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Spectral variations of light scattering by marine particles in coastal waters, from visible to near infrared
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Field measurements and Mie calculations of the particulate light-scattering coefficient (b(p), in m(-1)) in the near-infrared and visible spectral domains are combined to quantify and model the effect of particulate absorption on the b(p) spectral variations. The case of particles of coastal origin and assumed to follow a Junge-type size distribution is considered. A simple power-law function closely reproduces the near-infrared b(p) spectral variations, with a spectral slope varying in the range 0.1-1.4. In the visible (e.g., 440 nm), particulate absorption effects systematically lead to b(p) values 5-30\% lower than values predicted using a power-law function fitted in the near infrared and extrapolated to 440 nm. The respective influences of the particle size distribution and composition are investigated for both mineral and organic particle populations. Finally, an empirical model derived from theoretical calculations closely reproduces the actual b(p) spectral variations from near-infrared to short visible wavelengths, taking into account particulate absorption effects.
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RBINS Staff Publications
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Speleothem records over the penultimate deglaciation and the Last Interglacial.
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RBINS Staff Publications
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Speleothem science - A short review and state of the art - in press
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RBINS Staff Publications 2021
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Speleothem-based chronology and environmental context of deposits from the Mishin Kamik Cave, NW Bulgaria–A contribution to the archaeological study of the Late Pleistocene human occupation in the Balkans
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RBINS Staff Publications 2021
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Sphaeroptica: A tool for pseudo-3D visualization and 3D measurements on arthropods
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Natural history collections are invaluable reference collections. Digitizing these collections is a transformative process that improves the accessibility, preservation, and exploitation of specimens and associated data in the long term. Arthropods make up the majority of zoolog- ical collections. However, arthropods are small, have detailed color textures and share small, complex and shiny structures, which poses a challenge to conventional digitization methods. Sphaeroptica is a multi-images viewer that uses a sphere of oriented images. It allows the visualization of insects including their tiniest features, the positioning of land- marks, and the extraction of 3D coordinates for measuring linear distances or for use in geo- metric morphometrics analysis. The quantitative comparisons show that the measures obtained with Sphaeroptica are similar to the measurements derived from 3D μCT models with an average difference inferior to 1%, while featuring the high resolution of color stacked pictures with all details like setae, chaetae, scales, and other small and/or complex struc- tures. Shaeroptica was developed for the digitization of small arthropods but it can be used with any sphere of aligned images resulting from the digitization of objects or specimens with complex surface and shining, black, or translucent texture which cannot easily be digi- tized using structured light scanner or Structure-from-Motion (SfM) photogrammetry.
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RBINS Staff Publications 2024
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Spider Stowaways: molecular Data Support the Synonymization of Selenops galapagoensis with Selenops mexicanus (Araneae: Selenopidae) and Indicate Human-Mediated Introduction to the Galapagos Islands
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RBINS Staff Publications 2016
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Spiders in Galapagos – diversity, biogeography and origin
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RBINS Staff Publications 2020
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Spiniferaphonte, a new genus of Laophontidae (Copepoda: Harpacticoida), with notes on the occurrence of processes on the caudal rami
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A new genus and species of Laophontidae, Spiniferaphonte ornata n. gen., n. sp., is described from the coast of Kenya. The new genus is closely related to Laophontina and Wellsiphontina as shown by the following synapomorphies: a denticulate operculum, a sexually dimorphic P4 exopod (reduced chaetotaxy of the ultimate segment in the male), and the absence of sexual dimorphism in the P2 and P3 endopods. The two-segmented exopod of P1 and the presence of a seta on the endopodal part of the male P5 are plesiomorphies indicating that the new genus represents a separate lineage within this group. The proposal of the new genus Spiniferaphonte is supported by the following autapomorphies: three smooth setae on the female P5 exopod and a robust, dorsally bent, and strongly sclerotised caudal seta V. Within the Laophontidae, it is striking that the presence of distinct, thorn-like processes on the caudal rami is limited to interstitial genera. Distinct processes on the proximal segments of the antennule and a proximally thickened caudal seta V also appear to be associated with this interstitiality. These structures may play a role in the movement and the anchoring of the animals in their interstitial habitat.
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RBINS Staff Publications
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Spinnen en loopkevers ingezameld tijdens een korte bodemvalbemonstering te Doeveren (Zedelgem‐Oostkamp)
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Spiders and carabid beetles were collected with pitfall traps during a short sampling campaign in the spring of 2017 (from 24/05 to 11/07) in the nature reserve Doeveren at Zedelgem‐Oostkamp. 49 species of spiders and 34 species of carabid beetles were found. We here discuss some particular species of both arthropod groups that are mentioned as threatened on the Red list for Flanders. We comment the management and heathland restoration measures of the last years and its impact on both faunas
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RBINS Staff Publications 2019
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Spondylosis deformans in three large canids from the Gravettian Předmostí site: Comparison with other canid populations
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RBINS Staff Publications 2016
