 years of in situ temperature measurements from a network of 14 Autonomous Weather Stations (AWS) in Belgium. ∊ is estimated from concomitant atmospherically corrected imagery from the Operational Land Imager (OLI) using two new neural network approaches trained on ECOSTRESS spectra, and an established NDVI based method. Results are compared to using ∊=1 and the ASTER Global Emissivity Dataset. LST retrievals from L8/TIRS perform well for all emissivity data sources for 500 matchups with AWS subsoil temperature measurements: Mean Differences 0.8–3.7 K and unbiased Root Mean Squared Differences of 2.9–3.5 K for both B10 and B11. The use of unity emissivity gives the best results in terms of MD (0.8 K) and unb-RMSD (3 K). Similar ranges of unb-RMSD are found for 500 matchups with broadband radiometer temperatures (2.6–3.1 K), that have lower absolute MD values (−2.2–0.6 K). For the radiometer temperatures, both the neural net approaches gave lowest MD, in the best case ±0.1 K. The present investigation can hence recommend the neural nets to derive ∊ for the retrieval of LST over the AWS in Belgium. Using published matchup results from other authors however, no single source of ∊ data performed better than ∊=1, but this could be due to their low number of matchups. Further efforts for estimating representative pixel average emissivities are needed, and establishing a denser in situ measurement network over varied land use, with rather homogeneous land cover within a TIRS pixel, may aid further validation of a per pixel and per scene ∊ estimates from multispectral imagery. AWS data seems valuable for evaluation of satellite LST, with the advantage of a much lower cost and higher potential matchup density compared to conventional radiometers.
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RBINS Staff Publications 2020
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Automated water surface temperature retrieval from Landsat 8/TIRS
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Satellite remote sensing of Land and Water Surface Temperature (L/WST) has many applications in studies of terrestrial and aquatic ecology. Retrieval of L/WST requires a well calibrated radiometer and an accurate atmospheric correction. In the present study, the performance of the Thermal InfraRed Sensor (TIRS) on board Landsat 8 is evaluated for the retrieval of L/WST. libRadtran is used to retrieve atmospheric correction parameters based on atmospheric profiles of relative humidity and temperature from three global atmospheric models. Performance of single band retrievals is compared to typical MODTRAN results from the Atmospheric Correction Parameter Calculator (ACPC) and a split-window approach. A multi-temporal land masking method using imagery from the Operational Land Imager (OLI) on board Landsat 8 is demonstrated, and is used to automatically classify imagery in the matchup dataset in three classes of cloud cover. Two sources of in situ data covering the Belgian Coastal Zone (BCZ) are used for validation of the L/WST product: (1) fixed locations in the Flemish Banks measurement network and (2) underway data from regular RV Belgica campaigns. In the present study the single band methods outperformed the split-window approach, and consistent retrievals are found for the MODTRAN and libRadtran simulations. Typical single band surface temperature retrievals in quasi cloud-free conditions have Root Mean Squared Differences (RMSD) of 0.7 K and 1 K for Bands 10 and 11 with low bias, depending on the method and atmospheric profile source. For imagery with scattered clouds, RMSD values increase to 1 K and 2 K respectively with an approximately 0.5 K cold bias, likely caused by cloud proximity. The calibration efforts combined into Collection 1 allows for accurate absolute surface temperature retrievals from B10 on Landsat 8/TIRS for homogeneous targets with known emissivity, such as liquid water. The method is adapted to global processing and can be used for Land Surface Temperature retrieval with a suitable source of emissivity data.
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RBINS Staff Publications 2020
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Een blik op de laatmiddeleeuwse voedselvoorziening van de Abdij van Park (Heverlee, Vlaams-Brabant) op basis van archeozoölogische en historische informatie
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In this article, we describe the faunal remains found in a 15th-/first half-16th-century deposit from the kitchen of Park Abbey, a Norbertine abbey that owned large farms and estates since the 12th century. The bone material, combined with information from the abbey’s archives allows documenting the provisioning of animal food. Except for the marine fish, that was bought at the markets of Leuven and Mechelen, all food was obtained from the abbey itself or from the farms on its territory. Small game, i.e. hare and rabbit, captured in the warrant the abbey owned, was only occasionally served. As for poultry, chicken, goose, duck and pigeon were found among the food waste, species that, according to the historical accounts, were kept for some time in the kitchen in braided bird cages or baskets before being slaughtered there. Where the slaughtering of the traditional domestic animals (cattle, sheep and pigs) took place is not so clear and their exact origin is not known either but the abbey owned several farms where animal husbandry was practised. As might be expected at an abbey site, the proportion of fish is very high and, unlike urban or most noble contexts in Flanders, freshwater fish strongly predominated. This can be explained by the exploitation of ponds in which different species were kept, judging from the accounts in the archives. Curiously, only remains of carp were found in the kitchen and not of the other species mentioned in the accounts such as bream or other Cyprinidae described as ‘whitefish’ such as roach, rudd or bleak. Pike, described as a more expensive fish that was sometimes specially bought for the abbot, is also completely absent. However, all these species were found in Ename Abbey. Archaeozoological and historical information from French and British sites, for example, also illustrate the importance of these species. For marine fishes, there is good agreement between the relative importance of the species in the archaeozoological material, the number of times those fishes were mentioned in the accounts and the total cost spent on them. Thus, the high proportion of cod in the food waste is striking, and the importance of this group is also evident from the accounts in which stockfish, abberdaan and fresh cod account for about 80% of expenditure on marine fish. The bone material from the kitchen contains no traces of stockfish, and there is apparently also relatively little fresh cod (the smaller specimens from the southern North Sea). Most cod remains appear to be from abberdaan, the salted form that was traded whole, with head, as opposed to dried stockfish without head. Poultry was apparently not considered meat in monasteries, but the fact that quite a lot of mammalian remains were found in the food waste of Park Abbey shows that the abstinence of meat was not very strict and that Augustine’s rule was apparently interpreted quite moderately. What is noticeable, however, is that both the cattle and sheep remains contain a lot of bone material from body parts that are not very fleshy (phalanges and cannon bones, respectively) and may have served rather for cooking a soup or broth. Skeletal elements of body parts with a lot of meat on them are less common.
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RBINS Staff Publications 2025 OA
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DNA taxonomy reveals high species diversity among the stygobiont genus Metastenasellus (Crustacea, Isopoda) in African groundwater
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RBINS Staff Publications 2023
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Étude des restes humains d’Atifu, un “guerrier” samoan décédé en Belgique au XIXe siècle
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Cette présentation s’intègre dans le projet HOME (Human Remains Origin(s) Multidisciplinary Evaluation) dont le but est de donner un cadre juridique aux collections de restes humains de Belgique et de standardiser les mesures à prendre en cas de demande de rapatriement. Nous avons réalisé l’étude des restes d’Atifu, “guerrier” de l’île Tutuila (Samoa) décédé à Bruxelles en avril 1890 et autopsié par Émile Houzé (membre fondateur de la société d’anthropologie de Bruxelles). Ce Samoan, après un séjour aux États-Unis d’août à octobre 1889, était arrivé en Europe avec huit de ses compatriotes et devait retourner chez lui trois ans plus tard. Houzé avait eu l’occasion de les examiner lors de leur passage au musée Castan à Bruxelles. Dans sa publication reprenant leur examen anthropométrique détaillé, il donne la cause de décès d’Atifu (la rougeole) et mentionne qu’il était également atteint de tuberculose. Les vestiges anthropologiques d’Atifu consistent en un squelette presque complet et une partie de sa peau (depuis la ceinture jusqu’aux genoux). Celle-ci fut prélevée en raison des tatouages qu’elle présentait et fut naturalisée. L’étude anthropologique confirme que le squelette appartient bien à un individu masculin de plus d’1,70 m et d’origine polynésienne. Notre analyse met également en évidence une fracture guérie du premier métacarpien gauche et une asymétrie marquée des clavicules. Nous n’avons toutefois observé aucun signe osseux de tuberculose. Un modèle 3D de la partie naturalisée a été réalisé en lumière blanche ainsi qu’en lumière infrarouge. L’utilisation de la lumière infrarouge a pour but d’apporter un regard nouveau sur les tatouages. Outre l’intérêt anthropologique généré par une telle étude, elle prend une dimension toute particulière lorsqu’elle est remise en contexte des “zoos humains” et de la poignante histoire de ces individus déplacés pour assouvir la curiosité d’un public en quête d’exotisme.
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RBINS Staff Publications 2022
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Revalidation of Enteromius alberti and presence of Enteromius cf. mimus (Cypriniformes: Cyprinidae) in the Lake Edward system, East Africa
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RBINS Staff Publications 2020
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Unravelling the evolution of Africa’s drainage basins through a widespread freshwater fish, the African sharptooth catfish Clarias gariepinus
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RBINS Staff Publications 2020
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Phylogenomic Characterization of Lopma Virus and Praja Virus, Two Novel Rodent-Borne Arteriviruses
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RBINS Staff Publications 2021 OA
